The amount of pounds of steam per hour produced by a firetube boiler?

the boiler has 1783 square feet of heating surface and 2 safety vales with a maximum capacity of 6942 pounds per hour of pressure
Update: The boiler has 1783 square foot of heating surface.
Its a firetube boiler, and I need to know how many pounds per hour of steam production from this boiler
Update 2: its a gas, firetube low pressure boiler, 15 psi maximum allowable working pressure, it has 1783 square foot of heating surface.

I need to know how many pounds of steam per hour this boiler produces
Update 3: Gas Low pressure firetube boiler, 1783 square foot of heating surface, 15 psi MAWP, it operates at around a maximum of 5 to 7 psi. What is the pounds per hour of steam production on this boiler??
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