Double wall piping system

Patent · Tue Jun 12 04:00:00 EDT 1990

OSTI ID:6893913

Webb, M C

This patent describes a pumping system for fluid products, such as gasoline, diesel fuel and chemicals, and including a pump for pumping such products from a storage tank through a pipeline connection to a product dispenser. It comprises: a double wall piping system comprising an inner primary pipe, an outer secondary pipe spaced from and surrounding the primary pipe, means for supporting the secondary pipe in spaced relation to the primary pipe so as to create an annular space therebetween, and an air test clamp assembly clamped to the double wall piping system for enabling air pressure testing of a secondary piping system incorporating the secondary pipe, the air test clamp assembly being disposed at a location at which the primary pipe extends beyond the secondary pipe and the air test clamp assembly comprising a fitting member, clamping means for releasably clamping one end of the fitting member to the exterior of the primary pipe and for clamping the other end of the fitting member externally of the secondary pipe, and valve means in the fitting member for permitting connection of the fitting member to a source of air under pressure so that air under pressure can be supplied to the secondary piping system, the air test clamp assembly being affixed to a wall of a unit of the pumping system, the wall having a hole therein through which a portion of the pipeline system extends, and the test clamp assembly further comprising a coupling member including a flange affixed to the wall and a base portion extending through the wall.

• Assignee: NOV; NOV-90-026065; EDB-90-138155
• Patent Number(s): A; US 4932257
• Application Number: PPN: US 7-103469A
• OSTI ID: 6893913
• Country of Publication: United States
• Language: English

Related Subjects

02 PETROLEUM
022000* -- Petroleum-- Transport
Handling
& Storage
CONTAINERS
PETROLEUM PRODUCTS
PIPELINES
PUMPING
PUMPS
TANKS
UNLOADING