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Natural Gas (or any Combustible Gas) Piping Pressure Drop

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This computer program calculates the piping pressure drop for Natural Gas or any other combustible gas such as Propane, Methane, Landfill Gas, Anaerobic Digester Gas, Municipal Waste Pyrolysis Gasification Syngas and Coal Gasification Syngas to mention a few. The Engineer must input the percent volume of each component gas that makes up the gas that is flowing through the pipeline. He must also input the pressure of the gas entering the pipeline, the gas temperature, the amount of gas flowing through the pipeline (Btu/hour – HHV), the pipe outside diameter, inside diameter and the total equivalent pipe length. The program first calculates the properties of the gas flowing through the pipeline and then calculates the pipe line pressure drop using the gas properties and flow. Listed below are some of the required computer inputs:
1. Percent Volume of Each Component Gas
2. Barometric Pressure
3. Gauge Pressure of the Gas Entering the Pipeline.
4. Temperature of the Gas Entering the Pipeline
5. Amount of Gas Flowing Through the Pipeline (Btu/hour – HHV)
6. Type of Piping ( Steel, Plastic, Copper etc.)
7. Pipe Outside Diameter
8. Pipe Inside Diameter
9. Pipeline Total Equivalent Length (feet)

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Example - Natural Gas Piping Pressure Drop for a Home Furnace

A. Given Data
1. City Line Gas Pressure:
35 psig
2. Natural Gas Pressure Regulator At Home
3. Natural Gas Pressure Leaving the Pressure Regulator:
7.00 inches w.c.
0.2528 psig
0.5148 inches Hg
4. Natural Gas Furnace Maximum Gas Usage:
60,000 Btu/hr
5. Required Gas Pressure At The Furnace:
5.00 inches w.c.
0.1806 psig
0.3677 inches Hg
6. Natural Gas Properties:
Assumed Standard Natural Gas
HHV = 1040 Btu/ft3 at 60 F and 30.00 inches Hg
HHV = 22,708.49 Btu/lb
Specific Gravity = 0.60
7. Piping Length: 100 feet Equivalent (includes straight pipe and fittings)
B. Piping Analysis
1. Piping must be Schedule 40 Threaded Pipe
2. Pressure Drop Analysis

Inlet Gas Pressures Into The Furnace Based On
The Piping Pressure Drop Analysis
3/8 Inch Pipe
4.8237 inches w.c.
(pressure too low)
1/2 Inch Pipe
6.3006 inches w.c.
(pressure is ok)
1.0 Inch Pipe
6.9527 inches w.c.
(pressure is ok)


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