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Assuming the following typical conditions:

  • natural gas manifold pressure is 3.5" w.c.
  • propane manifold pressure is 10" w.c.
  • natural gas and propane specific gravities are 0.6 and 1.52 relative to air
  • natural gas and propane energies per cubic foot are 1038 and 2516 BTU
  • your orifice coefficients are the same

then the propane orifice diameter should be 0.623 times the natural gas orifice diameter.

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12y ago

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