US4123847A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Apparatus for measuring internal corrosion in pipelines
Assignee: Shell USA Inc
•
Filing: 1977-10-13
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Granted: 1978-11-07
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Expires: 1997-10-13
Abstract
Abstract An apparatus for measuring the internal corrosion in a pipeline consisting of a pig having a circumferential array of spring-loaded probes for measuring both the average diameter of the pipe and the depth of individual pits. The probes are disposed in pairs with one probe in the form of a stylus having a pointed end for measuring pits, and the other probe having a shoe-shaped end for measuring the average pipe diameter.
Inventors
- 👤 Hendrik Bosselaar
- 👤 Frank Oltmans
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-04 16:52
CPC Classifications
G; G01; G01N; G01N19/00; G01N19/08; G01B; G01B5/00; G01B5/08; G01B5/12; G01B5/28; G01B5/285; Y; Y10; Y10S; Y10S33/00; Y10S33/13
Claims Analysis
Total Claims: 4
Claim 1
Independent Claim
145 words
An apparatus for measuring both the average internal diameter of a pipeline and the depth of the individual pits, said apparatus comprising: a pipeline pig having at least one open section; a plurality of pairs of probes disposed around the periphery of said open section, each pair of probes having a shoe-shaped probe and a pointed-end probe disposed to project through an opening in the pipeline contacting surface of the shoe-shaped probe; a plurality of flat spring members disposed to support said probes both with respect to each other and said open section, said probes moving relative to each other in a radial direction; a plurality of strain gauges mounted on said flat spring members to measure the deflection of said spring members; and, a recording means carried by said pig and coupled to said strain gauges to record the deflection of said spring members.
Claim 2
Independent Claim
145 words
An apparatus for measuring both the average internal diameter of a pipeline and the depth of the individual pits, said apparatus comprising: a pipeline pig having at least one open section; a plurality of pairs of probes disposed around the periphery of said open section, each pair of probes having a shoe-shaped probe and a pointed-end probe disposed to project through an opening in the pipeline contacting surface of the shoe-shaped probe; a plurality of flat spring members disposed to support said probes both with respect to each other and said open section, said probes moving relative to each other in a radial direction; a plurality of strain gauges mounted on said flat spring members to measure the deflection of said spring members; and, a recording means carried by said pig and coupled to said strain gauges to record the deflection of said spring members.
Claim 3
Dependent Claim
104 words
The apparatus of claim 1 wherein said pointed-end probe is supported adjacent its pointed end by a first flat spring member disposed between the probe and said shoe-shaped probe, said pointed-end probe being supported adjacent its other end by a second flat spring member disposed between the pointed-end probe and said pig, said pointed-end probe being supported at an intermediate position by a third flat spring member disposed between the pointed-end probe and the shoe-shaped probe, and said shoe-shaped probe being supported adjacent the intermediate position on said pointed-end probe by a fourth flat spring member disposed between said shoe-shaped probe and said pig.
Claim 4
Dependent Claim
98 words
The apparatus of claim 1 wherein a fifth flat spring member is disposed below said second spring member, and having one end clamped to the pig to force the other end into contact with said pointed-end probe, a sixth flat spring member disposed between said second and third spring members, and having one end clamped to the shoe-shaped probe to force the other end into contact with said pointed-end probe; and a pair of strain gauges, one of said strain gauges being mounted on each of said fifth and sixth flat spring members to measure the deflection thereof.
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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) | 1981-11-06 | 1982-05-08 | 1982-11-07 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1985-11-06 | 1986-05-08 | 1986-11-07 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1989-11-06 | 1990-05-08 | 1990-11-07 | $7700.00 | Window Closed / Lapsed |