PACKAGE : I Bid Document VOLUME : II - Public Health Engineering

Preparation:
The air valves and the isolating valves shall be examined before laying for cracks
and other flaws. Only undamaged air valve shall be used. The air valves shall be
opened and shaken for the air opening below the vulcanite balls on the bronze seats
of the balls before fixing. All grid and foreign material shall be removed from the
inside before placing. The flanged face shall be thoroughly cleaned and coated with
a thin layer of mineral grease. In case of screw down type, the threads shall not be
in damaged condition.
Jointing Materials:
The contractor shall provide all the necessary jointing materials, such as nuts, bolts,
rubber packing, white zinc jute, lead wool etc. at his cost. All tools and plant
required for installation of air valve shall be provided by the contractor at his cost.
All the jointing materials shall be got approved from Engineer in charge before use.
The nuts and bolts shall conform to IS: 1364 and the rubber packing shall conform
to IS: 638.
Installation:
The air valves shall be fixed on a branched flange Tee on the main pipeline. The air
valve and isolating sluice valve shall be housed in a chamber.
Testing:
The specification pertaining to sluice valve shall also apply to air valves.
13.3 Fixing of C.I. M.H. Frame and cover in RCC Slab.
General:
The specification includes all requirements of fixing C.I. M.H. frame and cover of
specified size and weight in the RCC slab with locking arrangement. For fixing the
C.I. M.H. frame and cover of specified size and weight, the frame shall be fixed
generally at the time of casting RCC slab with proper anchoring.
GTS : General Technical specification. Page 99