For multiple adjacent trapped branch pipes in dry systems, tie-in drains should be pitched how many inches per 10 feet?

For multiple adjacent trapped branch pipes in dry systems, it is essential to ensure that any moisture or condensation that may develop within the pipes is effectively drained off to prevent any blockage or potential freezing of water in the piping. The standard practice for pitching tie-in drains is to provide a slope that facilitates gravity drainage.

A pitch of 1/2 inch per 10 feet is the correct standard because it allows sufficient drainage without being too steep, which can lead to issues with sediment buildup or inadequate flow. This degree of slope optimizes the removal of water that may accumulate within the branch pipes, maintaining a dry system and ensuring that it operates effectively without interruptions caused by water ingress.

Other options, while they might also be seen in different contexts or specific applications, do not conform to the standard recommended pitch for dry fire protection systems.