Pipe Joints 137
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d:\N-Design\Des8-1.pm5 Seventh Print
(^196)
f
25
f
25
f
18
f
32
22
40
d-Male thread
adapter 25 × 25
f
32
f
25
19
19
50
f 25
f 32
e-Elbow 25 × 25
18 18
(^3218)
f 25
f 32
f
32
f
25
f
25
64
32
f-Tee 25
18 18
15
f 20
f 32
f
32
f
25
f
25
64
32
g-Tee female thread
adapter 25 × 25 × 20
16
Fig. 8.14 PVC pipe fittings
8.5.3.1 Salient Features
PVC pipes exhibit the following salient features:
1. Smoother bore in comparison to CI, GI and also cement pipes, thereby better flow
characteristics.
2. Seemless, strong and resilient.
3. Light weight, offering total economy in handling, transportation and installation.
4. Resistance to chemical, electrolytic and galvanic corrosion.
5. Odourless and hygienic for transporting potable water, as they do not subject to
contamination.
6. Maintenance free.
7. Long-lasting-PVC is free from weakening by scale formation, rusting, weathering
and chemical action and hence more durable for rated working conditions.
8.5.3.2 Properties
The following properties are expected from pipes made as per BIS specifications:
1. Thermal conductivity – 4 × 10–4 cal/hr – cm/°C/cm^2
2. Co-efficient of linear expansion – 5.0 to 6.0 × 10–5 mm/°C
3. Specific gravity – 1.41 gms/cm^3
4. Combined flexural and compressive strength – 600 kg/cm^2
5. Impact strength at 20°C–3 kg/cm^2
