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Patent US4840058A successfully refreshed from Google Patents.
US4840058A
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Method of leak testing a cavity
Assignee: TRAITEMENT AUTOMATIQUE-CONTROLE ET ETANCHEITE Ste
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Filing: 1988-04-01
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Granted: 1989-06-20
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Expires: 2008-04-01
Abstract
Abstract A method of leak testing at least one "main" cavity (1) formed in a body (2), involving filling the main cavity with a test gas (6) at a determined pressure (PO). The leakage pressure variation (15, 16) in the main cavity is measured while reducing the pressure inside the main cavity in steps (dp n ) by means of a controllable valve (12). The various values of leakage pressure variation, are compared with equal values being representative of a part that is leaky and with values that become smaller from one measurement to another being representative of the presence of at least one secondary cavity communicating with the main cavity via a seepage path (4) having high head loss. The two cavities taken together are possibly non-leaky.
Inventors
- 👤 Elie Cohen
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-04 16:58
CPC Classifications
G; G01; G01M; G01M3/00; G01M3/02; G01M3/26; G01M3/32; G01M3/3236
Claims Analysis
Total Claims: 6
Claim 1
Independent Claim
124 words
A method of leak testing at least one "main" cavity formed in a body, the method consisting in filling said main cavity with a test gas at a determined pressure, in measuring the leakage pressure variation in said main cavity while reducing the pressure inside said main cavity in steps (dp n ) by means of a controllable valve, and in comparing the various values of leakage pressure variation, with equal values being representative of a part that may be leaky, and with values that becomne smaller from one measurement to another being representative of the presence of at least one secondary cavity communicating with said main cavity via a seepage path having high head loss, said two cavities taken together being possibly non-leaky.
Claim 2
Independent Claim
124 words
A method of leak testing at least one "main" cavity formed in a body, the method consisting in filling said main cavity with a test gas at a determined pressure, in measuring the leakage pressure variation in said main cavity while reducing the pressure inside said main cavity in steps (dp n ) by means of a controllable valve, and in comparing the various values of leakage pressure variation, with equal values being representative of a part that may be leaky, and with values that becomne smaller from one measurement to another being representative of the presence of at least one secondary cavity communicating with said main cavity via a seepage path having high head loss, said two cavities taken together being possibly non-leaky.
Claim 3
Dependent Claim
30 words
A method according to claim 1, wherein the amplitudes (dp n ) of the step reductions of the determined pressure are a function of the values of leakage pressure variation.
Claim 4
Dependent Claim
33 words
A method according to claim 1, wherein the amplitudes (dp n ) of the step reductions of the determined pressure are equal to a few thousandths of the value of said determined pressure.
Claim 5
Dependent Claim
17 words
A method according to claim 1, wherein said pressure reductions take place about once every four seconds.
Claim 6
Dependent Claim
17 words
A method according to claim 1, wherein the number of pressure reductions is substantially equal to seven.
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) | 1992-06-19 | 1992-12-19 | 1993-06-20 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1996-06-19 | 1996-12-19 | 1997-06-20 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2000-06-19 | 2000-12-19 | 2001-06-20 | $7700.00 | Window Closed / Lapsed |