Procedure improves line pipe Charpy test interpretation
- Kiefner and Associates Inc., Worthington, OH (United States)
The Charpy V-notch (CVN) impact test is a method of characterizing a line-pipe material`s notch toughness and resistance to fracture growth. Although CVN testing of line pipe material is routine, test results are sometimes misinterpreted because of specimen size and load rate on actual toughness transition behavior. These effects are readily accounted for by a simple mathematical procedure, offered here, which enables extrapolation of the full-scale transition curve from as little as a single subsize specimen test. This procedure is useful when the toughness transition curve is incomplete or nonexistent. Toughness data may be incomplete because the API 5L toughness test establishes minimum performance at a single temperature, which does not reveal the full transition curve. Toughness data may be nonexistent because the first requirements for toughness testing of line pipe appeared in the 16th Edition of API 5LX in 1969, and those requirements remain at the option of the purchaser today.
- OSTI ID:
- 465127
- Journal Information:
- Oil and Gas Journal, Vol. 95, Issue 15; Other Information: PBD: 14 Apr 1997
- Country of Publication:
- United States
- Language:
- English
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