FP USER INSTRUCTIONS ENGLISH 71576286 - 07/06

4.5.2 Suction piping

4.5.2.1Design of a flooded suction line The suction line must be as short and direct as possible, never mount an elbow directly on the inlet flange of the pump.

Valve

Non-return valve

Continous flow valve

Flooded suction configuration

a)Avoid sharp elbows or sudden narrowing. Use convergent 20° (total angle).

b)Arrange the pipework so that there are no air pockets (no bulges).

c)If high points cannot be avoided in suction line, provide them with air relief cocks.

d)If a strainer is necessary, its net area should be three or four times the area of the suction pipe.

e)If an inlet valve is necessary, choose a model with direct crossing.

Do not tighten flanges before the final check (see § 4.5.4).

4.5.2.2 Design of a suction lift line

The inlet pipe must be as short and as direct as possible, never place an elbow directly on the pump inlet nozzle.

Valve

Non-return valve

I:

SUFFICIENT IMMERSION

Valve strainer

I 3 x D

Sump suction configuration

a)Avoid sharp elbows or sudden narrowing. Use convergent 20° (total angle) with upright generating.

b)Arrange that the suction pipework is inclined upwards towards the pump ensuring that there are no peaks.

c)If a foot valve is necessary, do not oversize it because it would generate pulsations (valve beating).

Do not tighten flanges before the final check (see § 4.5.4).

4.5.3 Discharge piping

4.5.3.1 Design of a discharge line

a)If discharge line is provided with a divergent, its total angle will be between 7° and 12°.

b)Install the discharge valve after the non-return valve downstream.

c)The non-return valve will be set in the discharge pipe to protect the pump from any excessive pressure surge and from reverse rotation.

If necessary, a control manometer can be connected on the pipework .

Control manometer

Setting of the control manometer

Do not tighten flanges before the final check (see § 4.5.4).

4.5.4 Final checks

a)Check the tightening of anchor bolts. Tighten them if necessary.

b)Check that protective covers on suction and discharge flanges are removed.

c)Check that holes of pipework flanges are parallel and correspond to those of the pump.

d)Tighten suction and discharge flanges.

4.6 Electrical connections

Electrical connections must be made by a qualified Electrician in accordance with relevant local national and international regulations. This includes any grounding.

It is important to be aware of the EUROPEAN DIRECTIVE on potentially explosive areas where compliance with IEC60079-14 is an additional requirement for making electrical connections.

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