Inlet Circuit - Bertolini C 300 Serie Manual De Usuario

shaft.
 In case of drive by pulleys check:
– There is not any gap between shafts and pulleys.
– The pulleys are parallel and aligned.
–
The belts are strained with the correct value. An excessive strain of the belts will lead
to a premature wear of the bearings.

4.2 INLET CIRCUIT

 The design of the inlet circuit must be done in order to prevent the cavitation. In the follow-
ing chapter 5.2 D is described how to dimension the inlet circuit. In any case it is neces-
sary to verify with a pressure device or a pressure gauge in the inlet fitting of the pump
(point 7 in the installation scheme), that the pressure doesn't fall under -0,2 bar.
 The inlet line must have a filter with a filtering degree between 50 and 80 mesh as indicat-
ed in the chapter 5.2B. The filter produces a hydraulic loss that reduces the pump suction
capacity. For this reason the filter must have an appropriate flow rate. It is recommended
to use a filter with a capacity 2,5 times the pump flow rate.
 The inlet pressure of the pump does not have to exceed 5 bar.
 The diameter of the filter pipes must not be lower than the diameter of the pump inlet
pipes.
 The filter must be installed as close as possible to the pump in an easily accessible posi-
tion, and must be inspected before each pump starting.
 In case of pressure feed through a centrifugal pump, make sure the provided capacity is at
least 1.5 times more than the pump capacity.
 In case of feed from a tank follow these instructions:
The tank must have a minimum capacity of four times the pump capacity per minute.
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The pump inlet pipes must be located near the bottom of the tank, with a water head of at
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least 200 mm, avoiding the formations of siphons.
The suction area must be protected by turbulence caused by the tank feeding pipe, and
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by the return pipelines, through special bottom closed bulkheads.
The tank must be provided with the safety devices indicated in the chapters 5.2 E and 5.2
F.
We suggest carrying out the piece of pipeline directly next to the pump with flexible hoses,
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suitable to isolate the rest of the system from the vibrations caused by the pump-
engine/motor unit.
Use only stiff or flexible strengthen pipes for anti-deflection.
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The inlet pipelines must be as straight as possible, reducing as much as possible curves,
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elbows and rough fluctuations of section.
Do not use oil-pressure pipe fittings, 90° elbows, fittings with multiple ways, wing nuts etc.
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Do not use foot or one-way valves.
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Do not install devices for detergent sucking in the inlet circuit of the pump.
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 Make sure the inlet line, before being connected to the pump, is perfectly clean inside.
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