INTRODUCTION OF RGTPP
The Plant is Located near Ramgarh Town of
District Jaisalmer in Rajasthan.
The Plant is 60 Km from Jaisalmer.
The installed capacity of the first stage is 110
MW.
The GAIL Pipeline is approximately 35 km from
the Ramgarh Site, from where a tap offline is
also taken.
WATER COOLING TOWER
Cooling tower is a heat rejection device, which
extracts water heat to the atmosphere though
the cooling of a water stream to a lower
temperature.
The generic term "cooling tower" is used to
describe both direct (open circuit) and indirect
(closed circuit) heat rejection equipment.
SPECIFICATION OF LOADING & RCC MATERIAL
The specifications covers general requirements of
materials, design, construction and testing of
RCC works involved in the construction of RCC
induced draft cooling tower.
Loading
Concrete works
Reinforcing steel
Structural steel
Painting for concrete surfaces
Loading
•Wind loads shall be considered as per
IS:.875(part-3)
•Earthquake loads shall be considered as per
IS:1893 duly considering the type of soil and
foundation system
•Dead load shall be considered as per
IS:875(part-2).
Concrete Works
• Cement used shall be OPC complying with IS:8112
• Minimum grade of concrete for various structural
components shall be M 25.
• Minimum cement content per/cum of concrete shall
be as specified in IS:456.
• Minimum cement content shall be used as per
IS:456.
• Material design, construction and workmanship in
general shall conform to IS:456 and IS:3370.
• For pre stressed concrete works, design,
construction and workmanship shall be in
accordance with IS:1343
Reinforcing steel
Reinforcement bars shall be either mild
steel conforming to IS:432 or high yield
strength reinforced bars conforming to
IS:1786
 Steel wires for pressurising shall conform
to IS:1785(part 1&2) minimum diameter of
steel wire of 4mm
Structural steel
 Steel used shall conform to IS:2062
grade A or B as specified.
 The minimum coating of zinc shall be
500gm/m^2 and shall comply with
requirements of IS:2629 and IS:2633.
 Galvanised surfaces shall be further
protected by providing two coats of
bituminous coating conforming to IS:1962
after applying etching primer coat as per
IS:5666.
Painting for concrete surfaces
 Water proof bituminous paint conforming
to IS:9862 shall be provided to concrete
surfaces .
 The preparation of concrete surface for
painting shall conform to IS:2395(part-1).
 Painting shall consist off one coat of
primer conforming to IS:9862 and two
coats of bituminous painting conforming
to IS:3384
CONSTRUCTION OF WATER
COOLING TOWER
1.
2.
3.
4.
5.
6.
7.
8.
EXCAVATION
PLAIN CEMENT CONCRETE
REINFORCEMENT FOR RAFT
RAFT CASTING
COLUMNS
BEAMS & WALLS
SLABS
CURING
1.EXCAVATION
Excavation is done for dimensions of 20 mx12mx2m.
The earthwork so excavated is removed from the site
with the help of JCB & truck.
2.PLAIN CEMENT CONCRETE
PCC is done above the compacted earth surface
using concrete material of grade M5.
The ratio of materials used in PCC is 1:4:8.
The PCC is done before the placement of
reinforcement for raft foundation so as to prevent
the rusting of the reinforcement by oxidation
process which takes place in presence of
moisture of earth surface & the air.
3.REINFORCEMENT FOR RAFT
4.RAFT CASTING
Concrete of grade M10 is used for casting of the
raft foundation.
The ratio of material used in concrete for raft
casting is 1:3:6
STAGES OF RAFT CASTING
I.Batching
II. Mixing
III. Transportation & placing
IV. Compaction
Compaction of concrete in raft foundation is done
by needle vibrator.
It consist of power unit, flexible shaft &
needle.
It is used for removal of air voids in
concrete paste.
Frequency = 12000 cycles of
vibrations/minute
Needle dia. =20mm to 75mm.
Length of flexible shaft= 25 to 90 cm.
5.COLUMNS
Formwork is used for erection of the material
which is used for construction of columns &
beams of the water cooling tower
Formwork vibrator is used for compaction of the
concrete columns
6.BEAMS & WALLS
 Beams are casted at a height of 3m from the
raft casting with the spacing of 30cm along the
width of cooling tower.
 A gap of 1.2m is left vacant above the layer of
the beam and beneath the stone wall for placing
the 3 layer of fill pack material.
Stone wall is constructed above the layer of
beams separating each of the adjacent cell of the
cooling tower(7 in no.).
Above walls separating each shell of cooling
tower a layer of beams is provided with a spacing
of 30cm along the width of cooling tower.
A layer of drift eliminator is placed above this
layer of beam within the spacing's created by the
layer of beams.
Stone walls are constructed immediately above
the second layer of beams .
7.SLABS
One way slab is constructed above the walls of
the shells with openings left for casting of the fan
cylinder.
8.CURING
After concrete is placed, a satisfactory moisture
content and temperature must be maintained, a
process called curing. Adequate curing is vital to
quality concrete.
Curing the concrete aids the chemical reaction
called hydration. Most freshly mixed concrete
contains considerably more water than is
required for complete hydration of the cement;
however, any appreciable loss of water by
evaporation or otherwise will delay or prevent
hydration.
SHELL OF COOLING TOWER
COMPONENTS OF WATER COOLING
TOWER
1.
2.
3.
4.
5.
Cold Water Basin
Fill Media
Plastic Pipes With Nozzles
Drift Eliminators
Erection Of Fans.
1.COLD WATER BASIN
• The basin floor of each compartment shall
be sloped towards a collecting sump for
effectively draining the water to permit
desilting / desludging.
• Water shall be drained from the sump into
a drain chamber outside the basin by CI
drain pipe embedded below the basin
floor.
2.FILL MEDIA
• Plastics are widely used for fill, including
PVC, polypropylene, and other polymers.
• Three layers of fill media is used in each
shell with a total of 1308 pieces, 436 per
layer.
• Plastics are glued together with solgum
cement(16 pcs. Of PVC sheets are glued
to form 1 piece of fill media)
• Fill pack size
300mm x 600mm (42 pcs. In top layer)
1220mm x 300mm(394 pcs. In top layer)
600mm x600mm (middle layer)
1200mm x 600mm (bottom layer)
3.PLASTIC PIPES WITH NOZZLES
•18 pipes are arranged in each shell of cooling
tower with 9 pipes on each side of the channel
carrying the hot water brought from the power
plant through large pipes .
4.DRIFT ELIMINATORS
•These capture water droplets entrapped in the
air stream that otherwise would be lost to the
atmosphere Air after passing through the fill
media is moving upwards with air velocity
sufficiently large to provide an upward thrust for
small water droplets in the cooling tower.
5.ERECTION OF FAN
 Gear box
 Shaft
 Electric motor