What size should a branch piping outlet be if installed in the main supply piping before its size is known?

The appropriate size for a branch piping outlet installed in the main supply piping should be the same size as the main supply piping. This uniformity in size helps maintain proper pressure and flow rates within the system, ensuring that gas flows efficiently without unnecessary losses or restrictions.

When a branch outlet is of the same diameter, it allows for a consistent cross-sectional area that minimizes turbulence and the potential for pressure drops. If the branch were to be smaller, it could create a bottleneck, causing flow issues and inefficient system performance. Conversely, making it larger than the main piping could disrupt the flow dynamics, potentially leading to problems like back pressure.

By matching the branch piping outlet size to that of the main supply, gas technicians ensure that the system operates effectively and safely, adhering to industry standards and best practices.