LP-Gas Systems
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DIPLOMAT
7•198
LP-Gas Tanks and Cylinders:
Tanks are built to American Society of Mechanical Engineers (AMSE)
Code. The cylinders are built to DOT (Department of Transportation) Code.
The major difference between cylinders and tanks is in required testing and
inspection procedures and in the construction of the containers. Both tanks and
cylinders are required to undergo pressure testing and inspections; however, the
procedures for how they are tested and inspected differ.
The difference between the two codes are that the valves, fittings and brack-
ets are located only on the ends of the DOT cylinders; however, on the ASME
tanks they may be located on ends, as well as the sides. There is also a differ-
ence in how the tanks are rated. Required tank ratings are in gallons (ASME
ratings) or pounds (DOT) water capacity. The Federal DOT (Department of
Transportation) regulations require periodic inspections and re-qualifications of
cylinders.
American Society of Mechanical Engineers (AMSE) tanks or bulk containers
are generally used in the motorhomes and motorized products. These tanks
are permanently mounted on to the unit.
An alloy steel two-piece welded and brazed tank is used on all towable prod-
ucts. The marking on the collar DOT 4BA240 identifies the DOT specifications and
service pressure. Other pertinent information included on the collar is the
water capacity (WC) and the tare weight (TW), both which are measured in
pounds, and the Manufacture date (one of the most important items). There is a
required 12 year re-qualification. The final piece of information is for the Dip
Tube (DT) length. This is part of the overfill protection and maximum liquid
allowance in the cylinder.
Maintenance and Safety Tips for the LP-Gas Refrigerator and the
Propane Furnace:
• Have the refrigerator, furnace and venting inspected annually by an
authorized service center.
• Before firing up the refrigerator, or using the propane gas furnace
for the first time each season, have the venting system checked for
blockage. Insects may have built nests that will obstruct flow.
• At the first indication of incomplete combustion (yellow flame
instead of a blue flame or soot is present) contact a service technician
immediately. Improper combustion can cause carbon monoxide
buildup, which is potentially fatal!
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