Tender Specification for Supply, Erection, Testing and ... - IDCO

52. Code of practice for installation and maintenance
of motors
IS 3106 : 1966
53. Bourden tube pressure and vacuum gauges IS : 3624
54. Code of practice for selection of standard worm
and helical gear boxes.
55. Mild tubes, tubulars and other wrought steel
fittings.
56. Electrically welded steel pipes for water, gas and
sewage.
57. Gun metal gate, globe and check valves for
general purposes.
IS : 7403
IS : 1239
IS : 3589
IS : 778
NOISE AND VIBRATION CONTROLS:
The air conditioning contractor must take all necessary precautions to have minimum noise
generation and its transmission. Minimum vibration as permitted by IS relevant code shall be
ensured. A few points for guidance only are given below:
a) Double fire retardant flexible connections shall be provided from air discharge to outlet of airhandler
to the duct.
b) Vibration isolation pads of suitable thickness commensurate to loading for isolation of vibration
shall be provided under all pumps, air handlers fans etc. in consultation with manufacturer for
proper selection of vibration isolators.
c) Vibration isolation springs of suitable size to suit the weight of Air Cooled chilling machine if
recommended by the manufacturer for elimination of vibrations shall be provided as suitable for
type and model of Air Cooled chilling unit.
d) The floor supported piping shall be mounted on pipe supports with 7.5mm ribbed neoprene pads
between the base plate of the pipes and the floors.
e) In case of ducts, conduits, pipes and tubes the annular space between construction and
penetrating element shall be sealed suitably.
f) All ducts starting from air handling unit shall be provided with acoustic lining as indicated in the
tender drawings.
g) The air-conditioning contractor shall take all other precautions or shall make his own
arrangements even if not specified in the tender documents for eliminating high noise levels
and shall minimize vibrations in all mechanical equipments without any additional cost.
INDIGENOUS SCROLL AIRCOOLED CHILLERS:
The specification under this section covers the supply, installation, testing and commissioning of the
INDIGENOUS AIRCOOLED CHILLERS conforming to these specifications and in accordance with
the requirements of the schedule of equipment.