LP and MAP ???

Is it safe to burn map gas instead of lp???

The short answer is: Not without a lot of investment in testing, and not in a certificated aircraft without violating Federal regulations.

The typical burner certification uses over 50,000 gallons of propane. If your bank account could support the use of 50,000 gallons of MAPP, perhaps you could develop some durability data on your burner. I don't know what its vaporization characteristics are, but it burns at a higher temperature than propane in a torch designed to burn it.

The radiant heat output could be a problem.

You would need to thoroughly investigate the properties of MAPP.

Here is OSHA's take on it:

1. Question. In the context of OSHA safety standards and regulations is MAPP gas considered an LPG? Answer. No. This is based on the definition of Liquefied Petroleum Gas as defined in 29 CFR 1926.155(j) and the definition of Methylacetylene-Propadiene, Stabilized, as defined in NFPA No. 51-1969.

FAR part 31 was changed over three years ago to simplify burner certification. It no longer takes 50,000 gals of propane to make it certified. Here is amendment seven to FAR part 31:

(1) The test program for the main blast valve operation of the burner must include: (i) Five hours at the maximum fuel pressure for which approval is sought, with a burn time for each one minute cycle of three to ten seconds. The burn time must be established so that each burner is subjected to the maximum thermal shock for temperature affected elements; (ii) Seven and one-half hours at an intermediate fuel pressure, with a burn time for each one minute cycle of three to ten seconds. An intermediate fuel pressure is 40 to 60 percent of the range between the maximum fuel pressure referenced in paragraph (d)(1)(i) of this section and minimum fuel pressure referenced in paragraph (d)(1)(iii); (iii) Six hours and fifteen minutes at the minimum fuel pressure for which approval is sought, with a burn time for each one minute cycle of three to ten seconds; (iv) Fifteen minutes of operation on vapor, with a burn time for each one minute cycle of at least 30 seconds; and (v) Fifteen hours of normal flight operation. (2) The test program for the secondary or backup operation of the burner must include six hours of operation with a burn time for each five minute cycle of one minute at an intermediate fuel pressure. (e) The test must also include at least three flameouts and restarts. (f) Each element of the system must be serviceable at the end of the test.

IN short it more closely reflects actual service. And can be done on a lot less propane. (or MAPP gas, should somebody make the effort to