RE: Natural Gas piping design [adr][adr]

From: <Bruce>
Date: Fri May 02 2003 - 10:55:00 EDT

Sudhir:

Welcome to the group. You have a lot of questions that just require us to ask a lot more questions of you. I suggest a that you review guidelines or texts that discuss flow of gases, such as the appropriate sections of Perry's Handbook and "Flow of Fluids through Valves, Fittings, and Pipes" by Crane (Technical paper 410). Neither of these will take more than a day or two to review, assuming you have had the background training on the general concepts. Then you can spend a few more days identifying your very specific needs and asking again. Note that your questions 1.2, 1.3, 3, 6, depend on what material of piping you are using. For instance, if you are using flexible, smoothwall plasitc pipe the answers are significantly different than if you are using black iron. NG viscosities are presented in Perry's (note that gas quality impacts the listed numbers).

                ... Bruce D. Bullough ...
                Sebesta Blomberg & Associates
                2381 Rosegate
                Roseville, MN  55113    USA
                651-634-7344 direct
                651-634-7400 FAX
                www.sebesta.com

-----Original Message-----
From: sudir [mailto:smahajan@bses.co.in] Sent: Friday, May 02, 2003 9:02 AM
To: PipingDesign yahoo group
Subject: [PipingDesign] Natural Gas piping design [adr][adr] Importance: Low

Hi friends,
I am a new member in this group.
I request everybody to accept me as a member of this group. I am having some probs.

1. How to calculate the following things for given volumetric flow of gas:
   1. Pipe dia.
   2. Pipe thickness/ pipe schedule no.
   3. Pressure drop/kilometer of pipe length.
2. For most economical transmission of gas through pipe at what pressure the gas is to be transmitted? On what factors it depends, please elucidate.
3. What is the maximum gas velocity allowed in the pipe?
4. What are limiting factors for deciding the above things?
5. How to calculate the compressor power required for boosting the pressure of the gas?
6. Due to flow of gas through pipe there may be increase in temperature of the gas; how to calculate the temperature rise due to friction?

Does it have any safety related aspects? If yes then how to counteract this?

7. What is the value of the natural gas viscosity? 8. I have tried two formulas

1. Waymouth &
2. Fanning's formula Even though both are applicable for the gas flow through pipe but the pressure drop calculated by these formulas gives different values. Please clarify.

For e.g. Volume flow = 40 mmscmd

   Inlet pressure = 10 bar
   Inlet temperature = 30 oC
   Pipe length = 500 km

Your answers are highly appreciated

Regards
Sudhir

[Non-text portions of this message have been removed]

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http://docs.yahoo.com/info/terms/ Received on Fri May 02 10:55:00 2003