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 />
86<br />
Figure II-5<br />
Draining Steam Mains to Return Main at Same Level<br />
HP<br />
Main<br />
S<strong>up</strong>ervised<br />
Start-<strong>up</strong><br />
Valve<br />
Spira-tec<br />
Loss<br />
Detector<br />
Thermo-Dynamic<br />
Steam Trap with<br />
Integral Strainer<br />
Connector<br />
Figure II-6<br />
Trapping <strong>Hook</strong>-<strong>up</strong> for Start-<strong>up</strong> of Steam Main<br />
For s<strong>up</strong>ervised start<strong>up</strong> of steam<br />
mains, a manual bypass is fitted so<br />
that condensate can be drained by<br />
gravity while the line pressure is too<br />
low for it to be handled by the trap at<br />
an adequate rate. If a second trap is<br />
fitted in the bypass line, a similar<br />
hook<strong>up</strong> is obtained which is suitable<br />
for automatic start<strong>up</strong>.<br />
Often the normal trap discharges to a<br />
return line at higher elevation. The<br />
start<strong>up</strong> trap must always discharge<br />
by gravity so here it is separated from<br />
the “normal running” trap. A<br />
Thermoton is used so that it will close<br />
automatically when the condensate<br />
temperature shows that warm <strong>up</strong> of<br />
the main is nearing completion.<br />
Check<br />
Valve<br />
Condensate<br />
Main<br />
Figure II-7<br />
<strong>Hook</strong>-<strong>up</strong> with Condensate Return Line at High Level<br />
S<strong>up</strong>ervised<br />
Start-<strong>up</strong><br />
Valve<br />
Check<br />
Valve<br />
Float &<br />
Thermostatic<br />
Steam Trap<br />
Liquid Expansion<br />
Steam Trap<br />
Both HP and LP mains often must be<br />
drained to a condensate return line at<br />
the same elevation as the steam line.<br />
The best location for the traps is then<br />
below the steam line, with a riser<br />
after the trap to the top of the return<br />
line.<br />
Spira-tec<br />
Loss<br />
Detector<br />
Spira-tec<br />
Loss<br />
Detector<br />
Spira-tec<br />
Loss<br />
Detector<br />
Spira-tec<br />
Loss<br />
Detector<br />
Drain<br />
Strainer<br />
Thermo-Dynamic Steam<br />
Trap with Integral Strainer<br />
Thermo-Dynamic<br />
Steam Trap<br />
with Integral<br />
Strainer<br />
Check<br />
Valve<br />
Thermo-Dynamic<br />
Steam Trap<br />
with Integral<br />
Strainer<br />
LP<br />
Main<br />
Condensate<br />
Return