Cutting with Mapp/Oxy

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For years, I have had a Oxy/Mapp set up. When I bought it (used), the guy who had it said he used Mapp instead of Acetylene because it burned hotter.Over the years I have had the Mapp (2ft tall bottle) filled numerous times and had no issues.Today, I ran out of Mapp and was wondering the following:1. Does Mapp actualy burn hotter than Acety?2. What about Propane instead and would I need a new bottle?3. Which secondary gas will give the hottest and cleanest cut on lets say 1/4" steel?This set up is used strictly for cutting as I have Migs for welding.Thoughts?
Reply:If you run out of MAPP, propane will work just fine with the same tips.Disclaimer; "I am just an a$$hole welder, don't take it personally ."
Reply:like you i have mapp.  i just got back into welding and my mapp bottle is almost empty, kinda curious what everybody has to say.
Reply:Originally Posted by TozziWeldingIf you run out of MAPP, propane will work just fine with the same tips.
Reply:propane hotmapp hotter Acety hottiest
Reply:MAPP gas is a mixture of various hydrocarbons, principally, methylacetylene and propadiene. It produces a relatively hot flame (2,976°C) with a high heat release in the primary flame (inner cone) (15,445kJ/m 3 ), less than for acetylene (18,890kJm 3 ) but much higher than for propane (10,433kJm 3 ). The secondary flame (outer cone) also gives off a high heat release, similar to propane and natural gas. The combination of a lower flame temperature, more distributed heat source and larger gas flows compared with acetylene results in a substantially slower pierce time.Have a Jeep Cherokee?  Click Here!
Reply:Originally Posted by SkwerlyMAPP gas is a mixture of various hydrocarbons, principally, methylacetylene and propadiene. It produces a relatively hot flame (2,976°C) with a high heat release in the primary flame (inner cone) (15,445kJ/m 3 ), less than for acetylene (18,890kJm 3 ) but much higher than for propane (10,433kJm 3 ). The secondary flame (outer cone) also gives off a high heat release, similar to propane and natural gas. The combination of a lower flame temperature, more distributed heat source and larger gas flows compared with acetylene results in a substantially slower pierce time.
Reply:Originally Posted by jh225Problem is that all the new propane tanks (like a 20lb grill tank) have new safety valves and when screwed on, the regulator didn't open the gas hole.
Reply:Originally Posted by 84zmikeHow so?.....I use my 20 lb tank when my 35 is emty...not one problem at all....
Reply:I run a 20 pound OPD grill tank all the time, no problems getting gas to flow.Disclaimer; "I am just an a$$hole welder, don't take it personally ."
Reply:Originally Posted by TozziWeldingI run a 20 pound OPD grill tank all the time, no problems getting gas to flow.
Reply:No welding with LP....lots of different opinions as to why but some are....no gas shielding....the other is slow to get a puddle going....and as for the reg ends....the lp tank does have the outer threads for the plastic reg end like on you grill, but also had the left hand internal threads.....