I'm converting a natural gas salamander-type heater (150,000 BTU/hr) to propane. The current NG version has a regulator in it, while the equivalent LP version (from the same manufacturer) does not. The simplest way to convert this opne is to leave the regulator (it's a 1/2 PSIG input, 3"-6" adjustable output gas regulator) in there so I don't have to add a length of pipe, and to use a standard high flow, low pressure LP gas regulator (11") to supply it. The orifices in the NG version are 10 #40 radial holes. What I want is a place to start with an equivalent hole size for LP gas. I haven't yet looked up the chemistry of propane to try and work out what an equivalent stochiometric flow should be, nor the physics (viscosity and density) to see what I should expect for flow rates. Since the inlet LP pressure to the orifices will be the same as the current NG inlet pressure, I can't work it out from the usual tables. Any of you guys know a simpler way to approach this? Thanks.
- posted
18 years ago