Ask Steve: FAQs about SIGMA’s new Re-rounding feature

Below we’ve answered the top questions relating to the installation of our new re-rounding feature. We hope you find these answers useful. If you have additional questions, please contact We will be showing a sample of this re-rounding feature at ACE22, so be sure to swing by booth 14601 to see what’s new and exciting from SIGMA.

Q:  What do I do with the jacking bolts after the re-rounding feature has been installed on a pipe?

A:  SIGMA recommends loosening the bolts and continuing with the assembly. You can leave the bolts in place. If you opt to remove the bolts after loosening them and installing the re-rounding feature this will not affect the integrity of the bolts.

Q:  How do I measure the pipe to estimate how fare out of round it is?

A:  Measure the pipe from 12 o’clock to 6 o’clock and 9 o’clock to 3 o’clock. This will determine exactly where the ‘out-of-roundness’ has occurred.

Q:  How do I know when the jacking bolts are in the right position?

A:  The correct positioning ins based on the irregularity of the diameter. For example, if you determined that the pipe was out of round at 3 o’clock and 9 o’clock, then you would position the bolts at 12 o’clock and  6 o’clock. Position the bolts at the opposite points to where the pipe is out of round.

Q:  Do you have to break off the re-rounding bolts?

A: These bolts DO NOT have a break-off top. After the pipe is back to round, either loosen and leave the bolts in place or loosen and remove them.

Q:  How many people and what equipment is needed to install the re-rounding feature?

A:  We recommend that two people use torque wrenches to install our re-rounding feature on large diameter pipes.