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N4 65-125C/A
Инструкция по эксплуатации Страница: 10

CALPEDA N4 65-125C/A [10/44] Pipe work

3. Pipe-work

The inside diameter of pipes depends on the deli-

very required.

The diameter should be determined so that the

liquid flow velocity will not exceed 1.5 m/sec in the

suction pipe and 3 m/sec in the delivery pipe. In

any case, pipe diameters must never be smaller

than the diameter of pump connection ports.

Minimum internal diameters (DN) of suction

pipes for different capacities (Q) are indicated in

the table below.

DN mm 50 65 80 100 125 150 200 250 300

Q max m

/h 10,5 19 28,8 45 75 108 215 350 508

The suction pipe must be perfectly air-tight and

lead upwards so as to avoid formation of air po-

ckets.

If a suction gate valve is mounted, the handwheel

must be positioned horizontally.

Use an eccentric transition piece to join the suction

connection with a horizontal pipe of larger diameter

(fig. 4).

For suction operation, a foot valve with strainer

(constantly immersed) must be fitted.

For suction from a storage tank, a check valve

must be fitted.

For operation with positive suction head, a gate

valve must be fitted.

Follow local specifications if network pressure is to

be increased.

Fit a gate valve into the delivery pipe to adjust

delivery, head and absorbed power. Install a pres-

sure gauge.

When the geodetic head at delivery is above 15 m,

insert a check valve between the pump and gate

valve to protect the pump against water hamme-

ring.

3.1. Connecting the pipe-work

o not use the pump to support pipes. Pipes

must be anchored on their own supports (fig. 4).

Pipes must be modified if they do not correspond

exactly with th eposition of connections to avoid

transmission of stress to the pump.

Position correctly any compensators (flexible expan-

sion joints) for absorption of expansion or vibration.

ATTENTION: forces and moments acting on

the pump flanges due to pipe loads may cause

misalignment of pump and driver shafts,

deformation and overstressing of pump ca-

sing, or overstressing of the fixing bolts

between pump and baseplate.

For connection of pipes to the flanged connection

ports, use standardized, circular counter-flanges

(type PN 10 or PN 16 up to DN 150).

During installation, make sure the gaskets between

flanges do not protrude inside pipes.

Make sure the inside of the pipe is clean before

connection.

In a new pipeline (especially when a suction strai-

ner is not fitted), insert a conical-type temporary

strainer on the suction side of the pump to prevent

solids (e.g. welding slags and scale) from entering

the pump. It is advisable to use a strainer with 20-

12,5 mesh (number of openings per linear inch)

and a free area at least three times greater than

the pipe inlet area (fig. 5).

4. Alignment of pump-motor unit

The pump-motor units positioned on a baseplate

and with a flexible coupling are aligned before lea-

ving the factory

The pump and motor assembly can lose align-

ment during shipping. Final alignment must be

accomplished in the field.

After installation is completed with tigh-

tening of anchor bolts and connection of

pipes, alignment of the coupling must

be rechecked before starting the pump.

If necessary, the unit must be re-aligned.

4.1. Pump motor unit with

N-EUPEX

coupling

Remove the coupling guard and with a dial indica-

tor or thickness gauge, make sure the distance (3-4

mm) between the halfcouplings is the same along

the entire periphery.

With a dial indicator or straight edge, check the alignment

(coaxiality) of the external part of the halfcouplings.

Avoid formation of air pockets in suction

pipe:

a) eccentric transition piece;

b) gate valve with horizontal handwheel;

c) pipe leading upwards.

Avoid trasmission of stress to the pump:

d) supports and anchoring of pipes.

Fig. 4 Connection of pipes.

Fig. 5 Conical-type temporary

strainer on the suction side.

4.93.040

pump

4.93.037

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3 Pipe work 3 1 Connecting the pipe work The inside diameter of pipes depends on the deli very required The diameter should be determined so that the liquid flow velocity will not exceed 1 5 m sec in the suction pipe and 3 m sec in the delivery pipe In any case pipe diameters must never be smaller than the diameter of pump connection ports Do not use the pump to support pipes Pipes must be anchored on their own supports fig 4 Pipes must be modified if they do not correspond exactly with th eposition of connections to avoid transmission of stress to the pump Position correctly any compensators flexible expan sion joints for absorption of expansion or vibration Minimum internal pipes for different the table below diameters DN capacities Q are of suction indicated in DN mm 50 65 80 100 125 150 200 250 300 Qmax m7h 10 5 19 28 8 45 75 108 215 350 508 The suction pipe must be perfectly air tight and lead upwards so as to avoid formation of air po ckets If a suction gate valve is mounted the handwheel must be positioned horizontally Use an eccentric transition piece to join the suction connection with a horizontal pipe of larger diameter fig 4 ATTENTION forces and moments acting on the pump flanges due to pipe loads may cause misalignment of pump and driver shafts deformation and overstressing of pump ca sing or overstressing of the fixing bolts between pump and baseplate For connection of pipes to the flanged connection ports use standardized circular counter flanges type PN 10orPN 16 upto DN 150 During installation make sure the gaskets between flanges do not protrude inside pipes Make sure the inside of the pipe is clean before connection In a new pipeline especially when a suction strai ner is not fitted insert a conical type temporary strainer on the suction side of the pump to prevent solids e g welding slags and scale from entering the pump It is advisable to use a strainer with 2012 5 mesh number of openings per linear inch and a free area at least three times greater than the pipe inlet area fig 5 _ Ik Avoid formation of air pockets in suction pipe a eccentric transition piece bj gate valve with horizontal handwheel c pipe leading upwards Avoid trasmission of stress to the pump d supports and anchoring of pipes Fig 4 Connection of pipes For suction operation a foot valve with strainer constantly immersed must be fitted For suction from a storage tank a check valve must be fitted For operation with positive suction head a gate valve must be fitted Follow local specifications if network pressure is to be increased Fit a gate valve into the delivery pipe to adjust delivery head and absorbed power Install a pres sure gauge When the geodetic head at delivery is above 15 m insert a check valve between the pump and gate valve to protect the pump against water hamme ring 10 Fig 5 Conical type temporary strainer on the suction side pump 4 Alignment of pump motor unit The pump motor units positioned on a baseplate and with a flexible coupling are aligned before lea ving the factory The pump and motor assembly can lose align ment during shipping Final alignment must be accomplished in the field After installation is completed with tigh tening of anchor bolts and connection of pipes alignment of the coupling must be rechecked before starting the pump If necessary the unit must be re aligned A 4 1 Pump motor coupling unit with N EUPEX Remove the coupling guard and with a dial indica tor or thickness gauge make sure the distance 3 4 mm between the halfcouplings is the same along the entire periphery With a dial indicator or straight edge check the alignment coaxiality of the external part of the halfcouplings

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