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ARTICLE 10LEAK TESTING

T-1000 INTRODUCTION

T-1010 SCOPE

This Article describes methods and requirements for

the performance of leak testing.

(a) When a leak testing method or technique of  Article

10 is specified by a referencing Code Section, the leak test 

method or technique shall be used together with  Article

1, General Requirements.

(b) Definition of terms used in this Article are in  Article

1, Mandatory Appendix I, I-121.7, LT— Leak Testing.

(c) The test methods or techniques of these methodscan be used for the location of leaks or the measurement 

of leakage rates.

The specific test method(s) or technique(s) and Glos-

sary of Terms of the methods in this Article are described

in Mandatory Appendices  Mandatory   I through  X  and

Nonmandatory Appendix A as follows:

Mandatory Appendix I — Bubble Test — Direct Pres-

sure Technique

Mandatory Appendix II — Bubble Test — Vacuum Box

Technique

Mandatory Appendix III — Halogen Diode Detector

Probe Test 

Mandatory Appendix IV—

Helium Mass SpectrometerTest — Detector Probe Technique

Mandatory Appendix V — Helium Mass Spectrometer

Test — Tracer Probe Technique

Mandatory Appendix VI — Pressure Change Test 

Mandatory Appendix VIII — Thermal Conductivity De-

tector Probe Test 

Mandatory Appendix IX — Helium Mass Spectrometer

Test — Hood Technique

Mandatory Appendix X — Ultrasonic Leak Detector

Test 

Nonmandatory Appendix A — Supplementary Leak 

Testing Equation Symbols

T-1020 GENERAL

T-1021 Written Procedure Requirements.T-1021.1 Requirements. Leak testing shall be per-

formed in accordance with a written procedure, which

shall, as a minimum, contain the requirements listed in

the applicable Appendices,   paras. I-1021  through

X-1021 and Tables I-1021 through X-1021. The written

procedure shall establish a single value, or range of val-

ues, for each requirement.

T-1021.2 Modification of Requirements.  Article10 contains test techniques; therefore, there are require-

ments that cannot be modified by the organization

through the demonstration process per T-150. Only those

requirements listed in   Tables I-1021  through   X-1021

may be so modified by demonstration.

T-1021.3 Procedure Qualification. When proce-dure qualification is specified by the referencing Code

Section, a change of a requirement in the applicable

Appendix Tables I-1021 through X-1021 identified as an

essential  variable shall require requalification of the writ-

ten procedure by demonstration. A change of a require-

ment identified as a   nonessential   variable does not 

require requalification of the written procedure. All

changes of essential and nonessential elements from

those specified within the written procedure shall require

revision of, or an addendum to, the written procedure.

T-1022 Referencing Code

For the leak testing method(s) or technique(s) speci-

fied by the referencing Code, the referencing Code Section

shall then be consulted for the following:

(a) personnel qualification/certification

(b) technique(s)/calibration standards

(c) extent of examination

(d) acceptable test sensitivity or leakage rate

(e) report requirements

(f)   retention of records

T-1030 EQUIPMENT

T-1031 Gages.

(a) Gage Range. When dial indicating and recording

pressure gage(s) are used in leak testing, they should pre-

ferably have the dial(s) graduated over a range of ap-

proximately double the intended maximum pressure,

but in no case shall the range be less than 11/2 nor more

than four times that pressure. These range limits do not apply to dial indicating and recording vacuum gages.

Range requirements for other types of gages given in an

applicable Mandatory Appendix shall be as required by

that Appendix.

(b) Gage Location. When components are to be pres-

sure/vacuum leak tested, the dial indicating gage(s) shall

be connected to the component or to the component from

a remote location, with the gage(s) readily visible to the

operator controlling the pressure/vacuum throughout 

the duration of pressurizing, evacuating, testing, and

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