Re: Digest Number 841

From: <Mr>
Date: Thu May 01 2003 - 10:03:00 EDT

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There are 3 messages in this issue.

Topics in this digest:

1. Re: Digest Number 839 From: "alwyn KAYE"
2. FRP vibration From: jianto@ikpt.com
3. Re: FRP vibration From: Geoff Stone DD&D Australia

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Message: 1
Date: Tue, 29 Apr 2003 10:40:19 -0600
From: "alwyn KAYE"
Subject: Re: Digest Number 839

mr Das
1. the sifs are much hiher at right angles and the lateral momentum force is higher at right angles. Also the flow turbuluence at high velocities would be huge turning a 90 deg corner.

2. Analysis should always be as a complete system (s). Otherwise how are the correct disps , restraints and reactions going to be transferred between components.?
Regards: Alwyn (Al) Kaye

ALTECH ENGINEERING RESEARCH Inc.

9309-96 Str Edmonton, Alberta, T6C-3Y6

780.465.9762

Cell: 780.983.7347
Fax/Ans: 780.465.9762

altecheng@primus.ca
----- Original Message -----
From: Mr dipesh das
To: PipingDesign@yahoogroups.com
Sent: Tuesday, April 29, 2003 1:58 AM
Subject: Re: [PipingDesign] Digest Number 839

1. What are the basic reasons for PSV outlet lines are connected to the flare header at 45 deg(in the flow direction. 2. During stress analysis which one is preferable :- to consider the branch lines along with the main flare header analysis ( the flare line --header is subjected to undergo seismic analysis as per bid requirement) or to consider the flare header a unique package and the connected lines in individual stress systems. The displacements of the connected nodes of the flare system to be included in connected lines or To analyse the systems seperately and use the include file option for achieving the combined effect of the branches on header vis a vis. Dipesh Das

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Message: 2
Date: Wed, 30 Apr 2003 11:50:37 +0700
From: jianto@ikpt.com
Subject: FRP vibration

dear all,

I have a FRP problem.
we use multistage pump to generate high pressure. The pressure is 2500 psig.
how to void vibration on pipe?
do we use expansion joint to void vibration? we don't have experiance about calculation of FRP flexible analysis.

regards,

Sujianto

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Message: 3
Date: Tue, 29 Apr 2003 22:43:47 -0700 (PDT) From: Geoff Stone DD&D Australia
Subject: Re: FRP vibration

Hi Sujianto,

Vibration can be reduced by use of pulsation dampeners on the suction and discharge. Hydril have software that you can download to determine the size required or your local Hydril distributor can do it for you.

FRP has some concerns when it comes to vibration as it is a composite material. Delamination of the gel coat, separation of fibres from the resin substrate etc.

Algor's Pipepak allows the modelling of FRP and vibration analysis as I sure Caesar, Pipenet, Triflex and Autopipe do.

Expansion joints are not the way to go at such pressures although reinforced hoses may give some relief. You have to work out where the vibration is coming from to determine how you cure it. Is it a fluid structure interaction or a mechanical vibration from the reciprocating machine parts?

Geoff Stone
--- jianto@ikpt.com wrote:

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dear all,

I have a FRP problem.
we use multistage pump to generate high pressure. The pressure is 2500 psig.
how to void vibration on pipe?
do we use expansion joint to void vibration? we don't have experiance about calculation of FRP flexible analysis.

regards,

Sujianto

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Design Detail and Development (a division of Blenray Pty Ltd) We specialise in pipe network and waterhammer analysis, pipe stress analysis, the design of buried pipelines and thermoplastic pipe systems.

Overseas tel 61 2 402 35 2313 fax 61 2 8850 2313 mobile 0402 35 2313 Mail Address PO Box 1351 Castle Hill NSW 1765 Australia

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[Non-text portions of this message have been removed] Received on Thu May 01 10:03:00 2003