US3590475A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Method of making contacting column
Assignee: Air Products and Chemicals Inc
•
Filing: 1969-06-02
•
Granted: 1971-07-06
•
Expires: 1989-06-02
Abstract
Abstract Disclosed in a small diameter contact column having a vertical series of contact chambers separated by perforate plates. Fully erected columns of this type are substantially inaccessible for subsequent placement and attachment of internal parts. The column is achieved by superimposing a plurality of interengaging cylindrical sections adapted along their outermost engaging edges to be rigidly joined and along their innermost engaging edges to receive and support a perforate plate. The perforate plate support means permits free relative movement of the plate due to temperature change and at the same time prevents liquid from passing between the column wall and the peripheral edge of the perforate plate.
Inventors
- 👤 Jacob M Geist
- 👤 Roy A Paul
- 👤 Robert M Thorogood
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-04 20:17
CPC Classifications
B; B01; B01D; B01D3/00; B01D3/14; B01D3/32
Claims Analysis
Total Claims: 3
Claim 1
Independent Claim
250 words
A method of fabricating a welded contact column having vaporliquid contact trays supported therein, the assembly being arranged to permit relative movement between column and tray structure sufficient only to prevent distortion and buckling of the latter resulting from expansion or contraction of the column and tray during fabrication or in service without sacrificing the fluid seal between the contact tray and column, said method comprising the steps of: providing a plurality of rings having complementary end portions adapted for end-to-end interengagement, the inner perimeter at the upper end of each ring having a tray-supporting shelf and the outer perimeters at the top and bottom of the ring being chamfered; seating on the shelf of a first ring a circular tray whose diameter and thickness are such as to provide top and side clearance on the shelf; nesting a second ring on top of the first ring, in interlocking engagement therewith, whereby the bottom end surface of the second ring overhangs the shelf of the first ring to lock the tray loosely in a recess, and the opposed chamfered surfaces form a circumferential groove; applying endwise pressure to the assembled rings; depositing weld metal in the circumferential groove to unite adjacent rings, the clearance provided between the edge of the tray and the confining surfaces of the recess being sufficient to accommodate the differential expansion resulting from the high temperatures obtained by welding, without buckling the tray; and repeating said steps until the desired number of column sections are assembled.
Claim 2
Independent Claim
250 words
A method of fabricating a welded contact column having vaporliquid contact trays supported therein, the assembly being arranged to permit relative movement between column and tray structure sufficient only to prevent distortion and buckling of the latter resulting from expansion or contraction of the column and tray during fabrication or in service without sacrificing the fluid seal between the contact tray and column, said method comprising the steps of: providing a plurality of rings having complementary end portions adapted for end-to-end interengagement, the inner perimeter at the upper end of each ring having a tray-supporting shelf and the outer perimeters at the top and bottom of the ring being chamfered; seating on the shelf of a first ring a circular tray whose diameter and thickness are such as to provide top and side clearance on the shelf; nesting a second ring on top of the first ring, in interlocking engagement therewith, whereby the bottom end surface of the second ring overhangs the shelf of the first ring to lock the tray loosely in a recess, and the opposed chamfered surfaces form a circumferential groove; applying endwise pressure to the assembled rings; depositing weld metal in the circumferential groove to unite adjacent rings, the clearance provided between the edge of the tray and the confining surfaces of the recess being sufficient to accommodate the differential expansion resulting from the high temperatures obtained by welding, without buckling the tray; and repeating said steps until the desired number of column sections are assembled.
Claim 3
Dependent Claim
60 words
A method as in claim 1, including the steps of inserting cylindrical spacers between trays before seating a tray on its shelf, said spacers having complementary threaded elements at their opposite ends, the male element of which projects through a central opening provided in the tray, and screwing the spacers together to clamp the trays into a unitary tray assembly.
References Cited (Backward Citations)
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1974-07-05 | 1975-01-04 | 1975-07-06 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1978-07-05 | 1979-01-04 | 1979-07-06 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1982-07-05 | 1983-01-04 | 1983-07-06 | $7700.00 | Window Closed / Lapsed |