Scored concave-convex rupture disk and method of manufacture

• US 4,655,070 A
• Filed: 09/26/1984
• Issued: 04/07/1987
• Est. Priority Date: 09/26/1984
• Status: Expired due to Fees

• Current Assignee: Miner E. Clift
• Original Assignee: Miner E. Clift
• Inventors: Clift, Miner E.
• Primary Examiner(s): Larson, Lowell A.
• Application Number:
  US06/654,393
• Time in Patent Office: 923 Days
• Field of Search: 220/89 A, 72/324, 72/325, 72/379
• US Class Current: 72/325
• CPC Class Codes: B21D 53/80 dustproof covers; safety covers

Abstract

The present invention relates to methods of manufacturing scored concave-convex rupture disks wherein the disks are score after forming on the convex side, away from the pressure vessel or "process" of which the disk controls pressure so that product cannot build-up in the score and speed corrosion and/or alter burst pressure.

Claims

1. A method of manufacturing a scored concave-convex rupture disk having a known rupture pressure from a section of sheet metal comprising the following steps:

a. sectioning a portion of sheet metal into a disk shaped blank;

b. forming a concave-convex dome on the sheet metal disk blank to a pressure value slightly lower than the disk burst pressure; and

c. forming a score on the convex surface of the concave-convex dome and after forming the concave-convex dome to a pressure value near disk burst pressure.

2. The method of claim 1 wherein the score has a cross-sectional angle of sixty degrees (60°

).

3. The method of claim 1 wherein in step "b," the concave-convex dome is formed on the disk with a pressure at or near the actual burst pressure.

4. The method of claim 3 wherein the disk is formed with a pressure of ninety percent (90%) of its actual burst pressure.

5. A method of forming a scored concave-convex type rupture disk, comprising:

a. sectioning a blank of sheet metal base disk material;

b. determining the burst pressure on the disk base material;

c. forming a concave-convex dome on the disk blank using a pressure of ninety percent (90%) of the disk burst pressure; and

d. scoring the disk on one of its curved surfaces after the concave-convex surface is formed.