Application
Oil and gas transmission lines

Customer
Oil and Gas Industry

Product or Service Supplied
Computational modelling with ELASTEQ software

Problem
Many oil and gas transmission lines have been lined with polymers to improve lifetime. At high operating pressure, however, the gases diffuse through the liners at different rates and accumulate at the interface of the liner and the metal pipe. Gases, comprising hydrocarbons, H₂S etc are vented to atmosphere in a controlled manner to avoid excessive corrosion.

Objectives
To achieve optimised venting of the lines.

Approach
ELASTEQ software was used to model the permeation rates of the different combinations of gases through the liners.

Outcome/Benefits
A 'minimum venting' scenario which prevents the accumulation of corrosive H₂S at the metal surface whilst minimising the venting of hydrocarbons to atmosphere.

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Venting Frequency Before Venting

Frequency After