renewable seats and disks. Ensure check valves conform to API
Spec 6D. Use diaphragm non-surge check valves with flow
control feature on the discharge of all pumps.
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 above or below ground, between
pier and tank storage, and other locations critical to
pressure-testing of piping. Do not use lubricated plug
e) At inlet to truck fill stand and on supply and
return risers at aircraft direct fueling stations (Army and
Navy projects only), provide fusible link valve high-
performance wafer trunion (butterfly) fire-safe with coil
spring. Use fusible link set to release at 165 EF (74 EC).
Valve Operators. Provide manually operated valves
Use geared operators for ball and plug valves larger than 6
inches (150 mm). Ball and plug valves specified for remote,
automatic, or emergency service may have electric motor
operators, if approved by Service Headquarters. Provide
locking tabs on valves to allow padlock to be used for lock-
out during maintenance.
to control flow and to permit isolation of equipment for
maintenance or repair. Provide additional valves at required
Provide 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) Provide double block and bleed valves where
piping goes below/aboveground and requires periodic pressure
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.