2000 Hook-up Book - Spirax Sarco
2000 Hook-up Book - Spirax Sarco
2000 Hook-up Book - Spirax Sarco
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HOOK-UP DIAGRAMS<br />
92<br />
Figure II-18<br />
25 BP Back Pressure Controls used to Restrict S<strong>up</strong>ply to Low Priority Uses at Times of Overload<br />
Pilot Operated<br />
Back Pressure Valve<br />
Steam to<br />
Non-essential<br />
Service<br />
Steam S<strong>up</strong>ply<br />
from Boiler<br />
Strainer<br />
Header<br />
At times of peak draw off, boilers which have sufficient<br />
capacity to meet average load conditions may become overloaded.<br />
This can cause carryover and priming, or even<br />
lockout of boilers on low water. The pressure in the steam<br />
lines falls and essential services may be interr<strong>up</strong>ted. The<br />
use of back pressure controls in the s<strong>up</strong>plies to non-essential<br />
loads allows these to be automatically shut down, in<br />
order of priority, at peak load times while maintaining s<strong>up</strong>ply<br />
to more important loads.<br />
Strainer<br />
Figure II-19<br />
Reducing Steam Pressure Using 25PA Control Valve with Remote Air Valve<br />
Steam<br />
S<strong>up</strong>ply<br />
Moisture<br />
Separator<br />
Strainer<br />
Spira-tec<br />
Loss<br />
Detector<br />
Strainer<br />
Float &<br />
Thermostatic<br />
Steam Trap<br />
Air Loaded<br />
Pilot<br />
Air Operated<br />
Control Valve<br />
Check<br />
Valve<br />
10 Pipe Diameters<br />
Minimum from<br />
Valve Outlet<br />
Pressure<br />
Sensing Line<br />
Pitch Down<br />
Pilot Operated<br />
Pressure Reducing<br />
and Back Pressure<br />
Valve<br />
Spira-tec<br />
Loss<br />
Detector<br />
Steam to<br />
Priority Use<br />
Thermo-<br />
Dynamic<br />
Steam Trap<br />
with Integral<br />
Safety<br />
Valve<br />
Filter/Regulator<br />
Drip<br />
Pan<br />
Elbow<br />
Safety<br />
Valve<br />
Reduced<br />
Steam<br />
Pressure<br />
Air<br />
S<strong>up</strong>ply<br />
Drip<br />
Pan<br />
Elbow<br />
Reduced Steam<br />
Pressure to<br />
Non-essential Service<br />
Depending on pilot selected, reduced<br />
steam pressure will be approximately 1:1,<br />
4:1 or 6:1 times the air loading pressure<br />
sent to the pilot.
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