A7 Application Guide

MODEL A7
Application Guide
VISIT US AT
WWW
.WILFLEY.COM
7350 E. Progress Place • Englewood, CO USA 80111 • Toll Free: 800.525.9930 • Phone: 303.779.1777 • Fax: 303.779.1277
A2648 rev-
TABLE OF CONTENTS
PUMP SELECTION GUIDE................................. 1
INFORMATION REQUIRED FOR PUMP
SELECTION ..................................................... 1
SELECTING THE PUMP SIZE ........................ 1
MOTOR HORSEPOWER SIZING .................... 2
SEAL POWER CONSUMPTION...................... 2
SECONDARY EXPELLER
HORSEPOWER CONSUMPTION ................ 2
MECHANICAL SEAL HORSEPOWER
CONSUMPTION (HP) ................................... 3
PUMP SHAFT POWER LIMITS ....................... 3
®
®
DRYLOCK FOR LIGHT SLURRY SERVICES
(TYPE C) ........................................................ 21
®
DRYLOCK WITH PACKING BACKUP
(TYPE F) ......................................................... 21
®
DRYLOCK WITH PACKING BACKUP
(TYPE G) ........................................................ 22
WILFLEY DIAPHRAGM (TYPE H) ................. 22
PACKING (TYPE E & D) ................................ 23
MECHANICAL SEALS ................................... 24
RECOMMENDATIONS FOR DIFFICULT
PUMPAGE ...................................................... 24
DRYLOCK ACTUATOR BALLS .................. 4
BACKUP SEALS ............................................ 25
SUCTION HEAD LIMITS – A7 FRAME 1......... 5
IMPELLER ......................................................... 26
SUCTION HEAD LIMITS – A7 FRAME 2......... 6
IMPELLER STANDARD CONFIGURATION.. 26
SUCTION HEAD LIMITS – A7 FRAME 3......... 7
STANDARD IMPELLER DIAMETER ............. 26
SUCTION HEAD LIMITS – A7 FRAME 4......... 8
CONTINUOUS OPERATING RANGE ............. 9
IMPELLERS WITH BALANCE HOLES vs.
IMPELLER WITHOUT HOLES: ...................... 26
MIN. CONTINUOUS THERMAL FLOW ........... 9
IMPELLER BALANCING CRITERIA .............. 26
GENERAL RECOMMENDATIONS FOR
MINIMUM CONTINUOUS FLOW ................... 10
IMPELLER CLEARANCES (INCHES) ........... 27
SECONDARY EXPELLER ................................ 27
A7 SOLIDS HANDLING GUIDELINES .......... 11
MATERIAL SELECTION GUIDE ....................... 28
CORRECTION OF PUMP PERFORMANCE
FOR VISCOUS LIQUID .................................. 12
MATERIALS OF CONSTRUCTION .................. 28
EFFICIENCY .................................................. 12
NPSHA ............................................................ 12
MATERIAL SELECTION FOR NORMAL pH
AND CHLORIDE OPERATION LEVELS ....... 29
AIR INGRESS ................................................ 12
CHEMICAL COMPATIBILITY......................... 29
DYNAMIC SHAFT DEFLECTION AT
MAXIMUM HYDRAULIC LOAD ..................... 13
CASING AND FLANGES MATERIALS .......... 29
SHAFT FLEXIBILITY RATIO .......................... 13
pH VALUES .................................................... 28
CLASS 150 FLANGES: PRESSURE –
TEMPERATURE RATINGS ........................... 30
SEAL SELECTION GUIDE ................................ 15
CLASS 300 FLANGES: PRESSURE –
TEMPERATURE RATINGS ........................... 30
SEAL CONFIGURATIONS ............................. 15
BEARING GUIDE .............................................. 31
SEAL CONSTRUCTION ................................ 16
BEARING SELECTION .................................. 31
STANDARD PUMP DEFINITION ................... 14
®
DRYLOCK SEALS – DESCRIPTION AND
DRAWINGS ....................................................... 17
®
DRYLOCK SEAL ASSEMBLY ...................... 18
®
STANDARD DRYLOCK SEAL (TYPE A) ..... 19
®
DRYLOCK WITH LUBE SEAL BACKUP
(TYPE A) ........................................................ 20
OUTBOARD BEARINGS ............................ 31
INBOARD BEARINGS: ............................... 31
PUMP INSTALLATION ...................................... 41
DRIVES AND BASES ..................................... 41
SUCTION PIPING.............................................. 46
DISCHARGE PIPING ........................................ 46
®
HI-TEMPERATURE DRYLOCK
(TYPE B) ........................................................ 20
7350 E. Progress Place • Englewood, CO USA 80111 • Toll Free: 800.525.9930 • Phone: 303.779.1777 • Fax: 303.779.1277
A2648 rev-
PUMP SELECTION GUIDE
INFORMATION REQUIRED FOR PUMP SELECTION
•
•
•
•
•
•
•
Liquid to be handled: name, temperature, specific gravity, vapor pressure, density, viscosity, if
crystallization occurs or not, pH, percent acid.
Information on solids if present: % solids by weight, mesh analysis, apparent viscosity, maximum size,
shape, how abrasive are the solids.
Pump requirements:
o Capacity required (rated, normal, minimum, maximum), suction pressure range, discharge
pressure (H), NPSH available (NPSHA). A complete system curve should be developed
o Special requirements (steam jacket, heat tracing, etc.), special system requirements (multiple
operation range, flushing, etc.)
o Suction and discharge pipe size.
Electric source and motor construction (AC, DC, Volts, Phase, Cycles).
Operation parameters (continuous, intermittent, etc.), variable speed (max., min., startup)
Materials of construction: alloys and elastomers.
Fully completed Data Sheet.
SELECTING THE PUMP SIZE
Step 1.
Given the flow (Q) and head (H), turn to the performance composite envelope chart and select
the model that best fits these conditions, then turn to the particular pump curve and check to
verify that the flow and head can be satisfied. The rating point should fall to the right of the
lowest efficiency shown and to the left of BEP.
Step 2.
For the required flow, find the size of the impeller that will satisfy the head requirement. Round
up the impeller diameter to the closest size in 1/8” increments. Check that the operating
conditions fit within the preferred operating range. (See Section titled “Continuous Operating
Range”)
Step 3.
From the ”Suction Pressure Limits” curves determine the diameter of the secondary expeller that
will handle the expected range of suction pressure. Select a standard size expeller. If the
maximum expeller diameter will not hold the suction pressure, consider the following:
• increase speed and trim the impeller
• select another pump
Step 4.
After selecting the secondary expeller diameter, verify the standard bearing life for the selected
parameters (Check the nomogrames in the “Bearing Selection” chapter). If the standard bearing
is not adequate, consider the following solutions:
•
increase speed and trim the impeller and the secondary expeller diameter to match the
suction pressure range
• select the extreme duty series
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1
MOTOR HORSEPOWER SIZING
Required motor horsepower:
•
•
Use BHP at runout flow to ensure that the motor is not overloaded.
If flow conditions will not exceed duty flow, use BHP at duty flow.
This power has to be corrected for seal power consumption:
HP = Hp + Sp
Sp = Seal power consumption (See the charts for: secondary expeller, mechanical seal, etc.)
Correct HP for specific gravity of the pump fluid if S.G. is different than 1.0.
For S.G. > 1.9 consult factory.
Minimum motor HP:
1.1 = Safety Factor
HP=Safety Factor x S.G. x (BHP from curve + Sp)
If S.G. is < 1, check startup conditions at plant. System may be tested on water and full-size motors would be
required.
SEAL POWER CONSUMPTION
SECONDARY EXPELLER HORSEPOWER CONSUMPTION
2
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MECHANICAL SEAL HORSEPOWER CONSUMPTION (HP)
RPM
3550
1750
1450
1150
SINGLE TANDEM
1.750 INCH
.10
.26
.05
.13
.04
.11
.03
.08
SINGLE TANDEM
2.500 INCH
.22
.54
.11
.27
.09
.22
.07
.18
PUMP SHAFT POWER LIMITS
FRAME 1
Hp per
100 RPM
1.5
FRAME 2
(Notes 1 & 2)
2.8 (except 4x3-10)
2.7 (4X3-10)
3.5 (4X3-10 high power option)
FRAME 3
FRAME 4
5.5
14.5
1. High horsepower shaft option is available for the 4X3-10 only.
2. Maximum allowable motor size for the use with frame 2 pumps, except 4X3-10 is 100 Hp at 3550 rpm.
The maximum allowable motor size for use with the 4X3-10 with standard shaft at 3550 rpm is 75 Hp.
The maximum allowable motor size for use with the 4X3-10 with the optional high power shaft at 3550
rpm is 125 Hp.
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3
ACTUATOR BALLS
•
The seal opening and closing speed in relation to the number of balls in the actuator:
DRYLOCK® ACTUATOR BALLS
The number of bearing balls to be used will be determined by the sales person for a specific application.
•
®
Number of 5/8” diameter bearing balls to be employed in the DryLock assembly related to speed and
Pump Frame:
FRAME NO
1
2
3
4
4
1450 RPM
9
9
18
18
1750 RPM
9
9
9
9
3550 RPM
3
3
3
-
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SUCTION HEAD LIMITS – A7 FRAME 1
Pump Series
by Impeller
Diameter
6”
Pump Size
Expeller Diameter
7”
1.5 x 1 - 6
YES
3 x 1.5 - 6
YES
8”
1.5 x 1- 8
YES
Refer to individual performance curves for maximum and minimum impeller diameters.
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5
SUCTION HEAD LIMITS – A7 FRAME 2
Expeller Diameter
10”
8”
7”
3 x 1.5 - 8
YES YES
8”
3x2-8
YES YES
4x3-8
YES YES
2 x 1 -10
YES YES YES
3 x 1.5 - 10 YES YES YES
10”
3 x 2 - 10
YES YES YES
4 x 3 - 10
YES YES YES
6 x 4 - 10
YES YES YES
Refer to individual performance curves for maximum and minimum impeller diameters.
Pump Series by
Impeller Diameter
6
Pump Size
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SUCTION HEAD LIMITS – A7 FRAME 3
Pump Series
by Impeller
Diameter
13”
Pump Size
Expeller Diameter
10”
12”
3 x 1.5 - 13
YES
YES
3 x 2 - 13
YES
YES
4 x 3 - 13
YES
YES
6 x 4 - 13
YES
YES
Refer to individual performance curves for maximum and minimum impeller diameters.
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7
SUCTION HEAD LIMITS – A7 FRAME 4
8
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CONTINUOUS OPERATING RANGE
The recommended continuous operating range represents the range in which the pump can always be
applied, with the exception of low specific gravity.
Operation outside of the recommended range may be possible depending on the operating parameters and
service. This requires evaluation of the temperature rise, NPSHA, intermittent operation.
The maximum flow is defined as 1.1 x QBEP at the rated diameter and applications beyond this flow must be
referred to the factory. Although the pumps can run dry, when fluid is present in the case, a minimum flow
must be provided. The minimum allowable flow for a specific application will be the larger of either the
general recommendations (see chart below) or the thermal flow.
MINIMUM CONTINUOUS THERMAL FLOW
The minimum continuous thermal flow must be considered if any one or more of the following conditions
exists:
•
•
•
•
•
The suction pressure is approximately equal to the vapor pressure of the pumped media.
A high suction pressure exists at relatively low pumping temperature.
The NPSHA is close to NPSHR.
The specific gravity of the pumped media is at or below 0.65.
The vapor pressure of the pumped media increases rapidly with a small temperature increase.
Procedure:
1. Obtain data on the specific gravity, vapor pressure and specific heat for the fluid over the range of the
0
pumping temperature to 15 F above pumping temperature.
2. Calculate the absolute pressure at the pump suction nozzle.
3. Deduct NPSHR from the absolute suction pressure.
4. From the vapor pressure data, determine the saturation temperature that corresponds to the resultant
pressure from Step 3.
5. Subtract the pumping temperature from the saturation temperature from Step 4; this is the allowable
temperature rise.
6. Determine the pump BHP at or near shutoff.
7. Calculate the minimum thermal flow using the following equation:
𝑄=
5.09 × 𝐻𝑃
𝑇 × 𝑆. 𝐺.× 𝑆. 𝐻.
Where:
Q=
HP =
T=
S.G. =
S.H. =
A2648 rev-
Minimum Continuous Thermal Flow in GPM.
Horsepower at or near shutoff.
Allowable temperature rise based on service
Specific gravity of the pumped fluid.
Specific heat of the pumped fluid
9
GENERAL RECOMMENDATIONS FOR MINIMUM CONTINUOUS FLOW
PUMP
10
SIZE
DESIGNATION
1.5x1-6
3x1.5
1.5x1-8
3x1.5-8
3x2-8
4x3-8
2x1-10
3x1.5-10
3x2-10
4x3-10
6x4-10
3x1.5-13
3x2-13
4x3-13
6x4-13
8x6-15
10x8-15
8x6-16S
10x8-16S
AA-6
AB-6
AA-8
A50-8
A60-8
A70-8
A05-10
A50-10
A60-10
A70-10
A80-10
A20-13
A30-13
A40-13
A80-13
A110-15
A120-15
% BEP
@ 3550/2900 @ 1750 /1450
RPM 60/50 Hz RPM 60/50 Hz
15
10
15
10
20
10
20
10
20
10
20
10
25
10
25
10
30
15
30
15
30
15
30
15
40
15
40
40
40
50
50
55
60
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A7 SOLIDS HANDLING GUIDELINES
In selecting A7 pumps in solids handling applications, it is prudent to adjust the allowable parameters in
which the pump can operate to insure satisfactory performance. The A7 family of pumps covers the following
ranges for solids handling classified by the specific gravity of the pumpage and the average particle size of
the solids in the pumpage.
Notes:
1. This chart is not applicable if there are no solids present in the pumpage regardless of the specific
gravity of the pumpage.
2. This chart is based on abrasive solids such as silica sand. If the application exceeds the limits below
and the solids are not as abrasive as sand, contact Engineering for further evaluation.
The following table gives maximum values for those parameters that should be adjusted when applying an
A7 pump in solids handling applications.
Parameter
Region 1
Region 2
Max. Discharge Velocity
30 ft/s (9.1 m/s)
25 ft/s(7.6 m/s)
Max. Impeller Peripheral Speed
7000 ft/min (2134 m/min)
6000 ft/min(1830 m/min)
Allowable % BEP Operation
40-110%
50-100%
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11
CORRECTION OF PUMP PERFORMANCE FOR VISCOUS LIQUID
The pump performance is affected when handling viscous liquids. A marked increase in brake horsepower, a
reduction in head, and some reduction in capacity occur with moderate and high viscosities. The Hydraulic
Institute Standard provides correction curves for determining the performance of a pump handling a viscous
liquid when its performance on water is known. These charts are to be used only within the scales shown. Do
not extrapolate. Use only when adequate NPSH is available in order to avoid cavitation. For non-uniform
liquids (slurries, gels), the characteristic of the liquid may produce varying results.
EFFICIENCY
Recalculate the efficiency for the corrected power consumption and any viscous effects.
NPSHA
Proper quotation of NPSHA is extremely important. Inadequate NPSHA can result in severe vibrations,
premature wear, and in the worst case the pump will not work. NPSHA must be accurately determined and a
proper margin should be maintained to ensure good reliable operation.
NPSHR (shown on the pump curves) is determined in accordance with Hydraulic Institute standards. It is the
point where the TDH has decreased 3% from normal. Since optimum reliability and life will be achieved when
little or no cavitation is present, an operating safety margin must be applied to the NPSHR. As a general rule
a margin of 3 Feet is usually adequate.
If the NPSHR > NPSHA consider the following:
•
•
decrease speed
use larger size pump
AIR INGRESS
In certain applications with low suction pressure, air may be pulled in through the expeller and entrained in
the liquid being pumped. The effect on the pump depends on the impeller configuration. If a standard
impeller is used, the air induced through the seal will pass through the pressure balancing holes to the intake
side of the impeller. The immediate effect is a drop in capacity and power followed by a loss of prime if more
gas than the impeller can handle is present. The presence of 2% free air will result in 10% reduction in
capacity, 4% of free air will reduce the capacity by 44%. If an impeller without balancing holes is used, the air
will be passed directly to the discharge section of the pump. The air passing through the expeller cavity into
the discharge will also have a detrimental effect on pump performance and pump wear. It is therefore
important to avoid air ingress and operate within the suction pressure range indicated in the “Suction
Pressure Limits” curves. Operating below the minimum suction pressure curve must be avoided.
Consideration must be given to the use of alternate or secondary sealing to minimize or prevent the air
ingress.
12
A2648 rev-
DYNAMIC SHAFT DEFLECTION AT MAXIMUM HYDRAULIC LOAD
PER ASME B73.1M ---- Dimensions in inches. Deflection calculated at speed (N) shown in table with
maximum impeller diameter. For maximum pump operating speed, consult engineering. (Eng-ref.A1177)
DIMENSION
DESIGNATION
SUCTION x
DISCHARGE x
MAX IMPELLER
DIAMETER
SHAFT
DEFLECTION
AT IMPELLER
CENTER LINE
(BEP Q)
AA
AB
AA
A50
A60
A70
A05
A50
A60
A70
A80
A20
A30
A40
A80
A110
A120
-----
1.5 x 1 x 6
3 x 1.5 x 6
1.5 x 1 x 8
3 x 1.5 x 8
3x2x8
4x3x8
2 x 1 x 10
3 x 1.5 x 10
3 x 2 x 10
4 x 3 x 10
6 x 4 x 10
3 x 1.5 x 13
3 x 2 x 13
4 x 3 x 13
6 x 4 x 13
8 x 6 x 15
10 x 8 x 15
8 x 6 x 16S
10 x 8 x 16S
0.0004
0.0007
0.0006
0.0013
0.0014
0.0016
0.0008
0.0012
0.0016
0.0024
0.0020
0.0011
0.0020
0.0014
0.0015
0.0030
0.0031
0.0030
0.0031
F1
F2
F3
F4
SHAFT
DEFLECTION
AT IMPELLER
CENTER LINE
(min Q) /
(% BEP)
0.0013 (0%)
0.0021 (0%)
0.0015 (0%)
0.0039 (0%)
0.0050 (0%)
0.0053 (0%)
0.0029 (0%)
0.0048 (0%)
0.0046 (30%)
0.0064 (30%)
0.0050 (20%)
0.0026 (30%)
0.0040 (40%)
0.0040 (40%)
0.0029 (40%)
0.0075 (50%)
0.0077 (50%)
0.0077 (60%)
0.0080 (60%)
SHAFT
DEFLECTION
AT SEAL
(min Q)
N
[RPM]
0.0004
0.0007
0.0005
0.0013
0.0016
0.0017
0.0010
0.0016
0.0015
0.0021
0.0016
0.0009
0.0013
0.0013
0.0010
0.0023
0.0023
0.0023
0.0025
3550
3550
3550
3550
3550
3550
3550
3550
3550
3550
1750
3550
3550
2950
1750
1750
1750
1450
1450
SHAFT FLEXIBILITY RATIO
A7
FRAME 1
FRAME 2
FRAME 3
FRAME 4
3
L /D
77
86
38
48
4
L= Impeller Overhang (distance from the center of the impeller to the center of the front bearing)
D= Shaft Diameter (does not consider contributions of the shaft sleeve to the stiffness of the shaft)
A2648 rev-
13
STANDARD PUMP DEFINITION
The A7 family of Wilfley pumps conforms to ASME B73.1M-91 requirements. Whenever possible, select a
“standard” configuration pump. This will be most economical and readily available. The “option” features are
pre-engineered and available at extra charge. The “engineered special” options will require extra cost and
longer deliveries.
STANDARD FEATURES
OPTIONS
Standard Bearings
Oil lubricated bearings
Non-Metallic Labyrinth Bearing Seal
Extreme Duty Bearings
Grease, oil mist, constant level oiler
Magnetic Bearing Seal
Micro Tech Filter
316SS
Frame and Bearing Carrier Material:
Ductile Iron
Frame with sight glass on the right side
(viewed from the motor end)
O-Ring Material: VITON
Wet end without auxiliary connections
Wet end Material: DI, 316SS, A20,
TM
WCD4
150# Flat Faced Flanges
Sight glass on the opposite side or on
both sides.
Oil cooling provisions for pumping
o
temperatures > 350 F.
Kalrez, Teflon encapsulated
½” NPT connection for Case Drain
Casing steam jackets.
®
Lube seal as secondary seal- for E-Magnet
¼” NPT connection
for Gage
Alloys-special order
300# Flat Faced Flanges; 150 & 300#
Raised Faced Flanges
DryLock seal, E-Magnet
Labyrinth as secondary seal
ENG. SPECIALS
Packing, Mechanical
Seal
Double grease lip seal as secondary
®
seal- for DryLock
No vapor seal,
Non Contacting Barrier Seal
¼” Expeller Cavity Drain, Expeller
cavity flash, Flush connections for
seals
Flushing Hardware
Temperature limitation for the standard pump: 250°F.
For higher temperature application consult factory.
USE THE FOLLOWING REFERENCES FOUND IN THE APPLICATION GUIDE:
1.
2.
3.
4.
5.
14
Select seal based on the “Seal selection guide”.
Select seal material based on ”Chemical compatibility guide”.
Select “Wet end” materials based on ”Chemical compatibility guide”, corrosion, and wear resistance.
Check the “Pressure - Temperature” chart.
Check bearing life based on “Bearing Life charts”.
A2648 rev-
SEAL SELECTION GUIDE
SEAL CONFIGURATIONS
Wilfley pumps are great problem solvers due to their unique features and proprietary metallurgy. The heavyduty construction of these pumps provides a longer service life in many demanding applications where
competitors’ pumps simply do not hold up. However, pump selection must be carefully accomplished to
ensure success. In broad terms this means attention to details and proper review of:
•
•
•
•
•
Hydraulic conditions.
Mechanical loads imposed by hydraulic rating, pumpage and environment.
Sealing the pumpage where the shaft penetrates the casing.
Corrosion and erosion resistance.
Operating conditions.
Sealing is traditionally most troublesome for pumps and also represents the area where Wilfley offers the
most innovative and unique solution. As such, it requires particular attention. All service aspects must be
known and well understood before a Wilfley seal can be properly specified and the customer advised. The
selection guidelines are presented in the A7 Application Guide, but good judgment must be used to engineer
the final solution.
Wilfley’s job does not end with the order or delivery of the equipment. We need to work with the user to
ensure he operates the equipment properly so he will be satisfied with it. If we have done the job correctly
on the front end, problems should be minimized, but undoubtedly some problems will occur with some
installations.
®
WilfleyA7 pumps can be equipped with a large variety of seals including the proprietary DryLock seal,
Wilfley diaphragm, a full range of mechanical seals and packing.
Seal Name
®
DryLock Standard
Seal Max. Min.
%
Type Temp. speed
solids
(ID) (°F) (RPM)
Handles
crystallizing
liquids
Handles
vapors
Seal/
Suction pressure
expeller
limitation (ft)
washout
Per
No/Yes
App. Guide
Per
Yes/Yes
App. Guide
Per
No/Yes
App. Guide
Per
No/Yes
App. Guide
Per
Yes/Yes
App. Guide
Per
Yes/Yes
App. Guide
A
250
1000
<10
No
No
A
250
1000
<10
No
Yes
B
370
1000
<10
No
Yes
C
300
1000
<25
F
370
1000
<45
Yes
Yes***
G
370
1000
<65
Yes
Yes
Diaphragm
H
370
0
<65
Yes
No
No/Yes
Min. 11 ft
Packing retrofit
w/expeller
E
400
0
Yes
Limited
NA/Yes
Pump limit
Packing
D
400
0
Yes
Limited
N/A
Pump limit
400
0
No
Yes
N/A
Pump limit
®
DryLock Standard
with Lube
®
DryLock High
Temperature
®
DryLock for light
slurry services
®
DryLock with
packing backup
®
DryLock w/carbon
seal and lube seal
Mechanical Seal
*** If continuously flushed
A2648 rev-
15
SEAL CONSTRUCTION
DryLock® Seal
Material
Item No.
17
18
19
20
23
24
24a
24b
24c
25
26
26a
26b
28
30
30a
34
34a
34b
34c
37
37a
39
39a
40
40a
42
43
94
94a
•
•
•
16
Name
DUCTILE
IRON
DI
VITON
VITON
VITON
T9
DI
T29
T29
18-8
T5*
A20
18-8
18-8
T9
DI
VITON
CD4
18-8
302
302
316SS
TM
ALLOY 20
TM
A20
VITON
VITON
VITON
T9
A20
T29
T29
18-8
T5*
A20
18-8
18-8
T9
A20
VITON
CD4
18-8
302
302
WCD4
Expeller
316S
WCD4
O-Ring, Shaft Sleeve
VITON
VITON
O-Ring, Expeller
VITON
VITON
O-Ring, Shaft
VITON
VITON
Stationary Seal Ring
T9
T9
TM
Rotary Seal Housing
316S
WCD4
Slide ring
T29
T29
Slide ring
T29
T29
Drive Screw
18-8
18-8
Lip Seal
T5*
T5*
Seal Retainer
A20
A20
Lock washer
18-8
18-8
Cap Screw
18-8
18-8
Lube Seal/ Labyrinth
T9
T9
TM
Seal Housing
316S
WCD4
O-Ring, Seal Housing
VITON
VITON
Ball Housing
CD4
CD4
Retainer Ring
18-8
18-8
Spring Pin
302
302
Key
302
302
Lubricator
Pipe Nipple
Steel
Steel
Steel
TM
Shaft Sleeve
316SS
316S
WCD4
Retaining Ring
18-8
18-8
18-8
Ball Retainer
TEFLON
TEFLON
TEFLON
Balls
316SS
316SS
316SS
Spring
302
302
302
Actuator
CD4
CD4
CD4
Guard
Steel
Steel
Steel
Cap Screw
18-8
18-8
18-8
* Spring material in Lip Seal Item 25: Hastelloy C-276
Steel
A20
18-8
TEFLON
316SS
302
CD4
Steel
18-8
Seal temperature limitation: Max 250°F.
For higher temperature applications consult the factory.
For seals and o-rings materials see “Chemical Compatibility” document for specific application
recommendations.
A2648 rev-
DRYLOCK® SEALS – DESCRIPTION AND DRAWINGS
While the pump is running the seal is friction free: the faces are open and the stationary seal lip is not in
contact with the rotary seal housing. At shut down of the pump the seal closes under the force of the helical
spring, and stops leakage. The lip of the stationary seal gains contact with the rotary seal housing to avoid
splashing and thus extends seal life. This is an excellent feature in clear liquids but can be a disadvantage if
liquid crystallizes or solids plate or settled at shut down. The backup seal is available to prevent vapor
exchange and to enable wash out of the seal while the pump is running.
®
The integrity and consequently the life of the DryLock stationary seal is depending upon the correct
selection of the seal features based on suction pressure, pump speed and characteristics of the pumping
liquid.
Suction Pressure
The suction pressure must not exceed the expeller capability. If the pump is leaking while running the
pumpage will damage the seal faces. Leakage may not be evident immediately but if limit is exceeded the
liquid will get between the seal faces and lead to seal failure.
Note: check suction pressure limits at all operating speeds.
The pump speed must be above the recommended minimum speed, otherwise the seal faces will rotate in
closed position and will overheat and distort. Applications with Variable Frequency Drives should be
evaluated to be sure the expeller limits would not be exceeded at any speed.
A2648 rev-
17
DRYLOCK® SEAL ASSEMBLY (ALL FRAMES)
ITEM NO. QTY
DESCRIPTION
17
1
EXPELLER
18*
1
O-RING, SHAFT SLEEVE
19*
1
O-RING, EXPELLER
20*
1
O-RING, SHAFT
23*
1
STATIONARY SEAL REAL
24*
1
ROTARY SEAL HOUSING
24a*
1
SLIDE RING
24b*
1
SLIDE RING
24c
4
DRIVE SCREW
24d
4
DRIVE SCREW NUT
25*
1
LIP SEAL
26*
1
SEAL RETAINER
26a
4
LOCKWASHER
26b
4
CAP SCREW
28
1
LUBE SEAL/LABYRINTH SEAL
30
1
SEAL HOUSING
30a*
1
O-RING, SEAL HOUSING
34
1
BALL HOUSING
34a
1
RETAINING RING
34b
1
SPRING PIN
34c
1
KEY
37*
1
LUBRICATOR (NOT SHOWN)
37a
1
PIPE NIPPLE (NOT SHOWN)
39
1
SHAFT SLEEVE
39a
1
RETAINING RING
40
1
BALL RETAINER
40a
12
BALLS
42
1
SPRING
43
1
ACTUATOR
94
1
GUARD (NOT SHOWN)
94a
2
CAP SCREW (NOT SHOWN)
94b
2
LOCKWASHER
III
1
SEAL WASHOUT PORT (1/4 NPT)
IV
1 EXPELLER DRAIN PORT (1/4 NPT)
EXPELLER WASHOUT PORT
VI
1
(1/4 NPT FOR FRAME 1)
(3/8 NPT FOR FRAME 2, 3, 4)
VII
1 GREASE BACK-UP PORT (1/8 NPT)
SEAL DRAIN PORT
VIII
1
(1/4 NPT FOR FRAME 1)
(1/2 NPT FOR FRAME 2, 3, 4)
18
A2648 rev-
STANDARD DRYLOCK® SEAL (TYPE A)
®
o
The standard DryLock seal was developed to operate below 300 F and handle non-crystallizing liquids with
less than 10 % solids. Applications outside these criteria will require special operating technique and/or
special engineering.
®
Standard DryLock Seal Assembly (Type A)
®
The construction material for the DryLock components should be reviewed for compatibility with the pumped
liquid:
•
•
•
Standard graphite filled Teflon stationary seal-T9 can be changed to glass filled teflon-T42 (for
example when pumping ammonium nitrate or other liquids were contact with carbon has to be avoided)
Standard viton O-ring can be changed to EPDM, Kalrez, or any other materials
Standard Hastelloy C-276 lip seal spring can be replaced by a viton or EPDM O-ring (for example in
hydrochloric or sulfuric acid applications- see Engineering procedure No.8)
®
The backup seal in standard DryLock is a labyrinth spacer. Usually the labyrinth and stationary seal are
manufactured from the same material.
A2648 rev-
19
DRYLOCK® WITH LUBE SEAL BACKUP (TYPE A)
In applications where a barrier is required to prevent vapors leakage or air entering the pumped liquid, the
labyrinth backup seal must be replaced by a lube seal.
Through the lube port (see Fig.2) grease is continuously supplied filling the space between the lube seal lips
and creating a gas barrier. The seal cannot be used to contain pressure spikes or solve other application
problems. Even if initial leakage is prevented seal failure will be imminent.
The presence of the grease barrier creates the possibility of washing the faces of the stationary seal while
the pump is running. This practice should be employed before the pump stops or starts to clear the seal
faces of all solids especially when very abrasive particles are present either settled or suspended.
®
DryLock with Lube Seal Assembly (Type A)
HI-TEMPERATURE DRYLOCK® (TYPE B)
The Hi temperature seal is restricted to non-crystallizing liquids with less than 10% solids. It was special
o
o
designed to operate above 250 F, but not exceeding 370 F. Labyrinth or lube seal can be used as backup.
®
Hi-Temperature DryLock Seal Assembly (Type B)
20
A2648 rev-
DRYLOCK® FOR LIGHT SLURRY SERVICES (TYPE C)
The seal was developed for applications with solids between 10 and 25%. The seal housing without drip lip
and the rotary seal housing with pumping vanes options allow an efficient washing of the expeller cavity
before the pump is shut off through the expeller wash port.
®
DryLock for Light Slurry Services Seal Assembly (Type C)
(with Expeller Wash Port and Rotary Seal Housing with Pumping Vanes)
DRYLOCK® WITH PACKING BACKUP (TYPE F)
Was developed for applications were the pumping liquid crystallizes. This seal requires washing continuously
or before shut down, with steam or condensate through the grease port, while the pump is running.
®
DryLock with Packing Backup Seal Assembly (Type F)
A2648 rev-
21
DRYLOCK® WITH PACKING BACKUP (TYPE G)
A variation of this seal is Type G. Washing continuously or before shut down, with steam or condensate
through the seal wash port is recommended. The lube back up constitutes the vapor barrier and directs the
wash liquid toward the pump.
®
DryLock with Carbon Seal and Lube Backup Seal Assembly (Type G)
WILFLEY DIAPHRAGM (TYPE H)
®
This seal is recommended in applications were the DryLock is exceeding the customer needs and they
prefer an inexpensive, though less reliable seal. The diaphragm is used with the expeller. When the pump
stops the liquid flows into the stuffing box, forcing the elastomer diaphragm to close and therefore prevents
leakage. The static pressure should exceed 10 ft. in order to provide a positive seal containment. Some
leakage is likely with this arrangement, but it offers a simple alternative for leakage control.
Wilfley Diaphragm Seal Assembly (Type H)
22
A2648 rev-
PACKING (TYPE E & D)
®
Packing should be considered for pumpage with solids concentration higher than the DryLock can handle.
In such cases pump speed, rating and material of construction should be carefully reviewed because higher
wear rate is expected. Packing is an alternative solution when the suction pressure exceeds the expeller
capability or operating below min. speed. All packing applications will include a flush connection and lantern
ring. Packing can be installed with or without an expeller. Packing with expeller is an inexpensive way to
retrofit a pump.
Packing Retrofit Seal Assembly (Type E)
Packed pump assembly (Type D)
A2648 rev-
23
MECHANICAL SEALS
®
Mechanical seals may be appropriate if the expeller capability is exceeded, speed is below the DryLock
minimum requirement, pumping hazardous materials, or volatile. Wilfley pumps can accommodate a large
variety of mechanical seals. The mechanical seal should be selected for the specific application or per
customer recommendation. The factory must review such applications.
RECOMMENDATIONS FOR DIFFICULT PUMPAGE
The integrity of the seal depends on the condition of the environment. While running, the stationary seal is
open and free of contact with the pumped liquid. Upon shut down, the liquid reaches the seal that usually is
in the process of closing. The seal and sliding surfaces must be kept free of deposits of solids to maintain the
functionality of the seal.
In some applications, this requires washing the expeller cavity before shutting dawn and before pump start
up. Since small differences can affect these applications in unpredicted ways, it is recommended that the
seal flush connection to be incorporated and available if later needed. High pressure flushing of the system
must be avoided. If high-pressure steam or liquid is employed for cleaning the system, it is possible to
damage the lip of the stationary seal through bending or cracking. (See also “Product bulletin 14” for details
on flushing)
For automatic washing cycles a simple control panel could be employed
Customer information about the pumped fluid, and possible problems experienced with other pumps used in
similar applications, are extremely important in determining if expeller flush is required. The following are
some examples of applications that require expeller wash, however other pumpage that display similar
detrimental effects require washing as well.
Typical Flush Piping Schematic
24
A2648 rev-
Washing improves seal mobility, but reduced life should be expected under the following adverse conditions:
•
Liquids with settling solids, more than 15% by weight. The settling solids will have a tendency to entrap
and break the lip of the stationary seal and damage the seal surface.
•
Caustics, brines, crystallizing solutions. Some liquids pump very well within a given range of
temperature but changes in temperature or contact with the atmosphere produces drastic changes in
the pumping characteristics: higher viscosity, gummy, crystallization, etc. These are applications that
must be carefully analyzed, sometimes requiring intermittent flushing even during operation.
Washing control panel
•
Abrasive slurries more than 10-25% by weight. Even if the solids are not settling, at start up the
abrasive solids will erode the lip and consequently the seal face, reducing the seal life.
BACKUP SEALS
•
®
LUBE SEAL FOR DRYLOCK
Standard lips arrangement:
This arrangement optimizes life and reliability. The orientation of the outer lip will stop air ingress into the
pump, while the inner lip orientation stops fumes or vapor emission into the atmosphere.
A2648 rev-
25
IMPELLER
IMPELLER STANDARD CONFIGURATION
Standard configuration: impellers with pressure balancing holes.
Impellers without balancing holes can be provided and should be considered for high suction pressure
applications where adequate bearing life cannot be obtained with a standard impeller.
STANDARD IMPELLER DIAMETER
FRAME
NO.
1
2
3
4
4
MAX. IMPELLER
DIAMETER (IN)
6.25
8, 10
13
15
16
TYPE
IMPELLER
SEMI OPEN
SEMI OPEN
SEMI OPEN
CLOSED
SEMI OPEN
IMPELLERS WITH BALANCE HOLES vs. IMPELLER WITHOUT HOLES:
Advantages:
•
•
•
•
Continuous liquid circulation in the secondary expeller cavity
Constant suction pressure across entire flow range
Higher bearing life (in low suction pressure applications)
Higher suction pressure capability at maximum impeller diameter
Disadvantages:
•
Lower efficiency
APPLICATION
Thermally sensitive fluids that will solidify
if temperature is raised beyond pumping
temperature
All applications to maximize suction
pressure capability
Very high suction pressure
BALANCE HOLES
Yes
Yes
No
NOTES
Good heat transfer in the secondary
expeller cavity
Higher MIH at zero flow and
maximum impeller diameter
Lower bearing life in some situations
IMPELLER BALANCING CRITERIA
Impeller must be properly balanced to avoid excessive vibration at running speed and achieve reliable
operation. High unbalance will cause a rotating load that is detrimental to the shaft, seals, coupling and
bearing life. Balancing can be done to different quality grades as given in ISO 1940/1, or to meet specific
customer requirements.
The standard level of balance for impellers follows ISO 1940/1 quality grade G 6.3.
All impellers are single plane balanced.
Requests for other balance tolerances must be referred to the factory for approval and pricing.
26
A2648 rev-
IMPELLER CLEARANCES (INCHES)
Max .Service Temperature Frame 1 Frame 2 Frame 3
200°F (93°C)
0.010
0.012
0.015
250°F (121°C)
0.012
0.014
0.017
300°F (149°C)
0.014
0.016
0.019
+/- 0.001” Clearance tolerance
Frame 4
0.020
0.022
0.024
SECONDARY EXPELLER
The secondary expeller creates a hydraulic seal while the pump is running.
In the standard configuration the allowable suction pressure range, at a given RPM, is determined by the
diameter of the secondary expeller and is only slightly affected by the size of the impeller.
TRIMMING THE SECONDARY EXPELLER WILL:
•
•
•
•
REDUCE SUCTION PRESSURE CAPABILITY
REDUCE THRUST LOADS AND INCREASE BEARING LIFE
INCREASE EFFICIENCY
REDUCE EXPELLER CAVITY ABRASION WEAR (IN SLURRY APPLICATIONS)
FRAME
NO.
1
FRAME 2 - 8” PUMP
FRAME 2 - 8 &10” PUMP
FRAME 2 - 10” PUMP
3
4
EXPELLER DIAMETERS
(IN)
7
7
8
10
10, 12
13
In the high suction pressure configuration both the impeller and secondary expeller diameters determine
the suction pressure capability.
When a mechanical seal or packing is used the secondary expeller is eliminated.
See the “Suction Head Limits” curves for different size expeller and different speeds.
A2648 rev-
27
MATERIAL SELECTION GUIDE
MATERIALS OF CONSTRUCTION
pH VALUES
The pH of a liquid is an indication of its corrosive qualities, either acidic or alkaline. It is a measure of the
hydrogen or hydroxide ion concentration in gram equivalents per liter. pH value is expressed as a decimal
logarithm of the reciprocal of the hydrogen ion concentration. The scale of pH values is from zero to 14, with
7 as a neutral point. From 6 to zero denotes increasing hydrogen ion concentration and thus increasing
acidity, with zero being the most acid; from 8 to 14 denotes increasing hydroxide ion concentration and thus
increasing alkalinity, with 14 being the most alkaline.
The table below outlines materials of construction usually recommended for pumps handling liquids of known
pH value.
pH
10 to 14
8 to 10
6 to 8
4 to 6
0 to 4
Material of Construction
Corrosion Resistant Alloys
Ductile Iron
Carbon Steel
Stainless Steel
Corrosion-Resistant Alloys
The pH values should only be used as a guide with weak aqueous solutions. For more corrosive solutions,
temperature and chemical composition should be carefully evaluated in the material selection.
For normal pH and chloride operation levels, see “Material Selection” curve on page 22.
28
A2648 rev-
MATERIAL SELECTION FOR NORMAL pH AND CHLORIDE OPERATION
LEVELS
This chart is to be used as a guide for material selection for weak acid or alkaline aqueous solutions in
conjunction with chloride levels.
CHEMICAL COMPATIBILITY
The following charts are intended as a guide in the selection of economical materials. The corrosion rates
may vary widely with temperature, concentration, and the presence of trace elements or abrasive solids.
For more information, please see the following charts:
Chemical Compatibility Chart
ISO Corrosion Charts
CASING AND FLANGES MATERIALS
MATERIAL
CODE
DI
316S
A20
TM
WCD4
A2648 rev-
TENSILE
YIELD
ELONGATION HARDNESS
STRENGTH POINT
(%)
(BRINELL)
(psi)
(psi)
Ductile Iron 80
A536,Gr.80-55-6
80,000
55,000
6
180–255
316 SS
A744,Gr. CF8M
70,000
30,000
30
154
Alloy 20
A744,Gr. CN7M
62,000
25,000
40*
133
Wilfley CD4MCu
140,000
100,000
16
320–350
* Wilfley A20 has better elongation than ASTM requirement.
See the Pressure – Temperature rating curves for the Class 150 and 300 flanges.
NAME
ASTM
SPECIFICATION
29
CLASS 150 FLANGES: PRESSURE –TEMPERATURE RATINGS
CLASS 300 FLANGES: PRESSURE –TEMPERATURE RATINGS
30
A2648 rev-
BEARING GUIDE
BEARING LUBRICATION
Standard lubrication is Simple-Wet-Sump method with sight glass. Oil mist and constant level oilers are
optional at extra cost.
LUBRICATING OIL REQUIREMENTS
ISO Grade
Approx. SSU @ 100°F(38°C)
DIN 51517
Kinem. viscosity at 105°F mm2/sec
Bearing Temp. < 180°F
VG 68
300
C68
68
Bearing Temp. > 180°F
VG 100
470
C100
100
Grease lubrication is optional. For most operating conditions, a lithium based mineral oil grease of NLGI
o
consistency No.2 is recommended. This grease is acceptable for bearing temperatures of max. 230 F.
BEARING SELECTION
Both bearings INBOARD and OUTBOARD must be reviewed to ensure they meet 2 years L10 minimum
calculated life. Standard thrust bearings are normally preferred, but calculated L10 life must be checked on
the following nomogrames to ensure they yield the required min. of 2 years with the specific job conditions. If
job conditions exceed the two years capability, select the Extreme Duty Bearing option.
OUTBOARD BEARINGS
From the selected impeller diameter project a line through the specific gravity of the pumped liquid until it
intersects the max. suction pressure line. Interpolate the value. This value represents the maximum suction
pressure, at 3550 RPM and 8” expeller diameter, for which the bearing has a 2 year L10 life. For different
speed or expeller diameter apply the correction coefficients to obtain the max. suction pressure. If the suction
pressure required in the application is below this value the bearing life will be greater than 2 years, if the
suction pressure is above this value, the extreme duty bearing must be used.
See the attached example for calculation procedure.
FOR BEARING LIFE FOR A SPECIFIC APPLICATION CONSULT FACTORY.
INBOARD BEARINGS:
The curves show standard duty bearing life L10 as a function of specific gravity at maximum speed, zero flow,
and full size standard impeller. Changing the expeller diameter does not affect the inboard bearing life.
For other speeds or impeller sizes apply the formulas indicated on the curves.
FOR SPECIFIC GRAVITY HIGHER THAN 1.9 CONSULT FACTORY.
A2648 rev-
31
INBOARD BEARINGS (FRAME 1 & 2)
32
•
Bearing life for other impeller diameters varies approximately inversely with the ratio of the impeller
diameter to the ninth power.
•
Bearing life for other speeds varies approximately inversely with the ratio of the speed to the seventh
power.
A2648 rev-
INBOARD BEARINGS (FRAME 1 & 2)
A20-13
A80-13
1750 RPM
A40-13
1.9
1.8
A30-13
3550 RPM
1.7
SPECIFIC GRAVITY
1.6
1.5
1.4
1.3
1.2
1.1
1.0
0.9
1
2
3
4 5 6 7 89
10
2
3
4 5 6 7 89
100
2
3
STANDARD BEARING L10 LIFE-YEARS
•
Bearing life for other impeller diameters varies approximately inversely with the ratio of the impeller
diameter to the ninth power.
•
Bearing life for other speeds varies approximately inversely with the ratio of the speed to the seventh
power.
A2648 rev-
33
AA-6
AB-6
34
A2648 rev-
AA-8
A50-8 & A60-8
A2648 rev-
35
A70-8
A05-10
36
A2648 rev-
A50-10
A60-10
A2648 rev-
37
A70-10
38
A2648 rev-
A110-15
RANGE LIMITS FOR 2 YEAR L10 BEARING LIFE
250
2 S.G.
50%
200
BEP
HEAD [FT]
1 S.G.
150
MAX. IMPELLER DIAMETER
1750 RPM
2.0 S.G.
100
STANDARD BEARINGS
50
EXTREME DUTY BEARINGS
0
0
500 1000 1500 2000 2500 3000 3500
CAPACITY [GPM]
RANGE LIMITS FOR .002" SHAFT DEFLECTION
AT SEAL FACES
250
55%
78%
200
HEAD [FT]
BEP
150
1 S.G. 1.3 S.G.
2.0 S.G.
100
50
0
0
500 1000 1500 2000 2500 3000 3500
CAPACITY [GPM]
A2648 rev-
39
A120-15
RANGE LIMITS FOR 2 YEAR L10BEARING LIFE
1.9 S.G.
200
BEP
55%
150
MAX. IMPELLER DIAMETER
1750 RPM
HEAD [FT]
1.3 S.G.
100
EXTRA DUTY BEARINGS
STANDARD BEARINGS
50
0
0
500
1000
1500
2000
2500
3000
3500
4000
4500
CAPACITY [GPM]
RANGE LIMITS FOR .002" SHAFT DEFLECTION
AT SEAL FACES
61%
200
70%
1 S.G.
BEP
150
HEAD [FT]
1.3 S.G.
1.5 S.G.
100
50
0
0
500
1000
1500
2000
2500
3000
3500
4000
4500
CAPACITY [GPM]
40
A2648 rev-
PUMP INSTALLATION
DRIVES AND BASES
MODEL A7 PUMP: FRAMES 1-4 DIRECT DRIVEN PUMP DIMENSIONS
A7 Frame Size
1
2
3
4
A2648 rev-
Pump designation
Size
CP
D
Y
X
AA-6, AA-8
AB-6
A05-10
A10-6
A50-8, A50-10
A60-8, A60-10
A70-8, A70-10
A80-10
A20-13
A30-13
A40-13
A80-13
A110-15
A120-15
1.5 x 1
3 x 1.5
2x1
3x2
3 x 1.5
3x2
4x3
6x4
3 x 1.5
3x2
4x3
6x4
8x6
10 x 8
17.5
17.5
23.5
23.5
23.5
23.5
23.5
23.5
23.5
23.5
23.5
23.5
33.88
33.88
5.25
5.25
8.25
8.25
8.25
8.25
8.25
10
10
10
10
10
14.5
14.5
4
4
4
4
4
4
4
4
4
4
4
4
6
6
6.5
6.5
8.5
8.25
8.5
9.5
11
13.5
10.5
11.5
12.5
13.5
18
19
U
Dia.
.88
.88
1.12
1.12
1.12
1.12
1.12
1.12
1.12
1.12
1.12
1.12
2.375
2.375
Keyway
.188 x .094
.188 x .094
.250 x .125
.250 x .125
.250 x .125
.250 x .125
.250 x .125
.250 x .125
.250 x .125
.250 x .125
.250 x .125
.250 x .125
.625 x .312
.625 x .312
41
MODEL A7 PUMP: FRAMES 1-4 DIRECT DRIVEN MOTOR DIMENSIONS
A7
Frame
Size
1
2
3
4
42
Base
Size
Motor Size
HA
Max
HB
HD
Max
HE
HF
HG Max
φ HH
HL
HP
139
148
153
245
252
258
264
268
280
245
252
258
264
268
280
368
380
398
143T-184T, 80M-112M
213T-256T, 132S-160L
284TS-326TS, 180M-180L
143T-184T, 100L -112M
213T-215T, 132S-132M
254T-286T, 160M-180L
324TS-365T, 200L-225M
404TS-405TS, 250M
405T-445T, 280S-280M
143T-184T, 100L-112M
213T-215T, 132S-132M
254T-286TS, 160M-180L
324T-365TS, 200L-225M
404T-405TS, 250M
405T-447TS, 280S-280M
284T-286T, 180M-180L
324T-405TS, 200L-250M
444T-449TS, 280S-315L
15
18
21
15
18
21
21
26
26
15
18
21
21
26
26
26
26
26
39
48
53
45
52
58
64
68
80
45
52
58
64
68
80
68
80
98
9
10.50
12.88
12
12.38
13
13.88
14.88
15.88
13.75
14.13
14.75
14.75
14.88
15.88
19.25
19.25
19.25
4.5
6
7.5
4.5
6
7.5
7.5
9.5
9.5
4.5
6
7.5
7.5
9.5
9.5
9.5
9.5
9.5
36.5
45.5
50.5
42.5
49.5
55.5
61.5
65.5
77.5
42.5
49.5
55.5
61.5
65.5
77.5
65.5
77.5
95.5
3.75
4.13
4.75
3.75
4.13
4.75
4.75
4.75
4.75
3.75
4.13
4.75
4.75
4.75
4.75
4.75
4.75
4.75
.75
.75
.75
.75
.75
1
1
1
1
.75
.75
1
1
1
1
1
1
1
4.5
4.5
4.5
4.5
4.5
4.5
4.5
4.5
4.5
4.5
4.5
4.5
4.5
4.5
4.5
6.5
6.5
6.5
1.25
1.25
1.25
1.25
1.25
1.25
1.25
1.25
1.25
1.25
1.25
1.25
1.25
1.25
1.25
1.25
1.25
1.25
A2648 rev-
MODEL A7 PUMP: FRAMES 1-4 OVERHEAD V-BELT PUMP DIMENSIONS
A7 Frame Size
1
2
3
4
A2648 rev-
Pump designation
Size
CP
D
Y
X
AA-6, AA-8
AB-6
A05-10
A50-8, A50-10
A60-8, A60-10
A70-8, A70-10
A80-10
A20-13
A30-13
A40-13
A80-13
A110-15
A120-15
1.5 x 1
3 x 1.5
2x1
3 x 1.5
3x2
4x3
6x4
3 x 1.5
3x2
4x3
6x4
8x6
10 x 8
17.5
17.5
24.88
24.88
24.88
24.88
24.88
24.88
24.88
24.88
24.88
33.88
33.88
5.25
5.25
8.25
8.25
8.25
8.25
10
10
10
10
10
14.5
14.5
4
4
4
4
4
4
4
4
4
4
4
6
6
6.5
6.5
8.5
8.5
9.5
11
13.5
10.5
11.5
12.5
13.5
18
19
U
Dia.
.88
.88
1.75
1.75
1.75
1.75
1.75
1.75
1.75
1.75
1.75
2.375
2.375
Keyway
.188 x .094
.188 x .094
.375 x .188
.375 x .188
.375 x .188
.375 x .188
.375 x .188
.375 x .188
.375 x .188
.375 x .188
.375 x .188
.625 x .312
.625 x .312
43
MODEL A7 PUMP: FRAMES 1–2 OVERHEAD V-BELT MOTOR DIMENSIONS
Frame
1
2
44
Base Size
Motor Size
148
148
148
148
153
153
252
252
252
258
258
258
258
264
264
268
280
143T-145T, 80-90
182T-184T, 100-112
213T-215T, 132
254T-256T, 160
284T/TS-286T/TS, 180
324T/TS-326T/TS, 200
143T-145T, 80-90
182T-184T, 100-112
213T-215T, 132
160
180
254T-256T
284T/TS-286T/TS
324T/TS-326T/TS, 200
364T/TS-365T/TS, 225
404T/TS-405T/TS, 250
444T/TS-445T/TS, 280
HA
Max
18
18
18
18
21
21
18
18
18
21
21
21
21
21
21
26
26
HB
48
48
48
48
53
53
52
52
52
58
58
58
58
64
64
68
80
HD
Max
10.50
10.50
10.50
10.50
12.88
12.88
12.38
12.38
12.38
13
13
13
13
13.88
13.88
14.88
15.88
HE
HF
HG Max
6
6
6
6
7.5
7.5
6
6
6
7.5
7.5
7.5
7.5
7.5
7.5
9.5
9.5
45.5
45.5
45.5
45.5
50.5
50.5
49.5
49.5
49.5
55.5
55.5
55.5
55.5
61.5
61.5
65.5
77.5
4.13
4.13
4.13
4.13
4.75
4.75
4.13
4.13
4.13
4.75
4.75
4.75
4.75
4.75
4.75
4.75
4.75
φ HH HL
.75
.75
.75
.75
.75
.75
.75
.75
.75
1
1
1
1
1
1
1
1
4.5
4.5
4.5
4.5
4.5
4.5
4.5
4.5
4.5
4.5
4.5
4.5
4.5
4.5
4.5
4.5
4.5
HP
HQ Max
1.25
1.25
1.25
1.25
1.25
1.25
1.25
1.25
1.25
1.25
1.25
1.25
1.25
1.25
1.25
1.25
1.25
23
24
23.5
24.5
25.5
36.5
20.0
21.0
20.5
21.5
22.5
21.5
22.5
38.5
39.5
40.5
42.0
A2648 rev-
MODEL A7 PUMP: FRAMES 3–4 OVERHEAD V-BELT MOTOR DIMENSIONS
Frame
3
4
A2648 rev-
Base Size
Motor Size
252
252
252
258
258
258
258
264
264
268
280
368
368
380
380
380
398
398
143T-145T, 80-90
182T-184T, 100-112
213T-215T, 132
160
180
254T-256T
284T/TS-286T/TS
324T/TS-326T/TS, 200
364T/TS-365T/TS, 225
404T/TS-405T/TS, 250
444T/TS-445T/TS, 280
284T/TS, 180
286T/TS
324T/TS-326T/TS, 200
364T/TS-365T/TS, 225
404T/TS-405T/TS, 250
444T/TS-445T/TS
280-315
HA
Max
18
18
18
21
21
21
21
21
21
26
26
26
26
26
26
26
26
26
HB
52
52
52
58
58
58
58
64
64
68
80
68
68
80
80
80
98
98
HD
Max
14.13
14.13
14.13
14.75
14.75
14.75
14.75
14.75
14.75
14.88
15.88
19.25
19.25
19.25
19.25
19.25
19.25
19.25
HE
HF
HG Max
6
6
6
7.5
7.5
7.5
7.5
7.5
7.5
9.5
9.5
9.5
9.5
9.5
9.5
9.5
9.5
9.5
49.5
49.5
49.5
55.5
55.5
55.5
55.5
61.5
61.5
65.5
77.5
65.5
65.5
77.5
77.5
77.5
95.5
95.5
4.13
4.13
4.13
4.75
4.75
4.75
4.75
4.75
4.75
4.75
4.75
4.75
4.75
4.75
4.75
4.75
4.75
4.75
φ HH HL
.75
.75
.75
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
4.5
4.5
4.5
4.5
4.5
4.5
4.5
4.5
4.5
4.5
4.5
6.5
6.5
6.5
6.5
6.5
6.5
6.5
HP
HQ Max
1.25
1.25
1.25
1.25
1.25
1.25
1.25
1.25
1.25
1.25
1.25
1.25
1.25
1.25
1.25
1.25
1.25
1.25
18.5
19.5
19.0
20.0
21.0
20.0
21.0
37.0
38.0
39.0
40.5
16.5
18.5
32.0
33.0
34.0
37
36.0
45
PIPING
SUCTION PIPING
The suction pipe should never be smaller than the suction connection of the pump. Suction pipes should be
as short and as straight as possible. Suction pipe velocities should be in the 5 to 8 feet per second range
unless suction conditions are unusually good. Higher velocities will increase friction loss and can result in air
or vapor separation. This is further complicated when elbows or tees are located adjacent to the pump
suction nozzle, in that uneven flow patterns or vapor separation keeps the liquid from evenly filling the
impeller. This upsets hydraulic balance leading to vibration, possible cavitation, and excessive shaft
deflection. The suction piping must be kept free of air leaks. A straight length of pipe, about 10 pipe
diameters, is recommended between the suction flange and the first elbow.
DISCHARGE PIPING
A check valve and an isolation valve should be installed in the discharge line. The check valve, placed
between the pump and the isolation valve, is to protect the pump from reverse flow and excessive back
pressure. The isolation valve is required for flow regulation and for inspection and maintenance of the pump.
Discharge pipe velocities should be in the 70 feet per second range for clean liquid and about 25 feet per
second for slurries.
FOR MORE DETAILS CONSULT HYDRAULIC INSTITUTE RECOMMENDATIONS.
MAXIMUM ALLOWABLE FLANGE LOAD
It is desirable to support and restrain both the suction and discharge pipes near the pump to avoid
application of forces and moments to the pump casing. Allowable forces and moments can be found in
ANSI/HI 9.6.2. The specification can be located at www.pumps.org.
46
A2648 rev-