DE2405722A1 - DEVICE FOR HEAT TREATMENT OF PIPES - Google Patents

Description

Paul Thomas Maddock, of British, nationality, of 92 Alltwen Hill, Pontardawe, Swansea, Glamorganshire, United Kingdom

Device for the heat treatment of pipes

The invention relates to a heat treatment device for the inner surface of a metal blank

res.

Where metal pipes are joined by butt welding it is often necessary, especially with large diameter pipes, such as those that make up the walls form of oil carried in water, to heat the pipe metal before welding or welded pipe metal

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subject to a heat treatment in order to bring about a relaxation of the stress induced during welding. Although heating can be applied to the exterior of a pipe to treat it, it emerges hence a considerable waste of energy in the external environment, and so it is preferred to heat the pipe inside.

So far, the internal heating has been done with a round radiant heater, which is centrally located within the to be treated The pipe is mounted by means of three or more radially expanding struts which extend on the inner surface of the pipe. A change in the heating of pipes, the walls of which are of different thicknesses, is controlled by change the supply of gaseous combustion products, which are fed to the device, because the device is always at a fixed distance from the inner surface of the pipe by radially extending supports. Not only is this control very difficult, it is suitable to highlight the main drawbacks of the device.

In this method of heat treatment it was found that the flames and gaseous products of combustion are the upper ones Heat part of the tube to a greater extent than the lower part due to convection. That leads to very unsatisfactory Heat treatment. In addition, it is necessary that

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Change the focal strength in order to vary the heating of the tube. ¹ disproportionate heating of the upper part of the tube also varies and is difficult to control and compensate.

The object of the present invention is to design the device so that it is capable of the inner surface to heat a metal pipe in a more even and more controllable manner than was previously possible *

According to the invention, a heat treatment apparatus is provided for heating the inner surface of a metal tube, consisting of at least one radiant heating element, the at one end of a radial feed line for a combustible Gas is attached, wherein the radial supply line is perpendicular to the axis of a rotatable supply line extends, which is adjustable in the direction of the axis of the metal tube is.

Preferably, the radial supply line is designed telescopically so that an adjustment of the heating element for heating the inner surface of pipes with different diameters, and consists of a base part, which is attached to the rotatable feed line and extends evenly to both sides of the rotatable feed line extends and an inner part, which from

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extends from one end of the base part and has the same length as the base part, 'wherein the rotatable supply line is connected to the radial feed line by means of a side line, which in turn is connected to the other End of the base part of the radial supply line is in communication.

With a device like this, the heating element can be in very close contact with the inner surface of the pipe, in this way to ensure much more radiant heat on this surface. The amount of warming can be controlled are made by changing the heating time and the speed of the or each heating element that is inside of the pipe rotates. The rotatable supply line can be arranged below the axis of the metal pipe, so that any convective heating of the upper part of the pipe is compensated for by stronger radial heating of the lower part of the pipe. The radial feed line is advantageously attached to an adjustable frame which is perpendicular in length is adjustable to the axis of the rotatable supply line and in a preferred construction has the adjustable Frame with two right-angled ends supported by telescopic legs and spring-loaded wheels which run on the inner surface of the tube for axial movement of the frame along the metal tube to enable.

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Each rectangular end is supported at its corners by telescopic legs, each of which is at least two telescopic has associated parts and clamps to hold each cooperating pair of inner and outer parts together associate.

With a normal clamp, which has a set screw that goes through an opening in the outer part of a cooperating A pair of inner and outer portions of a telescopic leg to engage the inner portion en, there is a risk that the adjustable clamp that outer surface of the inner part is deformed and in this way easier sliding of the inner part in the outer Part impaired. This error can be avoided if it is ensured that each clamp has a stop, which is housed in a recess formed internally in a ring for engagement with the inner end of the set screw to engage and extend through an opening formed in the outer portion of the telescopic leg, to connect to the inner part of the telescopic leg. The stop has an inner surface, which corresponds to the outer surface of the inner part.

To the possibility of accidental ignition of the gaseous To reduce fuel inside the metal pipe, e.g .: as a result of spark transitions between parts of an electric motor, can the rotatable drive of the rotatable feeder

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tung must be equipped with a compressed air motor. The adjustable one The frame can therefore carry a housing that has a compressed air motor includes, as well as a reduction gear, which connects the air motor with the rotatable supply line and bearings that support the rotatable supply line.

In this construction, a mixing chamber can be inside the Housing at one end of the rotatable supply line and connected to two supply pipes mounted with adjustable valves for the delivery of gaseous fuel and oxygen to the rotatable supply line are equipped and it is possible that one of the gaseous products which are fed to the mixing chamber, first is passed through the air motor to supply the rotating drive.

The details of a device according to the invention are shown schematically and by way of example in the drawing. It demonstrate:

ig. 1: a schematic perspective view of the device and

ig. 2: the bottom view of a clamp part of the device.

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As shown in Fig. 1, two radiant heaters are on two radial feed lines formed by tubes 15A, 15B are mounted, which extend perpendicular to a rotatable supply pipe 10, and rotate within of the metal pipes 21 and 22 in order to heat the metal in the area of the joint between these two pipes. The rotatable Feed pipe 10 is aligned according to the axes of pipes 21 and 22 and guided in bearings 7 and 11, which are arranged in a housing JO (only partially shown) are, ^ which is part of an adjustable frame 23A, which is supported on wheels 18A for axial movement along tubes 21 and 22.

Compressed air, which is passed through a line /, feeds a compressed air motor 4, which is provided with a reduction gear 5, and one on the output shaft (not shown) The reduction gear 5 that is located meshes with a gearwheel <£ B and causes a further reduction in speed. The gear 9B is non-rotatable with the rotatable feed pipe connected so that it can be rotated by the air motor 4-.

Compressed air and propane (gas) are supplied through lines 1A and 2A, which are equipped with adjustable valves 1B and 2B are led to a mixing chamber 6. The open end of the rotatable supply pipe 10 is from the mixing chamber / um- ■ closed, and a lock (not shown) prevents

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the outflow of gas from the mixing chamber 6 to the outside of the rotatable supply line 10.

The combustible gaseous mixture is in this way passed through the rotatable supply line 10 into a branching chamber and, through connecting lines 13A and 13B _5, which are equipped with brake valves 14-A and 143, to the ends of two base parts 15A- of the rotatable supply pipes, which carry the radiators 17. The two base parts 15A are held in a clamp 10A at the end of the rotatable feed tube and extend equally on the opposite sides of the clamp 10A. The inner parts 1f-B of the rotatable supply pipes, which are commonly connected to the burners 17, are slidable in the base parts 15A and screwed in place with glands 16 which cooperate with silicon rubber O-rings (not shown). Another silicon-rubber O-inlet (not shown) is attached between the inner end of each inner part 15B and the "enclosing base part 15A. The combustible gaseous mixture which is supplied to the burners 17 can therefore be burned to remove the Generate radiant heat and the rotation speed of the burners can be varied between 0 and 12 rpm to control the amount of heating.

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In a typical construction, the base portion is both 15-Å and also, the inner part 15B of the radial feed pipe 2! Feet long so that the device is able to pull the lines au heat whose diameter is between 3 and 7 feet varies.

The support wheels 18A d * s adjustable frame 23 are on opposite sides Ends of two leaf springs 18B arranged, which at axially opposite ends of rectangular End pieces 23A of an adjustable frame 23 are mounted and the four corners of each end piece 23A are telescoped Legs 24-A, 24-B, 24-C, which are carried with the housing 30 by brackets 31 and plates 32 (only partially shown) are connected.

As shown in Fig. 2, each clamp 20 has a ring 25, around each cooperating pair of inner and outer parts 24-A, 24B or 24-B, 24-G of each telescopic leg of the adjustable frame 23 to be connected to each other, on the outside of the outer part 24-A (as shown in Fig. 2) with the aid of a set screw 26A and with the inner part 24B (as shown in! Fig. 2) with the aid of an adjustable screw 26B is attached, which is guided in a thread in a radial opening in the ring 25 and impinges on a stop 27, which is housed in a recess 28, the inside

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is formed in Hing 25. The stop 27 has an inner one Surface 27A, which is the outer surface of part 24-B and passes through an opening 29 which is formed in the outer cable 28.

Claims;

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Claims (1)

PATENT CLAIMS 1. j) Heat treatment device for heating the inner surface of a metal pipe, characterized in that that it has at least one radiating heating element (17) at one end of a radial.Zuführungsleitung (15A, I5B) is appropriate for a flammable gas, where the radial feed line (15A, 15B) perpendicular to the axis a rotatable feed line (10) which is adjustable in the direction of the axis of the metal tube (21, 22). 2.) Heat treatment device according to claim 1, characterized in that the radial supply line (15A, 15-B) telescopic ar is figured, such that a. Adjustment of the heating element (17) for heating the 409834/0349 - II - Inner surface of tubes (21,22) with various. diameter is made possible ) Heat treatment device according to claim 2, characterized in that the rotatable supply line (15A, I5B) consists of a base part (I5B), which is attached to the rotatable feed line (10) is and expands evenly on both sides of the rotatable supply line (10) and an inner part (15B) which extends from one end of the base part (15A) and the same length as the base part (15A), the rotatable feed line (10) with the radial feed line (15A, 15B) with the help of a side line (13A or 13B) is connected, which in turn is connected to the other end of the base part (15B) of the radial feed line (15A, 15B) communicates. ) V / heat treatment device according to the preceding claims, characterized in that the rotatable supply line (10) is in an adjustable frame (23) is attached, which is adjustable in its extent perpendicular to the axis of the rotatable supply line (10) is. - III 409834/0349 - SSS-- 5.) Heat treatment device according to claim 4, characterized .marked that the adjustable frame (23) has two right-angled end pieces (23A), which are supported by telescopic legs (24A, 24B, 24C) and has spring-loaded wheels (15A), which run on the inner surface of the tube (21, 22) to allow axial movement of the frame along the Metal tube (21, 22) to enable. 6.) Heat treatment device according to claim 5 »characterized in that each rectangular end piece (23A) of the adjustable frame (23) supported at its corners by four telescopic legs (24A, 24-B, 240) becomes, each of which is at least zx ^ ei telescopically connected Has parts (24A and 24B or 24B and 24G) and clips (20) to hold each cooperating pair of inner and external rushes to connect with each other. 7.) Device according to claim 6, characterized in that each clamp (20) includes a ring (25), which encloses an outer part (24A) of a telescopic leg (24A, 24B, 240) and an adjustable screw (26B), which is guided in a thread of a through the ring (25) through radial opening that an in a recess (28) within the ring (25) accommodated stop (27) for supporting the inner end -IV-40 ^ 834/0349 the adjustable screw (263) is provided and that this stop extends through an opening (29), which is formed in the outer part (24A) of the telescopic leg for connection with the cooperating manufacture inner part (24B) of the telescopic leg, wherein the stop (27) has an inner surface that is the same as the outer surface of the inner part (24B). 8.) Door direction according to claim 4 to 7 »characterized in that the adjustable frame (23) a Housing (30) which contains a compressed air motor (4), a reduction gear (5 and 9-Ä-, 9B), which the Compressed air motor (4) with the rotatable supply line (10) connects, sox ^ ie bearings (7 and 11), which the rotatable Wear feed line (10). 9.) Device according to claim 8, characterized in that a mixing chamber (6) within the housing (30) arranged at one end of the rotatable supply line (10) and connected to two supply pipes (1A and 2A) is the one with adjustable valves (1B and 2B) for the supply of gaseous fuel and oxygen to the rotatable supply line (10) are equipped. Dipl.-Ing. H.D. Ernicke patent attorney 0ί834 / 0349 JtS t e rs e i t e