LP Safety Inspection: Cost, Hours and Process in Hacienda Heights

Propane at service pressure in an occupied vehicle is the one system on a coach where a mistake is not an inconvenience. That is why LP work is certification gated: it cannot legally be performed by an uncertified technician, and the certification exists because the failure mode is fire or asphyxiation rather than a callback.

What the certification buys you procedurally is method. A leak test on an LP system is not a spray bottle and a look. It is a timed pressure test with a manometer at a specified test pressure, held for a specified interval, with the result recorded, plus a separate operating pressure verification at the regulator under load. A system that holds a static test can still be misregulated, and a misregulated system is what produces yellow flames, sooting and appliances that will not stay lit.

It also buys you correct component selection. Fitting choice, thread sealant selection, hose date compliance and support spacing on LP line are all different from potable water practice, and every one of them is a place an uncertified repair goes wrong invisibly. This is the single strongest argument for asking any shop, including this one, who exactly is touching the propane.

The test begins at the supply. On a motorhome that is the ASME tank, its valves and its mounting. On a towable it is the cylinders, their requalification dates, the overfill protection valves, the collar condition and the mounting and cover. Rubber pigtails and hoses are checked for date, cracking and chalking, because those are consumables and they are frequently decades old on used coaches.

The regulator is next: a two stage regulator is a wear item and ten years is the common replacement point, and its operating pressure is verified under load rather than assumed. The automatic changeover function on a two cylinder system is tested. Then the distribution: a timed static pressure test on the whole system, followed by isolation testing where a drop is present so the leak is localized rather than guessed.

Appliance connections are checked individually at the cooktop, oven, furnace, water heater, refrigerator and any outdoor cooking outlet, along with lock off valve operation. Flue and burner condition is inspected on the appliances that have them, because a sooting flue is a combustion problem that a pressure test will not show. Finally the LP detector is tested and its service life date checked, since those units expire and a great many coaches are running detectors well past date.

• Tank or cylinder condition, valves, requalification date and mounting
• Pigtails and hoses checked for date, cracking and chalking
• Two stage regulator condition, age and operating pressure verified under load
• Automatic changeover tested on two cylinder systems
• Timed static pressure test on the full distribution system with a manometer
• Isolation testing to localize any pressure drop
• Every appliance connection and lock off valve checked individually
• Burner and flue condition inspected for sooting and combustion quality
• LP detector tested and its service life date recorded

Annually is the sensible interval, and it is included in the annual maintenance service on this program rather than sold twice. It should also be done any time the LP system has been opened: after an appliance replacement, after a galley remodel that moved a cooktop, after a regulator change, and after buying a used coach with no record of the system ever having been tested.

The test itself is one to three hours and sits at the low end of the pricing on this site, with a $45 hazmat and disposal fee where LP is involved, per the published rate card. Labor is at the posted mechanical and electrical rate of $260 per hour.

If the test finds a leak, a misregulated system or a failed component, those are repairs. They are quoted separately under LP system service on the systems side of the shop, and they are performed by the same certified technician. What we will not do is hand a coach back with a known LP defect and a note about it. A system that fails the test either gets repaired or the LP gets shut off and tagged before the coach leaves.