Large Valve Single Device Isolation Problems & Solutions

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Crack % % Cracked Welds vs. <strong>Valve</strong> Age Graph 3 - Crack % vs <strong>Valve</strong> Age 100 80 60 40 20 0 1920 1930 1940 1950 1960 Year
Preliminary Observation • Cast valves built between 1928 and 1960, with welded-in cover plates, may have cracks in more than 40% of the cover plate welds.
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: Crack % % Cracked Welds vs. Valve D
Page 17 and 18: How To Fix The Crack!
Page 19 and 20: 13 Ft. Dia. Butterfly Valve
Page 21 and 22: Cover Plate Weld Conclusions • Ca
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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