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Pressure measurement

Tightness test

Test of gas pipes

2

DVGW (German Technical and Scientific Association for Gas and Water) TRGI (German Technical Rules for Gas Installations) defines the rules for all pressure tests on gas pipes (underground pipes, aboveground outdoor pipes, indoor pipes). Affected pipe sections must be isolated from the gas-carrying pipe. After the test has been

performed and gas admitted, the final test is carried out using leak detectors (e.g. GSP or CAPBs® GS 10). All connection points, for example at the gas meter, the pressure controller or the gas-consuming equipment, are tested for leaks.

Load test

Pressure test

Time of test

New installations prior to painting, insulation, plastering or other types of covering

Pipe parts to be tested

Pipes without fittings or with fittings if the nominal pressure rating of such fittings is at least as high as the test pressure. Pipe openings must be closed with metallic components; connection of gas-carrying pipes is not permitted. Connection points without corrosion protection.

Time of test

Pipe parts to be tested

Pipes with fittings

Test medium

Air or inert gas (N2, CO2)

Test pressure

Max. 50 mbar System < 100 l: 10 min System > 100/200 l: 30 min System > 200 l: 60 min Approx. 5 minutes

Test medium

Air or inert gas (N2, CO2)

Test pressure

1 bar

Temperature compensation

Test duration

10 min

Test duration

Evaluation of serviceability/ determination of amount of gas leakage Pipe parts to be tested

Pipes including fittings, but without gas-consuming equipment, control and safety equipment.

Test medium

Air or inert gas (N2, CO2)

Test pressure

Operating pressure, usually 23 mbar

Test duration

Min. 1 min, max. 10 min

Test result

Amount of leakage

Serviceability

0 l/h

Tight

< 1 l/h

Unlimited

≥ 1 l/h and < 5 l/h

Reduced

≥ 5 l/h

None

New installations immediately prior to blowing in of the gas if the tightness test or the evaluation of serviceability has not been performed immediately before

Tightness test Time of test

New installations prior to painting, insulation, plastering or other types of covering, decommissioned pipes prior to re-commissioning, decommissioned pipes

Pipe parts to be tested

Freely accessible pipes with fittings, however, without gas-consuming equipment, control and safety equipment. Connection points without corrosion protection.

Test medium

Air or inert gas (N2, CO2)

Test pressure

150 mbar

Temperature compensation

System < 100 l: 10 min System > 100/200 l: 30 min System > 200 l: 60 min

Test duration

System < 100 l: 10 min System > 100/200 l: 20 min System > 200 l: 30 min

Test of drinking water systems Pipe parts to be tested

Newly laid pipes with fittings

Test medium

Air, inert gas (N2, CO2) or water

1. Tightness test*

2. Strength test*

Test pressure

150 mbar

≤ DN 50: 3 bar > DN 50: 1 bar

Temperature compensation

30 min

-

Test duration System < 100 l: 120 min Each additional 100 l: +20 min * Specifications for test medium air

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10 min

The tightness test with water may only be performed by means of hygienic components and with filtered drinking water. In the case of an extended duration between the pressure test and commissioning, a dry tightness test must be performed to avoid pollution/microbial contamination of the system. The test is carried out as per ZVSHK (German Central Association of the HVAC Industry) specifications.

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AFRISO Portable Measuring Instruments 2019/20  

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