A pipe has an innermost layer, outside of which there is an inner electrode layer, outside of which there is an insulating layer, outside of which there is an outer electrode layer. The innermost layer is made of plastic by continuous extrusion and the insulating layer is made of foamed plastic.

A self-extinguishing pipe is described for use with tobacco or other smoking material. The pipe is made in two parts, a body and an endpiece, and holds a filter internally. The endpiece includes a reservoir for the tobacco or other smoking material at one end which has an adjustable base for changing the depth of the reservoir. The two-part construction and adjustable base facilitate cleaning of the pipe, replacement of the filter, and removal of ash without needing additional tools. The depth o...

The leading end portion of a caulking pawl portion formed in the end portion of a pipe main body is formed integrally with the pipe main body through the side surface portion of the caulking pawl portion which has a larger width in the longitudinal direction thereof than the width of the leading end portion in the longitudinal direction thereof. At the same time, the leading end portion of the caulking pawl portion is also formed integrally with the cap side end of the side surface portion of th...

This invention discloses a flexible pipe suitable for use as a drill string. The construction of the pipe is such that it will withstand high internal and external pressures, will sustain a substantial longitudinal load, and a substantial torque.

A pipe to be used for smoking with a bowl, where the tobacco being smoked is burned, having three cavities or chambers defined therein. One of the chambers is a burning chamber wherein the tobacco to be smoked is burned, beneath the burning chamber is a screen, a control valve that varies the diameter of the passage between the burning chamber and a cooling chamber underneath this valve. A second screen separates the cooling chamber from a third chamber, called the filtering chamber. The filteri...

A smoking pipe consisting of a bowl providing a tobacco chamber and stem having a stem opening connected to the bottom of the tobacco chamber. The wall forming the tobacco chamber has air passages formed in the wall which connect from the upper end of the bowl wall to the bottom of the tobacco chamber where the air passages connect to each other and to the stem opening whereby when the pipe is packed with tobacco and lighted air will be drawn through the air passages to the stem opening and will...

A piping system for conveying one or more product flow lines within an outer casing includes a layer of insulation on each of the product flow lines to prevent heat lost and an improved spacer arrangement forming an interface between the product flow lines and the casing to prevent damage to the casing and flow lines as well as reduce friction when the flow lines are pulled through the casing. The spacer includes a pair of halves that can be assembled together using a bolted connection, for exam...

The water pipe includes a pipe body which is used as a water pipe, supply-pipe, drainage pipe, including a mixed layer, provided at an inner surface of the pipe body, the mixed layer including a mortar layer and a resin layer and being mixed into a mixture which includes powder of tourmaline ore, granite and charcoal grain powder with effects for far-infrared ray and anion. Therefore, it can improve water quality efficiently and prevent degradation of a pipe, and it can be used in the large flow...

A pipe in pipe assembly. A coupling is used to join the ends of the inner pipe. The inner pipe is centralized within the inner pipe to provide axial resistance but minimum restraint transverse to the axis of the assembly. This provides sufficient flexibility of the inner pipe to accommodate the necessary tolerances to permit the use of the coupling. The inner pipe may be centralized within the outer pipe by the use of foam injected between the inner and outer pipe and a corrugated web sleeve aro...

A double-pipe pipe coupling comprises a socket provided with a socket main cylinder having a front end portion on which taper holes are formed, locking balls housed in the taper holes and a sleeve on the outer periphery of the front end portion of the socket main cylinder. The plug is provided with a plug main cylinder on which an annular groove is formed. The socket has a cylindrical slide ring and a collar cylinder arranged coaxial to each other, and first and second passages and defined by th...