Introduction
The Mueller High Pressure is a general flow equation that is used in distribution systems with pressures greater than 1 psig. The Mueller equation exhibits errors (13-18%) with higher flow rates. However, for smaller diameter pipe and lower flow rates, it is more accurate. : Q=C_Q\frac{D^{2.725}}{G^{0.425}}\bigg(\frac{P_1^2-P_2^2}{L}\bigg)^{0.575}
Q=C_Q\frac{D^{2.725}}{G^{0.425}}\bigg(\frac{P_1^2-P_2^2}{L}\bigg)^{0.575}
π β Flow Rate (FT3/day)
πΆπ β 2826
π· β Internal Pipe Diameter (in)
π1 β Upstream Pressure (psig)
π2 β Downstream Pressure (psig)
πΊ β Gas Specific Gravity
πΏ β Length of Pipeline(mi)
P_1=\sqrt{\bigg(\frac{P_2^2+L(Q(G^{0.425}))}{2826(D^{2.725})}\bigg)^{1.739} }-P_b
P_1=\sqrt{\bigg(\frac{P_2^2+L(Q(G^{0.425}))}{2826(D^{2.725})}\bigg)^{1.739} }-P_b
π β Flow Rate (FT3/day)
π· β Internal Pipe Diameter (in)
πΊ β Gas Specific Gravity
πΏ β Length of Pipeline(mi)
π1 β Upstream Pressure (psig)
π2 β Downstream Pressure (psig)
ππ β Pressure Base (14.73 psia)
P_2=\sqrt{\bigg(\frac{P_1^2+L(Q(G^{0.425}))}{2826(D^{2.725})}\bigg)^{1.739} }-P_b
P_2=\sqrt{\bigg(\frac{P_1^2+L(Q(G^{0.425}))}{2826(D^{2.725})}\bigg)^{1.739} }-P_b
π β Flow Rate (FT3/day)
π· β Internal Pipe Diameter (in)
πΊ β Gas Specific Gravity
πΏ β Length of Pipeline(mi)
π1 β Upstream Pressure (psig)
π2 β Downstream Pressure (psig)
ππ β Pressure Base (14.73 psia)
D=\bigg[ \frac{(QG^{0.425})}{2826(\frac{(P_1(P_1-P_2)P_2)}{L})^{0.575}} \bigg]^{\frac{1}{2.725}}
D=\bigg[ \frac{(QG^{0.425})}{2826(\frac{(P_1(P_1-P_2)P_2)}{L})^{0.575}} \bigg]^{\frac{1}{2.725}}
π· β Internal Pipe Diameter (in)
π β Flow Rate (FT3/day)
πΊ β Gas Specific Gravity
πΏ β Length of Pipeline(mi)
π1 β Upstream Pressure (psig)
π2 β Downstream Pressure (psig)
Case Guide
Part 1: Create Case
- Select the Mueller High Pressure application in the Hydraulics module.
- To create a new case, click the βAdd Caseβ button.
- Enter Case Name, Location, Date and any necessary notes.
- Fill out all required parameters.
- Make sure the values you are inputting are in the correct units.
- Click the CALCULATE button to overview results
Input Parameters
- Temperature base(Β°F)
- Pressure base(psia)
- Gas Flowing Temperature(Β°F)
- Gas Specific Gravity
- Compressibility Factor
- Pipeline Efficiency Factor
- Upstream Pressure(psig)
- Downstream Pressure(psig)
- Flow Rate(MSCFH)
- Internal Pipe Diameter(in)
- Length of Pipeline(mi)
- Upstream Elevation(ft)
- Downstream Elevation(ft)
Downstream Pressure
Flow Rate
Internal Pipe Diameter
Upstream Pressure
Part 2: Outputs/Reports
- If you need to modify an input parameter, click the CALCULATE button after the change.
- To SAVE, fill out all required case details then click the SAVE button.
- To rename an existing file, click the SAVE As button. Provide all case info then click SAVE.
- To generate a REPORT, click the REPORT button.
- The user may export the Case/Report by clicking the Export to Excel icon.
- To delete a case, click the DELETE icon near the top of the widget.
Results
- Downstream Pressure(psig)
- Flow Rate(ft/sec.)
- Internal Pipe Diameter(in)
- Upstream Pressure(psig)
Downstream Pressure
Flow Rate
Internal Pipe Diameter
Upstream Pressure
References
- McAllister, E. W., βPipeline Rules of Thumbβ Gulf Professional Publishing, Seventh Edition
- Menon, Shahi E., βGas Pipeline Hydraulicsβ, Systek Technologies, Inc.
- Carroll, Landon and Hudkins, Weston R., βAdvanced Pipeline Designβ
- American Gas Association (AGA), βReference: Eq-17-18, Section 17, GPSAβ, Engineering Data Book, Eleventh Edition
FAQ
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Purging is a process of removing gas from the pipeline. Controlled purging of gases from pipelines by direct displacement with other gases that have been safely practiced for many years with the recognition that some flammable mixture is present. Purging of gases from pipelines by direct displacement with another gas also has been similarly practiced. It works both ways; however, there will always be an atmosphere of type of a mixture. This is due to the densities of the gases. Check Out
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Pipe erosion begins when velocity exceeds the value of C/SQRT(Ο) in ft/s, where Ο = gas density (in lb./ft3) and C = empirical constant (in lb./s/ft2) (starting erosional velocity). We used C=100 as API RP 14E (1984). However, this value can be changed based on the internal conditions of the pipeline. Check Out
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The maximum possible velocity of a compressible fluid in a pipe is called sonic velocity. Oilfield liquids are semi-compressible, due to dissolved gases. Check Out