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True tandem = "face to back" seal configuration though?

Thanks for the thoughts, it's all useful information for me.

Thanks Flexibox, you're right, ofcourse.

Look also for Nitrogen seal gas purity issues if the process gas contains H2S and you're using N2 seal/seperation/buffer gas. There have been failures from black powder formation in the seals due to impure N2 being used. HTH.

Thank you both, that's helpful. They're mostly plan 53B and plan 75 systems from Eagle Burgmann.

I have taken over a job that is over half way through and the company has ordered a raft of API610 centrifugal pumps of various sizes for an upgrade project from one vendor. As an additional requirement to API610, the company has asked for the seal chamber pressure to be meaured and recorded on...

Thanks, that's helpful, I'll have a look at those myself too. I'd forgotten about McNally, his papers are very good as I recall.

Thanks BigInch, good enough for me too then!

Thanks all, that's interesting. I think my answer to the young guy wasn't far off. Let me expand slightly, the duty in question is a storm water sump that will normally be emptied by one pump on an on/off level control. There is a single 100% standby pump. We all know that operators may...

Thanks that's very helpful.

Hello all, recently, when I was asked a question by a young process engineer, I struggled to answer it concisely. The question is- When selecting 2 x 100% pumps for a given duty, if they may sometimes be run in parallel, we select a pump curve where the single pump case is close to BEP but...

Hi all, I have recently been reading a dynamic simulation report on a centifugal compressor set that refers to a couple of terms that I'm not familiar with- a) "Settle out pressure". b) "S curve". Could someone please explain to me what these terms mean? Thank you.

Cavitation.

I suspect that you are at risk of pulling the pump apart from the brief details given here. As I posted above, I've seen it happen on a Cast Iron pump that was piped up with Carbon Steel piping that cracked the pump casing when it cooled down one winters night. If I recall correctly, the night...

I have had a cast iron pump pulled apart as the piping cooled (and contracted) after the pump stopped. It was warmer than -30 Celsius too.

I use both types perfectly satisfactorily. I'd be very tempted to just buy a pump/motor set as the spare and change them out as a complete unit I think.

Thanks TPB. No, I haven't tried those but I will take a look next time I need such a device, thank you.

Sounds to me like you need to grout the new adapter plate as well as bolting it down. Looking at something in the "Chockfast" range of grouts would be my recommendation. HTH.

A side issue, but not all types of steam traps pass incondensibles well at all. I have seen applications where I have had to install air vents in addition to the (float type) steam traps.

I think the point is, there are threaded connections and then there's threaded connections. They're not all born equal. The take off from the top of the condensate line will be to ensure that incondensibles are removed from the system. A side or bottom take off will allow incondensibles to...