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Pipeline Surge

This document outlines a spreadsheet for calculating maximum surge pressure due to valve closure, incorporating valve type and closure time. It provides user input fields for engineer details, stream data, fluid properties, valve data, and pipeline data, with results indicating a surge pressure rise of 241 psi and a maximum surge pressure of 256 psig, which is within allowable limits. The methodology is based on the EXXON Piping Vibration Evaluation Guide and is intended for initial surge evaluation screening.

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Inam Khan
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62 views1 page

Pipeline Surge

This document outlines a spreadsheet for calculating maximum surge pressure due to valve closure, incorporating valve type and closure time. It provides user input fields for engineer details, stream data, fluid properties, valve data, and pipeline data, with results indicating a surge pressure rise of 241 psi and a maximum surge pressure of 256 psig, which is within allowable limits. The methodology is based on the EXXON Piping Vibration Evaluation Guide and is intended for initial surge evaluation screening.

Uploaded by

Inam Khan
Copyright
© © All Rights Reserved
We take content rights seriously. If you suspect this is your content, claim it here.
Available Formats
Download as XLS, PDF, TXT or read online on Scribd
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EXXONMOBIL PROPRIETARY

PIPELINE SURGE CALCULATION Alpha Version Rev 0.2


This spreadsheet computes the maximum surge pressure resulting from valve closure. The method takes account of valve type
and valve closure time. The method used is taken from The EXXON Piping Vibration Evaluation Guide, and is recommended.
for initial surge evaluation screening. Results are less conservative than those obtain from Joukowski Surge head
Enter data in blue cells only, and use "drop down" windows for option selections.

USER INPUT

Engineer Details:
Name / initials GH
Project / ref alpha version
Pipe reference number number 1
Calculation date: 7/7/2025
Preferred units US

Stream Data
Flow rate Q 5791 US gpm
Initial Pressure at valve inlet Ps 15 psig

Fluid Properties Typical Fluid Bulk Modulus :


Liquid s.g. 0.8251 Water 2.97E+05 psi
Fluid bulk modulus K 2.00E+05 psi Oil sae 10 2.47E+05 psi
Viscosity µ 0.1 cP Kerosene 2.03E+05 psi

Valve Data
Valve type Gate
Actual closure time Tc 60 seconds

Pipeline Data Typical pipe dimensions


Maximum allowable pres. P' 265 psig Enter Nominal diam 16
Flow path length L 2000 ft Based on SCH 20 pipe
Pipe id d 15.25 in <=== Pipe id = 15.38 in
Pipewall thickness t 0.375 in <=== Wall thickness = 0.312 in
Youngs Modulus E 2.90E+07 psi [Note : steel = 29 - 31 x 10^6 psi]
Poisson Ratio v 0.3 [Note : steel = 0.3]
Pipe roughness E 0.002 in [Note : See DP 14B for typical values]

RESULTS SUMMARY (EXXONMOBIL PROPRIETARY)

Surge pressure rise dP 241 psi


Maximum Surge Pressure Pmax 256 psig OK - Line MAWP not exceeded

[N.B. : Uncorrected Joukowski head rise is 444.3 psi ]


The surge pressure is based on the following dimensionless values, from the EXXON Piping Vibration Manual Fig VIII-7
Tc.a/L 118
g.Hf/(a.Vo) 0.026
g.dH/(a.Vo) 0.54 (note 1)

Note 1: For definitive work the User is advised to confirm the estimated value of g.dH/(a.Vo) is reasonable
versus the original report graph referenced above, based on the above dim'less values.

EXXONMOBIL PROPRIETARY

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