Final answer:
The type of hanger that allows for thermal expansion of the pipe is a Clevis (option a) hanger. It secures the pipe while providing an allowance for movement during temperature changes, hence preventing stress or damage from thermal expansion.
Step-by-step explanation:
The type of hanger that grasps the pipe but allows for thermal expansion of the pipe is a Clevis hanger. This hanger design enables it to hold the pipe securely while also providing a pivoting point that lets the pipe expand and contract without causing stress or damage.
The Clevis hanger includes a yoke-shaped component that the pipe rests in, and a horizontal bolt that closes the yoke to secure the pipe. During thermal expansion, the pipe can freely move longitudinally, helped by the hanger's design.
Other types like the Split ring, Swivel, and J-hook hangers have different functions and may not all allow for thermal expansion:
- Split ring hangers are often used for suspending stationary non-insulated pipelines.
- Swivel hanger designs can pivot to some degree but may not be designed for expansion.
- J-hook hangers are more for supporting lightweight pipes with no expansion accommodation.