CoatingsPro Magazine

MAY 2018

CoatingsPro offers an in-depth look at coatings based on case studies, successful business operation, new products, industry news, and the safe and profitable use of coatings and equipment.

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70 MAY 2018 COATINGSPROMAG.COM Never Again The fractured lining on a separator showed heav y delaminated on the bottom section. By John Petersen, Owner of Petersen Consulting The Case of the Lining Failure on Board an FPSO Vessel T he lining in a separator on board a Floating Production Storage & Offloading (FPSO) vessel failed. It was discovered during a routine integrity inspection where the pressure vessel was taken out of production, cleaned, made gas free, and opened for a visual inspection. An FPSO is essentially an oil tanker with a mini processing plant on its topside. Its function is to be stationed offshore — usually in deep water — and stay connected to one or more subsea wells. e fluids from these wells are brought on board via risers (aka flexible hosing) to be separated into oil, gas, and water. e oil is stored in the vessel 's cargo tanks, the gas is used for power as well as being pressur- ized and injected back into the field, and the water is reinjected back into the field to keep the pressure up. Once the cargo tanks are full, another tanker comes alongside to receive the crude oil from the FPSO. e steel separator is where the failed lining was observed. Due to the often-aggressive fluids that come out of the ground, the separators are usually lined with a suitable coating system to withstand both aggressive fluids as well as abrasive particles, such as sand, that may be present in these fluids. In this case, the separator was lined with a phenolic epoxy coating. is phenolic epoxy was chosen as it was advertised to be able to withstand thermal cycling up to 120 °C (248.0 °F). e lining was Photos courtesy of Petersen Consulting Due to the often-aggressive fluids that come out of the ground, the separators are usually lined with a suitable coating system to withstand both aggressive fluids as well as abrasive particles, such as sand, that may be present in these fluids.

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