Edwards nXDS15i User Manual

4.5 Connect to the vacuum system
WARNING:
If pumping dang
erous gases or vapours, connect the exhaust to a suitable treatment
plant to prevent the discharge of dangerous gases and vapours to the surrounding
atmosphere.
If the pump is operated with the exhaust line blocked, high pressure may be
generated in the exhaust line pipework.
Refer to Figure: nXDS scroll pump on page 11. Before connecng the pump to the
vacuum system, remove the plasc cap from the inlet and exhaust, and ensure that the
inlet strainer is ed to the pump inlet port. Use appropriate NW25 vacuum ngs for
connecon to the system.
Take note of the following informaon when connecng the pump to the vacuum
system:
▪ To minimise noise and exhaust emissions, it is recommended that the pump is
connected to an exhaust line or a silencer (refer to Spares and accessories on page
48).
▪ For opmum pumping speeds, ensur
e that the pipeline connected to the pump
inlet is as short as possible and has a suitable internal diameter.
▪ Support the vacuum pipeline to prevent loading of the coupling joints.
▪ A pressure of 3 bar(g) may be generated in the exhaust pipework if the pump is
operated with the exhaust line blocked. Connect the pump using appropriate
pipework and ngs.
▪ If necessary, incorporate exible bellows in the system pipelines to reduce the
transmission of vibraon and to prevent loading of the coupling joints. If using
exible bellows, ensure that bellows have a maximum pressure rang which is
greater than the highest pressure that can be generated in the system.
Manufacturer's bellows are recommended.
▪ Incorporate an inlet isolaon v
alve in the pipeline from the vacuum system to the
pump to isolate the vacuum system from the pump when it is switched o and
prevent suck‑back of process gases and debris into the vacuum system.
▪ Ensure that the sealing surfaces are clean and scratch‑free.
We recommend you to use an exhaust extracon system suitable for use with all process
gases that will be pumped. Ensure that the exhaust extracon system cannot become
blocked or obstructed when the pump is operang.
A small amount of p seal wear product may collect in the exhaust duct of the pump.
The dust may be blown out with the inial burst of air aer the pump has been vented.
This is quite common and the amount of dust seen will reduce over me.
Leak test the system and seal any leaks found aer pump installaon.
Page 28
A73501880_G - Ins
tallaon

Edwards nXDS15i Specifications

General

Brand	Edwards
Model	nXDS15i
Category	Water Pump
Language	English