C-21 Casing Hangers

Sentry C-21 casing hangers are the non-automatic solution for hanging casing. The split bowl utilizes the same upper slip segments as the C-22 and C-29 hangers and incorporates a separate seal assembly. This has two benefits. It prevents any well or test pressure from adding to the radial compression of the slip segments. And it is a primary casing seal that can be replaced during workover operations without picking up the pipe.

• Non Automatic casing hangers are typically used when the casing string weight is not sufficient enough to energize the seal mechanism in automatic casing hangers
• The Type-H seal ring utilizes S (OD) and CS (ID) seals to provide the primary seal on the string of casing being suspended in the casing hanger
• The C-21 casing hanger seal mechanism cannot be used if LDS are present in the upper flange of the casing head