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 NB3226 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 NB3226 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 PG99 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 forcedflow 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 systemdesign 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 systemdesign pressure.
1. Boiler external piping must be hydrostatic tested in accordance with PG99 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 forcedflow 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 systemdesign 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 systemdesign pressure.