Finned Tubular Heater Factory Batch Test & Quality Control Sampling Plan

Finned tubular heater factory QC includes 100% full test for each finished tube plus periodic batch sampling destructive test. Finned tubular heater 100% online test items: cold resistance, insulation resistance, high voltage withstand test, visual and dimension inspection. Finned tubular heater destructive sampling test: thermal shock cycling, vibration test, pull-out test of terminal, accelerated aging test. Finned tubular heater sampling plan: AQL 0.65 for critical safety parameters, AQL 2.5 for appearance and dimensional tolerances. Chuanli Cold Storage Electric Defrosting Tubes implements full traceability for each batch; each heater marked with batch number and serial number. Finned tubular heater batch rejection rule: if any destructive sample fails, double sampling; if re-sample fails, reject entire production batch. Finned tubular heater batch environmental test: place sample in high humidity chamber 85°C / 85%RH for 96h then recheck insulation resistance. Finned tubular heater raw material incoming QC: MgO powder, stainless tube, resistance wire, fin strip tested before production release. Finned tubular heater test data stored for minimum 5 years, including batch report, test curve and inspection photos. Finned tubular heater batch quality control combines full non-destructive test and periodic destructive sampling to stabilize product reliability.

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FAQs Q: What AQL level for critical safety parameters? A: AQL 0.65. Q: What AQL level for appearance and dimension? A: AQL 2.5. Q: What high humidity aging test condition? A: 85°C /85%RH for 96 hours. Q: What 100% online non-destructive test items? A: Cold resistance, insulation resistance, high voltage withstand, visual & dimension check. Q: What happens if destructive sample fails? A: Double sampling; second failure leads to full batch rejection. Q: How long test records shall be retained? A: Minimum 5 years. Q: What destructive sampling tests are performed? A: Thermal shock, vibration, terminal pull-out, accelerated aging.