Which pipe fittings are generally required at pipe penetrations through walls?

At pipe penetrations through walls, relieving arches are commonly required to provide adequate support and ensure the structural integrity of the wall around the pipe. These fittings create a load distribution system that alleviates stress on the pipe where it passes through the wall, preventing any potential damage due to weight or movement.

This is particularly important in construction and plumbing work, as it addresses concerns about settling and shifting that may occur over time. Relieving arches are designed specifically to handle these situations, allowing pipes to function effectively without compromising the wall structure or leading to leaks or failures.

Other fittings like elbows, tees, and couplings serve different purposes in plumbing systems, such as changing the direction of flow or connecting different sections of pipe. However, they do not provide the necessary support at penetration points in the same way that relieving arches do, making them unsuitable for this specific requirement.