TM 9-2320-280-20-3
I
11-166. NBC AIR LINE PIPING MAINTENANCE
This task covers:
a. Removal
c. Installation
b. Air Line Piping Fabrication
INITIAL SETUP:
Applicable Models
Materials/Parts
M996, M996A1, M997, M997A1, M997A2
Adhesive (Appendix C, Item 6)
Tools
Manual References
General mechanic’s tool kit:
TM 9-2320-280-10
automotive (Appendix B, Item 1)
TM 9-2320-280-24P
NOTE
l Replacement and repair for NBC air lines in M996, M996A1,
M997, M997A1, and M997A2 ambulances are basically the
same. This procedure gives general guidelines for repair or
replacement of PVC pipe.
c The PVC pipe used in ambulance NBC air lines is made up of
tees, elbows, connecters, and miscellaneous lengths of straight
pipe. All of these are connected and sealed with PVC adhesive.
Before beginning a repair or replacement procedure, ensure that
you have all necessary pipe, connectors, and PVC adhesive.
Remove section of damaged pipe (6). Damaged pipe section (6) will have to be cut from system because
pipe joints cannot be separated without damaging components.
b. Air Line Piping Fabrication
1.
2.
3.
4.
5.
6.
Cut a section of new pipe (2) 1/16 in. (1.6 mm) smaller than damaged pipe section (6).
NOTE
Perform steps 2 and 3 before applying PVC adhesive.
Install two connectors (3) on new pipe section (2).
Install connectors (3) and new pipe section (2) on pipe ends (4) to ensure correct fit and then remove
connectors (3) and new pipe section (2).
NOTE
Clean ends of pipe with emery cloth before applying adhesive.
Apply PVC adhesive to one end of connectors (3) and both ends of new pipe section (2).
Install two connectors (3) with PVC adhesive coated ends inward, to new pipe section (2) and twist
components 70-90°. If an elbow (1) or tee (5) is being installed, twist components together 70-90°
and then turn components to their proper orientation. Allow PVC adhesive to dry.
Apply PVC adhesive to connectors (3) and pipe ends (4).
c. Installation
Install connectors (3) and new pipe section (2) on pipe ends (4) and twist 70-90°. Allow PVC adhesive
to dry.
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