DE2914725A1 - Composite pipe bend - comprises half shells formed by segments joined along different radial planes - Google Patents

Abstract

The pipe bend is composed of two half-shells (6, 7). Each is assembled from individual segments (1-5) joined together. The joins between the two segments in each half-shell are in different planes, extending radially in relations to the bend. Welds can be made to join them and the shells together without the seams intersection.

Description

Compound pipe elbow

The present invention relates to a pipe elbow according to the preamble of the protection claim, in particular for bends with an angle of more than 90 ° and for pipelines larger diameter (e.g. from 250 - 1000 mm).

Rohcogen for connecting pipes at right angles to each other such dimensions are readily available as commodities. You are from two half-shells welded together, each of which z. B. in Is drop forged. The elbows required for bend connections under 90 ° are made by appropriately cutting a 90 elbow pipe as required.

On the other hand, it is more difficult to manufacture pipe elbows for bend connections over 90 °. Such an elbow is made up of parts of two or more 90 ° elbows put together, this leads to the Welding together inevitably to the fact that so-called cross seams arise: There is at least one point from which emanate from four weld seams, which are usually at right angles to one another. In plants, to which increased safety requirements are made, so also in kerrtechnischen Attachments, such cross stitching encounter concerns. One possible solution to this problem, namely to insert a piece of straight pipe between the two pipe bends, such that its possibly existing longitudinal weld compared to that of the pipe elbow is offset, leads to increased space requirements and to an additional, under certain circumstances weld seam subject to inspection. The additional possibility of using induction bending machines Bending straight pipes to the required elbows is very time-consuming and only starts certain radii and wall thicknesses feasible.

The object of the present invention is a pipe bend, in particular for bends over 90 °, made from standard pipe half-shells or from ropes the same can be put together without cross welds.

The task is solved according to the characterizing part the protection claim in that individual sections of the above 90 ° half-shells be assembled so that the circumferential weld seams in both half-shells are offset from one another.

An embodiment of the invention is shown in the drawing, namely, Figure 1 shows the view and Figure 2 shows the plan view a pipe bend for connecting two not shown here, at an angle of £ 0 to each other standing pipelines; the angle OC was assumed here to be 120 °.

The pipe bend consists of an upper half-shell 6 and a lower one Half-shell 7, which are welded together by two longitudinal seams. The upper Half-shell 6 consists of two individual segments 1, 2, here each with an assumed one Arch angle of 60 0. The lower half-shell 7 is made up of three individual segments 3, 4, 5, of which the middle 4 in the example also has an arc angle of ~ / 2 = 60 °, while the side pieces 3, 5 each have an arc angle of OC / 4 = 30 0; Of course, other than those specified here are also possible Angular relationships possible. From Figure 1 it can be seen that designated by T on the Only make T-seams, not cross seams.

The additional welding work required is less than the one mentioned above Alternative.

Claims (1)

Composed pipe elbow Protection claim from two half-shells composite pipe elbow having the following feature; a) Each half-shell (6, 7) is in turn composed of interconnected individual segments (1 - 5) in such a way that that the seams between the individual segments of the two half-shells in each case different, radial planes fall to the pipe elbow.