1/2 or 3/4 black pipe?

[northeimcustom]

i have 3/4'' direct barial 3/4'' with risers on each end from meter by the house to back of my garage. lets call this 45'. from where it enters my garage on the inside i would like to have it branch into 2. one 'leg' for a future outdoor grill (60k btu). that part would be maximum of 8'.

question #1: should this be 1/2'' or 3/4'' black pipe? mind you that this will be a future project that i would just cap off for now where it branches off.

the other 'leg' will run about 10' up the wall to attic, jog over about 22' then back down 2' feet lets say to the mr heater (50k btu). lets call this 'leg' about 34'. the mr heater has 1/2'' fitting.

question #2: Should 'leg' #2 to the heater be 1/2'' or 3/4'' black pipe?


thanks guys!

 

[LS6 Tommy]

It all depends on the total run length & pressure drop. A 40' run of 1/2" with a of .5" WC pressure drop has a capacity of around 60 cfh, or 60 MBH.
The grill is a no brainer at 8'- use 1/2". The unit heater line is under 40', so you can safely get away with1/2" there too.


Tommy

 

[rlitman]

It sounds to me like you have the sizes right, and can tee off the 3/4" to 1/2" in both directions.

 

[BD1]

Very little difference in price I would use all 3/4''. Not knowing where your 3/4 ties into in relationship to your gas meter location , 3/4'' would be much safe.

 

[northeimcustom]

Ok, thanks guys. The 3/4 ties into the meter about 4" after the meter, so I feel i am good there

 

[big.jim]

i would go 3/4 all the way for the little price difference, bigger is always better plus would allow for any upgrading in the future

 

[Jackfre]

i would go 3/4 all the way for the little price difference, bigger is always better plus would allow for any upgrading in the future

...and when you need a coupling or 90 use a tee and cap off the unused end. It makes it much easier to move appliances or add later

 

[Bobdog]

I'd go with 3/4" for that, myself.

 

[zmaxmotorsports]

i would go 3/4 all the way for the little price difference, bigger is always better plus would allow for any upgrading in the future

 

[northeimcustom]

I've decided to go with the 3/4. Thanks for the helps guys.