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C12.6.5
C12.6.6
Expansion Tank
(a)
An expansion tank of suitably capacity for each water
circulating system with ballcock, valve, overflow, drain and all
necessary accessories shall be provided to meet the local
regulations and the operational requirement.
(b)
The tank shall be fabricated from mild steel plates of 3mm
thickness welded onto a mild steel frame. To stiffen the tank,
mild steel flat bars are to be intermittently welded on the inside
of the tank.
(c)
All steel work, mild steel angle stand including the surfaces of
the tank shall be painted with one coat of best quality primer
and two coats of best quality paint. Colour of the tank shall be
directed by the Architect or his Representative.
Pipework and Valve
All pipework shall be R250 copper pipe to BS EN 1057:1996.
Jointing method for pipe size 65 mm and above shall be of the
flanged brazing or bronze welded type.
All pipes shall be properly pitched and supported with strong hangers,
brackets and saddles. The support system shall be designed to take
into account the size of the pipelines, their content and materials of
construction, the vibration isolation components, the amount and
direction of movement, the location of the pipeline in relation to the
building fabric and other services and the need for access. Adequate
provision shall be provided for free expansion and contraction of the
pipeline.
Gate valves shall be flanged cast iron body with bronze trim, cast iron
wedge, bronze rising stem. Globe valves shall be flanged cast iron
body, renewable bronze disc and seat, outside screw and bronze rising
stem.
Disconnecting flanges shall be installed at valves and at suitable
locations for cleaning and removal of piping. Where pipes pass
through walls or slabs, pipe sleeves shall be provided.
Pipes and valves shall be painted in colours with directional arrow
indication.
C12.6.7
Hydraulic Test
(a)
Water system and circuits shall be hydraulically tested.
(b)
Test pressure for water circuits and components shall be 2
times working pressure, or 1.5 working pressure plus 3.5 bar
whichever is lower.
Section C12
Page 15 of 31
EE_GS
2012 Edition