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

) Expanded Polystyrene
The density of expanded polystyrene shall not be less than 20 kg per cubic meter and the thermal
conductivity shall not exceed 0.031 Kcal./ hr.m °C at 10 °C mean temperature.
The sample of insulation material shall be submitted for approval to the Engineer in Charge and the
sample shall be tested for thermal conductivity values by the contractor at his own expense. Adhesive
used for setting the insulation shall be non-flammable, vapour proof, CPRX compound.
INSULATION ON SHEET METAL DUCTING
The thickness of insulation used on ducting shall be as detailed below:
Conditioned space
a) Supply Air Duct Insulated with factory Pre-laminated 25mm thick Fibre Glass as shown in the
tender drawing.
b) Return Air Insulated with factory Pre-laminated 25mm thick Fibre Glass as shown in the
tender drawing.
c) Fresh Air Duct Insulated with factory Pre-laminated 25mm thick Fibre Glass as shown in the
tender drawing.
d) Plenums Lined internally with 25mm thick fiberglass rigid board as shown in the
tender drawing.
e) FCU Collars Lined internally with 12 mm thick fiberglass rigid board as shown in the
tender drawing.
The application of insulation should be carried out in workman like manner as detailed below.
INSULATION OF DUCTING WITH ALUMINUM FACED FIBERGLASS:
a) Duct surface to be cleaned thoroughly
b) To apply two coats of CRPX compound.
c) To fix factory pre-laminated aluminum faced fibre glass insulation of density 24 Kg/cmt of specified
thickness.
d) Fix self-adhesive aluminum tape of 50 mm width on all longitudinal / transverse joints.
e) Finally fix PVC straps of 25mm width at every 300mm centre to centre.
ACOUSTIC LINING OF DUCT:
The material to be used for duct lining shall be 12 / 25mm thick resin bonded fibre glass rigid board
having a density of 48 Kg/m³ and covered with 0.5 mm thick perforated aluminum sheet. The lining of
initial length of the duct shall be done as shown in the tender layout drawings & shall be carried out as
follows.
a) Clean the duct piece thoroughly,
b) Fix the board of suitable thickness inside the duct and cover with fibre glass tissue paper.
c) Cover the insulation board with 0.5mm thick perforated aluminum sheet with at least 20%
perforation.
d) Secure the insulation board and aluminum sheet with cadmium coated bolts nuts and cup washers
/ steel screws.
e) Finally seal the ends completely, so that no lining material is exposed.
No of Corrections
-44-
Signature of Tenderer