Page 2-1
Rev. 0
2. Mechanical Measurement
A system of piping is installed at several sta-
tions in the dam in the first lift just above the
contact between the foundation rock and the
base of the dam. The pipes extend into one
or more of the lower galleries in the dam. Al-
ternatively, holes may be drilled from the gal-
lery down to the level upto which the drain
pipes have to be installed. Drain pipes extend
below the dam, both on the upstream and
downstream side.
The mechanical assembly to be installed at
the top of these drain pipes is detailed in fig-
ure 2.1 and the following table:
Sl. Description
Qty.
1
Reducer (2”x1”)
1
2
1” GI pipe (350 mm)
1
3
Reducer (1”x ½”)
1
4
½” tee
1
5
½” Male nipple (50 mm)
2
6
½” Male nipple (150 mm)
1
7
½” Wheel valve-10 kg/cm
2
(Zalota/Hawa)
1
8
½” GI Socket
1
9
Brass hex. gage adopter
1
10 Teflon washer
1
11 Dial pressure gage
1
The installation is very simple and does not
need a detailed description.
2.1.
T o o ls & accesso ries
The following tools and accessories are re-
quired for proper installation of the uplift
pressure measurement system:
2.1.1
Spanner 23/25 and 30/32 (Taparia)
2.1.2
Pipe wrench (30 cm)
2.1.3
Teflon tape (10 mm)
2.1.4
Thread sealant (Loctite 577)
2.1.5
Acetone (commercial)
2.1.6
Hacksaw with 300 mm blade
2.1.7
Pliers 160 mm (Taparia)
2.1.8
Waste paper basket
2.1.9
Cloth for cleaning (lintless)
Figure 2.1
