CPVC hangers

[fpst]

For CPVC piping, in NFPA 13 2013 which allows cumulative sprinkler hanger distances, I can't find a maximum unsupported length.

"9.2.3.2.5* A single section of pipe shall not require a hanger when the cumulative distance
between hangers on the branch line does not exceed the spacing required by Table 9.2.2.1(a)
and Table 9.2.2.1(b)."

In the blazemaster listing (for example) I see a section about vertical support of sprinkler piping - the vertical support can be on two sides of every sprinkler/sprinkler drop or directly before a sprinkler/sprinkler drop. The dimensions given for "one support" is 1'-0 for 1" CPVC, for example.

I'm trying to determine three things:

1. Can this "vertical support", if it's something like a standoff hanger, be counted as a support not only against upward thrust, but also as a pipe hanger (keeping it suspended when sprinkler is not active) itself. I suspect the answer is yes so my next questions are:

2. If you have a 1" blazemaster CPVC pipe going to a sprinkler, what is the maximum distance the centerline of the sprinkler can be from the nearest hanger.

3. Can the hanger be on the CPVC cross main?

I've read the listing/NFPA 13 2013, just want to verify I'm interpreting it right.

 

[fpst]

After more research it appears 1. yes if the listing says it can be used as a restraint and a hanger (some do)
2. 1'-0
3. Not unless the hanger on the cross main is less than 1'-0 (linear) from the sprinkler or sprinkler drop, assuming the arm over is 1" blazemaster.