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Hydrostatic Test Criteria

API 598

Face-to-Face Dimension Comparison
DN 100 AND CLASS 1500
DN > 100 AND CLASS 600		 Required Required Optional
DN 100 AND CLASS > 1500
DN > 100 AND CLASS > 600		 Required Required Required
Valve Type Shell Low-Pressure closure High-Pressure closure
Class Pressure
( Bar )		 Pressure
( PSI )		 Duration Pressure
( Bar )		 Pressure
( PSI )		 Duration Pressure
( Bar )		 Pressure
( PSI )		 Duration
Ductile iron 150 26 400 ≤50 15 4 to 7 60 to 100 ≤50 15 110% of max
allowable
pressure
at 38℃		 110% of max
allowable
pressure
at 38℃		 ≤50 15
300 66 975
Cast Iron ( DN 50 to 300 ) 125 25 350 65 to 150 60 65 to 150 60 65 to 150 60
Cast Iron ( DN 350 to 1200 ) 125 19 265
Cast Iron ( DN 50 to 300 ) 250 61 875 200 to 300 120 200 to 300 120 200 to 300 120
Cast Iron ( DN 350 to 1200 ) 250 37 525
Steel - flange 150 to 2500 ASME B 16.34 ASME B 16.34 ≥350 300 ≥350 120 ≥350 120


Face-to-Face Dimension Comparison
Maximum Allowable Leakage Rates for Closure Tests
  ≤50 65 80 100 125 150 200 250 300 350 400 450 500 600 650 700 750 800 900 1000 1050 1200
All Resilient Seated Valves 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0
Metal Seated Valves  
　　- Liquid Test ( drops/min ) 0 5 6 8 10 12 16 20 24 28 32 36 40 48 52 56 60 64 72 80 84 96
　　- Gas Test ( bubbles/min ) 0 10 12 16 20 24 32 40 48 56 64 72 80 96 104 112 120 128 144 160 168 192



ASME B 16.34

Face-to-Face Dimension Comparison
Pressure Testing in accordance with ASME B 16.34
Shell test Closure test Optional Gas Closure test
Pressure ( Bar ) Pressure ( PSI ) Duration Pressure
( Bar )		 Pressure
( PSI )		 Duration Pressure
( Bar )		 Pressure
( PSI )		 Requisite
No less than 1.5 times the 38 C
pressure rating,
rounded off to the next higher 1 bar
increment. 		No less than 1.5
times the 100 F
pressure rating,
rounded off to the
next higher 25 psi
increment. 		NPS 2 15 No less than 1.1
times the 38 C
pressure rating,
rounded off to the
next higher 1 bar
increment. 		No less than 1.1
times the 100 F
pressure rating,
rounded off to the
next higher 25 psi
increment. 		NPS≤2 15 No less than
5.5 bar		 No less than
80 psi		 NPS ≤ 4 Pc ≤ 2500
2½ ≤ NPS ≤8 60 2½ ≤ NPS ≤8 30
10 ≤ NPS 180 10 ≤ NPS ≤ 18 60 NPS ≤ 12 Pc ≤ 300
20 ≤ NPS 120