Page 34 - Gi_April2022

igem news – yppc

STORNOWAY ODORANT

CHANGEOVER PROJECT

By Luke Macdonald, Engineering Manager (SIU) the 270-mile trip from supply to offload,
at SGN and YPPC 2021 second runner-up including a ferry crossing. In addition,
the existing odoriser was unreliable and
STORNOWAY IS A small town located has been odorised on site using had no equivalent replacement. The
on the Isle of Lewis in the Western Isles tetrahydrothiophene (THT). Due need for a new odoriser would result
of Scotland and is home to one of five of to several safety and cost factors, in a major design change and, with no
Scotland’s Independent Undertakings a change was proposed to switch current backup, left SGN’s gas supply
(SIU), owned and operated by SGN. from odorising on site to taking pre- operations vulnerable.
The site at Stornoway is unique in odorised loads from our supply point. The Stornoway LPG storage site
that it stores upwards of 500 tonnes The odorant injected and commonly has been in operation for 50 years
liquified petroleum gas (LPG), which is used across the LPG industry in gas and during this time the network
subsequently vaporised and distributed bottles and mini bulk tanks is ethyl and associated customers have been
into the local network, serving its mercaptan (EM), differing significantly supplied with gas odorised with THT.
1,800-strong customer base with gas. from the existing odorant, THT. The odoriser injection equipment on
Since the initial build of the A changeover would provide the site was showing signs of ageing and a
site in the early 1970s, the LPG ability to conduct leak detection during lack of spare parts and indeed a suitable

34

17/03/2022 11:09
IGEMNews_YPPC.indd 1 17/03/2022 11:09
IGEMNews_YPPC.indd 1