Dear Mr Bhat,
You could also install expansion joints at the suction/discharge nozzles of the pump between the anchor and the nozzle.
E. Scheir
-----Oorspronkelijk bericht-----
Van: sudhindra bhat [mailto:sudhin_99@yahoo.com]
Verzonden: maandag 25 oktober 2004 16:09
Aan: PipingDesign@yahoogroups.com; <a href="/group/PipingDesign/post?postID=8vjcYtKXsoY0V00G6TV-UFh1aLSj2rmaptL9dJPo4s8d8e77DhmwNnTI3LKgP_qwnHOZbkONf58AIb7pdaOyuMDSztI">tspldesign@thermalindia.com</a>
Onderwerp: RE: [PipingDesign] Clarification regarding API 610 Analysis
Dear Mr Subba Rao
Pump will be having a fixed foundation i.e. anchor. For stress analysis we have to consider pump suction/discharge nozzle as a anchor with initial displacements. As the pipe temperature changes from the installation condition, it either contracts or expands , By providing another anchor near to pump suction/discharge flange , pipe will have the potential of generating enormous force & stress in the system so reaction load will over load the connected equipment & may induce vibration in the system.
A rail road construction analogy can be used to illustrate the principles of piping flexibility. Assume a case where rail ends nicely fitting together without any gap. With this kind of neat construction the rail expands, creating very high axial force when weather gets hot. This force can push out of alignment making them hazardous for the trains to pass over.
General practice is to give first support to any rotating equipment as spring hanger & The equipment nozzle loads (anchor) are released in installation condition by adjusting the spring hanger. Regards,
S P Bhat
Sajit Viswan <sviswan@tebodin.co.om> wrote: Rao,
Anchoring near the pump nozzles will leave a short length of pipe between the pump and the anchor. This effectively becomes 2 anchors (the pump being the other) on a straight length. This will theoritically create a very large end reaction on to the pump nozzle. Though it may be preventing the transfer of moments and forces from the other side of the piping.
I had a similar problem, an explanation that I got was that this expansion will be taken by the compression of the gasket. The gasket is already compressed to have the sealing, any more compression may fail the gasket in compression, I think. In the end I did not have those anchors.
This problem will be more significant if the temperatures are elevated as in your case of WHR.
Sajit
-----Original Message-----
From: Thermal Systems Design [mailto:tspldesign@thermalindia.com]
Sent: Saturday, October 23, 2004 2:47 PM
To: <a href="/group/PipingDesign/post?postID=HSoeNnO2puqM0hs2ORKWVYp9BxwZFWlwR5WBEcJ0B20IhSXzq14nddlvrEHCGQTOvNbNWP_kn4wuVpquUWdR6KlyCWo">pipingdesign@yahoogroups.com</a>
Subject: [PipingDesign] Clarification regarding API 610 Analysis
From : K.V.Subba Rao <tspldesign@thermalindia.com>
To : <a href="/group/PipingDesign/post?postID=aKnqVFEigayXVZ5CytYBq6-yr02JZ8VrpwzKGDU0Y5AQislkx26bLE9YiS9GXjonGFzQQXDFSA6lEW91cmcel3VLxAw">PipingDesign@yahoogroups.com</a>
Sub : Clarification regarding API 610 Analysis (CAESAR)
Sent : Sat, 23rd Oct '04
Dear Sir,
We are engaged in Design, Manufacture, Erection and Commissioning of WHR Systems.
We are having certain doubts about API 610 Analysis.
We are anchoring at pump suction flange Anchor was provided and ensure that
no forces
and moments are transferred to pump suction flange.
And no API 610 Analysis required because we are anchoring near the flange. A anchoring support will be provided.
To understand we are enclosing here with Input file for the same. Can you comment we are correct or not.
Your early reply will be highly appreciated.
With Best Regards,
For Thermal Systems (Hyd) Pvt. Ltd.
K.V.Subba Rao
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