2000 Hook-up Book

Figure II-1 Boiler Steam Header

From Boiler

To Plant

Thermo Dynamic

Thermo Dynamic

Spira-tec Loss Detector

Spira-tec Loss Detector

Supervised Start-up Valve

Steam Trap with Integral Strainer

Steam Trap with Integral Strainer

HOOK-UP DIAGRAMS

over from the boiler. These two loca tions form the exception to the general rule that mains drip points rarely need a steam trap as large as the 1/2" size and can usually be fitted with 1/2" Low Capacity traps. Instead, traps in 3/4" and even 1" sizes are often used. The potential for steam losses when these larger traps eventually become worn is increased, and the use of Spira-tec steam trap monitors is especially valid.

Boiler Steam Headers provide collect ing vessels for the steam flowing from one or more boilers, and distribute it to as many mains as are needed to sup ply the plant. Often the flow may be in either direction along the header depending on which boilers and which supply lines are being used. Selecting the ideal location for the drip point is thus complicated. It is recommended to make the header of such an

increased diameter as to drop the steam velocity through it to a low value even with maximum flow in either direction. The header can then act also as a separator, and generously sized steam traps can be fitted at each end. The boiler header and the separator, which should be fitted in the steam take off from modern high perfor mance packaged boilers, may sometimes have to cope with carry

LP Steam Main

Float & Thermostatic Steam Trap

In the case of low pressure mains, the use of Float and Thermostatic traps is recommended for the drip stations. The introduction of F & T traps with steel bodies, third gen eration capsule type or bimetallic air vents, and operating mecha nisms suitable for pressures up to 465 psi, means that F & T traps can also be used on properly drained lines where waterhammer does not occur, even at pressures which would formerly have exclud ed them. An auxiliary air vent is recommended for the end of all mains where the system is started up automatically.

Strainer

Spira-tec Loss Detector

Supervised Start-up Valve

Condensate Return

Figure II-2 Draining End of Low Pressure Steam Main

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