RE: Internals

From: <Steve>
Date: Mon Nov 10 2003 - 01:36:00 EST

Hi LAKSHMI NARAYANA V

I have experienced similar problems, both hot and cold. In my opinion the best solution, where possible, is to extend the spindle and move the actuator away from the source of heat.

Cheers

Steve McKenzie

-----Original Message-----
From: Lakshmi V. Narayana [mailto:LNarayana@safco.net] Sent: Monday, November 10, 2003 6:35 PM
To: 'PipingDesign@yahoogroups.com' Subject: [PipingDesign] Internals

          Pneumatic driven check valve(control valve) for process air to reformer, soft internals of actuator are getting damaged (become brittle) and being replaced in every shutdown.

         The internals like bushing guide,(made of Teflon),Rod wiper ,seal ring case for case(Rubber),wear strip(teflon),U-cup,seal ring piston (Rubber) are getting damaged due to high temperature .

         The temperature of process air is 520 C. this may be due to heat conduction through spindle to actuator.

       TEFLON can take 250 C max. TEFLON can be replaced with TEFZEL. If any body has faced such kind of experience please send suggestions.

LAKSHMI NARAYANA V
MECHANICAL ENGINEER
SAUDI ARABIAN FERTILIZER CO.

---

Discussion List sponsor: The fluid flow calculations website - www.LMNOeng.com - LMNO Engineering, Research, and Software, Ltd.

---

Information presented on this list is given as helpful advice, nonsense, carefully-considered calulation or any combination of the above. The intent is to spark discussion and encourage knowledge-sharing amongst professionals. If you blow yourself up by doing stuff remotely described by info gleaned from reading this list, you are an idiot.

Your use of Yahoo! Groups is subject to <a href="http://docs.yahoo.com/info/terms/">http://docs.yahoo.com/info/terms/</a> Received on Mon Nov 10 01:36:00 2003