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I am looking at buying some knife gate valves for a slurry application. One of the two options available has a spindle made of stainless steel 304 and the other has a spindle made of chrome steel (303). What is chrome steel?

On the last two contracts we have actually switched to what we call a "Ranger" VJ coupling instead of the flanged VJ for the very reason you mentioned. For instance, a 300 NB Ranger coupling can join pipes with outside diameters that vary from 315mm to 332mm. The most common joint is...

I am the one that posed the original question. We are based in South Africa but we do all our work in Botswana where the practise is to put all valves in concrete chambers/pits. This applies to air release valves, scour/washout valves and in-line isolation valves. In fact, we have on several...

When putting a valve in a chamber, is it correct practise to put the thrust pipe before or after the valve?

Is there such a thing as galvanic attack? I am referring to the reaction between brass and threaded galvanised steel pipe.

Thanks for your reply. Is it then the "return" wave going upstream from the disturbance? Can the wave celerity be found on a table, if not, must it be calculated? Is it a factor of pipe size? Is it a factor of pressure?

In South Africa we use what we call a Viking Johnson End Cap. I'm not sure if you are familiar with the Viking Johnson Coupling, but all it is is a blanked off Viking Johnson coupling. You can contact Klamflex Pipe Coulpings on +2711-762-5326, speak to Steve Channing.

I'm not sure in which country you are, but in South Africa we have a sewage gas air relief valve manufactured by Vent-o-mat/IVM Hydro Projects. Contact them on +2711-918-4057, speak to Shaun.

When calculating water hammer, one input factor in the formula is "wave celerity". What is wave celerity?

Can anyone help me with drawings for the correct design of isloating valve, scour valve, air valve and water meter chambers? I am in south Africa please please state what standard you are using.

I supply steel pipes and fittings to civil contractors in the sewer and water reticulation field. I need to download a simple CAD program to assist me in drawing and designing pipes and pipe fittings. Can anyone recommend a good one?