Great Dane Champion CP Manuale di manutenzione - Pagina 14

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insulation trailer maintenance

Exteriors: Cleaning the outside of refrigerated trailers

should be done the same way dry-freight vans are

cleaned. Live steam does a good job of cleaning and

brightening the exterior surfaces of van trailers.

Application of a protective transparent coating may be

used to protect the exterior surface from further oxida-

tion. Do not use brighteners or acids on the trailer.

Note: A trailer with open holes should not be steam

cleaned until the holes have been patched or panels

replaced. Allowing moisture or chemicals to enter the

walls or roof through holes will cause corrosion and

may add weight to the trailer.

CHECK INSULATION EFFICIENCY

Weigh the trailer at regular intervals to determine if

there is moisture accumulation or water pickup

through condensation or leakage into the insulation.

maintaining insulation efficiency

MOISTURE PICKUP THROUGH CONDENSATION

If it has been determined that you have moisture

contamination in the insulation cavity, you should

take one of the following steps:

a. Open the doors of the trailer and park it in the sun.

It takes several days of hot, sunny weather to

equalize water vapors trapped in the trailer body

with that of the outside air, or;

b. Place the trailer in a controlled-heat, paint-drying

oven to speed up the process of drying.

RAIN WATER LEAKAGE

a. Check outside and inside of trailer for holes and

loose joint seams through which moisture may

seep.

b. Waterproof all openings immediately by patching

and sealing, or both, especially after accidents in

which body and roof skin may have been cut.

Synthetic-rubber-base-type sealer should be used

for closing all minor openings.

safety measures — urethane foam

URETHANE FOAM FLAMMABILITY

Urethane foam has achieved an extensive history in a

variety of applications, including insulation in refrigerat-

ed trailers, because the performance of urethane insula-

tion has been superior to other materials.

One area of concern is the fire potential and flammability

of urethane when exposed during repair of surrounding

areas. Urethane foam is combustible like cork, wood or

other organic materials. When urethane is exposed to

the intense heat of welding, flame cutting or other hot

work wherein a high-density heat source is used in

repairing an insulated trailer, certain precautions must

be observed. Urethane foam burns (including fire-retar-

dant types) producing toxic smoke which may or may

not be visible to personnel.

continued

Check for spots where water may leak out during clean-

ing, other than from regular drain holes. This indicates

water entrance into the insulation. The areas allowing

water to enter must be located and properly sealed.

Keep a record of the length of time the mechanical

refrigeration unit cycles and its frequency. An increase,

of an appreciable degree, in frequency and in duration

of the cycles, or both, could indicate a general deterio-

ration either in the trailer insulation or refrigeration unit.

Excessive air leakage may cause the refrigeration unit

to run for long periods of time. Excessive air leakage

indicates problems such as perforated walls or worn

out areas of door seals or door locks around vents, side

doors, and refrigeration units. These areas should be

repaired.

EXCESSIVE CYCLING OF REFRIGERATION UNIT

If the unit is operating properly, the excessive cycling

could be caused by:

a. Air transfer through leaking door seals.

b. Deterioration of insulation.

c. Unusually hot surrounding temperature.

d. Refrigeration unit improperly sized for the intended

temperature for that cargo.

SUBFLOORS

Since subfloors are enclosed on the top side and open

at the bottom, they are subject to considerable road

splash and corrosion. Where they have deteriorated

they should be repaired or replaced.

DOORS, VENTS, HATCHES

When seals are worn out they must be replaced.

Check and correct, as required, the alignment of door

hinges and locks.

PRECAUTIONARY MEASURES

Clean the work area. Never allow urethane scrap

or other organic materials to be in the work area or

around the trailer. Do not allow foam material to

accumulate on the job site.

1. Under no circumstances shall a direct flame be

allowed to contact urethane foam. Urethane foam

must be mechanically cut away and totally removed

from around the repair area by at least two feet or

an obviously safe distance away to prevent any

flame from coming in contact with the urethane

materials.

2. All combustible materials below the workpiece

must be removed to prevent ignition from hot

sparks or slag.

3. Should ignition or combustion of the urethane

become evident (flame, smoke, charring, odor, etc.),

hot work must be stopped immediately. All flames

must be extinguished and additional urethane

materials must be removed from the workpiece

and/or workplace before hot work is continued.

4. A fire watcher equipped with a 15-pound CO

dry-chemical extinguisher must be posted at the

job site during all hot work operations, and must

remain for at least 30 minutes after such operations

have been completed.

5. All work involving heat, especially burning and

welding, must be performed in a well-ventilated

area.

6. Interrupt burning and welding occasionally to

prevent a buildup of heat.

7. Workers shall know what to do in the event of an

emergency. Prior to work being started, workers

must be aware of how to contact fire and medical

personnel should the need arise.

8. In the event a urethane fire is encountered,

immediate steps shall be taken to avoid breathing

the toxic fumes associated with such fires.

platform trailers

MAIN BEAMS

Platform trailers are constructed such that the main

beams provide both the load-bearing and load-carrying

capability. It is important that no welding, burning,

drilling, etc. ever be done on these main beams, as

the structural capability will likely be drastically affected.

No such items as sliding-base winches should be

added to these beams as they would tend to twist the

beams, especially on wide-frame platforms. The ability

of these beams to take loads would be impaired due

to the twisting.

If modification of the beam is ever necessary, the

factory should be consulted prior to doing the work.

CROSSMEMBERS

Crossmembers are used not only to carry loads into the

main beams but are also used to maintain the main

beams in a vertical direction. Any area where cross

converter dolly

The fifth wheel on the dolly should be maintained in

accordance with the vendor's recommendations. The

suspension should be maintained following the same

recommended preventative maintenance practices as

previously listed for trailers.

Maintenance of grease lubricants on the fifth-wheel

race is critical in the operation of multi-unit equipment.

Dry fifth-wheel tables will result in "sticking" of the

coupler plates during operation which can result in

a "whipping" action of the multi-unit equipment.

Personnel fighting the fire must be equipped with

NIOSH-approved, self-contained breathing appara-

tus. Personnel not equipped with NIOSH-approved,

self-contained breathing apparatus must leave the

area immediately.

warning

This trailer is insulated with urethane foam which

is an organic material.

The following precautions shall be observed:

1. Urethane foam will burn when exposed to

flame or extreme heat. Foam shall be shield-

ed with a thermal barrier when welding or

torch cutting in its vicinity. Fire extinguishing

equipment should be readily available.

2. Fires involving urethane can be extinguished

with water, carbon dioxide or dry chemicals.

Personnel fighting the fire shall be equipped

with NIOSH-approved, self-contained breath-

ing apparatus.

members have been removed for any reason may

cause twisting of the main beams and could cause a

structural failure.

EXTENDABLE PLATFORMS

The extendable platforms have more inspection points

due to their complexity. In addition to the main rails and

crossmembers, the lock pins should be inspected for

proper protrusion and wear. If the diameter of the lock

pin has 1/4" or more of wear it should be replaced.

The lock-pin safety-lock mechanism should also be

inspected for proper operation. The two sections ride

on rollers that have fittings to allow them to be greased

at regular intervals. One additional caution is to keep

the caps on all air connectors when they are not in

use. These caps are necessary to keep dirt out of the

air system.

warning

All coupling and safety devices associated with

multi-unit operation must be inspected prior to

each coupling to insure safe operation.