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 />
84<br />
Figure II-1<br />
Boiler Steam Header<br />
Boiler Steam Headers provide collecting<br />
vessels for the steam flowing from<br />
one or more boilers, and distribute it to<br />
as many mains as are needed to s<strong>up</strong>ply<br />
the plant. Often the flow may be in<br />
either direction along the header<br />
depending on which boilers and which<br />
s<strong>up</strong>ply lines are being used. Selecting<br />
the ideal location for the drip point is<br />
thus complicated. It is recommended<br />
to make the header of such an<br />
LP Steam Main<br />
Spira-tec<br />
Loss<br />
Detector<br />
S<strong>up</strong>ervised<br />
Start-<strong>up</strong><br />
Valve<br />
Figure II-2<br />
Draining End of Low Pressure Steam Main<br />
Thermo-<br />
Dynamic<br />
Steam Trap<br />
with Integral<br />
Strainer<br />
Strainer<br />
Spira-tec<br />
Loss<br />
Detector<br />
To Plant<br />
Float &<br />
Thermostatic<br />
Steam Trap<br />
Thermo-<br />
Dynamic<br />
Steam Trap<br />
with Integral<br />
Strainer<br />
increased diameter as to drop the<br />
steam velocity through it to a low value<br />
even with maximum flow in either<br />
direction. The header can then act also<br />
as a separator, and generously sized<br />
steam traps can be fitted at each end.<br />
The boiler header and the separator,<br />
which should be fitted in the steam<br />
take off from modern high performance<br />
packaged boilers, may<br />
sometimes have to cope with carry-<br />
Condensate<br />
Return<br />
Spira-tec<br />
Loss<br />
Detector<br />
From<br />
Boiler<br />
S<strong>up</strong>ervised<br />
Start-<strong>up</strong><br />
Valve<br />
over from the boiler. These two locations<br />
form the exception to the general<br />
rule that mains drip points rarely need<br />
a steam trap as large as the 1/2" size<br />
and can usually be fitted with 1/2" Low<br />
Capacity traps. Instead, traps in 3/4"<br />
and even 1" sizes are often used. The<br />
potential for steam losses when these<br />
larger traps eventually become worn is<br />
increased, and the use of Spira-tec<br />
steam trap monitors is especially valid.<br />
In the case of low pressure mains,<br />
the use of Float and Thermostatic<br />
traps is recommended for the drip<br />
stations. The introduction of F & T<br />
traps with steel bodies, third generation<br />
capsule type or bimetallic<br />
air vents, and operating mechanisms<br />
suitable for pressures <strong>up</strong> to<br />
465 psi, means that F & T traps<br />
can also be used on properly<br />
drained lines where waterhammer<br />
does not occur, even at pressures<br />
which would formerly have excluded<br />
them. An auxiliary air vent is<br />
recommended for the end of all<br />
mains where the system is started<br />
<strong>up</strong> automatically.