1/2 or 3/4 inch gas pipe

[rhinosaw]

Ok DP, I get your drift

 

[ianmcd]

MI is Male Iron
OD is outside diameter

I always thought MI stood for Malleable iron when talking about iron pipe and fittings

 

[JimCrow]

I always thought MI stood for Malleable iron when talking about pipe

 

[rhinosaw]

Assuming that it's 3/4 inch I presume that it could be used to replace a 15mm feed into a 12kw new boiler, the diameter would be slightly less than 22mm but should be ok?

 

[durhamplumber]

I always thought MI stood for Malleable iron when talking about iron pipe and fittings

Is one not allowed to call it black iron now?

 

[oldbutnotdead]

As long as it isn't a stupidly long run with lots of bends then the pressure drop should be OK- BUT it's buried in a wall, has it been live all these years, is it rusted to whatever somewhere inaccessible- personally I'd have a nice new copper feed put in for the gas with the boiler.

 

[rhinosaw]

Wise words OBND, but I was trying to avoid a new pipe run. 12 mtres from meter just outside front door to kitchen where the 15mm boiler pipe and the one in the picture are located.

 

[oldbutnotdead]

Mmm. End of the day it'll be up to whoever fits the boiler. Kitchen floor is (presumably) solid, have you got any access under floorboards ground or 1st floor?

 

[hard-work]

Circumference ? Pi r squared .

Oh my God!
It is Pi x D
Pi is 3.1415
D is the diameter.
example:
diameter is 20.
3.1415 x 20 = 62.83
circumference is 62.83