formula

Brad White_200

At sea level, atmospheric pressure (zero on the gauge), there are 970.3 BTUs per pound of steam at saturation. At the same saturation conditions:

At one pound, that drops to about 968 BTUs per lb.

At two pounds, that drops to about 966 BTUs per lb.

At five pounds, that drops to about 960 BTUs per lb. For low pressure radiator heating, this 960 number is often used for rough purposes, just a wee bit conservative. It also corresponds to the "four square feet of EDR per pound of steam" rule of thumb.

No real conversion, just tables.

Now, if you have a load of say, 10,000 BTUs per hour, you would need a steam radiator of about 42 EDR and this would require about 10.5 lbs. per hour to serve it.

Bart_8

formula

Can you tell me how to convert btu's to pounds of steam per hour?? Thanks

Bart_8

I need to add 696 pounds of steam, of relief valve to a system. I have a 1" valve that is rated for 15 psi and 770,000 btus.How many pounds of steam is this relief valve worth?
Hence my question as to converting btus to pounds of steam.

Brad White_200

Make sure that

it is a steam-rated valve and not HW. I am assuming it is steam based on the 15 lbs. rating though.

I would ask your valve supplier and manufacturer for the specific duty of the valve you are using, also if it is ASME and National Board rated.