Unsupported length from end sprinkler and the last hanger
Unsupported length from end sprinkler and the last hanger
(OP)
I am not sure of the answer to this question. 9.2.3.4.1 states; the unsupported length between the end sprinkler and the last hanger on the line...
Does that mean that the 2'-0" drop must be added to the 4'-0" for a total length? If so, the branch line is 1 ½", but the drop is 1". What size pipe for unsupported measurement should be used?
Does that mean that the 2'-0" drop must be added to the 4'-0" for a total length? If so, the branch line is 1 ½", but the drop is 1". What size pipe for unsupported measurement should be used?





RE: Unsupported length from end sprinkler and the last hanger
NFPA 13 2010 9.2.3.4.1 The unsupported HORIZONTAL length between the end sprinkler and the last hanger on the line shall not be greater than...
RE: Unsupported length from end sprinkler and the last hanger
RE: Unsupported length from end sprinkler and the last hanger
(I believe this is for arm overs)
One is that if the water pressure is less than 100 psi you are allowed to be 2'-0 away from the sprinkler and hanger
If water pressure is over 100 psi you need to be within 1'-0 from the head and the hanger
I will read NFPA 13 for the distance on branches
RE: Unsupported length from end sprinkler and the last hanger
9.2.3.5.1 is what you're looking for
The cumulative horizontal length of an unsupported armover to a sprinkler, sprinkler drop, or sprig, shall not exceed 24 in. for steel pipe or 12 in. for copper tube.
This is for pressures not exceeding 100 psi.
RE: Unsupported length from end sprinkler and the last hanger