Note:
Refer to Purge data on page 20 for the purge gas supply requirements.
6
.7.1. Flammable/pyrophoric materials
WARNING:
Obey the instructions and take note of any precautions given below to ensure
that pumped gases do not enter their flammable ranges.
When flammable or pyrophoric materials are present within the pump there may
be additional risks that you are responsible for assessing and managing as part
of the entire process system installation. The severity of the risks and the
necessary control measures will depend largely on whether the process system
exhaust is in the flammable region, if this is part of normal operation, or if it might
only occur under rare conditions. The additional risks arise because all dry
pumps must be considered as a potential source of ignition due to the heat of
compression, or possibly friction. If ignition occurs then the following may
happen:
▪ High pressures could occur within the pump and may not be contained.
▪ A flame front could travel back up the foreline.
▪ A flame front could travel downstream from the exhaust of the pump.
Industry best practice suggests that the following measures will reduce the risks
of pumping flammable mixtures and pyrophoric materials, but it is your
responsibility to carry out a risk assessment and take appropriate measures:
▪ Do not allow air to enter the equipment.
▪ Ensure that the dry pumping system is leak‑tight.
▪ Ensure that gases in the pump do not enter the flammable range. This may be
achieved by diluting gases in the pump by supplying sufficient inert gas purge.
For example, dilution with nitrogen to below one quarter Lower Explosive
Limit (LEL) or
, if that is not practical, to below 60% Limiting Oxidant
Concentration (LOC).
▪ The gas module supplied with the pump is not intended to perform a safety
function. You may need to consider adding appropriate measures to monitor
the flow of purge gas (for example, external sensors).
For further information refer to publication number P40040100, applications note
'Pumping Flammable Gases' P4100090 or contact us.
6.7.2. Gas purges
WARNING:
If inert gas purges to dilute dangerous gases to a safe level are to be used,
ensure that the pump is shut down if inert gas supply fails.
Switch on the inert gas purge to remove air from the pump and the exhaust
pipeline before the process starts. Switch off the purge flow at the end of the
Installation
07/2021 - ©Atlas CopcoPage 901950840208_A
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