2.22.3
Secondary Containment
Fuel storage tanks shall be provided with secondary containment as required
by NFPA 30, paragraph 2-3.4 Control of Spillage from Aboveground Tanks.
2.23
VALVES
Design of valve operators and mechanisms shall avoid initial surges and
sudden inrushes by gradually allowing flows to increase.
2.23.1
Butterfly valve shall be cast iron body with resilient seat, 316 stainless
steel disc and shaft and actuator. Valve shall have fail-safe closing in
ease of a power failure. Valve shall have location limit switch for use in
the control system.
2.23.2
Other Valves
Other valves shall conform to API Spec 6D, ANSI Z21.15 or ASME B16.33 as
appropriate for the type.
2.24
JOINTS
2.24.1
Dielectric Fittings
Dielectric fittings shall be installed between threaded ferrous and
nonferrous metallic pipe, fittings and valves. Dielectric fittings shall
prevent metal-to-metal contact of dissimilar metallic piping elements and
shall be suitable for the required working pressure.
2.24.2
Isolation Joints
Isolation joints shall be installed between non-threaded ferrous and
nonferrous metallic pipe, fittings and valves. Isolation joints shall
consist of a dielectric sandwich type flange isolation gasket with
isolation washers and isolation sleeves for flange bolts. Isolation
gaskets shall be full faced with outside diameter equal to the flange
outside diameter. Bolt isolation sleeves shall be full length. Units
shall be of a shape to prevent metal-to-metal contact of dissimilar
metallic piping elements.
2.24.2.1
Sleeve Type Couplings
Sleeve type couplings shall be used for joining plain end pipe sections.
Each coupling shall consist of a steel middle ring, two steel followers,
two gaskets, and the necessary steel bolts and nuts to compress the gaskets.
2.24.2.2
Split Sleeve Couplings
Split sleeve type couplings may be used in aboveground installations, when
approved in special situations, and shall consist of gaskets and housing in
two or more sections with the necessary bolts and nuts.
2.24.3
Bolts, Nuts, and Fasteners
Bolts, anchor bolts, nuts, washers, plates, bolt sleeves, and all other
SECTION 11378
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