Large Valve Single Device Isolation Problems & Solutions

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13 Ft. Dia. Butterfly After Repair
Cover Plate Weld Conclusions • Cast valves may have cracked cover plate welds, • The cracks may result in the cover plates falling out, • Cracked welds pose a potential safety hazard to personnel working behind the closed valve, • The cracks can be detected relatively easily with magnetic particle NDT, • Partial repair of a cracked weld has been problematic, whereas complete replacement of the cover plate and new welding has proven to be completely successful.
Page 1 and 2: Large Valve Single Device Isolation
Page 3 and 4: What is required for SDI Certificat
Page 5 and 6: Typical SDI Valve Problems • Crac
Page 7 and 8: 13 Ft. Dia. Butterfly Valve
Page 9 and 10: Failed plug in a Spherical Valve
Page 11 and 12: Typical Cracked Weld
Page 13 and 14: Crack % % Cracked Welds vs. Valve D
Page 15 and 16: Preliminary Observation • Cast va
Page 17 and 18: How To Fix The Crack!
Page 19: 13 Ft. Dia. Butterfly Valve
Page 23 and 24: Original seal design
Page 25 and 26: New Seals Being Installed
Page 27 and 28: Leakage Through New Seals
Page 29: The End (time to wake up!) Dan Camp

Large Valve Single Device Isolation Problems & Solutions

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