The FMS275/375 is a hydraulic operated power slip which is equipped with replaceable slips and insert carriers to handle casing. The power down force generated allows the FMS to take the torque reaction of the tong when the string weight is not sufﬁcient to resist rotating and eliminates the need for a manual casing tong. The powered down slips allow the ﬁrst casing joints to be run in with the FMS.
The FMS is mounted ﬂush with the rig ﬂoor, allowing the casing connection height to be lowered 1 meter (3 feet), thus eliminating the need for scaffolding. The rig crew also has more room to work by removing the spider body from the top of the rig ﬂoor.
The FMS can be used in combination with the rotary support table. The slips will set or raise when a command is given by the driller. Setting and raising slips of the FMS is remote controlled. By detecting the signal-line pressure from the FMS it is determined that the FMS slips are set.
The FMS is available in 2 sizes; the FMS275 ( 2.3/8" - 7.5/8", 250sTon) and the FMS375 (4.1/2" - 14", 500sTon). The NOV FMS275 utilizes the full range of slip assemblies and bottom guides, 23/8" to 75/8", as used in the existing BJ type 250sTon elevator/spider. In addition, special designated slips will give the FMS275 its maximum 250sTon capacity.
The FMS375 utilizes the full range of slip assemblies and guides, 41/2" to 14", as used in the 500sTon elevator/spider. The FMS375 is provided with standard rotary locks in case the rotary torque needs to be transmitted to the casing str