I drilled the wrong hole, what should I do?
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The equipment is quite small; the cylinder consists of a pipe with a diameter of 168 mm, and its length is 2600 mm. There is a hole with a diameter of 23 mm drilled in the middle part. Please give some advice on how to address this issue Equipment, design pressure 2.0 MP
Fill it in, then do an RT test, and that’s it; it’s not complicated.
At a pressure of 2.0 MPa, the hole can be ground and then rewelded.
It can be repaired by welding and grinding the hole, or a backup hole can be created to cover it.
For the spare hole, we still need the customer’s approval; therefore, it’s better to fill it in. But this is a heat exchanger, and baffle plates need to be installed inside the cylinder. How can we make the inner surface smooth after welding it back together?
Weld a short inner-threaded tube inside, and then seal it with a bolt... A slight protrusion makes the inside surface uneven, but a slight indentation shouldn’t cause much of a problem
Ha, a heat exchanger, right. It’s so small; just cut it off and add a section of cylinder, and that’s it. Other methods are troublesome
Seek customer feedback, cover the misaligned hole locations with blind plates, and drill new holes.
Plug it with a plug and weld it in place; it’s acceptable once the welding inspection is passed.