ASME/BPVC - CASE N-705
N-705 Evaluation Criteria for Temporary Acceptance of Degradation in Moderate Energy Class 2 or 3 Vessels and Tanks Section XI, Division 1 Supp 4
| Organization: | ASME/BPVC |
| Publication Date: | 1 January 2007 |
| Status: | inactive |
| Page Count: | 5 |
scope:
(a) The provisions of this Case apply to vessels and tanks, including heat exchangers, classified by the Owner as Class 2 or 3, and whose maximum operating temperature does not exceed 200°F (93°C) and whose maximum operating pressure does not exceed 275 psig (1.9 MPa).
(b) The provisions of this Case define the requirements to demonstrate the structural integrity of the vessel or tank but not the consequences of leakage. The Owner shall determine what constitutes acceptable leakage, evaluate the consequences of leakage, and determine system operability.
(c) The provisions of this Case provide procedures and criteria for evaluating failure conditions for fracture and overpressure (blowout). The Owner shall verify that other potential failure modes are not relevant for the observed degradation (e.g., buckling).
(d) The evaluation period is the operational time for which the temporary acceptance criteria are satisfied (i.e., evaluation period ≤ Tallow), but not greater than 26 months from the initial discovery of the condition.
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