on pump-related subjects. We rarely pass up an opportunity to highlight some of his experience-based comments.
at the top. Available texts often give no indication as to whether the pumpage came from above or below the pump.
Still, in many older texts it has been assumed that the pumpage source originated at a level below the pump suction nozzle.
taper reducer should not be used in a horizontal suction line as an air pocket is formed in the top of the reducer and the pipe.
higher than anticipated. Higher friction losses would occur and pump performance would be adversely affected.
clarify what reliability-focused users need to implement.
com/Article/2663961/Eccentri.28. etc. Igor J. viscosity. the line size upstream of any low point must be governed by an important criterion.). however. Find the 2nd edition under ISBN 0-88173-517-5. Straight pipe lengths are.blogspot. Inc. HP LITERATURE CITED 1 Karassik. he advises process plants worldwide on reliability improvement and maintenance cost reduction opportunities. Centrifugal Pump Clinic. one usually gets away with five diameters of straight length next to the reducer. For more detail about pump piping at http://piping-info. Page 2 of 4 Fig.2014 Some of the EPCs using a standard where they use ecentric reducer at Pump suction with flat side always at the top.. it might be wise to install as many as 10 diameters of straight length next to the reducer inlet flange.ca/2011/02/pump-piping-layout-design-guidelines.. Thanks for bringing this clarity !! susheel 05. The author Heinz P. His coauthored Bloch/Budris text. Suggested modifications for eccentric reducer mountings. Antony 01.hydrocarbonprocessing. In a proper installation. Pump User's Handbook. The line must be a diameter that will limit the pumpage velocity to values below those where bubbles will rise through the liquid. the reducer flange will thus be located at the pump suction nozzle and there is usually no straight piping between reducer outlet and pump nozzle. connected to the eccentric reducer inlet flange. 1989... Bloch is HP's Equipment/Reliability Editor. Great article .2014 Eccentric are placed flat side down in line .19. The two different rules-ofthumb explain seeming inconsistencies in the literature.. Very valuable reference to ask them to be flexible with their standard if the pumpage is from above the pump. In the case of certain unspecified velocities and other interacting variables (e. In general.. He can be contacted at HB@HydrocarbonProcessing. 2nd Ed. pump style.2014 why use eccentric reducer in pump suction line Manish Joshi 05. it can be stated that wherever a low point exists in a suction line..g.Eccentric reducers and straight runs of pipe at pump suction | H. NPSH margin. 2. Also. whenever vapors must be vented against the flow direction. 2/6/2015 .html ali 06. is comprehensive and very widely used.2015 This article is really nice and it clears some myth. I have argued this point with engineers who INSIST that a reducer shall be placed flat side up.12. Marcel Dekker.. http://www.06. the horizontal piping run at that point should be kept as short as possible.. The author of 17 textbooks and over 470 papers or articles. where both the 5 and 10-D rules can be found. regardless of the source of the pumpage.com.. On most pumps.
gravity) are more suitable for eccentric reducer? Mr...11.14.2012 Thanx for your info. 01.com/Article/2663961/Eccentri. varun 06.spe.c om Consider this article BOOKMARKED! 03. I want solution. Abid Bhatti 11. www..2011 Why should provide the eccentric reducer in the pump suction and why not provide concentric reducer????.2014 Can we use eccentric reducer instead of concentric reducer if we do what will be the effect...2013 Thanks for very help full article.Kindly elaborate the same akshay 01.25..08.2014 I know I'll be pulling it out for reference.10.2011 As to why the eccentric reducer should be mounted with flat bottom at bottom for pumpage Source above pump suction is still very unclear to me.. Regards Shankar 12.13.ir CHARLES 02..05..28..06.2014 Pradip Sinha 01. what benefits of eccentric reducer with 1".2012 tanks for this paper..2013 Dear....max.Eccentric reducers and straight runs of pipe at pump suction | H.2013 As to why the eccentric reducer should be mounted with flat bottom at bottom for pumpage Source above pump suction is still very unclear to me. Rgds Anirban http://www.08. Abdul 03.. Coz one of the fitter had used eccentric instead of concentric in PSV connection.2014 we have 8 nos high pressure pump (capacity 156m3/hr.if any special purpose of providing the eccentric????. every month one of them pump shaft is being damaged.hydrocarbonprocessing...2012 is there any possibility that concentric reducers be used on horizontal line piping? mojtaba javan 06.2" pipe at suction of C F pump? also which type of material service & parameter required in pump (Viscocity. 2/6/2015 ..2013 thanks a lot ... Mohamed metawa 08. Upper side Big Dia Lower side Small Dia Please suggest i want to know that the use of concentric and eccentric reducer.09.Piper007 08.. 02.pressure 15kg/cm2) with a single suction header. Now i know. is there any disadvantage?.mojtabajavan. pls give suggestion.30.25..Kindly elaborate the same . Page 3 of 4 pipingdesigners. So.