Table of Contents
Advertisement
6 Using the product
6.2.5.
Liquid gas (DVGW TRF 2012)
CAUTION
Avoid damage to the instrument due to high pressure!
> The test pressure of 1.2 bar must not be exceeded.
There are 3 different test types to choose from:
•
Pressure test
During the pressure test, the liquid gas pipes are tested at a
higher pressure than the normal operating pressure. This
means that the material is exposed to a greater load. The
pressure test detects weaknesses and shows up any material
defects.
Installed pressure controllers and gas meters must be
dismantled before the pressure test. The pressure test is
carried out before commissioning.
Pressure testing of liquid gas pipelines must be carried out with
air or nitrogen, taking equipment accessories into account.
However, it can also be carried out using water as the test
medium. According to the TRF (Germany), the pressure during
the pressure test must be 1.1 times the permissible pressure
(determined by the SSV triggering pressure), but at least 1 bar.
A pressure drop is not permissible after expiry of the stability
time and measurement period.
•
Main test
The main test (using air or inert gas, e.g. CO2 or N2) is carried
out immediately before commissioning. It is used as a tightness
test (acceptance test) on newly laid or renovated pipes. The
test includes all pipelines up to the closed instrument
connectors of the gas appliances.
Immediately prior to commissioning and following the pressure
test, all pipelines, going as far as the adjustment elements of
the instrument, must be tested for tightness using air at an
overpressure of 100 mbar (TRF, Germany).
50
Liquid gas pipes must be subjected to a pressure test and a
main test before corrosion protection is applied, before
plastering or any other covering work and before a liquid
gas vessel is commissioned (filled). It must be certified that
the pipelines have been properly constructed.
Advertisement
Table of Contents
