INSTALLATION - 2
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2-25
VSRT_IOM_2018-1213
Insulation
!
WARNING
After the appropriate system tests have been
satisfactorily completed, all hot pipework and vessels
must be adequately insulated with material suited to
the temperature and application to prevent both heat
loss and personnel injury.
Note:
It is recommended that for inspection and
maintenance, pumps, flanges, valves and fittings are left
uninsulated but suitably shielded for safety.
Adhere to the following:
1. The boiler is insulated at the factory. No
additional insulation on the boiler pressure vessel
is required. Adding insulation may damage the
boiler and its components.
2. Feedwater 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 temperature of
the pump.
3. Blowoff vessels should
not
be insulated.
4. Equipment should be insulated with material
suitable for the application and temperatures
expected.
System Interfaces
Refer to System Diagram (Figure 13).
CONDENSATE RETURN FEEDWATER TANK
Where an atmospheric condensate return feedwater
tank is to be fitted, adhere to the following:
1. Vent to a safe location.
2. Boiler feed tank shall have a capacity sufficient
to satisfy boiler consumption as well as maintain
proper feedwater tank temperature. Capacity
should provide a minimum of 10 minutes of
storage. Boiler pump is to provide a capacity of
2.5 times the evaporation rate for on/off pumps
and 1.5 times the evaporation rate for continuous
running pumps. The discharge pressure of the
pump must be 3% over the boiler safety valve
setting and include the necessary additional
pressure to overcome piping losses.
3. See
Feedwater Instruction Manuals
for detailed
instructions.
THE FEED WATER PIPING
Where the feed water piping is to be fitted, adhere to
the following:
1. Size makeup water piping adequately to provide
proper water supply. Do not reduce feedwater
piping smaller than supplied line size. Depending
on installation, feedwater piping may need to be
larger to minimize pressure drop of feedwater
piping.
2. Do not use the feed water pump as a support
for the feed water piping. This could add undue
strain to the pump head. Use proper piping
supports as necessary to support feed water
piping.
3. Do not use stainless steel within the Boiler
External Piping (BEP) boundary.
4. Ensure all piping is done in compliance with all
applicable codes.
5. See
Feedwater Instruction Manuals
for detailed
instructions.
BLOWDOWN TANK
Where a blowdown tank is to be fitted, adhere to the
following:
1. Vent to a safe location.
2. Have a capacity sufficient to satisfy boiler blow-
off, as well as maintain proper drain temperature.
3. Ensure compliance with all applicable codes
when determining connection piping between
the boiler and the blowdown tank.
4. Do not downsize vent pipe (this may cause
pressure build up in the blowdown tank).
5. Ensure means to control discharge to drain
temperature below140 F or maximum allowable
temperatures allowed by local jurisdiction.
6. Do not insulate the blowdown tank.