Table of Contents
Advertisement
BULKHEAD
T20874
A bobtail truck can provide enough pull on the hose
connection to cause a break in the system. That
break must not occur between the Type N550 and the
storage tank.
Fusible Element Location
A fusible element that will close the Type N550 shall be
located within five feet of the hose connection. If the
Type N550 is placed within five feet of the hose
connection, this requirement is met. If not, an additional
fusible element must be provided near the hose coupling
which will activate a remote release.
Remote Release Installation
In all installations a remote release shall be connected
to the latch on all emergency valves at the bulkhead.
The remote release has to extend to a place where it
can be easily reached to close the Type N550 valve(s)
in the event that an emergency makes the valve(s)
inaccessible. The remote release shall shutdown all
emergency valves when activated. Remote release
activation may be by cable or pneumatic hook-up.
Cable Hook-Ups
!
Remote release cables shall be installed
so that they will close the Type N550
valve(s) when pulled from the farthest
HOSE CONNECTION
12 (305)
OR MORE
Figure 2. Typical Installation of Type N550 Using Remote Cable Release
WARNING
NAMEPLATE UP
EMERGENCY SHUTOFF
VALVE TYPE N550
FIXED PIPING
remote location. Cable shall operate
smoothly, over pulleys and/or through
conduit. Do not kink cable or run cable
around sharp corners. If installed in
conduit, keep water out of conduit.
Frozen water, dirt or dried mud in the
conduit will render the remote
release inoperable.
Remote releases used on Type N550
valves shall not:
(a) be made from plastic or fiber rope;
(b) have any kind of fusible link which
could melt and prevent the cable
from pulling the Type N550 latch.
To provide a remote release, aircraft cable can be
connected to the short looped cable on the valve and
run to the remote release point over pulleys or through
conduit. Adjust the cable so that minimal pull is
required to close the emergency valves.
Type P164B Cable Installation
To connect a Type P164B remote release assembly, which
is supplied with 50 feet (15 m) of cable:
1. Run the inner cable and housing assembly to the
remote release point. Leave enough slack on
each end for a smooth, flowing path, without sharp
bends in the cable, between the Type N550 latch
block and remote release handle.
Type N550
REMOTE CABLE TO
SAFE LOCATION
INCHES
(mm)
3
Advertisement
Table of Contents
