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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

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