Abstract: An improved mechanism for cushioning shocks imparted to a stationary body from various sizes of vessels, including a resiliently retarded telescoping member having a first movement versus thrust characteristic with a relatively high rate of movement versus thrust over a first predetermined range of thrusts, and an abruptly lower rate of movement versus thrust for thrusts exceeding said first predetermined range.

Abstract: A control line protector clamp having an elastic inner wall with longitudinal slots therein to accommodate and secure control lines comprising a pair of rubber-coated, semicylindrical, skeletal steel frame members hinged together along one of their longitudinal edges and adapted to be releasably closed securely into a generally cylindrical configuration by drive pin fastener means at their opposite longitudinal edges, the frame members each being of lateral, parallel, rib-and-slot construction with a reinforced, generally rectangular, three-walled, longitudinal channel formed in the member with the open side of the channel facing inwardly of the frame and encompassing the slots and with braces spanning the angles formed between the side walls of the channel and the circumference line of the frame members.

Abstract: For use in hydraulic workover operations for oil and gas wells, a snubbing element is provided that is made entirely of polymeric material such as polyurethane. According to a preferred embodiment of the invention, the strength and rigidity supplied to the snubbing element in the prior art metallic support ring is now provided by molding that portion of the polymeric annular snubbing element from a polymeric material having a higher density and hardness than that of the polymeric sealing member. The polymeric annular snubbing element thus comprises a high density polymeric support member and a relatively lower density polymeric sealing member.

Abstract: A rubber composition for use in annular packer elements for blowout preventers is provided which comprises from about 45 to about 55 weight percent of an acrylonitrile-butadiene copolymer; from about 10 to about 15 weight percent of a first admixture further comprising a major amount of colloidal silica and minor effective amounts of coupling agent, curative, lubricant, dispersant, activator and antiscorching agent; from about 30 to about 40 weight percent of a second admixture further comprising a major amount of carbon black and minor effective amounts of a plasticizer, antioxidant and antiozonant; and minor effective amounts of tetraethyl thiuram disulfide and benzothiazyl disulfide.

Abstract: Reinforced polymer compositions comprising a minor effective amount of a particulate metal reinforcing agent are provided. A preferred particulate metal reinforcing agent preferably comprises a plurality of discrete particles, each further comprising nickel, chromium and titanium carbide. Polymer compositions adapted to undergo a color change when subjected to a particular thermal history for a particular time interval are also provided.

Abstract: A shock absorbing bumper system assembly (10) is provided for attachment to an offshore structure (12). Assembly (10) utilizes a vertical column (34) supported from arms (20, 22). An outer protector (38) surrounds the column (34) and is eccentrically positioned relative to the column (34). A pair of resilient ring elements (42, 44) are positioned in an axially spaced relationship, bonded to the column (36), and conform to the annular shape formed between protector (38) and column (36). Resilient connectors (30, 32) may also be used and comprise rings (54), which are similar in construction to the resilient ring elements (42, 44).

Abstract: A shock absorbing boat landing (10) is provided for attachment to a marine structure (14) such as an offshore platform or the like. The system (10) has a landing frame (16) which is supported by two pairs of upper and lower shock cells (22a and 22b). The landing frame (16) is pivotally coupled at (40 and 42) to the operative arms (26) of the shock element so that relative rotation between the operative arm (26) of the shock cells and the frame (16) can occur about a vertically extending axis whereby improved shock absorbing characteristics can be obtained.

Abstract: A shock absorbing bumper system assembly (10) is provided for attachment to a structural member (12) of an offshore platform. The assembly (10) utilizes a vertical column (34) supported from arms (20) and (22). An outer protector (32) surrounds the column (34) and is eccentric to the protector. A pair of resilient ring elements (38) and (40) are positioned in an axially spaced relationship and bonded onto the column (34). The rings (38) and (40) conform to the annular space formed between protector (32) and column (34). Resilient connectors (26) and (28) can be used and comprise rings (44) similar in construction to rings (38) and (40). The system can be fabricated by forming subassemblies (62) comprising rings bonded onto the exterior of short lengths of pipe.