Patent US4332402A successfully refreshed from Google Patents.
US3571908A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Pipeline welding
Assignee: L-Tec Co
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Filing: 1969-02-19
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Granted: 1971-03-23
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Expires: 1989-02-19
Abstract
Abstract A method for eliminating diameter mismatch between pipe sections to be welded by clamping the sections to be welded in a preheated clamp to cause expansion of the pipe sections to the inside diameter of the clamp. The clamp is designed to be stronger than the pipe sections to prevent overexpansion thereof.
Inventors
- 👤 Frank Joseph Pilia
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-25 03:47
CPC Classifications
B; B23; B23K; B23K37/00; B23K37/04; B23K37/053; B23K37/0533; Y; Y10; Y10T; Y10T29/00; Y10T29/49; Y10T29/49826; Y10T29/49895
Claims Analysis
Total Claims: 5
Claim 1
Independent Claim
75 words
A method for eliminating diameter mismatch between pipe sections to be welded comprising: bringing the sections to be welded together to form a joint; placing a preheated lineup clamp around the outside of the pipe sections to be welded to transfer heat to said pipe sections; and permitting the heated pipe sections to expand to meet the clamp diameter thereby eliminating any differences in diameter of the pipe sections an and assuring weld joint alignment.
Claim 2
Independent Claim
75 words
A method for eliminating diameter mismatch between pipe sections to be welded comprising: bringing the sections to be welded together to form a joint; placing a preheated lineup clamp around the outside of the pipe sections to be welded to transfer heat to said pipe sections; and permitting the heated pipe sections to expand to meet the clamp diameter thereby eliminating any differences in diameter of the pipe sections an and assuring weld joint alignment.
Claim 3
Independent Claim
123 words
A method for field welding a pipeline circumferential joint Formed between two sections of pipe having a diameter of at least 24 inches comprising: bringing the sections to be welded together to form a joint; placing a preheated lineup clamp around the outside of the pipe sections to be welded to transfer heat to said pipe section; permitting the heated pipe sections to expand to meet the clamp diameter thereby eliminating any differences in diameter of the pipe sections and assuring weld joint alignment; entering the pipe sections and moving to the joint to be welded; and welding the pipe sections at the joint from the inside of said pipe sections whereby the root pass is placed at the outside of the pipe.
Claim 4
Independent Claim
123 words
A method for field welding a pipeline circumferential joint Formed between two sections of pipe having a diameter of at least 24 inches comprising: bringing the sections to be welded together to form a joint; placing a preheated lineup clamp around the outside of the pipe sections to be welded to transfer heat to said pipe section; permitting the heated pipe sections to expand to meet the clamp diameter thereby eliminating any differences in diameter of the pipe sections and assuring weld joint alignment; entering the pipe sections and moving to the joint to be welded; and welding the pipe sections at the joint from the inside of said pipe sections whereby the root pass is placed at the outside of the pipe.
Claim 5
Dependent Claim
15 words
Method according to claim 2 wherein said clamp is preheated to at least 600* F.
References Cited (Backward Citations)
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Cited
US2399815A
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US2959661A
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US3414950A
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US3512229A
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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) | 1974-03-22 | 1974-09-21 | 1975-03-23 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1978-03-22 | 1978-09-21 | 1979-03-23 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1982-03-22 | 1982-09-21 | 1983-03-23 | $7700.00 | Window Closed / Lapsed |