inlet pipe size

[steviep]

The wood boiler I had given to me has 2 - .75 pipe inlets . what is 2 - 3/4 pipes equal to in single piping. I know that 3/4 + 3/4 doesn't always equal 1.5. I think the output is 1.25.

 

[Duetech]

1.25' is close enough...Cave2k

 

[kabbott]

To find the area of a circle multiply the diameter times PII (3.1415). .75 x 3.1415=2.356125 x 2 = 4.71225. So if you know the area divide by PII and you will get the diameter i.e. 4.71225/3.1415= 1.5. That is if you believe that sort of thing. If not that's ok! I use 1.25 and 1.5 on my boiler and unless it's real critical 1.25 will probably work. I don't know your system and I'm not an expert...Cave2k

Diameter x Pi = circumference

Radius squared x Pi =area.... .75 diameter= .375 radius (.375x.375)x3.14=.44 x 2 pipes=.88 sq inches.
1 inch pipe (.5x.5)x3.14=.785 sq inches
1.25 inch pipe (.625x.625)x3.14=1.22 sq inches

In reality reducing for a short section right at the boiler will have little effect(within reason).

 

[Duetech]

To find the area of a circle multiply the diameter times PII (3.1415). .75 x 3.1415=2.356125 x 2 = 4.71225. So if you know the area divide by PII and you will get the diameter i.e. 4.71225/3.1415= 1.5. That is if you believe that sort of thing. If not that's ok! I use 1.25 and 1.5 on my boiler and unless it's real critical 1.25 will probably work. I don't know your system and I'm not an expert...Cave2k

Diameter x Pi = circumference

Radius squared x Pi =area.... .75 diameter= .375 radius (.375x.375)x3.14=.44 x 2 pipes=.88 sq inches.
1 inch pipe (.5x.5)x3.14=.785 sq inches
1.25 inch pipe (.625x.625)x3.14=1.22 sq inches

In reality reducing for a short section right at the boiler will have little effect(within reason).

Oops! Wrong formula. Sorry about that. I was thinking surface area and not internal area.