Abstract: A system of flexible conduit and fittings useful particularly, though not exclusively, for conveying, supporting and connecting electrical service cables and wires. The system includes a corrugated, synthetic resin conduit which is flexible and mechanically strong, connector sleeves for clampingly engaging sections of the corrugated conduit in end-to-end relation, and hanger sleeves for clampingly engaging the conduit and suspending it from a wall or similar surface. A novel electrical outlet box is provided and includes internally toothed conduit-receiving inlet fittings for securely engaging an end of the conduits in inlets to the box.

Abstract: The present invention is directed to swivel means for use in connecting pairs of axially spaced risers in an off-shore multi-line riser system the conveys petroleum from a collection point on the ocean floor to a floating buoy for delivery to tankers. The swivel permits considerable latitude in the movement of the riser system yet assuring leak proof joints at the points of movement by providing elastic seals that facilitate motion between conveying conduits.

Abstract: A metal chimney comprised of prefabricated double-walled sections packed with compressible mineral fiber insulation material between the inner and outer metal walls. Each section has a male end and a female end constructed so that a plurality of sections can be interconnected together end-to-end and will maintain structural integrity while also reducing heat conductivity and gas leakage from the inner wall to the outer wall. The female end of each section has a flexible, diaphragm like insulation retainer and seal, while the male end utilizes a rigid spider comprised of spaced apart spoke portions between inner and outer walls in combination with an annular wafer of thin nonmetallic sheet material. After installation, the flexible diaphragm seal is compressed against the rigid spider and annular wafer allowing the insulation to form a gas seal, which is maintained even if these wafers or diaphragm seals are consumed by chimney heat.

Abstract: A flexible length of pipe is formed from at least two pipe sections joined by a flexible element such as a closed toroidal shell or open convoluted forms.

Abstract: A pipe clamping assembly is provided with an improved first and second encircling ends on a sheet metal clamping band so as to provide upward and reversely extending end sections each having an inwardly directed flange positioned to extend toward an underlying pipe and act in conjunction with the clamping band to prevent unwanted movement of an underlying sealing gasket under operating conditions of the pipe clamping assembly. In one embodiment, the ends are slotted to allow for adjustment to inexact contours while in another embodiment, the band is unslotted providing greater rigidity for use with pipes of consistently repeatable defined circumference.