RE: Piping Queries - II

From: <Ahmed>
Date: Thu May 02 2002 - 00:37:00 EDT

Rakesh Patil Wrote
"3. How to decide the thickness and type of insulation as well as insulating
material based on service and the temp of line?"

The optimum thickness of insulation is based on heat loss/gain economics. Based on calculation using the temp difference between the pipe/tank content and environment, the difference in temperature etc, one is able to determine the optimum thickness of insulation.
Different type of insulation is used for hot and cold services. The cold service being concerned with moisture ingress into the insulation material, causing corrosion and other problems.

"1. Why do we provide GLOBE Valve in by-pass lines? Why don't Gate Valve?"
Bypass lines relieve the pressure across the valve. I suspect that its absence in globe valve applications may be because globe valves open against the back pressure, therefore requiring greater force while a gate valve will slide unaffected by the pressure difference across the valve. I await the real piping fundis to answer this one satisfactorily.

Ahmed Vawda
Process Engineer
Al Khaleej Sugar - Dubai

-----Original Message-----
From: RAKESH PATIL [mailto:rpa@epc.ltindia.com] Sent: Wednesday, May 01, 2002 11:21 AM
To: PipingDesign@yahoogroups.com
Subject: [PipingDesign] Piping Queries - II

• High Priority **

Hi All,

Following are the things which i want to know from you -

1. Why do we provide GLOBE Valve in By-Pass lines? Why don't Gate Valve?
2. Why do we provide Rod on the sleeper/rack for simple resting support?
3. How to decide the thickness and type of insulation as well as insulating material based on service and the temp of line?
4. I want to know about the Acid Proof Tiling which is required in Acid related areas. Can you please throw some light on it?

Waiting for your replies.

regards,
rakesh

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Your use of Yahoo! Groups is subject to http://docs.yahoo.com/info/terms/ Received on Thu May 02 00:37:00 2002