GB2222222A

GB2222222A - Sheathing device for a row of pipes

Info

Publication number: GB2222222A
Application number: GB8916219A
Authority: GB
Inventors: Jean-Francois Chevasson; Jacques Ricard
Original assignee: Didier Werke AG
Current assignee: Didier Werke AG
Priority date: 1988-07-16
Filing date: 1989-07-14
Publication date: 1990-02-28
Anticipated expiration: 2009-07-14
Also published as: NL8901262A; DE8809173U1; IT1231617B; GB8916219D0; BE1003364A3; SE8902518D0; IT8948130A0; GB2222222B; FR2634277A1; FR2634277B1; SE8902518L

Abstract

A sheathing device for a row of pipes, particularly in a superheater or in a heat exchanger, comprises two shaped bodies (1, 2) of abrasion-resistant, good thermally conducting ceramic material (eg. SiC) whose edges (6, 8 and 7, 9) engage and which define a space (3) for receiving the row of pipes. The shaped bodies (1, 2) are held together by two clamp members (14, 15) of U-shape which have inwardly extending formations (16, 17) on the inner surface of their limbs which engage in recesses (10) in the outer surface of the edges of the shaped bodies (1, 2). The bodies (1, 2) may extend the entire length of the pipes as a single or a plurality of entities. <IMAGE>

Description

SHEATHING DEVICE FOR A ROW OF PIPES The invention relates to a sheathing device for a plurality of pipes or tubes arranged in a row, particularly such pipes which form part of a superheater of a boiler installation or a heat exchanger.

Between the rows of pipes in a superheater of a boiler installation or in a heat exchanger there are spaces through which a hot medium flows. It is necessary that the walls of the pipes be protected against attack by the medium. For this purpose each pipe could be manufactured from an appropriately resistant material. This would, however, be expensive.

It is the object of the invention to provide a sheathing device for a row of pipes which is of simple construction, may be easily assembled, protects the pipe assembly and conducts heat.

According to the present invention there is provided a sheathing device for a row of pipes comprising two shaped bodies of ceramic material which together define a space for receiving the row of pipes and two clamp members which hold the edges of the shaped bodies together. The material of the shaped bodies, and preferably of the clamp members also, is abrasion-resistant and of good thermal conductivity and is preferably an SiC material. The shaped bodies line the row of pipes and thus protect it against the action of the medium which flows around it whilst nevertheless permitting heat exchange between the pipes and the flowing medium.

The shaped bodies and the clamp members are simple components which may be easily assembled. Advanta geously the entire row of pipes may be sheathed with only two shaped bodies and two clamp members.

It is preferred that the adjacent edges of the shaped bodies have recesses which extend in the longitudinal direction on their outer surfaces and into which the clamp members engage. Preferably the clamp members are of substantially U section with inwardly extending formations on the inner surfaces of their limbs which extend into the recesses in the shaped bodies. Preferably the two shaped bodies are of the same shape and the two clamp members are of the same shape also. Thus only items of two different shapes are necessary to sheath a row of pipes.

The invention also embraces a row of pipes sheathed by such a device whose surfaces are closely engaged by the surfaces of the shaped bodies which define the receiving space. A row of pipes may be sheathed with such a device by placing the shaped bodies against the pipes from opposite directions and sliding the formations on the clamp members into the recesses in the shaped bodies in the longitudinal direction of the pipes.

Further features and details of the invention will be apparent from the following description of one exemplary embodiment which is given by way of example with reference to the single accompanying Figure which is a plan view of a sheathing device.

The sheathing device essentially comprises two moulded or shaped bodies 1, 2 of the same shape and two clamp members 14, 15 of the same shape, all of which are manufactured of the same abrasion-resistant ceramic material of good thermal conductivity. Each moulded body comprises an elongated body with one elongate outer surface 4, 5 being essentially flat and smooth and the opposing surface defining a recess whose base affords a plurality of part-circular recesses. In their assembled state the moulded bodies define a space 3 for receiving the row of pipes. The moulded bodies may extend over the entire length of the row of pipes, i.e. perpendicular to the plane of the drawing.

Alternatively, a plurality of moulded bodies can be arranged in the longitudinal direction of the row of pipes. The shape of the receiving space 3 is matched to the outer shape of the row of pipes so that the moulded bodies closely engage the row of pipes.

At their edges 6, 7 and 8, 9 the moulded bodies 1, 2 have portions of reduced thickness which terminate in bars or strips 13 of somewhat increased thickness.

Adjacent the portions of reduced thickness each moulded member affords an outwardly directed recess 10 which extends in the longitudinal direction and is bounded by an oblique surface 11 extending from the outer surfaces 4, 5 to the base of the recesses 10 and by an oblique surface 12 afforded by the associated bar 13.

The clamp members 14, 15 are of substantially Ushaped cross-section with an inwardly extending formation 16, 17 on the inner surface of each limb whose size and shape correspond to those of the recesses 10. The bars 13 fit snugly into the spaces behind the formations 16, 17.

The assembly of the sheathing device is as follows: The moulded bodies 1, 2 are placed against the row of pipes in the directions of the arrows P.

Subsequently, the formation 16, 17 on the clamp members 14, 15 are slid in the longitudinal direction into the recesses 10. The edges 6, 8 of the moulded bodies 1, 2 are held together by the clamp member 14 and the edges 7, 9 are held together by the clamp member 15. Gaps 20 may be left between the bodies 1, 2 to compensate for tolerances or alternatively such gaps 20 may be omitted in order to avoid a bending moment.

Claims

1. A sheathing device for a row of pipes comprising two shaped bodies of ceramic material which together define a space for receiving the row of pipes and two clamp members which hold the edges of the shaped bodies together.

2. A device as claimed in Claim 1 in which the outer surfaces of the shaped bodies directed away from the receiving space are smooth and flat.

3. A device as claimed in Claim 1 or 2, in which the clamp members comprise the same material as the shaped bodies.

4. A device as claimed in any one of the preceding claims, in which the adjacent edges of the shaped bodies have recesses which extend in the longitudinal direction on their outer surfaces and into which the clamp members engage.

5. A device as claimed in Claim 4 in which the clamp members are of substantially U section with inwardly extending formations on the inner surfaces of their limbs which extend into the recesses in the shaped bodies.

6. A device as claimed in Claim 4 or Claim 5, in which the recesses are defined by a base and side surfaces which extend at an obtuse angle to the base.

7. A device as claimed in any one of the preceding claims, in which the outer surfaces of the clamp members (14, 15) are flush with the outer surfaces of the shaped bodies (1, 2).

8. A device as claimed in any one of the preceding claims in which the two shaped bodies (1, 2) are of the same shape.

9. A device as claimed in any one of the preceding claims in which the two clamp members are of the same shape.

10. A device as claimed in any one of the preceding claims in which the ceramic material is an SiC ceramic.

11. A sheathing device for a row of pipes substantially as specifically herein described with reference to the accompanying drawing.

12. A row of pipes sheathed by a device as claimed in any one of the preceding claims whose surfaces are closely engaged by the surfaces of the shaped bodies which define the receiving space.

13. A method of sheathing a row of pipes with a device as claimed in Claim 5 or any subsequent claim when dependent on Claim 4 which comprises placing the shaped bodies against the pipes from opposite directions and sliding the formations on the clamp members into the recesses in the shaped bodies in the longitudinal direction of the pipes.