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There is a possibility that during the bypass mode the circulating fluid is much hotter. Is that another possibility that you have not look into ?

Another idea, before you might want to the try the above, is to ensure that the strainer is properly vented. I can't see the suction side of the pipe, if there is a loop or not. I presume the suction pipe of the pump is properly vented. You can put the strainer on the suction side as suggest...

Thanks bradshsi I don't have bearing size, I am just trying to specify if oil ring is required over oil bath. Since speed is a factor. And as a rule of tumb rpm over 3600. How about power (kW) or shaft power which translate into bearing size ? What do you think, a typical power rating of a...

Thanks electricpete for the infomation. Would you say rule of tumb any thing in exceed 3600rpm we would go for oil lubricated ring. Is there a way to calculate this out or is it base on experience ? Thanks again

Hi Just would like to know what would be the reason to go for oil ring lubricated bearing against oil bath lubricated. Thanks

Have you consider progressive cavity pump ? It would be worth looking at this, this type of pump is design to pump 30-40% solids and it is for slurry application. Anyway I do not know how sharp and large are the solid, if it will cut through the stator.

Yes ccfowler you are right, thanks for the information on gerotor and cresent pumps. I am sure some of us have not given much thought about gear pumps. I believe the general reason for that, it is cheap , small and insignificant. Thanks ccfowler, I have learn a new word today, "Gerotor is a...

Hi, Can someone tell me the advantage between an internal and external gear pump. I am using it to pump diesel for one tank to the other. What would be the selection criteria between a internal gear and external gear pump ? Cost ? Maintenence ? Thanks

Hello Can someone advice a painting spec. for an exhaust stack ? Area of concern would be at the top end where the exhaust comes out. Thank 1ton

Hello Does any body have an old BS3351 :1971 Specification for piping systems for petroleum refineries and petrochemical plants. Just intrested in reading old withdrawn std. Thank you 1ton

I would like to know, if it is ever possible (in this new technology) for a firesafe valve to have soft seat. If yes pls let me know, if not pls let mw know also. Thanks 1ton

Thanks Unclesyd. Does anybody know any other manufacturer base in Europe. Thanks

Hi I would like to know if there is any manufacturer that has fabricated for a jacket pipe 24" diameter and total length of 150 m. We would like the jacketed piped to be coiled at a diameter of 12 m. Thanks 1ton

I was recently made aware for high pressure screw pump. The design pressure of the inlet and outlet side is different. Example if the design of the discharge side is 80bar, then maybe be the suction side is design at 40bar. Is this a common practice, for screw pump manufacturer. API std doesn't...

Viscous Crude Oil

Does anyone knows when do we choose double over single seal. Advantage over the other. Any intresting artical on this subject. Thanks 1ton

ProjEng, A safe suggestion, to ensure that you do not blow out the nozzles, due to over pressure is to install orifice plates in the system. I think this will be much cheaper and safer. Butterfly valve should be design for trottling. I hope that is spec in when you buy the valve. Because if it...

KKanel, I have some basic curve, for dew point (ABB)now Alstom. I have to check and scan it, need some time. I believe it is for basic engineering and not detail one. your e-mail address pls. 1ton

Hi Can some pls enlighten me on this particular subject. Looking at ISO 9906 1999 and some previous BS for pump performance test. It is mentioned in the std, that there is a "type number K of pump"." When K > 1.2 it is recommended to simulate the site conditions"(pg 12 par...

Hi! Does anybody know the formula to calculate frictional loss in pipe systems for Sludge(10-20%)or grease. Any reference material for system analysis, or design would be appreciated. Thanks