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Nitrogen extraction on Offshore Topside Platform
1. NITROGEN EXTRACTOR
Why do we need to extract nitrogen?
• Nitrogen lowers the BTU value of the gas and makes it unsaleable to
most pipelines.
• Natural gas will be accepted for transport by pipeline only if it contains
less than a specified amount of nitrogen, typically somewhere between
4% and 6%.
2. NITROGEN EXTRACTOR
Gas containing 8% to 15% nitrogen
is compressed & passed across a
first set of membrane modules.
The permeate which contains 4%
nitrogen is sent to pipelines.
The nitrogen rich gas is then
passed to second set of membrane
modules which produce nitrogen
depleted permeate having 10% to
20% nitrogen.
It is further mixed with inlet supply
for recovery & waste having 50%
nitrogen is used as fuel.