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ABOUT HUBS AND CLAMPS
Revised: 09/24/2008 Provided links give access to illustrations and/or additional information. To return to this page use your browser back button.
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For Older Cast Steel Clamps For Clamp Hub Connections |
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Prior to 1986 most manufacturers that made clamps, to fit clamp hub connections that utilized API ring gaskets as seal rings, made them from cast steel. Cast steel has a greater likelihood of discontinuities that can cause failure in these products. Today, most clamp manufacturers making clamps to fit API Spec 16A hubs utilize forged steel. When possible, users of older cast steel clamps should inspect them to reasonably assure their continued safe use. See photograph below for an example of a cast steel swing bolt clamp.
WOODCO USA suggests the following as a minimum inspection routine. Perform a Brinell hardness test on each clamp half to assure the material has tensile strength at least equal with that required by API Spec 16A for the hubs the clamp connects. Further inspection requires a through cleaning by blasting or brushing, removing all dirt, rust, paint, and scale. Next perform a visual inspection for obvious corrosion damage, cracks, etc. and if the clamp appears OK 1 perform a 100% magnetic particle inspection using acceptance criteria as shown in API Spec 16A. Evaluate bolting to the same criteria as used for flange bolting, and replace if questionable 1. Replace any missing or damaged 1 washers. These inspections may reasonably assure safety 1 when using older clamps. Before making any assembly of pressure control equipment using cast steel clamps, conduct a pressure test on the clamp before use. For a table of Clamp Test Pressures and Applied Loads Click Here.
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chance to help. WOODCO USA provides Web Site Tools for identification, estimating, and reference only. Do not use this information for manufacturing or inspection. Users of these tools should not use them as a substitute for professional engineering advice. Anyone making use of the information presented does so at his own risk and assumes any and all liability resulting from such use. FOR FURTHER INFORMATION, OR TO LEARN MORE ABOUT WOODCO USA PRODUCTS AND SERVICES, CONTACT: WOODCO USA |
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