Low Silhouette Tray Deaerators

Roth
Roth Low
Low Silhouette
Silhouette
TRAY DEAERATORS
Boiler
Boiler Feedwater
Feedwater Heater
Heater
Capacities
Capacities to
to 50,000
50,000 lb/hr
lb/hr
Model RDTV-150-5-1-2
vertical tray type
deaerator
The Roth Solution:
Preheated, deaerated
conditioned water
reduces operating cost.
Roth deaerators are
assembled with Roth pumps
requiring only one- or two-foot
NPSH operating at 1750 rpm
Roth Pump Company
1 . 888 . 444 . ROTH
Reduce costs and improve system efficiency by
preheating and deaerating boiler feedwater
Roth tray type deaerators condition feedwater to 0% CO2 and only .005 cc/l of oxygen
Why deaerate boiler feedwater?
Choosing the right deaerator
There are many advantages to deaerating
water prior to boiler input, but they all boil
down to reduced cost operation.
• Water is heated during deaeration to near
the temperature of the boiler water, thus
minimizing the risk of thermal shock
damage to a high-value boiler system.
Roth tray type deaerators are generally considered the superior choice for most applications. These units use stainless steel for all
internal surfaces which come in contact with
undeaerated water.
• The deaerating process removes noncondensable gases (oxygen and carbon
dioxide) which tend to act as insulators
inhibiting the transfer of heat within the
boiler.
• Removal of oxygen and carbon dioxide
reduces corrosion within the boiler and
piping, extending the life expectancy of the
system and reducing maintenance cost.
• Higher temperature feedwater reduces the
chance of pressure drop within the boiler
which can occur when cold water is added.
• Recycling of steam from vents and flash
steam from traps that would otherwise be
vented to the atmosphere can result in
appreciable energy savings.
• Mechanical deaeration by a feedwater
deaerator can cut the amount of chemical
consumables used for water conditioning
for a continuing operating cost saving.
Residence time for undeaerated water
inside a tray type deaerator is longer, providing more efficient deaeration, particularly
where wide load swings occur. A large diameter hinged door affords easy access to internal trays and spray tubes for maintenance and
replacement.
Although tray type deaerators require a
larger initial investment, the benefits in efficiency and reduced cost of maintenance tend
to pay for themselves quickly.
Pump selection
Roth deaerators use low NPSH pumps. Most
pumps selected require only one foot NPSH
operating at 1750 rpm. By using these pumps,
the overall height of the unit can be lowered.
This can save on construction cost.
Roth Deaerator Specifications
Control and piping configurations will vary
depending upon job specifications and conditions. Dimensions are subject to change without
notice. Consult factory for certified dimensions.
Legend for drawings
1.
2.
3.
4.
5.
6.
7.
8.
9.
10.
11.
12.
Model
* = # of
pumps
RDTV150-5-1-*
Capacity
Lb/h
(kg/h)
Boiler hp
(kW)
5,000
(2,268)
145
(1,422)
10,000
(4,536)
290
(2,844)
15,000
(6,804)
435
(4,267)
20,000
(9,072)
580
(5,686)
25,000
(11,340)
725
(7,107)
30,000
(13,608)
870
(8,529)
35,000
(15,876)
1,015
(9,950)
40,000
(18,144)
1,160
(11,372)
45,000
(20,412)
1,305
(12,793)
50,000
(22,680)
1,450
(14,214)
Storage
gallons (l)
100
(378)
200
(757)
300
(1,135)
400
(1,514)
500
(1,893)
600
(2,271)
700
(2,650)
800
(3,028)
900
(3,407)
1,000
(3,785)
A. Overall
length
66
(168)
66
(168)
66
(168)
84
(213)
84
(213)
84
(213)
96
(244)
96
(244)
96
(244)
96
(244)
B. Overall
width
54
(137)
54
(137)
54
(137)
72
(183)
72
(183)
72
(183)
84
(213)
84
(213)
84
(213)
84
(213)
C. Overall
height
83
(211)
99
(251)
113
(287)
108
(274)
116
(295)
124
(315)
125
(318)
131
(333)
141
(358)
147
(373)
D. Tank
diameter
42
(107)
42
(107)
42
(107)
60
(152)
60
(152)
60
(152)
72
(183)
72
(183)
72
(183)
72
(183)
E. Overflow
trap
2 NPT
2 NPT
2 NPT
3”, 150 lb
flange
3”, 150 lb
flange
3”, 150 lb
flange
3”, 150 lb
flange
3”, 150 lb
flange
3”, 150 lb
flange
3”, 150 lb
flange
20
(51)
20
(51)
20
(51)
24
(61)
24
(61)
24
(61)
24
(61)
24
(61)
24
(61)
24
(61)
3”, 150 lb
flange
3”, 150 lb
flange
3”, 150 lb
flange
4”, 150 lb
flange
4”, 150 lb
flange
4”, 150 lb
flange
6”, 150 lb
flange
6”, 150 lb
flange
6”, 150 lb
flange
6”, 150 lb
flange
Dimensions
in (cm)
except as
noted
F. Tray access
door dia.
G. Pump
suction
RDTVRDTV150-10-2-* 150-15-3-*
RDTVRDTV150-20-4-* 150-25-5-*
RDTV150-30-6-*
Make-up water control
High level control
Low level control
Vacuum breaker
Temperature gauge
Pressure gauge
1½” NPT vent
1” NPT chemical port
1” NPT drain
1” NPT sample port
1” NPT additional port
Gauge glass
RDTVRDTV150-35-7-* 150-40-8-*
RDTVRDTV150-45-9-* 150-50-10-*
H. Pump bypass
I. Hi-temp
condensate
return
2 NPT
2 NPT
2 NPT
2 NPT
2 NPT
2 NPT
3 NPT
3 NPT
3 NPT
3 NPT
2”, 150 lb
flange
2”, 150 lb
flange
2”, 150 lb
flange
3”, 150 lb
flange
3”, 150 lb
flange
3”, 150 lb
flange
3”, 150 lb
flange
3”, 150 lb
flange
3”, 150 lb
flange
3”, 150 lb
flange
J. Steam
connection
4”, 150 lb
flange
4”, 150 lb
flange
4”, 150 lb
flange
6”, 150 lb
flange
6”, 150 lb
flange
6”, 150 lb
flange
8”, 150 lb
flange
8”, 150 lb
flange
8”, 150 lb
flange
8”, 150 lb
flange
K. Water
connection
2”, 150 lb
flange
2”, 150 lb
flange
2”, 150 lb
flange
3”, 150 lb
flange
3”, 150 lb
flange
3”, 150 lb
flange
4”, 150 lb
flange
4”, 150 lb
flange
4”, 150 lb
flange
4”, 150 lb
flange
4
(10)
4
(10)
4
(10)
4
(10)
4
(10)
4
(10)
4
(10)
4
(10)
4
(10)
4
(10)
L. Base
height
Sample Specification—Roth Deaerator
DEAERATOR:
A. The deaerator shall be a Roth style “RDTV” deaerator which guarantees oxygen removal to 0.005 cc/l (7 ppb) or less and
carbon dioxide removal to a zero measurable level in the effluent throughout all load conditions between 0% and 100% of
rated capacity. The deaeration process will take place in a 5-15 psig steam environment that will heat the water to 228250°F requiring a pressurized vessel. The deaerator shall be manufactured in strict accordance with the ASME Section VIII,
Div. 1 code and bear the ASME stamp for a maximum working pressure of 50 psig at 300ºF. An atmospheric deaerator is not
acceptable. A minimum of
1/16” corrosion allowance shall be added to the ASME calculated material thickness for
heads and shell and will be noted on the ASME data report (form U-1). The deaerator is to be of the vertical design with a
vessel of _____” diameter x _____” high setting less than 18” from the floor.
B. The deaerator is to be of the tray type design. Spray type deaerators are not acceptable. Flow of steam shall be such that
the steam entering the heater first comes in contact with the hottest water which is leaving the last row of trays and then
proceeds upward through the tray stack in a counter-flow fashion. The water to be deaerated will enter the vessel through a
stainless steel spray tube. The spray tube will disperse water into a 304L stainless steel box that is sealed so that escaping
gasses can not come in contact with the vessel walls. The gases escape through a 304L vent condenser pipe on top of the
tray box that extends out the top of the vessel. The spray tube directs the water into sections of a 304L stainless steel vent
welded on top of the tray box. The water falls downward from the vent condenser and spreads over the stainless steel trays
and, after deaeration, falls into the storage area. The stainless steel (304L) trays will be removable through a minimum 20”
dia. hinged tray access door. Each tray shall weigh no more than 30 lbs. for easy handling and inspection and shall be of
welded construction. Rivets are not acceptable. The deaerator will be designed so that undeaerated water will only come
into contact with stainless steel components.
C. The tray type deaerator is to be fully trimmed by the manufacturer including the following items:
1. Low Level Control: An external float type control is to be supplied to monitor a low level condition. A low level shall
ring an alarm bell and light a red light on the control panel notifying the operator. The control shall also shut off the
deaerator pumps protecting them from harm.
2. High Level Control: An external float type control is to be supplied to monitor a high level condition. A high level shall
ring an alarm bell and light a red light on the control panel notifying the operator. The high level control shall be
activated before the water reaches the overflow level.
3. Overflow Trap: A mechanical self-contained external float type overflow trap shall be supplied to overflow the water in
the storage area before flooding the deaerator. The overflow trap body is to be constructed of cast iron. Inside the body,
a stainless steel ball float automatically operates a double-seated brass valve. The cast iron body is to be bolted
together in order to take apart for inspection/maintenance of the valve assembly. A butterfly valve is to be supplied
between the deaerator and the trap for inspection without having to shut down the deaerator.
4. Make-up Water Assembly: An electric water level controller and make-up water valve is to be supplied to monitor the
level of water storage in the deaerator and add make-up water when necessary for continued operation. The level to
activate the water valve shall be field adjustable to match desirable operating conditions. The water valve shall be
suitable for operation with a pressure differential of up to 150 psi. The valve shall default to a closed position when deenergized and be a modulating or slow closing valve in order to reduce or eliminate water hammer. The valve shall be
factory piped with a 3-valve bypass assembly and strainer.
5. Pressure Reducing Valve: A self-contained pilot operated valve shall be supplied when necessary to reduce the
available steam pressure to the operating pressure of the deaerator (5-15 psig). The valve is to be shipped loose for
field installation. Relief valve(s) acceptable for ASME service shall also be supplied. The relieving capacity of the
valves shall be greater than the maximum capacity of the pressure reducing valve and set to relieve at 50 psig.
6. Vacuum Breaker: A vacuum breaker is to be supplied to release any vacuum in the deaerator during operation.
7. Vent Valve: A manual valve shall be supplied to vent the deaerator. The valve is to have the ability to be field adjustable with a 1/8” drilled orifice to avoid complete shut off capability.
8. Drain Valve: A gate valve is to be supplied and sized the same diameter as the drain connection and be supplied by
the manufacturer.
9. Misc. Gauges: A pressure and temperature gauge shall be supplied and installed by the manufacturer. The gauges
shall be sized suitable for the operation and design range of the deaerator and follow any ASME or local codes and
requirements. A gauge glass shall be supplied and installed to cover the water level range from low level to overflow
level. The gauge glass shall be protected from getting hit by outside objects and be so mounted to protect from getting
broken.
10. Pump Suction: The pump suction shall be sized based on a velocity 3 ft/sec of twice the deaerator capacity. A
separate gate valve, strainer, and flexible connector shall be supplied for each pump.
Roth Tray Type Deaerators
Roth tray type
deaerators remove
CO2 from feedwater
completely and reduce
oxygen to .005 cc/l.
Available with capacities up to 50,000
pounds per hour, Roth
tray type deaerators
come completely
packaged with all
standard accessories
and trim. Internal
surfaces which come in
contact with
undeaerated water are
stainless steel.
Undeaerated water
and corrosive gases never come in contact with the
deaerator shell.
A complete line of boiler feed pumps and control
panel packages is available. Custom engineered
systems and larger than standard units are also
available. Consult the factory.
Non-condensable gases (O2, CO 2)
Deaerated water
Condensate return & water make-up
Steam
Roth Deaerator Pumps
Roth pioneering—
The Roy E. Roth Company has been a pioneer in
the industry for over 45 years by developing NPSH
data on its products for use by engineers. In 1954,
it was the first manufacturer of regenerative turbine
pumps to publish NPSH data on individual models.
At that time, the Roy E. Roth Company developed
and published the first NPSH curves on regenerative turbine pumps in a format now used throughout
the industry. It is the only manufacturer of regenerative turbine pumps today with numerous patents
designed to improve the NPSH characteristics of its
pumps.
Roth one-foot NPSH pumps—
The Roth Pump Company, the manufacturing
successor, is the only pump manufacturer in the
world today that offers a line of pumps with full
performance at one-foot NPSH at speeds of both
1750 and 3500 rpm in a range of differential heads
up to 600 feet TDH and capacities up to 190 GPM.
All Roth pumps in this bulletin are guaranteed to
deliver the full-rated capacity of water to the boiler.
Roth one-foot NPSH pumps were originally
developed to pump 230° F deaerated water from
the deaerator to the boiler. Now the original design
has been improved to include high-capacity models
fully functional at one-foot NPSH.
Standard equipment—
• All deaerators are constructed to ASME Section VIII, Div. 1 for
50 psig, 300° F
• Easily accessible manways and access doors for internal
inspection and servicing
• Standard storage capacity: 10 minutes of operation. Optional
larger storage capacities available
• Structural steel stand and pump platform
• High and low level control alarms
• External make-up water level control (field adjustable)
• Make-up water valve with three-valve bypass
• Pilot operated steam pressure reducing valve (when required)
• Relief valve sized for full output of the pressure reducing valve
set at 50 psig
• Manual vent valve(s) with properly sized orifice in gate
• Vacuum breaker
• Pressure gauge and thermometer
• Overflow trap sized to relieve full capacity of deaerator
• Full range sight glass
• Drain valve
Roth Pump Company
P.O. Box 4330, Rock Island, IL 61204 U.S.A.
Toll-Free: 1.888.444.ROTH (1.888.444.7684)
309.787.1791 . Fax: 309.787.5142
www.rothpump.com
Contact your Authorized Roth Representative Today!
3070.40.2603
© 2000, Roth Pump Company
Printed in USA