10
III. PREPARATIONS
Tire & Wheel Preparation
Any pneumatic tire can be flatproofed regardless of pressure or
rated load specifications. (photo 10a) New tires provide the best
long term value, although used tires are often flatproofed.
All new tires should be prestretched before filling. Inflate new
tires to the maximum rated inflation pressure and maintain
overnight. Tires grow during service and prestretching allows
the tire to be filled to its capacity and will minimize long term
carcass growth. Used tires do not need to be prestretched and
typically take 15-20% more material than new tires.
Tires, especially used tires, should always be inspected prior
to flatproofing. Flat tires should be repaired. To be effectively
flatproofed, tires must be able to hold air for at least three hours
and be free of cuts or other defects that reduce casing strength.
Wheels should be inspected for cracks, metal fatigue and
corrosion. Damaged or rusted wheels are a safety hazard and
should be avoided.
Tires and wheels have recommended load carrying capacities.
The load carrying capacities should not be exceeded. When
calculating the load weight, take into consideration the extra
weight of the flatproofing material.
A tire or wheel with a defect should not be used in flatproofing,
as it could result in a premature tire or wheel failure. Allow time
for drying if washing is required.
Tire contaminants, such as water, sealants, glycol, calcium
chloride, soaps, waxes, or even dirt, must be removed before flatproofing.
For tube type tires, always use new properly sized tubes. Wheels that require the use of flaps
to protect the tube during inflation and operation must be filled with the flap in place. If you
remove the flap, the tube has a greater chance of rupturing during the flatproofing and curing
process.
Tire and wheel assemblies should be at a minimum 72° F (22° C) before processing. Cold tires
will slow the curing process.
Equipment Set-up
1.
Arrange Totes and Drums - Totes and drums should be arranged with the “ISO” side on the
left and the “CAT” side on the right. (photo 10b) The lower cylinders of the pump are labeled as
to which hose goes to which side. When moving the pump, be sure to keep tote/drum hoses on
their proper side. It is a good idea to place roofing felt in the pumping area, especially under
the tire being filled, for easier clean-up. (photo 10c)
2. Assemble Tools and Supplies - Make certain all necessary tools (valve core remover, extra
valves, screws, hammer, screwdriver, pliers, bags, etc.) are on hand. If possible, stage the tires
to be filled in the vicinity of the pump.
10a
10b
10c
