2.
Valves are used in piping systems to stop and start the flow of fluids, to regulate flow, to
prevent back flow, and to relieve excessive pressure build-up in the piping. Considerati
on
shoul
d be given to the appropriate location and orientation of valves necessary for saf
e
oper
ation and isolation of the piping.
3.
All piping and piping components used should be suitable for the design
temperatures, pressure and fluid used in the system.
4.
During the installation, ensure that no dirt, water, or residue from welding is left in the system.
5.
Expansion joints or properly designed and sited loops should be provided to accommodate
thermal expansion. Thermal expansion should be calculated using the maximum possible
ut
ilisation fluid temperature, regardless of whether the pipe considered is in the feed or return
circuit. Steel pipe will expand approximately 1 mm per meter over 100 °C rise.
6.
Supports and anchors must be provided for all pipes, as necessary, to prevent undue stresses
from being placed on equipment, including pumps, valves, and the boiler. Supports and
anchor
s which will not interfere with thermal expansion should be chosen. The equipmen
t
shoul
d never be used or considered as an anchor.
No additional loads should be applied to any factory connection.
7.
Gaskets must be used to make all flanged connections. Gasketing material must be suitable
for use with the pressure, temperatures and fluids in the system. Ensure that all bolts ar
e
tig
htened evenly and to the torque recommended values provided by the gasket
manufacturer.
8.
High point bleeds/air vents are to be installed at all high points in the steam system piping.
9.
All pipes should be installed with a fail of at least 1 in 100 to facilitate draining and venting. Suitable
condensat
e drainage traps should be installed.
After the appropriate system tests have been satisfactorily completed, all hot pipework and vessels
(excluding blowdown vessels) must be adequately insulated with material suited to the temperature
and application to prevent both heat loss and personnel injury where practicable.
Note: It is recommended that for inspection and maintenance, pumps, flanges, valves and fittings should be lagged with
removable insulation covers.”
Adhere to the following:
1.
Return tanks, surge tanks and deaerators should be insulated. Insulation should be chosen
with care such that the fluid in the tanks does not exceed the maximum operating temperatur
e
of
the pump (90° C).
2.
Blowdown vessels should not be insulated.
3.
Equipment should be insulated with material suitable for the application and temperatures
expected.
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