§ 2-42. Oil separators.

A. 

All garage floor drains shall discharge into dry wells. When necessary to connect to a sewer, an approved oil separator must be used. Oil separators installed in any building where volatile fluids are used must be arranged to be readily accessible, and to receive only volatile fluids. They must not receive the discharge of any water closet, rain leader, yard, court or area drain.

B. 

Oil separators must, if discharged by gravity, be connected by a Y-branch fitting to the house drain behind the house trap in such manner that they will not interfere with the house drain and the rest of the plumbing and drainage system. When mechanical force is used to discharge the contents, the connection must be made by a Y-branch fitting on the sewer side of the house trap.

C. 

No separate running trap need be provided on the drain entering oil separators, but a separate fresh air inlet and vent line must be provided to keep the system of drainage controlled by the oil separator entirely separate from the rest of plumbing and drainage system.

D. 

The size of the fresh air inlet shall be determined by the size of the inlet connection to the oil separator, which shall be considered the same as the term "house drain" for determining the size of all fresh air inlets, which shall conform to the same requirements as regards size and arrangements of terminals for fresh air inlets as called.

E. 

Vent lines shall conform in all respects to vent lines for plumbing fixtures as regards size and arrangements.

F. 

Relief pipes at least 1 1/2 inches in diameter must be provided. They may be connected to a vent line when installed as a separate system or must be carried independently above the roof.