LNG

LNG liquefaction plants are designed to handle a range of feed-gas compositions based upon the anticipated field production profiles.

However, during detailed engineering, or in operation, the plant may be required to handle feed-gas compositions which fall outside its design operating envelope.

Feed to LNG plants is composed primarily of methane, together with ethane, propane, butane and heavier components.

Table 1: Typical LNG feed-gas composition for liquefaction plants

Non-hydrocarbon components such as nitrogen, carbon dioxide, hydrogen sulphide and mercury are also usually present. A typical range of feed composition is shown in Table 1. During the early design stages of a project, the range of feed-gas composition is established based on the field data available at that time. 

Engineering judgement is used to review the compositions and production scenarios to fix the design envelope for the plant.

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