2.10
PETROLEUM STORAGE TANKS
**************************************************************************
NOTE: Select the applicable section used in the
**************************************************************************
See Section [13216 UNDERGROUND PETROLEUM TANKS] [15192N FUEL OIL PIPING].
PART 3
EXECUTION
3.1
EARTHWORK
Excavation and backfilling for tanks and piping shall be as specified in
Section 02300 EARTHWORK.
3.2
PIPING
**************************************************************************
NOTE: Piping must maintain the specified minimum
pitch and must not be encased in concrete. Most
types of pumps normally installed at automotive
service stations cannot deliver fuel past a vapor
lock. Vapor locks can occur where a portion of the
pipe run is installed higher than the pipe elbow
below the pump pedestal, especially if the pipe is
encased in concrete and absorbs enough heat on warm
sunny days to vaporize the fuel.
**************************************************************************
Piping system shall be steel or nonmetallic. Nonmetallic pipe shall be
used for buried lines only. Buried lines which carry product shall have
double-walled containment system. Each section of underground pipe shall
rest solidly on pipe bed. Piping connections to equipment shall be as
required by equipment manufacturer. Make tank connections with two elbow
swing joints or flexible connectors to allow for differential settlement.
Threaded or mechanical joints shall be allowed at termination points of
product carrying lines only. Test plug connections of secondary
containment piping may be threaded. Clean pipe interior of foreign matter
before lowering into trench and keep clean during installation. Pipe shall
not be laid in water or when trench or weather conditions are unsuitable.
When work is not in progress, close open ends of pipe and fittings so that
water, earth, or other substances cannot enter. Replace pipe, fittings, or
appurtenances found defective after installation. Make threaded joints
with tapered threads and make tight with joint compound; compatible with
intended petroleum products, applied to male threads only. This
requirement shall not apply for gauging hatch or similar connections
directly over the tank where line terminates in a fitting within a manhole
designed to allow for differential settling. Flanges shall not be
permitted on buried lines.
3.2.1
Installing Piping
Handle pipe and accessories to ensure sound, undamaged condition. Take
care not to damage coating when lowering pipe into trench and when
backfilling. Install nonmetallic pipe in accordance with pipe
manufacturer's instructions. Lay underground pipelines with a minimum
pitch of 25 mm per 15 meters one inch per 50 feet. Horizontal sections
shall have a minimum coverage of 457 mm 18 inches. Piping shall be free of
SECTION 15193N
Page 15
Previous Page
