Pipeline ancillaries Hosedown stations
10
Sizes and capacities The graphs indicate the maximum flow of hot water at various temperatures for a given steam supply pressure. The bold lines show the maximum cold water flow for a given water supply pressure. When sizing the valve, ascertain the hot water temperature and quantity required, and the cold water and steam pressures available. Plot the cold water supply pressure and read off from the bold line the maximum flow of cold water. Plot the steam supply pressure against the hot water temperature required and read off the maximum flow of heated water. For sizing purposes always select the lowest of the two values because depending on the supply pressures, there can be an imbalance in the amount of either water or steam heat available. The effect of selecting different supply pressures or different sizes of valve can easily be compared. Example
For a cold water supply pressure of 3 bar g the maximum flow of cold water is 40 l/min. For a steam supply pressure of 6 bar g the maximum flow of hot water at 50 °C is 46 l/min.
Capacities
Litres/minute
½"
Example: Maximum flow of heated water
Example: Maximum flow of cold water
Supply pressure bar g
Example : Cold water supply
Steam supply
1"
¾"
10.13 8
Supply pressure bar g
Supply pressure bar g
1½"
Supply pressure bar g
TI-P157-06 CMGT Issue 10
Page 4 of 5
Steam/Water Mixing Stations - Mk II Valve
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