▪ Incorporate a pressure gauge in the inlet pipeline to determine that the dry
pumping system operates correctly.
▪ The dry pumping system inlet must be able to be isolated from the
atmosphere and the vacuum system if pumping or producing corrosive
chemicals.
▪ The outlet of the exhaust pipe can have a check valve fitted which prevents
the suck
‑back of exhaust vapour after the dry pumping system is shut down.
The check valve also provides additional attenuation of the pulses in exhaust
pressure.
▪ For all the dry pumping systems, there is a limit to the length of NW50 pipeline
that can be used between the pump exhaust connection and the facility
exhaust. For the dry pumping systems with a check valve, the length of the
pipeline is limited to 1 metre. For the dry pumping systems without a check
valve, the length is limited to 3 metres. If these lengths are exceeded, the
pump will trip out due to high exhaust pressure. If the distance to the facility
exhaust is greater than these limits, consider using an adaptor on the pump
exhaust and a larger diameter pipeline.
▪ For pumps running on dusty processes, we recommend that the exhaust line
is cleaned regularly as part of routine maintenance. Accumulation of dust in
the exhaust line can reduce conductance and therefore increase exhaust
pressure which may damage the pump. The frequency of exhaust line
cleaning depends on the process. On very dusty applications, use a low-
impedance inlet filter to reduce maintenance requirements.
1. Referring to Figure: Connecting the pump inlet, remove the temporary cover
or blanking plate from the inlet of the dry pumping system. Take care not to
drop screws, tools and so forth into the pump inlet. Retain the nuts, bolts,
washers and blanking plate for future use. Retain the temporary cover for
future use on non‑
contaminated pumps only. The inlet O‑ring is supplied with
the pump, it is fitted underneath the inlet flange cover.
2. Use the O-ring supplied and suitable nuts, bolts and washers (not supplied) to
connect the inlet flange (Front view on page 1
1) to the vacuum system. The
inlet flange is not designed for use with a trapped O-ring or centring ring. Use
our half claw clamps when connecting an ISO style foreline flange to the dry
pumping system inlet. Refer to Figure: Connecting the pump inlet.
3. Use the trapped O-ring and clamp supplied to connect the exhaust outlet
(Front view on page 1
1 or Side view on page 12) to the exhaust extraction
system.
Installation
07/2021 - ©Atlas CopcoPage 881950840208_A
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