Large Valve Single Device Isolation Problems & Solutions

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Summary • Cast valves have issues, but they can often be solved at a fraction of the cost of a new valve • Casting hole cover plates can be replaced • New seals can be designed • Corrosion coatings can be renewed
The End (time to wake up!) Dan Campbell, P.Eng. Manager Hydro Projects Klohn Crippen Berger Ltd. 500 - 2955 Virtual Way Vancouver, BC Canada, V5M 4X6 Email: DCampbell@klohn.com
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 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: Leakage Through New Seals

Large Valve Single Device Isolation Problems & Solutions

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