Hi Balakrishnan,
Concentric reducer in pump suction is not always with top side flat. It is okay
in clean service.
In slurry service, bottom flat is used to avoid pockets for settlements.
regardsDKMRAOPh: +974 5626517
To: PipingDesign@yahoogroups.comFrom: MDETUSER@tatachemicals.comDate: Thu, 21 Feb 2008 08:30:13 +0530Subject: RE: [PipingDesign] Re: Pipe Fittings
Dear GeoffI am very impress the way you make some 1 understood regarding
reducer.Now it's my request to you to clear it a little more that, from both
theposition which one it practicable to keep the eccen reducer.Thanking you in
advance.-----Original Message-----From: PipingDesign@yahoogroups.com
[mailto:PipingDesign@yahoogroups.com]On Behalf Of blenrayaustSent: Thursday,
February 21, 2008 2:06 AMTo: PipingDesign@yahoogroups.comSubject: [PipingDesign]
Re: Pipe FittingsHello Balakrishnan,Welcome to our Forum. As engineers we need
to be precise with our responses and careful not to misdlead as there are many
newcomers to the field of piping engineering who read what is said."Air pockets
may form if concentric reducer is used at pump suction, which results in
Cavitation, and cause damage to Pump." Air pockets do not cause cavitation. Air
pockets may reduce hydraulic capacity. Cavitation is caused by the liquid
pressure being below the vapour pressure of the fluid. The NPSH may possibly be
compromised by the reduced hydraulic capacity resulting from air trapped in the
suction pipe. This in turn can result in the NPSHa being < NPSHr.Refer to
www.mcnallyinstitute.com for excellent papers on pumps from an experienced
engineer in the field.regardsGeoff Stone--- In PipingDesign@yahoogroups.com,
"mail2rambal" <mail2rambal@...> wrote:>> Hie Friends> > This is Balakrishnan, i
am a new member for this group and now i > working as a Material Engineer in Abu
Dhabi, UAE, i really happy to > join this group so please add me as a friend in
your list.> > And reg Mr. Mustafa clarification > Eccentric reducers for Pump
suction to avoid Cavitation, to maintain > elevation (BOP) in rack.> >
Concentric reducers for Pump discharge, vertical pipeline.> Air pockets may form
if concentric reducer is used at pump suction, > which results in Cavitation,
and cause damage to Pump. To avoid this > problem, Eccentric Reducer with> Flat
Side up (FSU) is used in Pump Suction> > i hope my knowledge of Concentric and
Eccentric reducers may be > useful for you> > Best Of regards> Balakrishnan R> >
--- In PipingDesign@yahoogroups.com, mustafa rayees > <mustafa_nlg@> wrote:> >>
> > > Dear Friends,> > > > Hi To everybody , This is mustafa ,Presently working>
> for chilled water piping design. I am having> > difference of opinion to use
concentric reducers.> > > > My argument is that we can use concentric reducers
in> > horizontal & vertical pipes While my colleague is> > saying not to use
concentric reducers in horizontal> > pipes.> > > > Please let me know any piping
design recommend for> > above> > > > I will be thankfull if you give me correct
information> > > > > > Thanks indeed.> > > > Mustafa> > > > Designing Eng.> > >
> > > > __________________________________________________________>
_______________> > Never miss a thing. Make Yahoo your home page. > >
http://www.yahoo.com/r/hs>
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[Non-text portions of this message have been removed] Received on Thu Feb 21 09:47:00 2008
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