Alderley

Technical excellence: delivered

Application NotesCrude Oil Metering

Project Name:Thistle Oil Export Skid Replacement

Location:Thistle Platform, 125 miles north east of Sumburgh, Shetland Islands

EPC Contractor/Consultants:Wood Group PSN

End User:EnQuest

Scope of ApplicationThe new crude oil metering package will be installed on the EnQuest operated Thistle Alpha platform in the North Sea, and is part of a redevelopment programme replacing the existing skid supplied by Alderley in 2007.

The package consists of two streams in parallel, each capable of measuring 100% of the maximum flow. A third master stream will be provided for online meter verification. Each stream will utilise the existing coriolis flow meters.

The package is provided with the necessary temperature and pressure measurement. Wiring will be taken to the skid edge junction boxes for connection, by others, to the existing control panel.

Thistle Alpha

Alderley

www.alderley.com

Rev. 05.01.17

Applicable Standards

EnQuest Specification – TH11177-07-IN-SP-001 + Appendices

Design Code: B31.3

API MPMS Chp. 5.6: Liquid Metering Measurement of Liquid Hydrocarbons by Coriolis Meters

DECC Guidance Notes for Petroleum Measurement, Issue 8

• 2 x 6” NB ANSI 600# inlet/outlet headers

• 2 x 100% 4” ANSI 600# meter runs

• 1 x 4” NB ANSI 600# master inlet header

• 1 x 100% 4” ANSI 600# master meter run

• 3 x 4” Twinseal manually actuated valves, c/w DPG

• 4 x 4” Twinseal motor-actuated valves, c/w DPT

• 2 x BS+Ws

• 3 x ¾” 600# thermal relief valves

• Small bore valves for drain and vent connections

• 1 x test bench

• 1 x sight glass

• 3 x 1500# pressure transmitters – HART Protocol

• 3 x 1500# temperature RTDs and thermowells

Main Equipment