What is the equivalent of a 2-inch NPS Schedule 40, 90 degree threaded elbow?

The equivalent length of a fitting, such as a 2-inch NPS Schedule 40, 90-degree threaded elbow, refers to the additional length that this fitting adds to the overall pipeline system when calculating pressure drop or system resistance. In terms of equivalent length, fittings are treated as if they were extra feet of straight pipe based on their impact on the flow characteristics.

For a 2-inch NPS Schedule 40, 90-degree elbow, industry standards and tables show that the equivalent length is approximately 5.17 feet. This means that when you're calculating pressure losses or sizing your system, you would treat this 90-degree elbow as if there were an extra 5.17 feet of pipe in that leg of your piping system. This helps in effectively sizing pumps and ensuring that the flow rates meet the system’s requirements.

The value serves as a crucial parameter in the design and analysis of gas systems, ensuring proper performance under expected operating conditions. The other choices represent alternative lengths that do not accurately reflect the industry-standard resistance introduced by this type of fitting.