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K000000000EJ 023826A0 100714
∆P: Pressure variation between the last instant and the first instant of the test. If the pressure decreased, it
presents a negative value.
Qtest: Is the calculated leakage measured in dm
3
/h according to the conditions under which the test has been
performed, i.e. the gas used for the test as well as the final pressure measured during the test.
Qref: is the calculated leakage measured in dm
3
/h according to the reference conditions described in the
standard, it is related to the gas to be used in the piping as well as to the reference pressure.
Result: is the result of the tightness test.
Compliant (piping suitable for operation): when the leakage flow calculated in the reference conditions
is not greater than 1 dm
3
/h for methane and not greater than 0,4 dm
3
/h for LPG the system is authorized
to o
perate without restrictions or intervention.
Compl. 30 DD (piping temporarily suitable for operation): when the leakage flow calculated in the
reference conditions is included in the range 1 dm
3
/h < Qref ≤ 5 dm
3
/h for methane and in the range 0,4
dm
3
/h < Qref ≤ 2 dm
3
/h for LPG. The system is authorized to operate only for the time needed for the
maintenance of the pipe in order to fix the leakage problem, and in any case for no more than 30 days
after the testing day. Once the fixing has been completed the piping must tested again for its tightness
according to the UNI 7129 standard.
Non compliant (not suitable for operation): when the leakage flow is greater than 5 dm
3
/h for methane
and greater than 2 dm
3
/h for LPG. In this situation the measured leakage is such that the piping is not
suitable for operation and must immediately placed out of order. Once the leakage problem has been
fixed the piping must tested again for its tightness according to the UNI 7129 standard.
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