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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.

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