A rectangular waveguide has a cross section such that twisting or bending does not distort the internal cross section, lips being provided at each corner of the waveguide and the wall sections being shaped such that when viewed from a shorter side each corner has a portion with a substantially T-shaped section, and while viewed from a long side each corner has a pronounced asymmetric T-shaped section.
A water-cooled skid pipe suitable for supporting metal shapes such as billets, blooms and slabs in a metallurgical reheat furnace. The skid pipe has a base member, a pair of upwardly extending, converging side members and an apex member connecting the uppermost portions of the side members, all such members defining a passageway therethrough suitable for conducting a fluid. A pair of shoulders extend outwardly of the junction of each side member and the apex member, which shoulders and apex member receive the slag which is deposited by the metal shapes onto the skid pipe and prevent the slag from migrating into the seam between the skid pipe and a surrounding insulator. The shoulders further protect any suitable insulator, which can be applied around the base member and converging side members, from direct contact by the metal shape thereby substantially minimizing the impact of the metal shape upon the insulator. The metal shape can be supported directly by the apex member or by a skid member secured atop the apex member. The invention can be used outside a furnace as an improved structural support member.
A round circular hose has a tendency to kink when extended. Also, a round circular hose can be difficult to form into a coil. With this background I have developed a hose with rigid sides to prevent kinking and for ease for forming into a coil provided with thicker wall sections.
