When someone uses vent hole for wedding band, they use a half coupling and a plug (see the attached picture). Someone says it is for venting, even says it is for X-ray inspection. Lot of copycat in the reality!
Vent hole or Tell Tale hole is sweep hole, and often seen in the reinforcement pad or similar structure, such as wedding band, full Encirclement/Reinforcing Saddles and Pipe Repair Sleeves.
The Use of Vent Hole
For pipe line welding. the vent hole serves as a vent during welding for entrapped...
