CEA 4001 - Pumps; Compartments for pumpsets

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58

other

source

or

supply.

9

9 Pumps

9.1 General

The

pump

shall

have

a

stable

H

(Q)

curve,

Pumps

shall

be

driven

either

by

electric

motors

or

diesel

engines

capable

of

providing

at

least

the

power

required

complying

with

the

following:

a)

For

pumps

with

non-overloading

power

characteristic

curves,

the

maximum

power

required

at

the

peak

of

the

power

curve;

b)

For

pumps

with

rising

power

characteristic

curves,

the

maximum

power

for

any

conditions

of

pump

load,

from

zero

flow

to

a

flow

corresponding

to

a

pump

NPSH

required

equal

to

16m

or

maximum

suction

static

head

plus

11

m.

whichever

is

greater.

The

coupling

between

the

driver

and

the

pump

of

horizontal

pumpsets

shall

be

of

a

type

which

ensures

that either

can

be

removed

independently

and

in

such

a

way

that

pump

internals

can

be

inspected

or

replaced without

affecting

suction

or

discharge

piping.

End

suction

pumps

shall

be

of

the

"back

pull-out"

type.

Pipework

shall

be

supported

independently

of

the

pump.

9.2 Multiple pump arrangements

Pumps shall have compatible characteristic curves and be capable of operating in parallel at all possible flow

rates.

Where

two

pumps

are

installed,

each

one

shall

be

capable

independently

of

providing

the

specified

flows

and

pressures.

Where

three

pumps

are

installed,

each

pump

shall

be

capable

of

providing

at

least

50%

of

the

specified

flow

at

the

specified

pressure.

Where

more

than

one

pump

is

installed

in

a

superior

or

duplicate

water

supply,

no

more

than

one

shall

be

driven

by

an

electric

motor.

(See

clause

9.8.1.1)

9.3 Compartments for pumpsets

9.3.1 General

Pumpsets

shall

be

housed

in

a

compartment

of

non-combustible

construction

having

a

fire

resistance

of

no less

than

60

min,

used

for

no

other

purpose

than

fire

protection.

It

shall

be

one

of

the

following

(in

order

of preference):

a)

A

separate

building;

b)

A

building

adjacent

to

a

sprinkler-protected

building

with

direct

access

from

outside;

c)

A

compartment

within

a

sprinkler-protected

building

with

direct

access

from

outside.

9.3.2 Sprinkler protection

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