Version
Document Title
Release Date
02
Narrow Body EL2.1 (REV. A)
–
Owner's Manual
2021-03-22
EL 2.1 -
Owner’s
Manual - Rev.02
–
Mar 2021
30
Safety areas around the purge and vent outlet
Attention!
The following section is only to be used as a guide for basic system sizing and
installation. It is the installer's/owner's responsibility to ensure the vent and
purge line outputs are safe and to apply their own safety concept to their
installation.
Carefully ensure that all outputs from any system are managed appropriately
and satisfy local codes and regulations.
Generally, there are two options:
The extents of this
safety area
depend on different parameters, for example, the diameter and the
length of piping leading to the safe area, the vent spout design, exit velocity and wind conditions.
1.
Preferably, customer/system integrator/operator calculates the measurements of the safety area
based on the provided data for each specific output and applies industrial standards such as the
following to their system design, safety concept and site documentation.
a.
NASA: Safety Standard for Hydrogen and Hydrogen Systems
b.
EIGA Doc 211/17: Hydrogen Vent Systems for Customer Applications
c.
EIGA Doc 75/07/E: Determination of Safety Distances
d.
CGA G5.5: Hydrogen Vent Systems
e.
API 521: Pressure-relieving and Depressuring Systems
2.
Or follow the recommendations of Enapter for systems up to ten EL2.1s and 2 DR2.1s. The safety
area is cylindrical and has a height of 10 meters and a radius of 5 meters. Note that depending
on the design of the purge piping and exit velocity, this area also extends in the direction of the
ground by at least 1 meter.
Never place the vent outlet near the purge outlet to minimise the risk of explosion. Leave at least
3 meters space between the gas outlets.
