eprintid: 240
rev_number: 20
eprint_status: archive
userid: 7
dir: disk0/00/00/02/40
datestamp: 2009-10-19 09:44:31
lastmod: 2015-05-29 19:51:00
status_changed: 2009-10-19 09:44:31
type: report
metadata_visibility: show
item_issues_count: 0
creators_name: Hewitt, Ian
creators_name: Taroni, Michele
creators_name: Slim, Anja
creators_name: Byatt-Smith, John
creators_name: Ockendon, John
creators_name: Howell, Peter
creators_name: Bauer, Robert
creators_name: Somani, Sapna
creators_name: Blyth, Mark
creators_name: Parau, Emilian
creators_name: Purvis, Richard
creators_name: Parker, David
creators_name: Hjorth, Poul
creators_name: Duursma, Gail
corp_creators: Bridget Hartley
title: Freeze protection in gasholders
ispublished: pub
subjects: utilities
subjects: other
studygroups: esgi64
companyname: National Grid
full_text_status: public
abstract: In cold weather, the water seals of gasholders need protection from freezing to avoid compromising the seal. These holders have a large reservoir of "tank water" at the base which is below ground. At present freeze-protection is achieved by external heating of the seal water which is in a slotted channel called a cup. Electrical heating or circulation of heated tank water to the cup are examples of systems presently used.

The tank water has a large thermal capacity and National Grid wishes to investigate whether circulation of the tank water without external heating could provide sufficient energy input to avoid freezing. Only tanks in which the tank water is below ground are investigated in the report. The soil temperature under the reservoir at depth of 10m and lower is almost constant.
date: 2008
citation:   Hewitt, Ian and Taroni, Michele and Slim, Anja and Byatt-Smith, John and Ockendon, John and Howell, Peter and Bauer, Robert and Somani, Sapna and Blyth, Mark and Parau, Emilian and Purvis, Richard and Parker, David and Hjorth, Poul and Duursma, Gail  (2008) Freeze protection in gasholders.  [Study Group Report]     
document_url: http://miis.maths.ox.ac.uk/miis/240/1/NationalGrid-FreezeProtectionInGasholders.pdf