Question

Drainage pipe cleanouts should be installed not more than _________ apart in horizontal drainage lines measured from the upstream entrance of the cleanout.

Answer 1

Drainage pipe cleanouts should be installed not more than 15 diameters apart in horizontal drainage lines.

Step-by-step explanation:

Drainage pipe cleanouts should be installed not more than 15 diameters apart in horizontal drainage lines measured from the upstream entrance of the cleanout. An older "rule of thumb" suggested 5 side-to-side and 7-8 deep, but newer work suggests as much as 8 diameters side-to-side and 15 diameters deep.

Cleanouts shall be installed not more than 100 feet (30 480 mm) apart in horizontal drainage lines measured from the upstream entrance of the cleanout. When installed in underground drains, cleanouts shall be extended vertically to or above finished grade either inside or outside the building.

All horizontal drains shall be provided with cleanouts located not more than 100 feet (30 480 mm) apart.