Page 36 - Gi flipbook April 2018

IGEM NEWS | Young Persons Paper Competition 2017

Failure of a Mokveld

volumetric flow control valve

Matthew Skeoch, Team Manager, SGN Maintenance
Operations and YPPC 2017 finalist

n May 2016, SGN published its GLENMAVIS NATIONAL can be opened against full differential
annual report which at the time OFFTAKE pressure, providing all the key factors
reported to have an overall Located to the north east of Glasgow, in relation to the operation
regulated asset value of £5 in Scotland, the Glenmavis national requirements of a gas offtake site.
billion. Included in that figure offtake has been online since the late There are two main inlets to the
I was over 74,000km of 1970s and is one of the largest gas Glenmavis national offtake, both of
pipelines, mains and services spread offtake sites in the UK. The site alone which are supplied gas via the national
over two networks, supplying gas to is predominately responsible for the transmission system (NTS). Located
over 5.9 million customers and supply of gas to the west of Scotland on both inlets, the Mokveld FCVs
businesses across the South of and, if required, has the potential to have been specifically designed and
England, Scotland and the Hebrides. feed up to nearly a million customers installed to provide accurate volume
Taking that into account, reflecting and businesses. (See Figure A) control in response to network
on the events surrounding the failure demand. (See Figure B)
of the Mokveld volumetric flow WHAT IS A MOKVELD The valve itself comprises of three
control valve (FCV) within the VOLUMETRIC FLOW CONTROL main components:
Glenmavis national offtake provides a VALVE? • The valve actuator
unique opportunity to highlight and The Mokveld FCV is specifically • A travel indicator
acknowledge the importance designed to be suitable for high • The valve body
maintenance operations serves in pressure volume control or for The valve actuator is used to power
safeguarding our assets, their value quick-acting safety applications on oil and control the open and closed
and the gas network’s security of and gas installations. The valve itself function of the valve to allow accurate
supply. has no impact on operating forces and volume control over network demand.

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