DRILLING RISER FLANGES AND ASSEMBLIES WITH CONTOURED BEARING SURFACES TO REDUCE SHEAR IN CONNECTORS
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United States of America Patent
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Issued Date -
Jun 22, 2017
app pub date -
Mar 24, 2015
filing date -
Mar 24, 2014
priority date (Note) -
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Abstract
This disclosure includes riser flange assemblies and related methods. Some assemblies include first and second flanges each defining a plurality of counterbored bolt holes and having a plurality of concave bearing surfaces each disposed around one of the counterbored bolt holes, a plurality of bolts each having a head and a male threaded portion, a plurality of washers each having a convex bearing surface configured to correspond to the concave bearing surface of a bolt hole when one of the bolts extends through the washer and the bolt hole and a plurality of nuts each having a convex bearing surface and a female threaded portion configured to receive the male threaded portion of one of the bolts, the convex bearing surface configured to correspond to the concave bearing surface of a bolt hole when one of the bolts extends through the bolt hole and is received in the nut.
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