OFFAHORE METHANOL INJECTION PACKAGE PIPING SYSTEM

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ASCENT

Karnataka, India

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We have designed the piping system connecting offshore methanol injection package and methanol injection drum to ensure compliance to ASME B31.3 allowable limits. The methanol injection system was designed to run at a pressure of 690 bar and a temperature of 80 °C. The specified pipework was constructed of A790-UNS S31803-1 rated to API-6A 10K RTJ. We determined the pipe stresses for various load cases and documented the forces and moments at the vessel/shell and tube heat exchanger nozzle connections, at pipe anchor points, and at supports.

We considered a vertical expansion loop to overcome overstresses in strategic locations where it was not possible to reroute the pipes. We calculated PSV (liquid) thrust forces, which were considered in the analysis to build an accurate and reliable model. We assessed predetermined trunnions and dummy legs utilizing the Kellogg method to ensure the local stresses are not exceeded to a damaging effect. Each flange within the system’s boundary limits was assessed for flange leakage calculation (ASME III Div. 1 NC 3658) to ensure leak-free flange joints against all predefined load cases.