IGE/SR/23 Venting of Natural Gas
These recommendations cover the safe venting of Natural Gas for
vertical vent systems in permanent, temporary or emergency
These recommendations cover the conceptual design, operation and
safety aspects of venting of natural gas for the depressurisation
of plant or equipment for onshore vertical vent systems. They are
not intended to cover the detailed design, manufacture,
installation, maintenance and inspection of the hardware, or to
cover flare systems, though they do provide guidance in the event
of vented gas being ignited. They only cover releases of liquid
free Natural Gas which have a combined proportion of methane plus
inerts of greater than 89% by volume and temperature between
-50oC and 50oC from vent stacks with internal
diameters equal or greater than 25mm of flow rates up to 40kg
s-1. They do not apply to instrumentation vents and
purging and venting operations where small volumes of gas are
released. Specifically, it covers:
- Relevant legislation.
- Vent design, including stack exit velocity, flow control, gas
dispersion, thermal radiation and ignition sources.
- Design of permanent vent systems, including pipework and vent
- Additional concerns for consideration with temporary vent
- Major planned venting operations.