207.
Q. 57
LOAN WORKS.
SHING MUN VALLEY SCHEME 2ND SECTION.
Second Cross Harbour Pipe:-This work was referred to in paragraph 232 of last year's Report.
Construction:-Delivery in the Colony of the flexible Ball and Socket joints commenced on January 5th. The laying of the submarine pipe was commenced on January 14th and was completed on March 22nd, a period of fifty-six working days. The connections between the submarine and land sections of the pipe line, including the necessary alterations to, and connections with, the existing supply mains in Kowloon and Hong Kong, were completed on April 9th. The pipe line was put under test from this date till April 30th. The results of the tests were very satisfactory, an average daily leakage of only forty-three gallons being recorded. Protective works which included the setting of heavy concrete anchor blocks and general levelling up of the harbour bed with rubble were completed by the end of May. The pipe line was first brought into use on June 18th when water for Hong Kong was first available this year from the mainland resources.
Description:-The pipe line is on the East side of the existing 12" pipe at about 7'-6" centres. It is composed of butt welded steel pipes 18" internal diameter and 7/16" thick in lengths of 20'-2" and 21'-0" the pipes having tapered sockets and parallel spigots 10" in length for long sleeve welded joints. The pipes are protected inside with a centrifugally deposited lining of cement concrete 1/4" thick and outside with a composite wrapping of bitumastic solution, double hessian cloth, brass tape and sand.
The wrapping was applied in the following manner: The short lengths of pipe were partly immersed, and then rotated, in a bath of bitumastic solution at a temperature of 400°F. A layer of hessian cloth 10" wide was then wound spirally on the pipe, the edges overlapping 1". Brass tape 4" wide and having 1" overlap was then wound on spirally in the opposite direction. This was followed by another layer of hessian applied in a manner and direction similar to the first layer. The pipe was then removed from the bath and rolled backwards and forwards on a bed of sand until cool. The concrete lining was applied afterwards.
Lengths of approximately 100 feet were fabricated at an assembly yard on shore and consisted generally of three long sleeve spigot and socket welded pipes with a special loose flange and spigot pipe at one end and a special loose flange and socket pipe at the other end.
207.
Q. 57
LOAN WORKS.
SHING MUN VALLEY SCHEME 2ND SECTION.
Second Cross Harbour Pipe:-This work was referred to in paragraph 232 of last year's Report.
Construction:-Delivery in the Colony of the flexible Ball and Socket joints commenced on January 5th. The laying of the submarine pipe was commenced on January 14th and was com- pleted on March 22nd, a period of fifty-six working days. The connections between the submarine and land sections of the pipe line, including the necessary alterations to, and connections with, the existing supply mains in Kowloon and Hong Kong, were com- pleted on April 9th. The pipe line was put under test from this date till April 30th. The results of the tests were very satis- factory, an average daily leakage of only forty-three gallons being recorded. Protective works which included the setting of heavy concrete anchor blocks and general levelling up of the harbour bed with rubble were completed by the end of May. The pipe line was first brought into use on June 18th when water for Hong Kong was first available this year from the mainland
resources.
Description:The pipe line is on the East side of the exist- ing 12" pipe at about 7′-6′′ centres. It is composed of butt welded steel pipes 18" internal diameter and 7/16" thick in lengths of 20-2′′ and 21′-0′′ the pipes having tapered sockets and parallel spigots 10" in length for long sleeve welded joints. The pipes are protected inside with a centrifugally deposited lining of cement concrete " thick and outside with a composite wrapping of bitumastic solution, double hessian cloth, brass tape and sand.
The wrapping was applied in the following manner: The short lengths of pipe were partly immersed, and then rotated, in a bath of bitumastic solution at a temperature of 400° F. A layer of hessian cloth 10" wide was then wound spirally on the pipe, the edges overlapping ". Brass tape 4" wide and having 1" overlap was then wound on spirally in the opposite direction. This was followed by another layer of hessian applied in a manner and direction similar to the first layer. The pipe was then, removed from the bath and rolled backwards and forwards on a bed of sand until cool. The concrete lining was applied afterwards.
Lengths of approximately 100 feet were fabricated at an assembly yard on shore and consisted generally of three long sleeve spigot and socket welded pipes with a special loose flange and spigot pipe at one end and a special loose flange and socket
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