ASME PRESSURE TEST MATRIX

Code

Test type  

Mentioned  Test pressure  minimum

Mentioned Test pressure maximum 

Test pressure minimal hold time

Examination pressure

ASME B31.1
Hydrostatic (1)
1.5 times design
Max allowable test pressure any component or 90 percent of yield
10 minutes
Design pressure
ASME B31.1
Pneumatic
1.2 times design
1.5 times design or max allowable test pressure any componenet
10 minutes
Lower of 100 psig or design pressure
ASME B31.1
Initial service
Normal operating pressure
Normal operating pressure
10 minutes or time to complete leak examination
Normal operating pressure
ASME B31.3
Hydrostatic
1,5 times design (2)
Not to exceed yield stress
Time to complete leak examination but at least 10 minutes
1.5 times design
ASME B31.3
Pneumatic
1.1 times design
1.1 times design plus the lesser of 50 psi or 10 percent of test pressure
10 minutes
Design pressure
ASME B31.3
Initial service (3)
Design pressure
Design pressure
Time to complete leak examination
Design pressure
ASME I
Hydrostatic
1.5 times max allowable working pressure (4)
Not to exceed 90 percent yield stress
Not specified, typically 1 hr
Max allowable working pressure (4)
ASME III
Division 1 Subsection NB
Hydrostatic
1.25 times system design pressure (5)
Not to exceed stress limits of design section NB-3226 or maximum test pressure of any system componenet (5)
10 minutes
Greater of design pressure or 0,75 times test pressure
ASME III
Division 1 Subsection NB
Pneumatic
1.25 times system design pressure (6)
Not to exceed stress limits of design section NB-3226 or maximum test pressure of any system componenet
10 minutes
Greater of design pressure or 0,75 times test pressure
ASME III
Division 1 Subsection NC
Hydrostatic
1.5 times system design pressure
If minimum test pressure exceeded by 6 percent establish limit by the lower of analysis of all test loadings or maximum test pressure of any componenet
10 or 15 minutes per inch of design minimum wall thickness for pumps and Valves
Greater of design pressure or 0,75 times test pressure
ASME III
Division 1 Subsection NC
Pneumatic
1.25 times system design pressure
If minimum test pressure exceeded by 6 percent establish limit by the lower of analysis of all test loadings or maximum test pressure of any componenet
10 minutes
Greater of design pressure or 0,75 times test pressure
ASME III
Division 1 Subsection ND
Hydrostatic
1.5 times system design pressure for completed components, 1,25 times system design pressure for piping systems
If minimum test pressure exceeded by 6 percent establish limit by the lower of analysis of all test loadings or maximum test pressure of any componenet
10 minutes
Greater of design pressure or 0,75 times test pressure
ASME III
Division 1 Subsection ND
Pneumatic
1.25 times system design pressure
If minimum test pressure exceeded by 6 percent establish limit by the lower of analysis of all test loadings or maximum test pressure of any componenet
10 minutes
Greater of design pressure or 0,75 times test pressure

Notes:

1. Boiler external piping must be hydrostatic tested in accordance with PG-99 of ASME Code Section I.

2. ASME B31.3 hydrostatic pressure must be raised above 1.5 times design pressure in proportion to yield strength at test temperature divided by strength at design temperature but not to exceed yield strength at test temperature. Where a vessel is involved whose design pressure is less than the piping and where vessel cannot be isolated, the piping and vessel can be tested together at vessel test pressure provided vessel test pressure is not less than 77 percent of piping test pressure.

3. ASME B31.3 initial service testing permitted only for piping in category D service.

 4. ASME Code Section I hydrostatic test pressure at temperature of at least 70°F (21°C) and examination pressure at temperature less than 120°F (49°C). For a forced-flow steam generator with pressure parts designed for different pressure levels, the test pressure should be at least 1.5 times the maximum allowable working pressure at the superheater outlet but not less than 1.25 times the maximum allowable working pressure of any part of the boiler.

 5. ASME Code Section III, Division 1, subsection NB, test pressure limits defined in section NB3226; also components containing brazed joints and Valves to be tested at 1.5 times system-design pressure prior to installation.

6. ASME Code Section III, Division 1, subsection NB, pneumatic test pressure for components partially filled with water shall not be less than 1.25 times system-design pressure.

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