How to determine the proportion of radiographic inspection for liquid ammonia pipelines
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Experienced users who have prior experience, please come and discuss how to determine the proportion of radiographic testing for liquid ammonia pipelines
Radiographic inspection of pressure pipeline welds can be divided into two types proportionally: full inspection and random sampling inspection. Pipelines subject to 100% proportion flaw detection: P refers to the design pressure, and T refers to the design temperature. 1. Pipelines for highly toxic fluids ； 2.P≥10MPa ； Or flammable fluids and toxic pipelines with P≥4MPa and T≥400℃ ； 3. P≥10MPa and T≥400℃ for non-flammable and non-toxic fluid pipelines ； 4. Low-temperature pipelines with T less than -29°C ； 5. The design documents require 100% flaw detection for the pipelines. Check if the design documents specify anything
If it’s not ammonia-based refrigeration, 10% is sufficient
What about liquid ammonia used for denitration in thermal power plants?
“Guiding Opinions of the Special Equipment Bureau of the General Administration of Quality Supervision, Inspection and Quarantine on the Special Campaign to Regulate Special Equipment Used in Ammonia Refrigeration Systems”, 100% for refrigeration