Spitzglass

There are two forms of the Spitzglass Equation: one for low pressures (less than or equal to 1 pisg) and one for pressures higher than 1 psig. The low-pressure equation is the following. It was implemented to determine a pressure drop in a pipe segment under various flowrates in a like fashion to the other equations in this manual. This equation has similar accuracy issues as with other distribution system equations. It can be used within the following ranges:

Where:

𝑄 − Flow Rate (FT³/day)

E – Pipeline Efficiency Factor𝑇_𝑏 −Temperature Base (°R)

𝑇_𝑏 −Temperature Base (°R)

𝑃_𝑏 − Pressure Base (psi)

𝐷 − Internal Diameter (in)

𝑃₁ − Upstream Pressure (psi)

𝑃₂ − Downstream Pressure (psi)

𝐺 − Gas Specific Gravity

L_e − Pipe Segment Length including Expansion (mi)

𝑇_𝑓 − Gas Flowing Temperature (°R)

𝑍 − Compressibility Factor

   

Input Parameters

1. To create a new case, click the “Add Case” button
2. Select the Unknown and desired Flow Equation.
3. Enter Case Name, Location, Date and any necessary notes.
4. Fill out all required fields.
5. Make sure the values you are inputting are in the correct units.
6. Click the CALCULATE button.

• Temperature base(°F)
• Pressure base(psia)
• Gas Flowing Temperature(°F)
• Gas Specific Gravity
• Compressibility Factor
• Pipeline Efficiency Factor
• Upstream Pressure(psig)
• Flow Rate(MCFD)
• Internal Pipe Diameter(in)
• Length of Pipeline(mi)
• Upstream Elevation(ft)
• Downstream Elevation(ft)

 

Outputs/Reports

1. View the results.
2. If an input parameter needs to be edited be sure to hit the CALCULATE button after the change.
3. To SAVE, fill out all required case details then click the SAVE button.
4. To rename an existing file, click the SAVE As button. Provide all case info then click SAVE.
5. To generate a REPORT, click the REPORT button.
6. The user may export the Case/Report by clicking the Export to Excel/PowerPoint icon.
7. To delete a case, click the DELETE icon near the top of the widget.

• Flow Rate(ft/sec.)
• Transmission Factor
• Velocity(ft/sec.)
• Upstream Pressure(psi)
• Transmission Factor
• Velocity(ft/sec.)
• Downstream Pressure(psi)
• Transmission Factor
• Velocity(ft/sec.)
• Erosional Velocity
• Sonic Velocity

 

Flow Rate

   

Upstream Pressure

   

Downstream Pressure

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