valves with flow control feature on the discharge of all
centrifugal type pumps. Ensure check valves conform to the
requirements of API Spec 6D.
d) Use double-seated, tapered lift, plug valves with
an automatic body bleed between the seats (double block and
bleed) for separation of product services, on tank shell
connections, when piping goes below ground, between pier and
tank storage, and other locations critical to pressure-testing
of piping. Do not use lubricated plug valves. Include body
cavity thermal pressure relief feature.
e) Provide at inlet to truck fill stand (Army and
Navy projects only) fusible link valve high-performance wafer
trunion (butterfly) fire-safe with coil spring and fusible
link to release at 165 EF (74 EC).
Valve Operators. Manually operate valves not
geared operators for gate valves larger than 6 inches (150
mm). Use geared operators for ball and plug valves larger
than 6 inches (150 mm). Gate, ball, and plug valves specified
for remote, automatic, or emergency service may have electric
motor operators, if approved by Service Headquarters.
Consider the use of locking tabs on valves to allow padlock to
be used to lock out the valves during maintenance.
control flow and to permit isolation of equipment for
maintenance or repair. Provide additional valves at locations
manually operated valves, except where motor operators are
specifically authorized by applicable standard drawings or
technical specifications. As a minimum requirement, provide
block valves at the following locations:
a) Where piping goes underground or comes
aboveground and requires periodic pressure testing.
b) At all subsurface and aboveground piping
connections to storage tanks.
c) On each branch line at the point of connection to
the main product pipeline or header.