Edwards nES Series - Page 33

▪ Install the pump on a solid, level surface, suitable for taking its weight. Respect the
minimal distance between the pump and the walls (Refer to Dimension drawings
on page 22).
▪ Correct process lines sizes must be used to prevent restricons and resulng
pressure drops. The inlet diameter of the pump should be maintained as far into
the process as possible. Contact us for piping recommendaons.
▪ The required venlaon capacity to limit the vacuum pump room temperature can
be calculated from Qv = 0.2 N/Dt, with:
▪
Qv = required venlaon capacity in m
3
/s
▪
N = sha input of the vacuum pump in kW.
▪
Dt = temperature increase of the incoming venlaon air in the vacuum
pump room in °C
▪
Make sure all piping connecons from the pump to the point of use are leak‑ght
and secure. Leaks add load to the vacuum pump. They decrease the available
pump capacity and prevent the aainable ulmate pressure from being reached.
All welds must be vacuum compable.
▪
Vacuum rated isolaon valves must be used. Compressed air valves and vacuum
valves dier in their sealing characteriscs and compressed air valves may leak in
vacuum applicaons.
▪ All piping should be as straight as possible with non-restricve diameters. Elbows,
bends, tees and tapers should be used only when necessary.
▪
Keep the plumbing and the system free of uids, water, dirt, and debris that are
not part of the process. These can cause obstrucons in the vacuum ow through
the piping and can reduce available pumping capacity.
▪ Exhaust piping should be installed to not create addional back pressure on the
vacuum pump. Also, the exhaust piping should be installed sloping away from the
vacuum pump.
▪
A recommended alternave is the use of a drip leg with drain point provision, to
prevent condensate from running back into the uid reservoir.
▪ Take extreme care in selecng the proper inlet ltraon system for the vacuum
pump. Liquids, solids and abrasive powders must be prevented from entering the
vacuum pump to prevent mechanical failure or reduced lifeme. Inlet ltraon
must be installed on every pump. The potenal for parculate contaminaon in
rough vacuum applicaons is signicant. The parcle micron retenon of the lter
element must be smaller than the smallest possible parcle load. Also, the inlet
lter should be mounted in such a way to prevent parcles from falling into the
inlet of the vacuum pump during cleaning or changing of the lter element.
▪
If there is a risk for liquids to be drawn into the vacuum system, a liquid separator
should be used to separate these liquids from the incoming air. In applicaons
where there is a signicant amount of liquid, contact us.
▪
Keep the vacuum pump room dry and free from contaminaon.
▪
Follow recommended lubricant change schedules in normal applicaons (air) and
watch closely the condion and appearance of the uid in chemical or harsh
applicaons. Check the leak rate of the system by pumping down to the ulmate
pressure and then valve o the vacuum pump. Monitor the pressure rise for ve or
ten minutes and record this rate of rise for future reference. This value is a good
tool to have if you believe there are pump or system problems. Compare new
value with the original.
07/2020 - Page 29
A35104880_B - Installaon