Pipe Joints 139
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d:\N-Design\Des8-1.pm5 Seventh Print
Table 8.2 PVC pipe fittings—technical data
Description size in mm Inch Applications
I.D equivalent
- Equal tee 20 to 160 0.5 to 6.0 These are used for bypass and taking
big service line out of main line.
- Reducer tee 20 to 160 0.5 to 6.0 These are used for reduced tapping
from main line
- Male threaded 20 to 140 0.5 to 5.00 These are used to connect the GI pipe
adapter (MTA) line/metal line and all types of valves,
taps, etc., through a male portion of
PVC threaded adaptors.
- Female threaded 20 to 90 0.5 to 3.0 These are used to connect a PVC pipe
adapter (FTA) line directly to a metal pipe.
- Reducing FTA 25 × 20 0.75 × 0.5 These are used to connect a PVC
to to pipeline directly to a metal pipe of
90 × 75 3.0 × 2.50 lower diameter or vice-versa.
- Reducer 25 × 20 0.75 × 0.5 These are used to convert the service
to to line, into a small line.
160 × 140 6.0 × 5.0
8.5.3.3. Applications
The following are the typical applications of PVC pipes:
1. Agricultural and lift irrigation
2. Rural and urban drinking water supply
3. Industrial/chemical effluent disposal
4. Acids and slurries transportation
5. Telecommunication cable ducting
6. Bio-gas (Gober-gas)/Natural gas, and oil distribution lines
7. Tube well casings
8. Under-ground or open pipe line/drainage
9. Domestic plumbing and drainage
10. Sewage and drainage
11. Air conditioning/industrial ducting
12. Main line in sprinkler/drip irrigation
8.5.3.4 Joining
Threaded PVC pipe fittings should not be over-tightened, as the threads may get damaged.
PVC pipes should never be threaded, and they are joined by a solvent cement or by suitable
threaded fittings. The steps followed for joining the PVC pipes are:
1. The pipes are cut as square as possible. The pipe and socket should be clean and dry.
The surface is cleaned with emery paper before joining.
2. Thick coat of solvent cement is applied on the outer surface of the pipe and also on the
inner surface of the socket.
3. The pipe is inserted into the socket and turned through 90° for even distribution of
cement.
