No need for field x-rays to prove joint efficiency. Are designed to pressure requirements - no need to prove joint under difficult field conditions. Therefore, there is no concentrated pipe movement and no need for conventional expansion joints, which require maintenance. Several full circle - ring follower penstock couplings receive a final inspection. Dresser couplings have been used on penstocks world wide.
Segmented coupling is crated and ready for shipment to the job site.
Depending on coupling size, coupling middle rings can be rolled and formed in segments.