Abstract: An assembly includes two tubular elements, a primary and a secondary seal arranged between the two tubular elements, a seal cavity formed between the two tubular elements and the primary and the secondary seal, and a seal monitoring apparatus having a housing and a position sensor. The housing has a chamber enclosing a separator which divides the chamber into a first and a second sub-chamber. The first sub-chamber is fluidly connected to the seal cavity and is filled with a hydraulic fluid. The separator is movable in a first direction relative to the housing to increase a volume of the first sub-chamber and decrease a volume of the second sub-chamber, and in a second direction to decrease the volume of the first sub-chamber and increase the volume of the second sub-chamber. The position sensor generates an electrical signal which represents a position of the separator relative to the housing.

Abstract: An assembly includes two tubular elements, a primary and a secondary seal arranged between the two tubular elements, a seal cavity formed between the two tubular elements and the primary and the secondary seal, and a seal monitoring apparatus having a housing and a position sensor. The housing has a chamber enclosing a separator which divides the chamber into a first and a second sub-chamber. The first sub-chamber is fluidly connected to the seal cavity and is filled with a hydraulic fluid. The separator is movable in a first direction relative to the housing to increase a volume of the first sub-chamber and decrease a volume of the second sub-chamber, and in a second direction to decrease the volume of the first sub-chamber and increase the volume of the second sub-chamber. The position sensor generates an electrical signal which represents a position of the separator relative to the housing.

Abstract: A wellhead arrangement includes a valve tree arranged on a wellhead and a seal carrier with at least one seal. The valve tree includes an isolation sleeve. The seal carrier is arranged between the wellhead and the isolation sleeve.

Abstract: A method of monitoring a condition of a connection between two bodies which are connected using a connector. The connector has a sensor assembly which provides an output representing a degree of movement of one or both of the two bodies. The method includes installing the connector and the two bodies in a use position in which the connector joins the two bodies, and using the output from the sensor assembly and a numerical model to determine a force on one or both of the two bodies or of the condition of the connector. The numerical model is a record of test forces applied to a test element secured to the connector or of a test connector having a same configuration as the connector and a corresponding output from the sensor assembly of the connector or of the test connector during and/or after the application of each test force.

Abstract: A wellhead arrangement includes a valve tree arranged on a wellhead and a seal carrier with at least one seal. The valve tree includes an isolation sleeve. The seal carrier is arranged between the wellhead and the isolation sleeve.