Class 5 Boiler Practice Exam

When adding a pipe branch connection by welding, what must be performed?

1. Pre-heating of the pipe

2. Reinforcement

3. Stress relieving

4. Inspection by a supervisor

The correct answer is: Reinforcement

Adding a pipe branch connection by welding requires reinforcement to ensure the structural integrity and load-bearing capacity of the joint. When a branch connection is welded onto a pipe, it creates additional stress in the area where the branch intersects the main pipe. This stress can lead to issues such as cracking or failure if the joint is not adequately supported. Reinforcement is necessary because it helps to distribute the load more evenly across the weld and the adjoining materials. It also compensates for the reduced thickness of the pipe wall at the connection point. Depending on the specific application and the diameter of the pipe, engineering standards may dictate the type and amount of reinforcement needed. Other steps in the welding process, such as pre-heating, stress relieving, and inspection, can also be important but are not specifically required when initially adding the branch connection. Pre-heating is typically employed to minimize thermal stresses and prevent cracking in certain materials, while stress relieving is a post-weld heat treatment aimed at reducing residual stresses. Inspection is necessary for quality assurance, but reinforcement is the critical action needed when making the connection itself.