A vortex-induced vibration (VIV) strake arrangement is provided. The VIV strake arrangement comprises: a VIV strake shell for location on a conduit; and a VIV strake fin, for coupling to the VIV strake shell, comprising a flexible fin tip, a flexible first leg extending from the flexible fin tip and a flexible second leg extending from the flexible fin tip, wherein the VIV strake fin is shaped such that when the VIV strake fin is connected to the VIV strake shell and the VIV strake shell is located on the conduit, the flexible first and second legs extend from the flexible fin tip and define a void between the flexible first and second legs.

The present invention provides a spacer (11) and a spacer segment (13). One or more spacer segments (13) form the spacer (11). The one or more spacer segments (13) are adapted to be interconnected and fitted to/on a first surface. The spacer segment (13) comprises a first collar portion (17), a second collar portion (19), and at least one support assembly (15) extending between the first collar portion and the second collar portion. The at least one support assembly is movable from a normal position, wherein no or minimal force is exerted on the support assembly, to a compressed position, wherein the support assembly supports a load or a portion of a load.

A system can include an outer housing, a customized housing, and centralizing elements. The outer housing can define an inner diameter. The customized housing can be positioned approximately concentrically within the outer housing. The customized housing can include slots arranged spaced-apart around an outer diameter of the customized housing. Each slot of the plurality of slots can be sized to receive one or more centralizing elements. The centralizing elements can include the one or more centralizing elements. Each centralizing element can be sized to be positioned in a corresponding slot of the slots and to contact the inner diameter of the outer housing while located in the corresponding slot.

A locator for positioning and/or stabilising a survey apparatus in a borehole comprising: two opposing members for cooperatively coupling together around a survey apparatus, the survey apparatus comprising at least one profiled region for a locator on the survey apparatus, each opposing member comprising: at least a first apparatus coupling, the first 5 apparatus coupling configured to connect to a respective first apparatus coupling of the corresponding opposing member around the survey apparatus, one or more bearing members for bearing against a borehole, and wherein: the at least first apparatus coupling is configured to engage with the at least one profiled region on the survey apparatus to, when one opposing member is cooperatively coupled with the corresponding opposing member 0 around the survey apparatus, constrain the resultant locator on the survey apparatus longitudinally and/or rotationally.

A shank adapter, rock drilling machine and method of mounting a shank adapter of a rock drilling machine inside a slide bearing element. The shank adapter includes a coupling head and a rotation portion at its opposite ends, and a flushing portion located therebetween. Outer diameters of the coupling head and the rotation portion are both greater than outer diameters of portions of the shank adaptor located therebetween.

A system can include an outer housing, a customized housing, and centralizing elements. The outer housing can define an inner diameter. The customized housing can be positioned approximately concentrically within the outer housing. The customized housing can include slots arranged spaced-apart around an outer diameter of the customized housing. Each slot of the plurality of slots can be sized to receive one or more centralizing elements. The centralizing elements can include the one or more centralizing elements. Each centralizing element can be sized to be positioned in a corresponding slot of the slots and to contact the inner diameter of the outer housing while located in the corresponding slot.