Which type of pipe does not require a special listing to use threaded fittings?
A.
Schedule 5
B.
Schedule 7
C.
Schedule 10
D.
Schedule 40
The Answer Is:
D
This question includes an explanation.
Explanation:
Schedule 40 pipe does not require a special listing to use threaded fittings, as it is a common standard for pipe thickness and is widely used in fire protection systems for its durability and compatibility with standard fittings.
References: Piping standards and fire protection system design practices, where Schedule 40 pipe is a common choice for its balance of strength and workability.
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