Our FCC power recovery expander vibration levels climbed 2 mils in 2 days. We suspect catalyst deposits on the blades. It is a 2 stage expander. We're currently down on feed and the expander isolated for spalling through thermal cycling. My question, is thermal cycling the only way of removing...
Thanks! The pumps Im currently dealing with is wash water on a desulphurisation unit. So far I've heard of 1 of our sister refineries in US having this issue and another in Holland as well. Our contacts in a refinery in UK went to a Warren Hydracell pump. They've had a test run so far and it...
I've got some data on Pitot tube pumps, just wondering because its more of a centrifuge thing, does it take long for it to respond? Anyone has experience with these pumps? This may not be a suitable question for this forum sorry.
Yea thatas what I thought about the leakage collection back to suction, unless they're expecting high pressure leakage from the packings, if not they'll flood the entire stuffing box. And yes it was recommended by the manufacturer.
Im trying to work out NPSHa at the moment, but the process side...
we're trying to steer away from barrier seal systems to be honest. We do not have automatic top up systems, we rely on the operator to drag the top up trolley to the system and use a hand pump. Im currently look at different pumps as well for the application. Seems like process plants/refineries...
Managed to speak to the manufacturer couple of days ago. Modification proposal to have larger pump, larger pistons to reduce pump speed. Valves will be changed to a semi slurry type valve, no details of that yet. Im not too sure of the proposal for packing, they suggested double packing with...
Its a triplex piston pump, pistons are 60mm diameter. Full speed is 273 rpm, but we normally run it at 170 rpm. Theres an inverter on the electric motor. They have poppet valves, suction and discharge. Suction pressure 3.6 kg/cm2, dishcarge pressure 70kg/cm2 rated, flow at 6 m3/h (170rpm). Its a...
Thanks flexibox. Like you mentioned will a dual seal fit into a PD pump? Im not very experienced with PD pump seals, more towards centrifugal and we have quite a few 53Bs on site. Recently we just resolved a 53B issue on a hot pump in excess of 300 C. It was a design flaw with the tab holders on...
Thats what I am contemplating. Our experience with high speed vertical pumps have been that its very restricted in flows. For good control of them a minimum flow controller is usually required, or just an orifice back to suction, that should control pretty well. When it deviates from its...
micalbrch:
Maybe cavitation, will be looking deeper into with the manufacturer. Most probably at this point need to consider a different pump type.
JJPellin:
Can't do multistage, think flowrate is too low for that. Had a chat with SunDyne and I believe they can work with such low rates, or...
Hi all,
We currently have a PD pump on our Hydrotreater pumping high concentration H2S (above 2000 ppm)water at 6 m3/h. It pumps from a suction of 3.7 kg/cm2 to 70 kg/cm2. Unfortunately we are only using single packing on this service, which I believe is specified wrongly during design. Any...
Hi all,
We currently have a PD pump on our Hydrotreater pumping high concentration H2S (above 2000 ppm)water at 6 m3/h. It pumps from a suction of 3.7 kg/cm2 to 70 kg/cm2. Unfortunately we are only using single packing on this service, which I believe is specified wrongly during design. Any...
