Applications Flowlines, manifolds, pipeline

Comments

Transcription

Applications Flowlines, manifolds, pipeline
Applications
Flowlines, manifolds, pipeline transmission and
distribution, pressure regulation and metering runs,
underground storage, waterflood and general pipeline
service in onshore, offshore and subsea locations. Also
may be used as sphere launcher or receiver when fitted
with a SPHERE-LOCK ball.
Product Description
Features
• Through conduit, full round opening
• Bubble-tight sealing from zero to full rated pressure
• Upstream and downstream sealing under any
operating conditions – full block and bleed capability
• Metal-to-metal primary seal – protected ‘O’ ring
secondary seal
• Self-cleaning ball
• Bolted construction permits disassembly on site
• Double stem seals - replacement possible with pipeline under pressure subject to operational
procedures and/or risk assessment
• Integral mechanical stops
• Low operating torque assured by the design of the trunnion mounted
• Both upstream and downstream seat seals capable of sealing upstream pressure
The CORT C-B5 Ball Valve uses a three piece, bolted body design manufactured from ring rolled
forgings. The cast or forged ball features integral, external trunnions which turn in bearings mounted in
bearing retainer blocks. These bearing retainers are precision located between the ball valve closures
which are then able to resist the pressure loading on the
ball.
The method of supporting the ball in a trunnion mounted
ball valve is of little importance in cases when the valve is
small and the pressures are low. However, the forces
generated in a large valve closed against high pressure are
enormous and they create a major challenge for the valve
designer. The magnitude of the stresses and deflections
generated by these forces depend upon the design
employed for supporting the ball. If stresses are too high
some form of valve failure will occur, either initially or at
some time during service. If deflections are excessive, then
the valve operating torque will be too high and the bearings
may be unevenly loaded resulting in premature failure.
In some designs of trunnion mounted ball valves, trunnions
project from inside the valve body into sockets in the ball.
These trunnions are therefore subjected to a couple which
could be massive and result in unacceptable deflections together with high stress levels in the valve body
which is already subject to pressure forces. In other designs, the valve stem is used as a trunnion which
creates the additional problem of possible stem leaks due to the application of side loads to the stem
seals.
The design used in the CORT C-B5 for supporting the ball is not the lowest cost but it is the most elegant
and effective engineering solution. Both trunnions and the ball are a single component, thus eliminating
the problems associated with a highly stressed joint. The trunnions are as close together as possible
(normally within the ball spherical diameter) ensuring that the bending moment is minimised and applied
to only the stiffest part of the ball. The trunnions are short in relation to their diameter and primarily
subject only to shear stress. The force is transmitted into the valve closures via the bearing retainers,
which are put into compression. The result is that for practical purposes, bending is eliminated from these
components and the deflections produced are minimal. Mating surfaces remain square and parallel to
each other so that stress distributions are uniform and stress levels remain low. The stem is not rigidly
attached to the upper trunnion and therefore, although it can apply torsion to the ball, no side thrust is
transmitted from the ball onto the stem seals.
The seat design assures bubble-tight independent upstream and downstream sealing. When the ball is in
the closed position, sealing is achieved by both a primary metal-to-metal seal and a secondary, protected
‘O’ ring seal. The inner lip of the metal seat and the seal ride on the polished surface of the electroless
nickel coated ball. The force for the initial seal, at low pressure differential or in vacuum conditions, is
provided by helical springs spaced around the seat circumference. As line pressure increases, it acts on
the upstream seal producing a proportional force in addition to the spring loading to force the upstream
seal tightly against the ball. In its standard form, the CORT C-B5 is designed so that if upstream pressure
should reach the downstream seat then it will also be forced against the ball creating a bubble-tight seal.
In this way, the CORT C-B5 provides a double barrier sealing the downstream from upstream pressure. If
the valve is installed in a piping system where flow can reverse and the other side of the valve becomes
the upstream then the double barrier seal continues to be effective.
Range of Supply
Bore Sizes - 6" - 48"
Pressure Ratings - ANSI class 150 to 2500
Standard Features
Block and Bleed
With the ball in the closed position, the valve body may be drained or vented. In cases when the pipeline
is pressurised, zero leakage from the body drain confirms the integrity of the seat seals. Alternatively, if
no pipeline pressure is available, it is still possible to check seat seal integrity by applying pressure to one
of the body connections.
Stem Seals
The stem is sealed by means of two ‘O’ rings. If leakage should ever occur through both stem seals, the
secondary ‘O’ ring can be replaced with the valve in the line, under pressure. When the valve is in the
closed position with the body pressure bled off to atmosphere, it is possible to remove the gland for
replacement of both primary and secondary stem ‘O’ rings. The stem can also be removed and replaced
if necessary.
Mechanical Stops
The CORT C-B5 design includes integral mechanical stops. This feature is essential for accurately setting
the travel limits on a power actuator when it is site fitted to a valve already installed in a pipeline.
Low Operating Torque
The ball trunnions revolve in PTFE impregnated metal sleeve bearings which do not require lubrication.
Due to the characteristics of these bearings and the design employed for supporting the ball, the CORT
C-B5 can be operated by applying a relatively low input torque. This ensures fast operation, and permits
the use of smaller, less expensive manual or power operators.
Field Disassembly
The CORT C-B5 is designed to permit easy disassembly in the field, for the purpose of inspecting or
replacing parts. Prior to reinstallation in the pipeline, even if no test blanks are available, all seals may be
simultaneously tested by pressuring the valve body.
Alternatively, CORT offer a factory refurbishing service which ensures that valves are returned to
customers in an as-new condition with a full warranty.
Optional Features
Emergency Seal
Under throttling conditions or if excessive debris is present then the possibility of leakage is greater than
when a valve is used for normal on-off service. All valves are designed not to require sealants. However,
if the metal-to-metal primary seal and the secondary ‘O’ ring seal are damaged, an emergency shut-off
may be obtained with a sealant injected into a specially designed groove in the seat ring assembly. A
design of emergency stem seal is also available.
Operating Extensions
Extensions can be supplied to enable underground valves to be operated from ground level. These are
extended yoke and drive tube design and are watertight for buried service.
Extended Blow-Down Valves
C-B5 valve body cavities can be vented to atmosphere and completely drained down by the optional
extended body drain valve. This operation may be performed with the line under pressure and the ball in
closed position. The connection between the valve and the pipework may be threaded, flanged or welded
according to customer specification.
Transition Pieces
Weld-end valves can be supplied with a short length of pipeline pipe welded to each end ensuring that
they can be installed with standard pipeline welds.
Sphere-Lock Ball
The CORT C-B5 can be fitted with a SPHERE-LOCK ball which is blind and has a cavity sized to suit
pipeline spheres. This converts the valve into a SPHERE-LOCK Mechanical Transfer Chamber suitable
for pigging and bypass duty. A SPHERE-LOCK launch station followed by a SPHERE-LOCK receive
station may be installed anywhere in the pipeline with additional SPHERE-LOCK valves used to bypass
pumps or compressors if required.
Body Materials
Body
Closures
Body Bolting
Gland Plate
Standard
Carbon Steel
ASTM A350-LF2 Modified
(50000psi min yield)
Carbon Steel
ASTM A350-LF2 Modified
(50000psi min yield)
ASTM A193 Grade B7 Studs
ASTM A194 Class 2H Nuts
Carbon Steel
BS 4360 Grade 43A
BS 4360 Grade 50B
ASTM A350-LF2 Modified
(50000psi min yield)
Options
Stainless Steels
Weld Overlayed
Epoxy/Phenolic Linig
Stainless Steels
Weld Overlayed
Epoxy/Phenolic Lining
Low Temperature Alloy Steel
Stainless Steel
Stainless Steels
Weld Overlayed
Epoxy/Phenolic Lining
Standard
Carbon Steel
BS 4360 Grade 43A
BS 4360 Grade 50D
Steel backed PTFE Type DU
Electroless Nickel Coated Carbon Steel
Electroless Nickel Coated Carbon Steel
BS 970 070M20
Electroless Nickel Coated Carbon Steel
ASTM A350-LF2 Modified
(50000psi min yield)
Electroless Nickel Coated Cast Steel
ASTM A148 Grade 90-60
Electroless Nickel Coated Carbon Steel
BS 970 070M20
BS 970 080M40
Options
Stainless Steels
Weld Overlayed
Epoxy/Phenolic Lining
Fibreglide Resin
Trim Materials
Bearing Retainers
Bearings
Thrust Washers
Ball
Seat Rings
Seat Springs
‘O’ Ring Seals
Stem
Drive Pins
18/8 Austenitic Stainless Steel
Specially compounded Nitrile synthetic
rubber
Nylon PA12G
Electroless Nickel Coated Carbon Steel BS
970 220M07
BS 970 070M20
Heat Treated Alloy Steel
BS 970 709M40
Other Options
• Hardness controlled materials (to suit NACE MR-01-75)
• Spring Energised Polymer Seals
Stainless Steels
Weld Overlayed
Hard Faced (Tungsten Carbide or
Stellite)
Stainless Steels
Weld Overlayed
Hard Faced (Tungsten Carbide or
Stellite)
Inconel X750
Viton
HNBR
Stainless Steels
Stainless Steels
Dimensional Outline Drawing
Weights and Dimensions Class 150
Valve Size
(inch)
A
B
C
(R.F)
C
(W.E)
D
Weight (Kg)
WE
RF
6
162
152
394
457
295
202
193
8x6x8
162
152
457
521
295
227
216
8
203
203
457
521
375
352
330
10 x 8 x 10
203
203
533
559
375
375
352
10
248
254
533
559
419
500
477
12 x 8 x 12
248
254
610
635
419
534
500
12
289
305
610
635
460
705
659
16 x 10 x 16
289
305
762
838
460
773
727
14
308
337
686
762
470
864
818
16
346
387
762
838
508
1023
977
20 x 16 x 20
346
387
914
991
508
1125
1057
18
387
438
864
914
591
1443
1364
20
429
489
914
991
632
1920
1841
24 x 20 x 24
429
489
1067
1143
632
2057
1977
22
464
540
991
1092
670
2352
2284
24
514
591
1067
1143
708
2807
2727
30 x 24 x 30
514
591
1295
1397
708
2920
2841
26
546
635
1143
1245
762
3523
3443
28
587
686
1245
1346
810
4045
3943
30
629
737
1295
1397
848
4818
4727
36 x 30 x 36
629
737
1524
1727
848
5000
4909
32
664
781
1372
1524
879
5489
5375
34
699
832
1473
1626
956
6705
6580
36
730
876
1524
1727
991
7614
7568
40
806
978
1753
1956
1064
10273
9773
42
841
1022
1854
2083
1105
12114
11514
48
972
1181
2134
2388
1283
18364
17932
Weights and Dimensions Class 300
Valve Size
(inch)
A
B
C
(R.F)
C
(W.E)
D
Weight (Kg)
WE
RF
6
162
152
403
457
295
220
193
8x6x8
162
152
502
521
295
250
216
8
203
203
502
521
375
375
330
10 x 8 x 10
203
203
568
559
375
409
364
10
248
254
568
559
419
534
466
12 x 8 x 12
248
254
648
635
419
580
511
12
289
305
648
635
460
761
659
16 x 10 x 16
289
305
838
838
460
841
739
14
308
337
762
762
470
898
818
16
346
387
838
838
540
1295
1068
20 x 16 x 20
346
387
991
991
540
1466
1261
18
394
438
914
914
591
1705
1500
20
429
489
614
991
632
2080
1841
24 x 20 x 24
429
489
1143
1143
632
2216
1977
22
470
540
1092
1092
670
2611
2330
24
514
591
1143
1143
708
3080
2727
30 x 24 x 30
514
591
1397
1397
708
3193
2841
26
546
635
1245
1245
762
3875
3443
28
587
686
1346
1346
832
4773
3955
30
629
737
1397
1397
876
5580
4966
36 x 30 x 36
629
737
1727
1727
870
6091
5489
32
664
781
1524
1524
902
6239
5614
34
699
832
1626
1626
956
7364
6580
36
730
876
1727
1727
991
8420
7568
40
806
978
1956
1956
1064
11000
9773
Weights and Dimensions Class 600
Valve Size
(inch)
A
B
C
(R.F)
C
(W.E)
D
6
168
152
559
559
562
295
250
8x6x8
168
152
660
660
664
295
307
8
210
203
660
660
664
375
443
10 x 8 x 10
210
203
787
787
791
375
534
10
254
254
787
787
791
400
705
12 x 10 x 12
254
254
838
838
841
400
886
12
295
305
838
838
841
441
920
16 x 12 x 16
295
305
991
991
994
441
1364
14
314
337
889
889
892
502
1227
16
352
387
991
991
994
540
1534
20 x 16 x 20
352
387
1194
1194
1200
540
1966
18
403
438
1092
1092
1095
591
2136
20
438
489
1194
1194
1197
632
2636
24 x 20 x 24
438
489
1397
1397
1407
632
3432
22
476
540
1295
1295
1305
670
3364
24
514
591
1397
1397
1407
733
3955
30 x 24 x 30
514
591
1651
1651
1664
733
4727
26
556
635
1448
1448
1461
784
5148
28
568
686
1549
1549
1562
832
6057
30
629
737
1651
1651
1664
870
6489
36 x 30 x 36
629
737
2083
2083
2099
870
7375
32
664
781
1778
1778
1794
902
7818
34
708
832
1930
1930
1946
956
8500
36
743
876
2083
2083
2099
991
10636
* Please refer to Robert Cort Valves Ltd
Weight (Kg)
WE
RF
Weights and Dimensions Class 900
Valve Size
(inch)
A
B
C
(R.F)
C
(W.E)
C
(R.T.J)
D
6
175
150
610
610
613
343
390
295
8x6x8
175
150
737
737
740
343
480
345
8
210
201
737
737
740
352
560
435
10 x 8 x 10
210
201
838
838
841
352
695
570
10
254
252
838
838
841
400
820
640
12
295
303
965
965
968
473
1230
1000
14
318
322
1029
1029
1038
508
1610
1265
16
362
373
1130
1130
1140
546
2010
1595
20 x 16 x 20
362
373
1321
1321
1334
546
2575
1855
18
413
423
1219
1219
1232
610
2805
2215
20
454
471
1321
1321
1334
686
3460
2740
24 x 20 x 24
454
471
1549
1549
1568
686
4500
3155
24
530
570
1549
1549
1568
762
5500
4155
30 x 24 x 30
530
570
1880
1880
1902
762
6595
4785
26
587
617
1651
1651
1673
835
7160
5845
30
683
712
1880
1880
1902
997
9545
7500
36 x 30 x 36
683
712
2286
2286
2315
997
10730
8045
36
813
855
2286
2286
2315
*
12185
9730
* Please refer to Robert Cort Valves Ltd
Weight (Kg)
WE
RF
Weights and Dimensions Class 1500
Valve Size
(inch)
A
B
C
(R.F)
C
(W.E)
C
(R.T.J)
D
6
213
144
705
705
711
375
580
445
8
256
192
832
832
841
414
750
545
10
319
239
991
991
1000
510
1195
840
12
352
287
1130
1130
1146
541
1655
1210
14
413
315
1257
1257
1276
1276
2785
2045
16
467
360
1384
1384
1407
664
4000
3070
18
508
406
1537
1537
1559
793
*
*
20
564
454
1664
1664
1686
869
*
*
24
*
546
*
*
1972
*
*
*
30
*
686
*
*
*
*
*
*
* Please refer to Robert Cort Valves Ltd
Typical Section View & Component List
Weight (Kg)
WE
RF
Applicable Standards
• API 6D Pipeline Valves
• BS 6755 Pipeline Valves
• ASME/ANSI B16.5 Pipe Flanges and Flanged Fittings (Standard for valve sizes up to and including
24")
• ASME/ANSI B16.47 Large Diameter Steel Flanges
• MSS-SP44 Steel Pipe Flanges (Standard for valve sizes 26" and above)
• API 605 Large Diameter Carbon Steel Flanges
• BS 1560 Specification for Steel Flanges
• BS 3293 Carbon Steel Pipe Flanges
• Additional standards dependent on customer specifications
ISO 9001 Quality Assured Product Notes
• Not certified dimensional drawings
• Other sizes/classes including 40” CL900, 56" CL150-600, 24” & 30” CL1500 and 8”-20” CL2500
available
All dimensions and weights are approximate. The information on this data sheet is accurate to the best of
Robert Cort’s knowledge; however we reserve the right to alter the product specification at any time.