What is the forum consensus on why threaded sprinkler piping is reamed. I
always did it as a fitter. We have always required it in our specifications.
I have never really thought about the ‘why’ though. Is it as simple as
removing the burr created when the pipe is cut and any potential ‘Klingons’
that might get sent downstream to a discharge device OR is this the proverbial
“It’s always been done this way”? The excerpts included below are what I could
find on it with bolding added by me.
I’m not seeing where reaming is necessary for sprinkler piping.
NFPA 13 (2016) Section 6.5.1.1 states:
All threaded pipe and fittings shall have threads cut to ASME
B1.20.1, Pipe Threads, General Purpose (Inch).
ASTM A135-09 Section 13 – Workmanship, Finish, and Appearance, states the
following:
13.2.3 Ends, Threaded Pipe—Each end of threaded pipe shall be reamed to remove
all burrs. All threads shall be in accordance with the American National
Standard Pipe Threads (Note 6) and cut so as to make a tight joint when the
pipe is tested at the mill to the specified internal hydrostatic pressure…
NOTE 6—A complete description of the American National Standard Pipe Threads
applicable to pipe, valves, and fittings is contained in ASME B1.20.1...
ASTM A53-10 Section 11 – End Finish:
11.2 If ordered with threaded ends, the pipe ends shall be provided with a
thread in accordance with the gaging practice and tolerances of ANSI B1.20.1…
Reaming is not mentioned.
ASME B1.20.1-13 – Pipe Threads, General Purpose (Inch), does not mention
reaming pipe. Figure 3 and Table 2 do not show a reamed edge of the male end
of the threaded pipe.
The following are the only ASTM or ASME pipe standard references I can find
requiring reaming of pipe:
ASTM B0828-16 – Standard Practice for Making Capillary Joints by Soldering of
Copper and Copper Alloy Tubing:
6.2 Reaming:
6.2.1 Ream all cut tube ends to the full inside diameter of the tube to remove
the small burr created by the cutting operation. Failure to remove this rough
edge by reaming is a leading cause of erosion-corrosion that occurs as a result
of local turbulence and increased local flow velocity in the tube. A properly
reamed piece of tube provides a smooth surface for better flow.
ASTM A589-06(12) – Standard Specification for Seamless and Welded Carbon Steel
Water-Well Pipe – This does not apply.
Thoughts?
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