Kidde Fire Protection 400 Series, Design, Installation, Operation, And Maintenance Manual

Page: 114 / 190

Installation
July 2018 4-26 06-237518-001
4-9.5.5 Threaded Pipe Assemblies
For pipe thread fittings sealed using a metal-to-metal connection, the metal of the male and
female fittings deforms during installation to create this seal. As a result, pipe thread
connections tend to leak after a connection is made and then disassembled and re-assembled.
If the connection leaks after re-assembly, you may need to replace one or more of the fittings.
Continuing to tighten the connection will not necessarily eliminate the leak and can easily result
in a split fitting or port.
1. Inspect port and fitting to ensure that both are free of contaminants and excessive burrs
and nicks.
2. Apply a stripe of an anaerobic liquid pipe sealant around the male threads leaving the first
two threads uncovered. If no liquid sealant is available, wrap Teflon tape 2-1/2 turns in a
clockwise direction, viewed from the pipe end, leaving the first two threads uncovered (only
use tape suitable for gas applications).
3. Screw finger tight into the port.
4. Wrench tighten the fitting. When installing elbows or tees, consider final orientation posi-
tion as to not require excessive tightening to fit properly. A properly assembled fittings total
thread engagement should be 3.5 to 6 turns.
4-10 TEST OF PIPEWORK
Each nozzle location or the last nozzle location on each branch should be blanked off,
pressurized, and blown through using either an air compressor or dry nitrogen.
4-11 NOZZLE INSTALLATION
After the system piping has been leak tested and blown free of debris, install the discharge
nozzles in strict accordance with the approved installation drawings and acceptable
engineering practices. Orient the nozzles as shown on drawings. Make certain the correct
nozzle type, part number, and orifice size are installed in the proper locations. Ensure that the
nozzles are securely tightened to the piping.
An Agent discharge nozzle consists the following
•
Project Specific Orifice Plate
• Nozzle Body
• Orifice Securing Ring
Nozzles have a female taper thread; (NPT or BSPT) or as specified in the project
documentation. The orifice diameter is stamped on the hexagon of the nozzle.
Care shall be taken that the Nozzles are complete (orifice plate inserted and secured) and that
no damage to the thread has occurred.
Note: Dirt traps at least 50 mm (2-inches) in length, consisting of a barrel nipple and blanking
cap must be installed at the end of each pipe run, including runs which end in a nozzle.
Figure 4-20. Nozzle with Dirt Trap
WARNING
Teflon tape and some pipe sealants are destructive to hydraulic components.
Always use extreme caution and follow manufacturer’s recommendations for
proper application of any sealant in order to prevent contamination.
Dirt Trap
Last Nozzle
in Pipe Run