I have worked with many fuel terminals in the past. Most all not attached to a refinery have used ANSI pumps. One that did use API pumps that comes to mind was built when a company was flush with cash but they could not afford to overhaul the pumps 15 years later. Even a stainless steel pump...
Are the flow rates the exactly the same? The NPSHA maybe very close to each other but the NPSHR maybe greater for the propane service depending on where or how fast you are discharging it. Cavitation sounds may get worse in the winter because the delta T may be greater if so then the energy...
You are right I normally count on the piping designer and stress engineer to get the piping close. I also fix ANSI pump problems created when engineers and owners try to save some money. There is no good reason to plan on loading an ANSI pump flange. I should have said that I redesigned piping...
JohnSr When I suggested an expansion joint may take up the load I was not suggesting you go to expansion joints are us to get one or order one from fly by night industries. Go to a company like Hyspan, they will ask for all the pertinent information and may even do the calculations for you if...
John Goulds does have that information available. You need to contact the Goulds rep in your area or ask Goulds online. A good expansion joint with limiting rods may take up the load and keep the pump components in line and running smooth.
Alanator; The pressure drop you might see would depend on how flat of a curve the centrifugal pump and the capacity of both pumps. If the feed pump curve is flat and the capacity of the feed pump exceeds the reciprocating pumps capacity the pressure may not fluctuate much. The glycerin filled...
A VFD on a centrifugal pump for boiler feed water may not be a good investment unless the boiler is sometimes operated at a lower pressure. Some systems run at high pressure in the winter and low pressure in the summer on these systems a VFD can pay for itself. With most boiler feed systems the...
Using eccentric reducers on the horizontal run of suction piping is technical and very important in most all pump installations. How can you calculate line loses in the suction pipe if the liquid is forced through only part of the pipe because the rest of the pipe is occupied by a large air...
mrelet You may have the siphon effect working against you. If you notice that the pad is released after the discharge line drains it may be the problem.
I would agree with Zapster. But many things would influence the outcome. Suction pressure, the fluids specific heat and other characteristics, the pumps efficiency, the pumps clearances and so on. If the pump has a high specific suction speed you would most likely develop incipient clouds of...
RJB32482 The back pressure valve on this type of pump is normally to help the checks make a positive seat in viscous liquids. It will most likely work wherever you put it in the line. I like to put the back pressure valve right after the surge suppressor and I like the surge suppressor right...
I would agree with Artisi especially on the efficiency. A small change in efficiency can add up to big dollars on large pumps that run often. I would also like to add that it could lower the cost for the supplier to manufacture the pumps substantially. With the double volute you have lower shaft...
I agree with JJPellin. A couple things you might want to look at to extend your seal life. On the API 11 if the fluid is clean and the pump and seal design allow, use a close clearance throttle bushing made of VESPEL or PEEK to control the flush rate rather than the orifice. You will take the...
Erik: The water temperature is key to evaluating your application. Vapor bubbles can form or be released in areas of low pressure even turbulence in the piping may have a low pressure area that can help form vapor bubbles. That is why it is so important to have the piping arranged so it is self...
electricpete: Gear backlash can cause this type of wear on your pump. It can come from continuously stopping and starting your pump or from sudden pressure changes from valves opening and closing. But on your application you might want to check to be sure you are not operating to close to the...
Yes when I am saying pressure I am talking about discharge head. Remember that when you are calculating horse power you need to use total dynamic head. Also when I spoke of slippage I forgot to mension that discharge pressure is also a major factor.
Regards checman
Just some basics on gear pumps. Normally only used on lubricating fluids. Special materials, designs and de-rating can overcome this restriction for some models. Most are positive displacement or PD pumps. Rotary positive displacement pumps displace a certain amount of fluid per revolution. RPM...
