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PLEUGER STANDARD USER INSTRUCTIONS ENGLISH 71569293 01-13

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1.6.4.3 Avoiding excessive surface temperatures

ENSURE THE EQUIPMENT TEMPERATURE

CLASS IS SUITABLE FOR THE HAZARD ZONE

Pumps have a temperature class as stated in the

ATEX Ex rating on the nameplate. These are based

on a maximum ambient of 40 ºC (104 ºF); refer to

Flowserve for higher ambient temperatures.

The surface temperature on the pump is influenced

by the temperature of the liquid handled. The

maximum permissible liquid temperature depends on

the ATEX temperature class and must not exceed the

values in the table that follows:

Table 1: Maximum permitted liquid temperature for

pumps

Temperature class

to EN13463-1

Maximum surface

temperature permitted

Temperature limit of

liquid handled *

85 °C (185 °F)

100 °C (212 °F)

135 °C (275 °F)

200 °C (392 °F)

300 °C (572 °F)

450 °C (842 °F)

Consult Flowserve

115 °C (239 °F) *

180 °C (356 °F) *

275 °C (527 °F) *

400 °C (752 °F) *

* The table only takes the ATEX temperature class into consideration.

Pump design or material, as well as component design or material,

may further limit the maximum working temperature of the liquid.

The temperature rise at the seals and bearings and

due to the minimum permitted flow rate is taken into

account in the temperatures stated.

The operator is responsible for ensuring that the

specified maximum liquid temperature is not

exceeded.

Temperature classification “Tx” is used when the liquid

temperature varies and when the pump is required to be

used in differently classified potentially explosive

atmospheres. In this case the user is responsible for

ensuring that the pump surface temperature does not

exceed that permitted in its actual installed location.

Avoid mechanical, hydraulic or electrical overload by

using motor overload trips, temperature monitors or a

power monitor and make routine vibration monitoring

checks.

A vibration check must be carried out routinely. We

recommend a measurement every 4 weeks.

In dirty or dusty environments, make regular checks

and remove dirt from areas around close clearances,

bearing housings and motors.

Where there is any risk of the pump being run against a

closed valve generating high liquid and casing external

surface temperatures fit an external surface

temperature protection device.

For pumps with key drive impellers only

If an explosive atmosphere exists during the

installation, do not attempt to check the direction of

rotation by starting the pump unfilled. Even a short

run time may give a high temperature resulting from

contact between rotating and stationary components.

1.6.4.4 Preventing the build-up of explosive

mixtures

ENSURE THE PUMP IS PROPERLY FILLED

AND VENTED AND DOES NOT RUN DRY

Ensure the pump and relevant suction and discharge

pipeline system is totally filled with liquid at all times

during the pump operation, so that an explosive

atmosphere is prevented.

In addition it is essential to make sure that seal

chambers, auxiliary shaft seal systems and any

heating and cooling systems are properly filled.

If the operation of the system cannot avoid this

condition, fit an appropriate dry run protection device

(for example liquid detection or a power monitor).

To avoid potential hazards from fugitive emissions of

vapour or gas to atmosphere the surrounding area

must be well ventilated.

1.6.4.5 Preventing sparks

To avoid the potential hazard from random

induced current generating a spark, the baseplate

must be properly grounded.

Avoid electrostatic charge: do not rub non-metallic

surfaces with a dry cloth; ensure cloth is damp.

1.6.4.6 Preventing leakage

The pump must only be used to handle liquids

for which it has been approved to have the correct

corrosion resistance.

Avoid entrapment of liquid in the pump and associated

piping due to closing of suction and discharge valves,

which could cause dangerous excessive pressures to

occur if there is heat input to the liquid. This can occur if

the pump is stationary or running.

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