IOM/UP_METRIC Issue Date: 31/12/2007
Page 27 of 66
Last Revision: 12/06/2012
5.8 Coupling Details
Pumps will be supplied with snap wrap coupling as a standard scope of supply
however other types like pin bush, tyre type, spacer coupling can also be provide on
request.
5.9 Minimum safe flow
The pump should not run against closed discharge valve as this will cause an
increase in temperature/formation of steam in the pump. This may cause shaft
damage, impeller erosion, short life of bearings and damage to stuffing boxes or
mechanical shaft seals due to stress or vibration. The minimum flow rate must be at
least 30 % of the best efficiency point flow rate.
5.10 NPSHA (Net Positive Suction Head Available) and NPSHR (Net Positive Suction Head
Required)
NPSHA should be at least greater than 0.5m than NPSHR for satisfactory operation
of the pump. If NPSHA<NPSHR then pump cavitation may occurs which in turns
damage the impeller.
5.11 Pipe line velocities
For satisfactory operation of pumps and to minimize frictional losses, it is
recommended to maintain velocity in suction pipe line as 1.5 to 2 m/s and in
delivery pipe line it should be 2.5 to 3 m/s by providing higher pipe diameters than
pump suction / delivery size.
5.12
Tapping details:
Sr.No
Tapping Description
Size (in inch)
1
2
3
4
5
Air vent
Priming
connection
(plugged)
Sealing connection
Suction
&
delivery
pressure
gauge
connection (plugged)
Casing drain
Rp 3/8
Rp 1/2
Rp 1/4
Rp 3/8
Rp 1/2
Summary of Contents for 8 UP 200/38
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