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Horizontal End Suction Pump for Chemical Process, ASME B73.1-2001
Installation, Operation, and Maintenance Manual – CPP21
SECTION SEVEN - OPERATION
7.1 PRIMING
Pumps handling hot (>500 °F, >260 °C) fluids must be gradually preheated to operating temperature. The most
common method used for warming a pump, or maintaining a standby pump in a warm condition, is the use of a
warming line and orifice, thus circulating the hot pumpage through the idle pump.
• It is recommended that the pump be warmed at the rate of 100 °F (55 °C) rise
per hour for normal warming, or 268 °F (149 °C) rise per hour for emergency
warming.
• It recommended that the idle pump temperature be maintained within 36 °F
(20 °C) of the system operating temperature.
Circulation can be easily accomplished by guiding a small amount of flow from the discharge side of the system
beyond the check valve via a multiple breakdown orifice into the bottom of the pump case. The hot liquid will
then pass through the case and out the suction and return to some low pressure point in the system. In many
cases, the pump drain line is used for the warming connection.
Note: Many variations are possible and one that is compatible with the customer’s particular installation should
be considered.
7.2 STARTUP
• Every time before the pump is started up the safety devices must be mounted
and fastened.
• In order to avoid risks of injury or damage, all pump units must be equipped
with emergency-stop devices.
• For operation of electrical drives, control systems and their cable routes, the
safety instructions issued by their manufacturers must be observed.
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