To determine the appropriate pipe size for your 150 feet natural gas line, you will need to consider the following factors:
1) Maximum hourly demand: This is the maximum amount of natural gas that will be required by the appliances in your garage at any given time. You can calculate this by adding the BTU ratings of all the appliances that will be connected to the gas line.
2) Pipe length: The length of the gas line will also affect the pipe size. The longer the line, the greater the pressure drop will be, so you will need to use a larger pipe to maintain adequate flow.
3) Elevation difference: If there is a significant elevation difference between the source of the natural gas and the garage, this will also affect the pipe size. The higher the elevation of the garage, the greater the pressure drop will be, so you will need to use a larger pipe.
4) Type of gas: The type of natural gas that you are using will also affect the pipe size. Propane has a higher BTU content than natural gas, so you will need to use a larger pipe for propane.
Based on these factors, the following pipe sizes are recommended for a 150-foot natural gas line:
* For natural gas with a maximum hourly demand of up to 150,000 BTU: 1 inch black iron pipe (BIP) or 1-inch copper tubing (CTS).
* For natural gas with a maximum hourly demand of 150,000 to 300,000 BTU: 1-1/4 inch BIP or 1-1/4 inch CTS.
* For natural gas with a maximum hourly demand of 300,000 to 500,000 BTU: 1-1/2 inch BIP or 1-1/2 inch CTS.
Type of Pipe
The type of pipe that you use for your natural gas line will depend on your specific needs and budget. Black iron pipe is the most common type of pipe used for natural gas lines, but copper tubing is also an option.
* Black iron pipe is strong and durable, and it can withstand high temperatures and pressures. However, it is also susceptible to corrosion, so it must be protected with a coating or sealant.
* Copper tubing is less susceptible to corrosion than black iron pipe, but it is also more expensive. It is also not as strong as black iron pipe, so it is not recommended for use in high-pressure applications.
Installation
The installation of a natural gas line should be performed by a qualified plumber. The plumber will need to obtain a permit from the local building department before starting work. The plumber will also need to follow all applicable safety codes and regulations.
