Dear Rao VT / or stress experts,
Can you provide this information on stress analysis,
1) For Spring hanger design first two load cases are run,ie dead weight and
operating ,How these load cases are created and what is the procedure to be
followed in carrying out these steps?Answer to this querry is appreciated.
Thanks and regards.Kumar
"Rao V.T." <raovt@npcc.co.ae> wrote: THE allowables on rotating equipment is
to avoid misalignment of pump and
driver......(so only dia )..
whare as the allowables on the vessels/columns is to avoid stress failure at nozzle/vessel junction......(so dia and rating....)
it is as simple as that
Regards
V.T.Rao
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> -----Original Message-----
> From: SARE, RALPH H. [SMTP:SARERH@YANPET.SABIC.com]
> Sent: Wednesday, May 08, 2002 3:52 PM
> To: 'PipingDesign@yahoogroups.com'
> Subject: RE: [PipingDesign] Allowables in Stress
>
> let us take the case of api 610 (why? because nema sm23 load allowable is
> very unreasonable - very low value. same with api 617 since its nothing
> more
> than "1.85xnema"). notice something. the rules are complicated. first its
> ok
> to exceed the table range by a factor of 2. it doesnt stop there. even if
> you satisfy the table values, the nozzle load must still pass the
> interaction formula for the values to pass. and here's the kicker - say
> you
> pass the first reqt (not exceeding the 2X the allowable rules) but failed
> on
> the 2nd req't (interaction are not ok), the pump may still be found ok
> provided you satisfy condition 1 and 2 (and that's another story).
>
> To use the ROT program of C2 requires the understanding of the above rules
> (confusing ain't?) else just look for the failed and pass remarks in the
> status column of the C2 report .
>
> that's just for starter. ok let's have a look at your posting. My
> undersatding what the api 610, 617 (same as nema practically) and 661 says
> is a bit different from what you have stated so i would comment on this
> later. lemme add 2 more commentary before closing.
> 1. observed the arrangement of the pump. notice the weakest link? if you
> do
> then it would help in the understanding of the use of pipe dia as the
> basis
> for the allowable load and moment. and this values has been a subject of
> much debate in the past.
> 2. the latest rev of the api 610 (not incoporated in 617 dissapointingly)
> is
> an improvement. now you can specify in your po whenever you buy a pump a
> heavy duty base plate say a triple strenght. the result is you get a
> higher
> allowable load ( 3x higher)at minimal added cost.
>
> man, the piping designer in this case is literraly under the mercy of the
> pump mfr. this forum may be use to influence the api 610 rules hopefully.
>
> -----Original Message-----
> From: animesh_singh@ril.com [mailto:animesh_singh@ril.com]
> Sent: 04 May, 2002 11:25 AM
> To: PipingDesign@yahoogroups.com
> Subject: [PipingDesign] Allowables in Stress
>
>
>
> Hello friends, thanks for sharing your views .
>
> My this query is related to Allowable Nozzle Loads in various equipments.
>
> For certain equipment's like Pump, Compressors, Turbine ,Aircooler, Heater
> the Allowable Nozzle loads and Moments are given against Nozzles Nominal
> Bore, where as for equipments like Vessels, Column, Heat Exchangers, Drum
> the Allowable Nozzle loads and Moments are given against Nozzles Nominal
> Bore and Flange Rating.
>
> Example: According to NEMA -SM23 quotes the allowable for nozzle
> (individual and combined ) equivalent diameter only example for turbine it
> is 3F+M<= 500Dr}
>
> Similarly API 610 quotes the Nozzles Loads for given Diameter only.
>
> My queries are
> 1) what are the criteria for calculating the nozzle allowables.
> 2) why only dia is considered as factor for comparing with force and
> moments in above mentioned equipments.
>
>
> Regards
>
> Animesh Singh .
>
>
>
>
>
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[Non-text portions of this message have been removed] Received on Thu May 09 14:55:00 2002
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