❓ Question regarding the disconnection of a 'dead leg' pipe and water quality testing at the Perth Children's Hospital. The response details the extent of disconnection, materials used, and flushing valve operation and water quality results.
AnsweredQoN 1976Legislative Assembly
QuestionView source ↗
I refer to Question on Notice No. 40 to the Treasurer in which he advised that the 54m 'dead leg' was located only 9m from the southern feed inlet to the Perth Children's Hospital basement and ask: (a) what length of the 54m dead leg was disconnected from the ring main; (b) of the remaining length of the dead leg still connected to the ring main, is this composed of the original 300mm epoxy coated ductile iron or a new replacement pipe; (c) if the pipe was replaced as in (b), what is the material composition of the new pipe; (d) was any of the existing ring main replaced at or about the time the dead leg was disconnected, and if so, at what locations; (e) if any sections of the ring main have been replaced, what levels of corrosion were observed on the inside of the pipes, and if so, has any testing been undertaken and what were the results; (f) at what exact location was the scour value installed in the ring main; and (g) since being installed how many times has the scour valve been operated, and at each time was water quality tested, and if so, what were the results?
AnswerView source ↗
Answered
10 October 2017
Responded by
Minister for Health
Response time
9 days
I am advised that:
(a) Approximately 54 metres of dead leg was disconnected from the ring main.
(b) Approximately 50mm of the original concrete lined steel pipe dead leg remains in place connected to an eccentric reducer (300mm – 100mm), and 100mm isolation valve stepping down to a 40mm copper flushing leg with a lockable valve.
(c) Not applicable, the pipe was not replaced.
(d) No, none of the ring main was replaced.
(e) Not applicable.
(f) On the advice of States Advisers, no scour valve was installed. A 40mm lockable ball valve for flushing and sampling is attached to the existing ring main where the dead leg was terminated.
(g) The 40mm flushing valve is operated daily. Tested water quality from the flushing valve is consistently below 0.01mg/L.
(a) Approximately 54 metres of dead leg was disconnected from the ring main.
(b) Approximately 50mm of the original concrete lined steel pipe dead leg remains in place connected to an eccentric reducer (300mm – 100mm), and 100mm isolation valve stepping down to a 40mm copper flushing leg with a lockable valve.
(c) Not applicable, the pipe was not replaced.
(d) No, none of the ring main was replaced.
(e) Not applicable.
(f) On the advice of States Advisers, no scour valve was installed. A 40mm lockable ball valve for flushing and sampling is attached to the existing ring main where the dead leg was terminated.
(g) The 40mm flushing valve is operated daily. Tested water quality from the flushing valve is consistently below 0.01mg/L.
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