US4732796A
Expired / Lapsed
US
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Refractory sheathing for pipes in preheating furnaces
Assignee: Bloom Engineering Europa GmbH
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Filing: 1986-03-21
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Granted: 1988-03-22
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Expires: 2006-03-21
Abstract
Abstract A refractory sheathing (1) of incombustible, compressed, flat insulating bodies (8) made of mineral or ceramic fiber for thermally insulating pipes (10) in preheating furnaces fired from below in the steel industry is described. The insulating bodies (8) have an inner and, if desired, also an outer arc-shaped profile, they enclose the pipes (10) to be insulated totally or almost totally in circumferential direction, and they are secured at the pipe in close mutual abutment by at least two retainers which engage the ends of a plurality of adjacent insulating bodies (8) forming a stack of insulating bodies. The risk of separating from the pipe during the constant vibrations of the same is reduced and the space requirement for installation at the building site as well as the cost of mounting involved are scaled down by the line-up of a plurality of insulating bodies (8) on a plurality of spaced apart rods (11) to form a highly compressed insulating body stack. Between the retainers of the rods (11) acting at the ends, a plurality of compression holding clamps (16) are secured at mutual spacings. The tips (14) of the rods (11) may project beyond at least the one end face or butt face (23) of the insulating body stack which presents a prefabricated fibrous shaped section (2) and may be received in the end face or butt face (23) facing the same or in the retainer of the adjacent shaped section (2).
Inventors
- 👤 Peter Schatschneider
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-03 15:11
CPC Classifications
F; F27; F27D; F27D1/00; F27D1/04; F27D1/045; F16; F16L; F16L59/00; F16L59/12; F16L59/14; F16L59/145; F27D1/0003; F27D1/0006; F27D1/0009; F27D1/002; F27D3/00; F27D3/02; F27D3/022; Y; Y10; Y10T; Y10T428/00; Y10T428/13; Y10T428/131; Y10T428/1314
Claims Analysis
Total Claims: 20
Claim 1
Independent Claim
176 words
A refractory sheathing of incombustible, compressed, flat insulating bodies made of mineral or ceramic fiber for thermally insulating pipes, skid pipes, supporting pipes, risers, and the like in preheating furnaces, pusher furnaces, or walking beam furnaces, the insulating bodies having an inner and, if desired, also an outer arc-shaped profile, enclosing the pipe to be insulated totally or almost totally in circumferential direction, and being secured at the pipe in close mutual abutment by at least two retainers which act at the ends of a plurality of adjacent insulating bodies forming a stack of insulating bodies, characterized in that a plurality of insulating bodies are lined up on a plurality of spaced apart rods to form a highly compressed insulating body stack, in that a plurality of compression holding clamps are fixed spaced from each other on the rods between insulating bodies and the retainers provided at the ends of the stack, and in that the tips of the rods project beyond the end face of the stack of insulating bodies forming a prefabricated shaped section.
Claim 2
Dependent Claim
176 words
A refractory sheathing of incombustible, compressed, flat insulating bodies made of mineral or ceramic fiber for thermally insulating pipes, skid pipes, supporting pipes, risers, and the like in preheating furnaces, pusher furnaces, or walking beam furnaces, the insulating bodies having an inner and, if desired, also an outer arc-shaped profile, enclosing the pipe to be insulated totally or almost totally in circumferential direction, and being secured at the pipe in close mutual abutment by at least two retainers which act at the ends of a plurality of adjacent insulating bodies forming a stack of insulating bodies, characterized in that a plurality of insulating bodies are lined up on a plurality of spaced apart rods to form a highly compressed insulating body stack, in that a plurality of compression holding clamps are fixed spaced from each other on the rods between insulating bodies and the retainers provided at the ends of the stack, and in that the tips of the rods project beyond the end face of the stack of insulating bodies forming a prefabricated shaped section.
Claim 3
Dependent Claim
23 words
The sheathing as claimed in claim 1, characterized in that the compression holding clamps are provided following every second or third insulating body.
Claim 4
Dependent Claim
31 words
The sheathing as claimed in claim 1, characterized in that the compression holding clamps comprise claws or lugs protruding from at least one side and engaging in the adjacent insulating bodies.
Claim 5
Dependent Claim
28 words
The sheathing as claimed in claim 1, characterized in that the stack of insulating bodies has a density on the order of at least 250 kg/m 3 .
Claim 6
Dependent Claim
23 words
The sheathing as claimed in claim 4, characterized in that the body stack has a density of 250 to 300 kg/m 3 .
Claim 7
Dependent Claim
35 words
The sheathing as claimed in claim 1, characterized in that the tips of the rods are received in the end face or butt face facing them or in a retainer of the adjacent shaped section.
Claim 8
Dependent Claim
58 words
The sheathing as claimed in claim 6, characterized in that the retainer at the one end of the shaped section is embodied by a collar sleeve slipped on the end of the rod and having a tubular shaft which takes up the rear end of the rod and the tip of the rod of an abutting shaped section.
Claim 9
Dependent Claim
57 words
The sheathing as claimed in claim 6, characterized in that the retainer at the one end of the shaped section is embodied by a slipped-on compression holding clamp having two locking apertures, one of which takes up the rear end of the rod and the other one the tip of the rod of an abutting shaped section.
Claim 10
Dependent Claim
46 words
The sheathing as claimed in claim 1, characterized in that the shaped sections are designed to have approximately half-shell shape and the rods are interconnected mechanically at both sides at least of the one axial butt face, especially by means of clips or slip-on plates (holders).
Claim 11
Dependent Claim
43 words
The sheathing as claimed in claim 1, characterized in that shaped sections enclosing the pipe in part only are designed to be stepped in longitudinal direction such that shaped sections which are contiguous in circumferential and longitudinal directions constitute a closed composite structure.
Claim 12
Dependent Claim
30 words
The sheathing as claimed in claim 9 or 10, characterized in that the axial butt faces of mutually abutting shaped sections are stepped or formed with a groove and tongue.
Claim 13
Dependent Claim
67 words
The sheathing as claimed in claim 9 or 10, especially for skid pipes, characterized in that flat semicircles which overlap each other over each axial butt face are inserted between the end faces of mutually abutting shaped sections, the rods of both shaped sections penetrating the semicircles in the overlapping area and the semicircles engaging the pipe at least at the side opposite the axial butt face.
Claim 14
Dependent Claim
34 words
The sheathing as claimed in claim 9, characterized in that the insulating bodies are cemented together at least in the area of the ends facing the axial butt faces of their lateral end faces.
Claim 15
Dependent Claim
77 words
The sheathing as claimed in claim 9, characterized in that a physically stable, preformed insulating body of annular sectional shape and a denisity of at least 250 kg/m 3 is inserted between two each of fibrous insulating bodies and has a radial extension less than that of the fibrous insulating body, and in that the ends standing out of the fibrous insulating bodies are molded or flanged across the outer surfaces of the physically stable insulating bodies.
Claim 16
Dependent Claim
40 words
The sheathing as claimed in claim 9, characterized in that the shaped sections are provided at the outside with a protective layer especially on the basis of zirconium or silicate and having a thickness of from 0.5 to 5 mm.
Claim 17
Dependent Claim
41 words
The sheathing as claimed in claim 1, especially for skid pipes or supporting pipes, characterized in that the shaped section surrounds the pipe substantially completely continuously and the retainers permit the shaped section to be opened for application to the pipe.
Claim 18
Dependent Claim
24 words
The sheathing as claimed in claim 16, characterized in that the retainers consist of resilient sheet material having radially protruding lugs for the rods.
Claim 19
Dependent Claim
63 words
The sheathing as claimed in claim 16, especially for smooth pipes and supporting pipes having support heads, characterized in that the retainers consist of two sheet material pieces which are articulated to each other and have protruding lugs for the rods, and at their ends facing each other the sheet material pieces include bends or projections for connection upon application to the pipe.
Claim 20
Dependent Claim
50 words
The sheathing as claimed in claim 16, characterized in that the insulating body from which projects the tip of the rod is fixed by an annular disc slipped on the rod and resting axially on a thrust bearing provided on the rod, especially in the form of a welding spot.
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USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1991-03-22 | 1991-09-21 | 1992-03-22 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1995-03-22 | 1995-09-21 | 1996-03-22 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1999-03-22 | 1999-09-21 | 2000-03-22 | $7700.00 | Window Closed / Lapsed |