The explosion at the Abbeystead valve house in May 1984, with its attendant loss of life and injury, forcibly drew the attention of the public to the dangers of methane and other natural gases. It also reaffirmed to the water industry and engineering professions the pervasive nature of the gas and the need to take appropriate measures in the construction, design and operation of any scheme which involves a possible methane presence. The investigations into the source and mechanism of the methane gas ingress, and the design of the permanent repairs and modifications to the scheme, have illustrated many of the risks and problems associated with methane and the measures for dealing with them.
The paper describes the essential repairs and modifications which had to be carried out, the main lessons learned, and the recommendations which are felt to be applicable to new and existing water schemes where methane may be present.
This is a historicaldocumentthat is being releasedforpublicavailability.This wasmadefrom thebestavailablecopy. Neitherthe United StatesGovernment nor any agency thereof, nor Battelle Memorial Institute, nor any of their employees,makes any warranty, expressor implied, or assumes any legal liabilityor responsibility for theaccuracy,completeness, or usefulness of any information, apparatus, product,orprocess disclosed, or represents thatitsuse would not infringeprivatelyowned rights.The viewsandopinionsof authors expressed herein do not necessarily stateor reflectthoseof the United States Governmentor any agencythereof.Page Dl: presents a process channel and process tube breakdown by metal load type; also gives the total flow for each load type.Page El: gives the total number of tube channels for various tube classes.Page Fl: this page gives a breakdown of the tube flow and Panellit pressure for each load type and flow zone. Especially useful is the average flow and Panellit pressure presented here. This can be used as a comparison point when trying to spot flow or pressure abnormalities. Also given is the total number of tubes for each load type and flow zone.
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