Piping Requirements - Xylem LOWARA ESH S Serie Manual De Instalación, Funcionamiento Y Mantenimiento

In accordance with Directive 1999/92/EC, this
product is applicable for use in zone 1 and zone 2
areas only.
DANGER: Explosion/Fire Hazard
Special rules apply to installations in
explosive or flammable atmospheres.
Do not install the product or any
auxiliary equipment in an explosive
zone unless it is rated explosion-proof
or intrinsically safe. If the product is
EN/ATEX-, MSHA or FM-approved,
then see the specific EX information in
the Safety chapter before taking any
further actions.
Guidelines
Observe the following guidelines regarding the
location of the product:

Make sure that no obstructions hinder the
normal flow of the cooling air that the
motor fan deliver.

Make sure that the installation area is
protected from
flooding.

If possible, position the pump slightly
higher than the floor level.

The ambient
between -10°C (+14°F) and +55°C
(+131°F).

The relative humidity of the ambient air
must be less than 95% at +40°C
(+104°F).

Contact Xylem
Distributor if:
- The relative air humidity conditions exceed
the guidelines.
- The room temperature
(+131°F).
- The unit is located more than 1000 m (3000
ft) above the
performance may need to be de-rated or
replaced with a more powerful motor.
For information about which value to de-rate the
motor with, see Table 8 on page 94.
Pump position and clearance
Provide adequate light and clearance around the
pump. Make sure that it is easily accessible for
installation and maintenance operations.
Installation above a liquid source (suction lift)
The theoretical maximum suction height of any pump
is 10.33 m. In practice, the following affect the
suction capacity of the pump:

Liquid temperature

Elevation above the sea level (in an open
system)

System pressure (in a closed system)

Resistance of the pipes

Own intrinsic flow resistance of the pump

Height differences
any fluid leaks, or
temperature must
or the Authorised
exceeds +55°C
sea level. The motor
The following equation is used to calculate the
maximum height above the liquid level which the
pump can be installed:
*10.2 - Z) ≥ NPSH + H
(p
b
p Barometric
b
pressure).
NPSH Value in meter of the pump intrinsic flow
resistance.
H Total losses in meters caused by passage
f
of liquid in the suction pipe of the pump.
H Steam pressure in meters that correspond
v
to the temperature of the liquid T °C.
0.5 Recommended safety margin (m).
Z Maximum height at which the pump can be
installed (m).
(p *10.2 - Z) must always be a positive number.
b
For more information, see Figure 9 on page 95.
NOTICE:
Do not exceed the pumps suction capacity as this
could cause cavitation and damage the pump.
4.2.2

Piping requirements

be
Precautions
WARNING:
NOTICE:
Observe all regulations issued by authorities
having jurisdiction and by companies managing
the public water supplies if the pump is
connected to a public water system. If required,
install appropriate backflow-prevention device on
the suction side.
Piping checklist
Check that the following requirements are met:

All piping is independently supported,
piping must not place a burden on the
unit.

Flexible pipes or unions are used, in
order to avoid transmission of pump
vibrations to the pipes and vice versa.

Use wide bends, avoid using elbows
which cause excessive flow resistance.

The suction piping is perfectly sealed and
airtight.
en - Original instructions
+ H + 0.5
f v
pressure in bar

Use pipes suited to the
maximum
pressure of the pump.
Failure to do so can cause
the system to rupture, with
the risk of injury.

Make sure that
connections are performed
by qualified installation
technicians and
compliance with
regulations in force.
(system
working
all
in
the
21