Enovation Controls Murphy DF Series, Installation And Operation Manual

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Section 15 00-02-0831
2013-03-21 - 3 -
Typical Applications
This section covers some general situations where the rugged DF Series switches provide a
simple-to-install solution. Applications include:
Water Flood Systems Diesel Day Tanks
Crude Oil Tanks Sumps
Salt Water Disposal Systems Cooling Towers
Water Flood Control Systems
The diagram below displays eight DF Series switches installed on Raw Water and Clear Water
tanks. When raw water rises to a predetermined level, DF#1 stops the supply pump. As tank
level falls below the set level, DF#2 starts the supply pump. If the tank level continues to fall,
DF#3 initiates a shutdown of the supply pump. DF#4 stops the transfer pump before the raw
water tank is completely pumped out.
When clear water reaches the predetermined level, DF#5 stops the transfer pump. As tank
level falls to the set low level,
DF#6
starts the transfer pump. If the tank level continues to fall
due to the failure of the filters section, DF#7 initiates shutdown of the transfer pump. (A DF755
located at this level will also operate backwash equipment). DF#8 stops the injection pump
before tank pumps completely out. An OPL Series Pressure SWICHGAGE
®
stops the injection
pump when pressure reaches an established high or low pressure.
Low Pressure Gas Blanket on Tank
The level switches shown at right are installed
on a crude oil tank where a low-pressure gas
blanket is used to prevent evaporation loss.
The switches are mounted directly to the side
of the tank (or can be mounted on a riser pipe
4 to 7” [102 to 178 mm] below the level to be
controlled). The pump automatically stops or
starts when the gas liquid reaches
predetermined high or low level.
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