We're designing a bulkhead (58' wide x 30' tall) for a large volume, low pressure Howden mine fan. The operating pressure for this fan is less than 1 inch of H20 (5.2 psf). The customer doesn't have any information on blasting pressures unfortunately. Obviously I need to talk with the customer and try to sort this out, but in the meantime, does anyone know if MSHA has a minimum blast pressure requirement? I would think that blast pressure would govern over this minimal fan pressure.
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