Technical Information

API Trim Chart

API Trim FamilyAPI Trim No.Material TypeNominal TrimStemDisc/Wedge SurfaceSeat SurfaceAcceptable API Trim Alternatives
Martensitic Stainless Steel1*13Cr410410 SSF6410 SS
Martensitic Stainless Steel813Cr410 Hardfaced410 SSF6Stellite 65
Martensitic Stainless Steel513Cr410 Full Hardfaced410 SSStellite 6Stellite 6
Austenitic Stainless Steel1018Cr-8Ni-Mo316316 SS316 SS316 SS12 or 16
Austenitic Stainless Steel1218Cr-8Ni-Mo316 Hardfaced316 SS316 SSStellite 616
Austenitic Stainless Steel1618Cr-8Ni-Mo316 Full Hardfaced316 SSStellite 6Stellite 6
Monel™9Ni-Cu AlloyMonelMonelMonelMonel
Monel™11Ni-Cu AlloyMonel HardfacedMonelMonelStellite 6
Alloy 201319Cr-29NiAlloy 20Alloy 20Alloy 20Alloy 2014
Alloy 201419Cr-29NiAlloy 20 HardfacedAlloy 20Alloy 20Stellite 6
Alloy 201819Cr-29NiAlloy 20 Full HardfacedAlloy 20Stellite 6Stellite 6
  • *Trim 1 is listed as obsolete for API 600, and no longer included in API 602
  • Trim 5A and 8A apply Ni-Cr alloy hardfacing instead of typical Co-Cr Stellite 6 hardfacing
  • Trim materials noted are nominal, and data provided in this chart is for informational purposes only. Always consult API to verify information via current API publications and data

API 598 – Pressure Test Requirements

TestSizeASME ClassGateGlobe and Parallel Slide GatePlugCheckFloating BallButterfly & Trunnion Mounted Ball
ShellAllAllRequiredRequiredRequiredRequiredRequiredRequired
BackseatAllAllRequiredRequiredN/AN/AN/AN/A
Low Pressure Closure≤ 4 NPS≤ CL1500RequiredOptionalRequiredOptionalRequiredRequired
Low Pressure Closure≤ 4 NPS> CL1500OptionalOptionalOptionalOptionalRequiredOptional
Low Pressure Closure> 4 NPS≤ CL600RequiredOptionalRequiredOptionalRequiredRequired
Low Pressure Closure> 4 NPS> CL600OptionalOptionalOptionalOptionalRequiredOptional
High Pressure Closure≤ 4 NPS≤ CL1500OptionalRequiredOptionalRequiredOptionalOptional
High Pressure Closure≤ 4 NPS> CL1500RequiredRequiredRequiredRequiredOptionalRequired
High Pressure Closure> 4 NPS≤ CL600OptionalRequiredOptionalRequiredOptionalOptional
High Pressure Closure> 4 NPS> CL600RequiredRequiredRequiredRequiredOptionalRequired
High- Pressure Pneumatic Shell TestAllAllOptional*Optional*Optional*Optional*Optional*Optional*

* Optional – Must be specified in purchase order

API Valve Specifications

StandardTitle
API 6DSpecification for Pipeline and Piping Valves
API 594Check Valves: Flanged, Lug, Wafer, and Butt-welding
API 598Valve Inspection and Testing
API 600Steel Gate Valves – Flanged and Butt-welding Ends, Bolted Bonnets
API 602Gate, Globe, and Check Valves for Sizes DN 100 (NPS 4) and Smaller for the Petroleum and Natural Gas Industries
API 603Corrosion-resistant, Bolted Bonnet Gate Valves – Flanged   and Butt-welding Ends
API 607Fire Test for Quarter-turn Valves and Valves Equipped with Non-Metallic Seats
API 608Metal Ball Valves-Flanged, Threaded and Welding Ends
API 609Butterfly Valves: Double-flanged, Lug and Wafer Type
API 622Type Testing of Process Valve Packing for Fugitive Emissions
API 623Steel Globe Valves – Flanged and Butt-welding Ends, Bolted Bonnets
API 624Type Testing of Rising Stem Valves Equipped with Graphite Packing for Fugitive Emissions
API 641Type Testing of Quarter-turn Valves for Fugitive Emissions

ASME Class to Cold Working Pressure

ASME ClassGroup 1.1 Materials
A105, A216 WCB, A350 LF2
Cold Working Pressure (psig)
Group 1.2 Materials
A352 LCC
Cold Working Pressure (psig)
Group 2.2 Materials
A182 F316
Cold Working Pressure (psig)
CL150285290275
CL300740750720
CL4009851,000960
CL6001,4801,5001,440
CL8001,9752,0001,920
CL9002,2202,2502,160
CL15003,7053,7503,600
CL25006,1706,2506,000
  • Cold working pressures include -20°F to 100°F (-29°C to 38°C) – Refer to ASME 34 outside this range
  • CL800 is an intermediate pressure class widely used for socket weld and threaded end connections, as per API 602.

NPS to DN to OD

NPSDNOD (mm)OD (in)
1/4813.70.540
3/81017.10.675
1/21521.30.840
3/42026.71.050
12533.41.315
1-1/43240.61.660
1-1/24048.31.900
25060.32.375
2-1/26573.02.875
38088.93.500
3-1/290101.64.000
4100114.34.500
6150141.36.625
8200219.18.625
10250273.110.75
12300323.912.75
14350355.614.00
16400406.416.00
18450457.018.00
20500508.020.00
24600610.024.00

Pipe Schedule (Inches)

NPSODWall Thickness
STDSCH40XS (XH)SCH80SCH120SCH160XXS (XXH)
1/20.8400.1090.1090.1470.1470.1870.294
3/41.0500.1130.1130.1540.1540.2180.308
11.3150.1330.1330.1790.1790.2500.358
1 1/41.6600.1400.1400.1910.1910.2500.382
1 1/21.9000.1450.1450.2000.2000.2810.400
22.3750.1540.1540.2180.2180.3440.436
2 1/22.8750.2030.2030.2760.2760.3750.552
33.5000.2160.2160.3000.3000.4380.600
3 1/24.0000.2260.2260.3180.3180.636
44.5000.2370.2370.3370.3370.4380.5310.674
66.6250.2800.2800.4320.4320.5620.7190.864
88.6250.3220.3220.5000.5000.7190.9060.875
1010.750.3650.3650.5000.5940.8441.1251.000
1212.750.3750.4060.5000.6881.0001.3121.000
1414.000.3750.4380.5000.7501.0931.406
1616.000.3750.5000.5000.8441.2181.594
1818.000.3750.5620.5000.9381.3751.781
2020.000.3750.5940.5001.0311.5001.969
2424.000.3750.6880.5001.2191.8122.344

ASME B16.25 includes dimensions and tolerances of butt-weld end connections of piping components

Trunnion Ball Valve Types

Valve TypeSeat 1Seat 2
DBBSingle Piston Effect (SPE)Single Piston Effect (SPE)
DIB-1Double Piston Effect (DPE)Double Piston Effect (DPE)
DIB-2Single Piston Effect (SPE)Double Piston Effect (DPE)

Pressure (PSIG) – Temperature Ratings for Class 150 Valves

Temperature304ss316ss317ss254 SMOInconel 600Hastelloy C276Alloy 202205ss2507ssWCBLCC
-29 C / -20 F275275275290290230230290290285290
38 C / 100 F275275275290290230230290290285290
93 C / 200 F230235235260260210200260260260260
149 C / 300 F205215215230230200180230230230230
204 C / 400 F190195195200200190160200200200200
260 C / 500 F170170170170170170150170170170170
316 C / 600 F140140140140140140140140140140140
343 C / 650 F125125125125125125125125125125
371 C / 700 F110110110110110110110110110110
399 C / 750 F95959595959595959595
427 C / 800 F80808080808080
454 C / 850 F65656565656565
482 C / 900 F50505050505050
510 C / 950 F35353535353535
538 C / 1000 F20202020202020
566 C / 1050 F20 (2)202020 (2)20 (2)
593 C / 1100 F20 (2)20 (2)20 (2)20 (2)20 (2)
621 C / 1150 F20 (2)20 (2)20 (2)20 (2)20 (2)
649 C / 1200 F20 (2)20 (2)20 (2)20 (2)20 (2)
677 C / 1250 F20 (2)20 (2)20 (2)20 (2)
704 C / 1300 F20 (2)20 (2)20 (2)20 (2)
732 C / 1350 F20 (2)20 (2)20 (2)20 (2)
760 C / 1400 F20 (2)20 (2)20 (2)20 (2)
788 C / 1450 F20 (2)20 (2)20 (2)20 (2)
816 C / 1500 F15 (2)15 (2)15 (2)15 (2)

(1) At temperatures over 1,000°F, use only when the carbon content is 0.04% or higher.
(2) Flanged-end valve ratings terminate at 1,000°F.
(3) Not to be used over 1,000°F.
(4) Use annealed material only.
(5) Use solution annealed material only.
(6) This steel may become brittle after service at moderately elevated temperatures. Not to be used over 600°F.
(7) Upon prolonged exposure to temperatures above 800°F, the carbide phase of steel may be converted to graphite. Permissible, but not
recommended for prolonged use above 800°F.
(8) Not to be used over 650°F.

Pressure (PSIG) – Temperature Ratings for Class 300 Valves

Temperature304ss316ss317ss254 SMOInconel 600Hastelloy C276Alloy 202205ss2507ssWCBLCC
-29 °C / -20 °F720720720750750600600750750740750
38 °C / 100 °F720720720750750600520750750740750
93 °C / 200 °F600620620745750550465745745680750
149 °C / 300 °F540560560665730520420665665655730
204 °C / 400 °F495515515615705490390615615635705
260 °C / 500 °F465480480580665465360580580605665
316 °C / 600 °F440450450555605440555555570605
343 °C / 650 °F430440440545590430545545550590
371 °C / 700 °F420435435540570420540540530555
399 °C / 750 °F415425425530530410530530505505
427 °C / 800 °F405420420510400410410
454 °C / 850 °F395420420485395320320
482 °C / 900 °F390415415450385230225
510 °C / 950 °F380385385365380135135
538 °C / 1000 °F3553653652403658585
566 °C / 1050 °F325360360155350
593 °C / 1100 °F255305305105325
621 °C / 1150 °F20523523575275
649 °C / 1200 °F16518518570205
677 °C / 1250 °F135145145180
704 °C / 1300 °F115115115140
732 °C / 1350 °F959595105
760 °C / 1400 °F75757575
788 °C / 1450 °F60606060
816 °C / 1500 °F40404040

(1) At temperatures over 1,000°F, use only when the carbon content is 0.04% or higher.
(2) Flanged-end valve ratings terminate at 1,000°F.
(3) Not to be used over 1,000°F.
(4) Use annealed material only.
(5) Use solution annealed material only.
(6) This steel may become brittle after service at moderately elevated temperatures. Not to be used over 600°F.
(7) Upon prolonged exposure to temperatures above 800°F, the carbide phase of steel may be converted to graphite. Permissible, but not
recommended for prolonged use above 800°F.
(8) Not to be used over 650°F.

Torque Conversion Chart

N⋅m lbf-ft lbf-in
Newton Metres
(N⋅m)
Foot Pounds
(lbf-ft)
Inch Pounds
(lbf-in)
53.6944.25
107.3888.51
1511.06132.76
2014.75177.01
2518.44221.27
3022.13265.52
3525.81309.78
4029.5354.03
4533.19398.28
5036.88442.54
5540.57486.79
6044.25531.04
6547.94575.3
7051.63619.55
7555.32663.8
8059708.06
8562.69752.31
9066.38796.56
9570.07840.82
10073.76885.07
10577.44929.33
11081.13973.58
11584.821017.83
12088.511062.09
12592.21106.34
13095.881150.59
13599.571194.85
140103.261239.1
145106.951283.35
150110.631327.61
155114.321371.86
160118.011416.12
165121.71460.37
170125.391504.62
175129.071548.88
180132.761593.13
185136.451637.38
190140.141681.64
195143.821725.89
200147.511770.14
lbf-ft N⋅m lbf-in
Foot Pounds
(lbf-ft)
Newton Metres
(N⋅m)
Inch Pounds
(lbf-in)
56.7860
1013.56120
1520.34180
2027.12240
2533.9300
3040.67360
3547.45420
4054.23480
4561.01540
5067.79600
5574.57660
6081.35720
6588.13780
7094.91840
75101.69900
80108.47960
85115.241020
90122.021080
95128.81140
100135.581200
105142.361260
110149.141320
115155.921380
120162.71440
125169.481500
130176.261560
135183.041620
140189.821680
145196.591740
150203.371800
155210.151860
160216.931920
165223.711980
170230.492040
175237.272100
180244.052160
185250.832220
190257.612280
195264.392340
200271.162400

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