Spirax Sarco 37D, Installation And Maintenance Instructions Manual

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IM-P102-04 CTLS Issue 7
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2.2 General arrangement
Fig. 2 shows the recommended installation layout to ensure satisfactory operation of the Type 37D and 37DE
temperature control. It should always be fitted in a horizontal pipeline with the main diaphragm chamber
below the line.
2.3 Pipeline sizing
The piping on both sides of the valve must be sized so that velocities do not exceed 30 m/s (98 ft/s). This
means that a properly sized valve will often be smaller than the connecting pipework.
2.4 Pipeline stresses
Line stresses such as could be caused by expansion or inadequate support should not be imposed on the
valve body.
2.5 Isolating valves
These should preferably be of the fullway type.
2.6 Removal of condensate
Ensure that the pipework is adequately drained so that the valve is supplied with dry steam.
The ideal arrangement is to fit a separator in the steam supply. If the steam is known to be dry then a drain
pocket may be adequate.
If there is a rise in the low pressure line from the valve then a further drain point should be provided to keep
the valve drained after shutdown.
2.7 Preventing dirt
The valve should be protected by a pipeline strainer with 100 mesh screen. The strainer should be fitted on
its side to prevent the accumulation of water.
2.8 Temperature ranges
The temperature control system is available in five temperature ranges as follows:
Range A 16 °C to 49 °C (61 °F - 120 °F)
Range B 38 °C to 71 °C (100 °F - 160 °F)
Range C 49 °C to 82 °C (120 °F - 180 °F)
Range D 71 °C to 104 °C (160 °F - 219 °F)
Range E 93 °C to 127 °C (199 °F - 261 °F)