Bambie
Electrical
- Mar 31, 2012
- 242
At my plant, peening is used to temporarily stop leaks on pressurized metal items.
This includes the following applications:
- closing through-wall cracks & pinholes on pipes
- closing gaps between mating pipe flanges or body/bonnet flanges on valves
- sealing interface gaps between tongue and channel clamps and flanges, and
- closing perimeter seals on bolted sealant injected enclosures.
There is plenty of information on water, laser, UT and shot peening for fatigue enhancement or forming purposes out there, but very little on pneumatic/chisel/hammer peening on pressurized items.
Leak Stopping Service providers that I have approached appear to consider this practice to be a trade secret.
Has anyone encountered guidelines (besides EPRI NP-6523-D) with specific constraints for extent of peening based on materials and applications with a focus on worker safety?
This includes the following applications:
- closing through-wall cracks & pinholes on pipes
- closing gaps between mating pipe flanges or body/bonnet flanges on valves
- sealing interface gaps between tongue and channel clamps and flanges, and
- closing perimeter seals on bolted sealant injected enclosures.
There is plenty of information on water, laser, UT and shot peening for fatigue enhancement or forming purposes out there, but very little on pneumatic/chisel/hammer peening on pressurized items.
Leak Stopping Service providers that I have approached appear to consider this practice to be a trade secret.
Has anyone encountered guidelines (besides EPRI NP-6523-D) with specific constraints for extent of peening based on materials and applications with a focus on worker safety?
