Brunswick 750 IMPACT, Operation & Maintenance Manual

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7-3
Collar Maintenance Section 7
Collar Layout
The collar system is manufactured and tested sepa-
rate from the boat and mechanically attached after the
hull is complete. The collar consists of seven separate
inflation chambers. Each inflation chamber has one
inflation valve, one over-pressure valve, and at least
one pressure-equalization baffle.
The collar is attached to the hull using two continuous-
length fabric mounting straps. One strap is attached
to the inside hull and one is attached to the outside
hull. The fabric mounting straps are attached using
continuous-length HDPE clamping bars and stainless
steel screws. The stainless steel screws mate with
holes drilled into Aquaplas plates which are laminated
into the hull.
The collar might have a military boarding chafe system
(MBCS) and a continuous-length rubbing strake to
help protect against puncture and abrasion damage.
The collar system can be removed for replacement or
major repairs. Refer to Collar Removal and Installa-
tion in this section for detailed service information.
1. FRP hull
2. Collar system
3. Fabric mounting straps
4. HDPE clamping bars
5. Over-pressure valves, 3.9 PSI (269 mB)
6. Inflation valves, 3.48 PSI (240 mB)
7. Pressure-equalization baffles