035-000029-001
Page 28
HHA IOM 1.4 10/11/2021
NOTES:
1.
Flange or union is located to facilitate coil
removal.
2.
When a bypass with control is required.
3.
Flash trap can be used if pressure differential
between supply and condensate return ex-
ceeds 5 psi.
4.
Coils with different pressure drops require
individual traps. This is often caused by vary-
ing air velocities across the coil bank.
5.
Dirt leg may be replaced with a strainer. If
so, tee on drop can be replaced by a reduc-
ing ell.
6.
The petcock is not necessary with a bucket
trap or any trap which has provision for pass-
ing air. The great majority of high pressure
return mains terminate in hot wells or deaer-
ators which vent the air.
Fig. 9 — Multiple Coil High Pressure Piping
NOTES:
1.
Flange or union is located to facilitate coil re-
moval.
2.
When control valve is omitted on multiple coils
in parallel air flow.
3.
When a bypass with control is required.
4.
Coils with different pressure drops require in-
dividual traps. This is often caused by varying
air velocities across the coil bank.
Fig. 10 — Multiple Coil Low Pressure
Piping Gravity Return
NOTES:
1. Flange or union is located to facilitate coil removal.
2. To avoid water hammer, drain coil before admitting steam.
3. Do not exceed one foot of lift between trap discharge and return
main for each pound of pressure differential.
4. Do not use this arrangement for units handling outside air.
Fig. 11 — Multiple Coil Low Pressure Piping
Gravity Return
INSTALLATION-Piping (cont’d)
Содержание HHA Series
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