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

19.23 Valves & Specials for Pump individual delivery & common
header/manifold piping.
The delivery side of each vertical pump shall be of suitable dia., subject to min
200mm. and to be provided with CSDF, extended spindle manual gear box type
butterfly valve with motorized actuator and position indicator, one CSDF,
Non-return valve, one DF rubber expansion joint, MSDF short piece (of suitable
length) etc. The common delivery manifold & header pipe extending upto the
outside wall of the pump house, shall be of MSDF pipe with 500mm dia. for
carrying highest discharge of 2 pumps and there shall be 1 no. extended spindle
manual gear box type butterfly valve of requisite dia. (minimum 350 mm.) at the
end of the manifold. The connection between the individual pump delivery branch
& common manifold shall be through MSDF radial Tee connection. All the state
pipes of the individual pump delivery and manifold/header piping shall be
DF rubber expansion joint suitable for individual pump discharge and MSDF
Puddle Pipe for common header etc. shall also be provided as require. Respective
thickness of the Flange and wall shall be as per relevant IS Codes. All brick
masonry and RCC work for supporting the pipe lines as well as providing steel
fabricated/ RCC thrust blocks at all the ends of the pipe lines shall be within the
scope of this job and the same shall be included in the laying cost. All required nuts,
bolts, washers, foundation bolts, rubber insertions, hardwares etc. shall be inclusive
in the offered rates.
The individual pump delivery branch shall be provided with a 100 mm. dial
pressure gauge (0-20 kg/cm 2 ), 3 way cock and fittings, one 150 mm. dial pressure
gauge (0-20 kg/cm 2 ) with 3 way cock and fitting shall be placed on the common
header.
19.24 Butterfly valve for individual pump discharge branch and common
header.
The Butterfly valves shall be CSDF ling wafer type, P.N., conforming to
IS:13095. The seat pressure shall be 20kg/cm 2 and the body pressure shall be
25kg/cm 2 . The valve shall operate smoothly and steadily in both directions, free
from flow induced vibrations. It shall provide tight shut off closure and shall be
suitable for frequent operations as well as for throttled duty condition. The valve
disc should rotate 90 from full open to full close position. The valve disc shall be
solid stream lined slab design and to have minimum head loss. The seal ring shall
be replaceable type and to be bolted on the body. The rubber seal on the disc must
be of easy replaceable type with the facility of replacement at site. The valve of
both individual pump branch and common header shall be CIDF and of suitable dia.
subject to minimum 250mm. and 500mm. respectively for individual pump branch
and common header. Operational arrangement of the Butterfly valves shall be with
motorized actuator with inbuilt gear box and providing with extended spindle with
suitable yoke so as to operate the same by the operator standing at ground / floor
level.
DTS : Detailed Tender Specification. Page 205