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depressurizing or venting of the component. For large

vessels or systems where one or more gages are specified

or required, a recording type gage is recommended, and it 

may be substituted for one of the two or more indicating

type gages.

(c)  When other types of gage(s) are required by an ap-

plicable Mandatory Appendix, they may be used in con-

junction with or in place of dial indicating or recording

type gages.

T-1040 MISCELLANEOUS REQUIREMENTS

T-1041 Cleanliness

The surface areas to be tested shall be free of oil,

grease, paint, or other contaminants that might mask a

leak. If liquids are used to clean the component or if a hy-

drostatic or hydropneumatic test is performed before

leak testing, the component shall be dry before leak 

testing.

T-1042 Openings

All openings shall be sealed using plugs, covers, sealing

wax, cement, or other suitable material that can be readily

and completely removed after completion of the test.

Sealing materials shall be tracer gas free.

T-1043 Temperature

The minimum metal temperature for all components

during a test shall be as specified in the applicable Manda-

tory Appendix of this Article or in the referencing Code

Section for the hydrostatic, hydropneumatic, or pneu-

matic test of the pressure component or parts. The mini-

mum or maximum temperature during the test shall not 

exceed that temperature compatible with the leak testing

method or technique used.

T-1044 Pressure/Vacuum (Pressure Limits)

Unless specified in the applicable Mandatory Appendix

of this Article or by the referencing Code Section, compo-

nents that are to be pressure-leak tested shall not be

tested at a pressure exceeding 25% of the Design

Pressure.

T-1050 PROCEDURE

T-1051 Preliminary Leak Test

Prior to employing a sensitive leak testing method, it 

may be expedient to perform a preliminary test to detect 

and eliminate gross leaks. This shall be done in a manner

that will not seal or mask leaks during the specified test.

T-1052 Test Sequence

It is recommended that leak testing be performed be-

fore hydrostatic or hydropneumatic testing.

T-1060 CALIBRATION

T-1061 Pressure/Vacuum Gages.(a) All dial indicating and recording type gages used

shall be calibrated against a standard deadweight tester,

a calibrated master gage, or a mercury column, and recal-

ibrated at least once a year, when in use, unless specified

differently by the referencing Code Section or MandatoryAppendix. All gages used shall provide results accurate to

within the Manufacturer’s listed accuracy and shall be re-

calibrated at any time that there is reason to believe they

are in error.

(b) When other than dial indicating or recording type

gages are required by an applicable Mandatory Appendix,

they shall be calibrated as required by that Mandatory

Appendix or referencing Code Section.

T-1062 Temperature Measuring Devices

When temperature measurement is required by the re-

ferencing Code Section or Mandatory Appendix, the de-

vice(s) shall be calibrated in accordance with the

requirements of that Code Section or Mandatory

Appendix.

T-1063 Calibration Leak Standards.T-1063.1 Permeation Type Leak Standard. This

standard shall be a calibrated permeation type leak 

through fused glass or quartz. The standard shall have a

h e l iu m l e a k a ge r a t e i n t h e r a n g e o f 1 × 1 0−6 to

1 × 10−10std cm3/s. (1 × 10−7 to 1 × 10−11 Pa m3/s).

T-1063.2 Capillary Type Leak Standard.  Thisstandard shall be a calibrated capillary type leak through

a tube. The standard shall have a leakage rate equal to or

smaller than the required test sensitivity times the actual

percent test concentration of the selected tracer gas.

T-1070 TEST

See applicable Mandatory Appendix of this Article.

T-1080 EVALUATION

T-1081 Acceptance Standards

Unless otherwise specified in the referencing Code Sec-

tion, the acceptance criteria given for each method or

technique of that method shall apply. The supplemental

leak testing equations for calculating leakage rates for

the method or technique used are stated in the Mandatory

Appendices of this Article.

T-1090 DOCUMENTATION

T-1091 Test Report

The test report shall contain, as a minimum, the follow-

ing information as applicable to the method or technique:

(a) date of test 

(b) certified level and name of operator

(c)   test procedure (number) and revision number

(d) test method or technique

(e)   test results

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