My understanding of modes of vibration / failure of drive shafts is as follows
1) Torsional
2) Lateral (with/ without rotation)
3) Whirl (of shaft, not bearings)
However there seems to be a lot of confusion about what is whirl and what is lateral vibrations, some sources say they are the same...
Posted on the stainless forum, was advised to post it here...
We have the following application:
1) Various large diameter valves.
2) Various large diameter pipes / manifolds.
The fluid in question is sewage with around 30% seawater.The temperature is 20 - 30 degree C (25 average).The...
We have the following application:
1) Various large diameter valves.
2) Various large diameter pipes / manifolds.
The fluid in question is sewage with around 30% seawater.
The temperature is 20 - 30 degree C (25 average).
The chloride content is 6500 -9500 (average is 8300).
We are...
We have a squirrel cage motor that is failing on its rotor bars around 1 year after commissioning. I understand that during commissioning there were some difficulties getting the pumps to start without a “failed to start” error on the soft start, and that the pump supplier employed some...
Hello,
Generally when a dry well vertical centrifugal pump (e.g. an immersible Flygt type sewage pump or a long shaft driven centrifugal) is installed it is common practice to install a air vent in or around the stuffing box area. I understand that this is to do with removing air away from the...
We are having problems with some of our wet well submersible mixed flow (shrouded) vertical sewage pumps.
Pump end bearings are failing and the seals are failing. Motor end bearings are also failing.
The pumps are running out on the curve when they start for about ten seconds or so - a short...
I am looking to produce a practical document for use by our engineers on the application of Greywater treatment.
I am interested in the following:
1) Physical properties of raw grey water. I am in particular interested in the apparently “common knowledge” that grey water BOD content and...
Is it acceptable to use centrifugal pumps for discharging into relatively short mains that are initially empty? The kind of thing used for large drainage pumps that simply lift and dump the flow over a relatively low static head without non return valves.
I know that normally one would think of...
Is 410 stainless suitable for use on raw screened sewage applications?
This particular application is for a turbine impellor, and as such the higher strength would be desirable but the lower resitance to corrosion is not so desirable, but is it adequate for long life (say 40 -50 years)?
thanks
We have to control the flow to full treatment on a sewage plant, to a maximum of 3.25m3/s.
The existing channel is 3m wide, and due to various constraints we cant use a control valve (e.g. eccentric plug), therefore the control must be in an open channel.
Weir penstocks are not favoured due...
Is there any reliable data for estimating the max hourly production of screenings at a sewage plant inlet works screening system?
I have figures of up to 0.03m3/1000 population/day (ciwem -uk) with peaking factors of up to 29 to get the max hourly loading of the works. However I this seems to...
We are looking into the feasibility of installing a small hydro electric unit downstream of a sewage inlet works.
The system will be around 250kW. It shall be a Kaplan type reaction turbine.
Although the sewage inlet works has screens(6mm 2 dimensions)and grit removal, I still have concerns...
We are looking into the feasibility of installing a small hydro electric unit downstream of a sewage inlet works.
The system will be around 250kW. It shall be a Kaplan type reaction turbine.
Although the sewage inlet works has screens(6mm 2 dimensions)and grit removal, I still have concerns...
