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 example, with flanges provided on the halves. An integral polymeric body comprises each of the halves with projecting portions spaced circumferentially about each of the spacers, the projecting portions extending longitudinally and radially and having inclined surfaces that lessen stress during the pulling of product flow lines through the outer casing. Annular shoulders on the spacer mate with corresponding annular shoulders of the insulation layer to prevent heat loss at the interface.
CROSS-REFERENCE TO RELATED APPLICATIONS
Priority of U.S. Provisional Patent Application Serial No. 60/056,227, filed Aug. 21, 1997, incorporated herein by reference, is hereby claimed.
Disclosure Document No. 411,183, filed Jan. 21, 1997, is hereby incorporated by reference. In accordance with M.P.E.P. Section 1706, please retain Disclosure Document No. 411,183, filed Jan. 21, 1997 and entitled "PIPE WITHIN A PIPE FLOWLINE BUNDLE SPACER".
A distribution tube assembly for an irrigation system having a main supply line for conveying fluid therein includes a first end, a second end and an internal surface defining at least two fluid passageways, at least one of the fluid passageways being in fluid communication with the main supply line. The other fluid passageway may be in fluid communication with an alternate supply line. Adaptors and regulators may be attached to the distribution tube assembly. The distribution tube assembly permits irrigation to be performed by multiple fluid streams, allows for the incorporation of chemicals within the distribution tube assembly, and provides for selectable flow control.
In general submerged pumps are lowered into a trench by means of the power cable (12) which passes into the pump head (10). In order to avoid an unnecessary loading on the power cable (12) the invention proposes providing a protective hose which surrounds the power cable (12) and which is secured to the pump head (10) and by means of which the submerged pump can be lowered without in that case loading the power cable.
A method for forming a plurality of heat transfer fins on at least an inner surface of a conduit in a heat exchanger, the method comprising: forming a plurality of criss-crossing slots in at least a portion of the inner surface of the conduit, the plurality of slots defining the plurality of heat transfer fins therebetween.
An integrated casing spacer and joint restraint unit is attached to each of a pair of pipe sections adjacent to an end-to-end connection of the pipe sections by means of first and second spacer/retainer ring members. Disposed on the outer periphery of each ring member in a spaced manner are plural risers each having a respective runner disposed on its outer end for engaging an inner surface of an outer casing and maintaining fixed spacing between the inner pipe sections and the outer casing. Plural paired risers, with one riser disposed on each ring member, are aligned with one another along the axis of the connected pipe sections and are each adapted for secure connection to a respective connecting rod for securely coupling the two ring members together and restraining relative movement between the two pipe sections.
