RE: Instrument tappings

The thermowell should not be placed close to reducers etc, which may introduce vibration to the thermowell. Preferably, it should be placed at 1.5 Dia and more distance from reducer locations.

regards

chakra
-----Original Message-----
From: <a href="/group/PipingDesign/post?postID=haVYRwohkilqfZzI8FfAkv4mZbfX2YhU0hydoyl6opGWrkdvv2fDkgr2F53npLW4NKJjlmoSVh0UYwfELH-Fvn_u">PipingDesign@yahoogroups.com</a> [mailto:<a href="/group/PipingDesign/post?postID=haVYRwohkilqfZzI8FfAkv4mZbfX2YhU0hydoyl6opGWrkdvv2fDkgr2F53npLW4NKJjlmoSVh0UYwfELH-Fvn_u">PipingDesign@yahoogroups.com</a>] Sent: Thursday, November 08, 2007 10:44 AM To: <a href="/group/PipingDesign/post?postID=haVYRwohkilqfZzI8FfAkv4mZbfX2YhU0hydoyl6opGWrkdvv2fDkgr2F53npLW4NKJjlmoSVh0UYwfELH-Fvn_u">PipingDesign@yahoogroups.com</a> Subject: Re: [PipingDesign] Instrument tappings

Pressure tappings are not placed inclined, however thermowells with laterolet fittings are placed inclined to the length of the pipe. By placing at an incline, it has the advantage of accommodating the length of the thermowell in a smaller ID of the pipe than it would be, if placed otherwise. The thermowell is unlikely to create any turbulence in the flow. However the flow might induce a vibration on to the thermowell with a resultant fatigue failure of the thermowell. Thermowells are therefore installed with the inclination placed against the flow, which would give the minimum of the possible flow induced vibration on the thermowell.

Sajit Viswan

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[Non-text portions of this message have been removed] Received on Thu Nov 08 00:37:00 2007