1. MATERIAL
AND DESIGN SPECIFICATIONS
a. The pipes used in the
complex should be Mild Steel (ERW-C Class-ISI 1239) Manufactured by Tata /
Jindal / Zenith 15mm (1/2")
dia. pipe Outer dia. 21.8mm - 21.0 mm minimum, Wall thickness 3.25 mm, Weight
of pipe -1.45 kg/m 25 mm (1")
dia. Pipe outer dia. 34.2 mm to 33.3 mm minimum, Wall thickness 4.05 mm weight
of pipe - 2.97 kg/m
b. Copper pipes inside
kitchen should be manufactured by Hindustan Copper / Nissan Copper. (IS 2501)
c. All Gas Meters, Gas
Regulators, Auto Change Over, First Stage Regulators, Second stage regulators
& Ball Valves should be of Comap, (Italy / France Make)
d. Pigtails (Suraksha
Make), Non Return Valve (Gesso Make), Pressure Gauge (Hitec / Dynamic)
e. System designed should
have uniform pressure in the hot plate in all the flats at all the times, even
when all are on at the same time.
Please ensure weight of pipe for 1m length of pipe.
2. CIVIL
WORKS
a. Excavation of trenches Minimum 3ft depth. There should be minimum 1ft
difference between the under ground gas pipe and any other service lines ie:
(drainage lines, water supply lines, electric cable etc) to avoid any damages
to the pipe line, also to avoid crossing. In short under ground gas pipe line
should be at the lower most level with respect to service lines.
b. Compact the excavated trench bed using a Dumas before laying PCC
c. Lay PCC (1:3:6) at the base of the under ground pipe min 5cms as support base
for pipes throughout the length of the trench.
d. CONTRACTOR TO COMPLETE ITEM C 1 TO C5.
e. After contractor finishes the above items, multiplast strip of 2mm thickness
and as per required width should be fused on entire circumference of the pipes.
Put GI wire at every 50cms so that multiplast does not rotate around the pipe.
f.
CONTRACTOR TO COMPLETE ITEM C 7
g. After contractor finishes the above items encase the pipe with PCC (1:3:6) from
all sides minimum 8cms thickness using simple form work to create a box like
protection PCC layer.
h. Cover soft mud minimum 20cms above the pipe and lay indication/ guidance tiles
made of Shahabad / kadappa / broken tiles etc.) and later cover the remaining
trench with excavated mud with proper compaction
i. Drilling of hole in the granite platform in kitchen.
j. Core cutting wherever required.
3. WORKS
by the CONTRACTOR
a. Vertical pipes should be in plumb, properly clamped to wall & painted with
one coat anti corrosive paint and two coats of enamel paint (Yellow
colour)
b. After welding /joining of under ground pipes is completed apply one coat of
zinc chromate primer.
c. Test all under ground and vertical lines with Nitrogen gas at 6 kg/cm2 pressure
by closing open ends of by means of valves or dead flanges.
d. Observe for any leakage at welded joints of pipe, and fittings by bubble test
method ie: Make powder soap water (recommended for powder soap used for
automatic washing machines). Apply it over the welded pipe joints and fitting
joints with help of Brush or cloth soaked in soap water. If there is leakage
you will observe bubbles of soap water at the welded area.
e. After the leakage test is completed as per satisfaction of Acron Engineer's in
charge apply two coats of HB black/ coal tar.
g. After the multiplast strip fusing is completed wrap the pipe with polythene
sheet strips over multiplast. Thickness of polythene sheet should minimum 100
micron or same thickness of polythene as used below PCC for ground floor
apartments.
