CA1133404A - Pipe elbow - Google Patents

Abstract

ABSTRACT OF THE DISCLOSURE

A pipe elbow adapted to change the direction of flow of a fluid containing abrasive material in suspension, is disclosed.
The pipe elbow comprises a pair of half-sections of different radiuses, longitudinally sacured together, a wear-resistant lining located at least in the half-section of greater radius of the elbow, and means at each end of the pipe elbow for connection with adjacent pipe sections.

Description

This invF3ntiorl rf31ates to pipn llhllw~lsed in cnnduit 3ystelrls fnr chanr~ino thf dirlcti(3~ f fIow of fluids containing ahrasivf mit ria] in suspt!rlsinn.
In tne past few y~mllci, thrlre has b~on .n incrsassd d~3mand from heavy procF3ss industry, mora particul.lr~ly the mining industry, for pipes and ~lbows for U9f in tho tl~nsl,rlrt of bulk material. In ordsr to proluct tnf3 ~3Ibows Iglirlst exc~ssivf3 wnar due to abrasion~
such slbows arn gr3nerally co.ltr?li with lininr~ material, such as csramic; hut, nevF3rthL31sss, ths linrlrl r30rtinn of the F31bows still wt3ars out quickly and the cnndllit systr,m must be dismantled to replace the worn-out elbows.
It is thr~refore th~3 otjrrt uf thH presf!nt invention to provide an elbow having its portion ohich is most exposed to wear, rF3movahls so that it can be rF3plDced without having to dismantlr3 the whols ronduit system. The pip(? elt3nw~ in accordarlce with the invention, comprisss a pair of half-section3 of diffnrHnt radiuses, longitudinally secured togsthr~r, a wflar-resistant lining locatcd at least in the half-st3ction of grHatsr radius~ Anti mr3Ans at ~3ach r~lld of the pipe elbow for connection with adjacf!llt pip~ s~3(tions.
Fach half-ssction is r3referably prnvidr~d with two longitudinal side flangss extending outwardly. Such side flanges are secured together in any ronv~nif1nt way. For exam~ 3~ fme of the sids flanges may be provid~3d with a plurality of spac~ld oprninqs and ths other rF3gistering side flange has a plurality of hooks adaptsd to extend through suf;h npenings and be f~ngagsd by an FIlongat~3d slement, such as a rod or a cable, for securirlig thfl two sidr flan(3ss toqethr3r.
The snds of ths piF3J elbow are p~fr3rably provided with an integral end flanqe and a cIarnning ring is adallted to sscure such flange to an adjacent pipH sr~ction.
3n Thf3 invsntion will now he disclnsf,d, by way of examplf3, with referen~! 'fO prr3ferrF~ 3lllbodinlfJrlts illustr:ItF3li in the acromr3anying 1133~

drawinyi, irl which:
~ i~3ure 1 illus~ "~ a pf~rspective vit~w of an embodiment of an elbow "lade in acc(idio , with the pre~ nt; in\/orltior);
Fi-~ore 2 illu~itl1tl~ .~ sooti-ln uiel", takt!r) alon~l line 2-2 of Figure l;
~ Fi~ulfl 3 illustratlJs an explod.?~J vi~w of a mean3 for assemblin~ an elbow in arcorddnce llith th. ir)ventirm to an adjacent pipe sectinn;
FiqllrlJ 4 illust~ltle an elbow in ircclrdanro with the invention, partially asifJmbled to an a(ljacent pipa sl1otit)rl;
Figure 5 illust~atus ~ means fnr ~;ecnring together two half-sections nf an elbow in sc-nrtlance with tlle invfJntion;
Figure 6 illustratns a section view tiken along line 6-6 of Figure 5;
Figures 7 to 9 illustrate VariOIJs forms of clamping rings used to secure an elhow in actordsnce with tht inuention to an adjacent pipe section;
Figure 10 illustrates an operation which must be done to the elbow bsfore mounting a Llamping ring thnreon;
Figures 11 and 12 illustrate another embotJiment of a clamping ring used for securing an elbuw in accnrdance with ths invention to an adjacent pipe section; and Figure 13 illustrstes annther form of elbnw made in accordance with the invention.
Referring to Figures 1 and 2 of the tlrawings~ thers is shown a pipe elhow made of two longitudinal half-snctions 10 and 12 having outwardly oxtending side flanges 14 and 16, re~psctivaly, which are joined together to form the elbow. Each section is made of pressed metal and the two sections are removably assemhled together by any suitable means. 0ns convenient means is showrl in Figures 2~ 5, and 6.
Flanges 14 are provided with a plurality uf spaced openings 18 and the mating flange6 16 are provided with hooks 20, which protrude through 11334~

the oper)ings 10. A steu~ l:.d~l,/, or rod 2 , is engaglll intD the hooks 20 to hold the two suctiur,~ ar the pipe elhow togethar. Pre~erably, the hooks 2n alternate toilclr(ls and away from ths elbow half-sections to pravant accidental diu~lrlgagamant o~ c~lbla 22. A ga~kat 24 may ba inserted batwesn the two flangss 14 and 16, ag shown in Figure 6 for saaling th~ elbow.
As shown in Fi~lare~ l and 2 of the drawings, a diamatrically extending bafflo 26 may t,e ie~talled in the pipe elbow, if needed for controlling ths flow of material. Tha edges of the haffla ara conveniantly inserted into a suitable ~lot in tha gaskct 24 for securing the baffla to the elbow. nf coursa, othnr means of secLIring the baffle within the elbow are alsr) anuissged.
Each elbow sectlan 10 and 12 is lined with wear-rssistant linings 20 and 30, respaotivaly, made of ceramic or the like. Of course, lining 28 may be thinnar than sheet 30 and may even not be needed in pipe section 10, which i9 the one with a smaller radius, since this section is not subjected to as m4ch bombardment by the particle flowing to the pipe.
Referring to FigLJras 3 and 4, there is shown how the elbow may be secured to an adjacent pipe section. Each section 10 and 14 is provided with an end flanga 32 and a clamping ring 34 is installed over the end flange in any convenient way. Figures 7 to 9 illuatrata three alternative ways of mcunting tha clamping rings. In Figure 7, the clamping ring 34 i8 cut at 36 and the two ends ara secured together after assembly of the clamping ring 34 over the flange 32 by means of joint 30. In Figure 0~ the clamping ring 34a ia made of two U-shaped portions, each terminatad by a flange 40. The flanges 40 are secured togethar by maans of screws or bolts. In Figura 9, tha clamping ring 34b is also made of twn Ll-shaped portions, which are overlapped at 42. The ovarlapping portians 42 are sacured togathar by maans of scraws or bolts.

Refarring to Figures 3 and 4, tha adjacent pipa section is 11334~4 also provided with an end flange 44 and a gasket 46, which is U-shaped in cross-section, is assembled over the end flanges 32 and 44. Thc pipe section is algo providgd with a clamping ring 48 and the two clamping rings 34 and 48 are secured together by bolts passing through registering holes 50 in the clamping rings. In order to permit the ol~ping ring 34 to rotate for alignment of the holes 50, the side flanges 14 and 16 are cut at a short distance from the end flange 32 and the cut portion 52 is bent flat against the outside wall of the elbow, as shown in Figure 10 of the drawings.
Figure 11 and 12 illustrate a olamping ring 34c~
which is provided with a recess 54, adapted to receive the end flange 32 of the elbow.
The curvature of ths elbow is preferably in the form of an arc of a circle to reduce turbulence in the elbow, but it could also be made in the form of a series of straight sections, such as shown in Figure 13 of the drawings.
As it will be easily understood from the above description, an advantags of the elbow in ~ccordance with the invention is that the conduit system, which is normally made of plural sections of pipes and plural elbows, need not be dismantled when an elbow is punctured. The damaged half-section of the elbow which, most of the time, is the half-section having the greater radius, is simply removed without completely dismantling the conduit system, because the remaining half-section of the elbow maintains the conduit system in position. Another advantage is that the section having a smaller radius can be normally last for several changes of the other half-section.
Although the invention has been disclosed with reference to preferred embodiments. It is to be understood that it is not limited to such embodiments and that other alternatives are also envisaged.

Claims (7)

THE EMBODIMENTS OF THE INVENTION IN WHICH AN EXCLUSIVE
PROPERTY OR PRIVILEGE IS CLAIMED, ARE DEFINED AS FOLLOWS:

1. A pipe elbow adapted to change the direction of flow of fluid-containing abrasive material in suspension, comprising a pair of half-sections of different radiuses, longitudinally secured together at the sides of the elbow to form joints of constant and equal radius, a wear-resistant lining located at least in the half-section of greater radius, and means at each end of the pipe elbow for connection with an adjacent pipe section.

2. A pipe elbow as defined in claim 1, wherein each half-section is provided with two longitudinal side flanges extend-ing outwardly, and further comprising means for securing each pair of mating side flanges together.

3. A pipe elbow as defined in claim 2, wherein one side flange of each pair is provided with a plurality of spaced openings, and wherein the other side flange of the same pair has a plurality of hooks adapted to extend through said openings, and wherein said securing means comprises an elongated element engaging said hooks.

4. A pipe elbow as defined in claim 1, wherein each end of the pipe elbow includes an integral flange extending outwardly and wherein said means for connecting the pipe elbow to an adjacent pipe section, comprises a clamping ring installed over said end flange and adapted to be secured to said adjacent pipe section.

5. A pipe elbow as defined in claim 4, wherein said clamping ring is cut transversely at one point to permit installation over the end flange and the two ends of said clamping ring secured together by means of a joint.

6. A pipe elbow as defined in claim 4, wherein said clamp-ing ring is made in two parts, which are secured together once installed over the end flange.

7. A pipe elbow as defined in claim 2, further comprising a deflecting plate mounted in said pipe and longitudinally secured at the edge thereof between said longitudinal side flanges.