6 replies to this topic

[Ranga v]

Naphta tranfer line appox  ~ 100 km, 6"  currently pumped at the rate 100 m3/hr needs to increased to 160 m3/hr. How do i check the surge pressure for the increased flow.Naphta density is 670 kg/m3, line pressure 40 kg/cm2g.

[latexman]

I'm not sure what you mean.  Can you be more descriptive, please.  Surge pressure would be if a valve closes too fast, but you give no valve closing time.  Do you mean the increase in pressure drop due to the increased flow?

[Ranga v]

Increase in the pressure.Considering quick valve closure time duration 5 sec.

[Bobby Strain]

You will need a new study with the appropriate software.

 

Bobby

[shvet1]

How do i check the surge pressure for the increased flow.

 

Rule of thumb see McAllister's Pipeline Rules of Thumb Handbook para. "How to determine the maximum surge pressure in liquid-filled pipeline when a main valve is closed suddenly" (page 386 in my copy).
Companies practices see:

- Japan Gasoline's standard #210-120-1-74E
- Shell's practice #31.38.01.11 para. 2.3.4 

- SIGTTO's Guidelines for the Alleviation of Excessive Surge Pressures on ESD for Liquefied Gas Transfer Systems

Calculator see:

- Cheresources.com/Downloads/ChE Plus Subscription Files/Premium Excel Spreadsheets/Water Hammer Pressure Development

- https://www.lmnoeng....aterHammer.php 

Simulators see dedicated software e.g. Pipenet, Pipephase.

Theory see Streeter&Wylie's Fluid Transients.

For a brief view see:

- KSB's Lexicon chap. "Hydraulic surge"

- file attached

 

... and references in those. A simulator from a reputable vendor is preferred.

 

Note that pressure surge depends on speed of sound which depends not only on liquid properties but what material a pipe is made of and even pipe isometric and supports

Attached Files

•  Liquid_Pipelines_Surge.pdf   89.69KB   44 downloads

Edited by shvet1, 16 December 2022 - 02:35 AM.

[breizh]

Hi,

take a look:

 https://www.cheresou...pipeline-surge/

 

Breizh

[Bobby Strain]

Ranga,

       This is serious business. So you should find an engineer or company who can reliably perform an analysis with accepted procedures. Have a look at this.

       https://www.betamach...hammer-analysis

 

Bobby

Edited by Bobby Strain, 14 December 2022 - 12:31 PM.