Pipe threading tear-out

Published by: cfz 2009-01-07

a novel George Orwell::
was tempted to tear out the spoiled pages and abandon the enter- prise altogether. would inform you with quiet pride, between whiffs of his pipe,
http://vidyaonline.org/arvindgupta/orwell1984.pdfHOME

I am threading black pipe for natural gas. I am threading the pipe to about 1". Halfway into the thread, the theads are tearing off. I am using a Rigid ratchet pipe threader with 3/4" pipe die.

Using oil. I tried backing the threader out to remove burrs etc. No change. Any suggestions?

Hi all:
I am experiencing a similar problem with 1-1/4" pipe threading. I am using a power threader to add a section of sprinkler in my plant. I have brand new dies and of the 20 or so thread cuts I have made, NONE of them came out cleanly. I have Wheatland pipe so I guess Mexican steel can't be blamed. The only thing I can think of is the lube oil. I use whatever is around including tapping fluid for steel, nothing is any better or worse as far as I can tell. On my last threading, the dies grabbed and cracked the pipe and the machine twisted the pipe end almost to a figure 8. I was lucky to let go in time. Concerned about pressurizizng this system? You bet!

A Year Amongst the Persians: From Teheran to Isfahan::
who have recently been confined, and tries to tear out and devour their livers. as salt- cellars, lamps, pitchers, pipe-bowls, beads, and button-like amulets
http://bahai-library.org/books/ayatp/ayatp.07.htmlHOME

Nineteen-Eighty-Four::
initial act of opening the diary, but for a moment he was tempted to tear out angle-joint of the pipe. human hair that had blocked up the pipe.
http://www.bibliotecapleyades.net/archivos_pdf/1984.pdfHOME

Enzo,

What machine are you using to thread? The 300 Power Drive with an 811 die head? Not trying to sound like a salesman (I'm not), but the lubrication really does make a difference. Using Nuclear and new RIDGID dies should result in an absolutely smooth finish. Make sure you are applying plenty of oil. Also make sure your dies are adjusted properly. Your description of collapsing the pipe sounds like an undersize thread, which results in cutting too deep. Adjustment and proper oil makes a world of difference.

Steve

Enzo,

Don't try setting the dies using a threaded pipe of unknown accuracy. Lay your die head on a table, loosen the cover plate screws about 1/4 to 1/8 turn, enough that the dies all just move freely back and forth. Then, holding all four dies outward against the stop, re-tighten the cover plate.

A Succesful Mix of Water and Wood, by Bob and Jacquie Goad::
through from the top side, as breaking through could tear off the bulkhead while threading it, so I screw the overflow pipe into it before installing.
http://www.aquarticles.com/articles/management/Goad_Build_An_Aquarium.htmlHOME

Look your dies over carefully. with the punishment they've been through, you might have chipped a tooth. It will still work with a chipped tooth, but not as well as new. The Hercules oil should give you much better threads than you were getting with the shop oil. (Of course, Nuclear would be better! ;) )

Hope this helps,
Steve

I am using a Rigid 700 series system for the sprinkler job. I had to take apart the die head to remove it from the collapsed pipe and reassembled it using the threaded end of my purchased (Wheatland pipe) as per the directions on the package. I also made the trip to our local distributor and bought some Hercules cutting fluid and made a go at it. I have much less gouging but the threads at the beginning are much cleaner than the later ones, so perhaps chip buildup or die adjustment could be improved. How tight should the dies be on the threaded pipe used to set them be? I was setting it closed enough to thread on and off the die by hand, but could have been looser. Thanks for the feedback.

Hi
I think your porblem is more likely with the pipe, I am having a similar problem with 1-1/4" dies. We are threading 1-2" pipe with hand dies, the dies are new the oil is new and the pipe is new and in good condition. The only size that will not thread properly is the 1-1/4" and the damage seems to come when we attempt to remove the die, the cutting process is creating a lot of small chips of metal which are binding in the dies. If you spend a considerable amount of time working the die back and forth carefully and pry the particles out and flush with oil the die will back off without damaging the threads but not each time.

The pipe we have is 1-1/4' Sch #40 ERW ASTM A53 GA 21 and Heat #27433, Made in Mexico!! Can't tell which company makes the pipe but it seems to be a batch problem??
If any one else is having problems with this type of pipe, please let me know.

Rob

is your oil new if not try new oil and then mybe new dies jeff

Your using cutting oil right? Motor oil or WD40 dosnt work :rolleyes:

It sounds like your dies may be worn and will need to be replaced. I usually get tearing on threads after several hundred cuts with a 700 power drive but hand threading is more severe becuase of the interrupted cut with each ratchet stroke. Some off shore pipe also creates problems, I use Wheatland or Sawhill made in USA.