Support on Pressure drop & line size calculation for DP tagged items of Utility Lines (LSTK#3 Ethylene Glycol job, IOCL – Paradip Refinery)

IOCL is planning to install an Ethylene Glycol production facility comprising of an ERU (Ethylene Recovery Unit) of capacity 180KTA, Glycol unit of capacity 357 KTA (comprising of MEG–332 KTA, DEG-24 KTA and TEG-1 KTA), at the Paradip Refinery Complex. The MEG product will be dispatched via Tank Trucks and ships from the Paradip Refinery to the South Oil Jetty through a dedicated 20” pipeline. After transferring one batch to a ship, some MEG product may remain in the pipeline. It is proposed to recover/remove this MEG in the pipeline immediately after a shipment or at the earliest by installing a pigging system for the 20” pipeline.

The pig will be launched via a Pig Launcher installed at the South Oil Jetty (SOJ). Nitrogen from SOJ will be used to propel the pig to remove the residual MEG from the pipeline. A Pig Receiver at the Refinery will trap the pig and transfer the pigged and recovered MEG to the MEG storage tank from where it has been pumped or to any one of the MEG storage tanks based on operational availability. Additionally, a metering skid shall be provided on the line to the Loading Arm.

The scope of the project consists of performing pressure drop calculations for the Utility lines in


The Pressure drop study were performed for 8 utility lines with Nitrogen, Instrument Air & Water Service. The calculations were verified for Maximum Tie-in pressure, Normal Tie-in pressure and Minimum Tie-in pressure scenario. Each line pressure drop was calculated for Maximum, Normal and Minimum flow rate case. The results of the Pressure drop calculation highlighted the adequacy of existing Line size.