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Thanks for the reply. Will NPSH be a problem for me because I have a plunger pump that will be fed pressurised water from a centrifugal pump in the basement (I am using the plunger pump to boost the water pressure). My plunger pump recommends an inlet pressure of 1.4barg (max 4barg). I will...

Dear All, Happy New Year. I am installing a small plunger pump (CAT 230 with variable speed drive) to pump water at low flowrates into a pressurised steam line in our R&D test facilities. Reading the installation manual it states that the inlet line size must be a minimum of one size larger...

The minimum flow rate of the pump is 43kg/h. We want to achieve 10kg/h. The pump has a built in safety valve, also the pump outlet feeds water to a heat exchanger which has another safety valve on the hot water out incase of plate rupture. Thanks Andrew

bypass line it is then, my colleague will be happy he's right. It's only an R&D lash-up so we will control the bypass line by hand. Thanks Andrew

Thanks for the reply Latexman I think the water pressure will be controlled by the pump, so I will only require flow control. The water is being injected into a steam line (at pressure). The positive displacement will just pump against the resistance from the steam line. So I was led to believe...

Hi Folks, In our R&D test facilities we require water at very low flowrates (10 - 300 kg/h) and high pressure (50barg) for a series of experiments. We plan to use a CAT piston pump with VSD. However we still cannot achieve the lowest flowates (10kg/h). Therefore to achieve the lowest flows I...

Thanks for the swift reply BigInch. Yes are flowrates are very low. The tank is open topped. I think I'll have to branch into an existing line that returns to the tank. (otherwise make a hole in the floor).

Hi Folks, As part of our test set-up we require very low water flowrates at reasonably high pressures. The spec is water from 5 to 200 litres/hr at pressures up to 50barg. I've looked at 100's of pumps in order to achieve this and have settled for a piston pump with variable speed drive...

thanks for the advice everyone, The max steam pressure available for the heat exchanger is 40barg anyway, so your right even if a plate does rupture the heat exchanger will be safe. My only concern is that we planned to have ANSI 300 iso valves and check valves downstream of the heat...

Greetings, I'm designing a test rig for our R&D test facilities. Part of the rig requires water at 40barg close to saturation point. Therefore we have a PD pump raising mains water to 50barg going through a heat exchanger (rated to 60barg) which uses steam as the heating medium. Max flowrate...

ValveDude, My pressure will be around 3 to 5 bar gauge. Like you say there are billions of valves out there, but I haven't had much luck finding a rotary shoe valve. I'm especially looking for a valve which requires a low actuation force. It looks like I might have to design one.

Thanks for the info ValveGod. I actually work for Spirax Sarco and we don't make them. I don't think rotary shoe valves exist for steam. It might be due to the fact that you won't get a tight shut off. Andy

Good Day to everyone, After hours trawling the net this is my last hope. Basically I'm looking for a rotating shoe valve that can be used on steam. I want to divert a steam supply between 2 lines, therefore I'll need a 3 port diverting valve. To make things even more complicated I would like...

thanks all, My question's been answered.

athomas236, thanks for your reply. The flowmeters are calibrated on water, the data then has to be corrected for steam. As the flowmeters in question are variable area, compressibilty is an important issue.

Hello, My company are thinking of purchasing AGA Report No. 8 with the hope that it contains equations to find the density of any gas. Part of our business is the design of flowmeters (that are mainly used on steam). I know the AGA report is concerned with natural gas, but I would like to know...