Md. Code Regs. 26.10.03.06

Current through Register Vol. 51, No. 22, November 1, 2024

Section 26.10.03.06 - Piping Installation

A. An owner and an operator of a UST system shall comply with the installation requirements of this regulation.

B. Install piping in accordance with the requirements of this regulation.

C. Place underground piping on a 6-inch bedding of appropriate backfill material as described in Regulation .04 of this chapter.

D. Maintain the following clearances when installing piping:

(1) Twice the nominal diameter of the pipe but at least 4 inches between all piping;

(2) At least 6 inches between piping and electrical conduits related to the UST system;

(3) At least 6 inches between piping and excavation zone sidewalls; and

(4) At least 18 inches between piping and the surface of the ground.

E. Unless otherwise approved by the Department, ensure piping rises 1/8 of an inch for each lateral foot from the UST to the piping endpoint.

F. Follow the manufacturer specifications and installation requirements when installing piping.

G. In accordance with manufacturer specifications, use a UL listed flexible connector to connect piping as follows:

(1) Except for a direct fill line, to connect a pipe carrying a regulated substance to a UST at the end of a piping run; and

(2) To connect a pipe carrying a regulated substance to a dispenser system.

H. Unless otherwise approved by the Department, an owner and an operator of a UST system may not use a flexible connector to connect piping carrying petroleum vapor or a regulated substance at any other point in the piping system not listed in §G of this regulation.

I. Place a UL listed shear valve on pressurized product piping dispensing motor fuel, and properly anchor the shear valve at the dispenser.

J. Install appurtenances such as water or air piping in a separate piping trench;

K. Ensure vent lines above the ground surface are:

(1) Constructed with at least schedule 40 steel;

(2) Protected from traffic;

(3) Properly anchored; and

(4) Protected from weather and debris.

L. Ensure the vents of a UST system storing a flammable or combustible liquid meet the following conditions:

(1) If the UST system stores a flammable liquid, the vents terminate 12 feet above the ground surface and 2 feet above an attached building; and

(2) If the UST system stores a combustible liquid, the vents terminate at least 3 feet above the ground surface.

Md. Code Regs. 26.10.03.06

Regulation .06 adopted effective 49:12 Md. R. 642, eff. 6/13/2022