Document: 10 CFR Part 50
Document ID: cfc9c7b0-bbcd-4774-97ce-900cbc760408
Document Type: cfr
Title: Codes and standards.
Source: 10 CFR Part 50
Source URL: https://www.ecfr.gov/current/title-10/part-50/section-50.55a
Revision Date: 
Chapter: 
Section ID: 50.55a
CFR Part: 50
CFR Title: 10

Content:
ber to be fused. ( 3 ) PE Material: Each lot of polyethylene source material to be used in production (XXVI-2310(c)). ( 4 ) Wall Thickness: Each thickness to be fused in production (XXVI-2310(c)). ( 5 ) Diameter: Each diameter to be fused in production (XXVI-2310(c)). ( 6 ) Cross-sectional Area: Each combination of thickness and diameter (XXVI-2310(c)). ( 7 ) Position: Maximum machine carriage slope when greater than 20 degrees from horizontal (XXVI-4321(c)). ( 8 ) Heater Surface Temperature: A change in the heater surface temperature to a value beyond the range tested (XXVI-2321). ( 9 ) Ambient Temperature: A change in ambient temperature to less than 50 °F (10 °C) or greater than 125 °F (52 °C) (XXVI-4412(b)). ( 10 ) Interfacial Pressure: A change in interfacial pressure to a value beyond the range tested (XXVI-2321). ( 11 ) Decrease in Melt Bead Width: A decrease in melt bead size from that qualified. ( 12 ) Increase in Heater Removal Time: An increase in heater plate removal time from that qualified. ( 13 ) Decrease in Cool-down Time: A decrease in the cooling time at pressure from that qualified. ( 14 ) Fusing Machine Carriage Model: A change in the fusing machine carriage model from that tested (XXVI-2310(d)). ( B ) Mandatory Appendix XXVI: Second provision. When performing procedure qualification for high speed tensile impact testing of butt fusion joints in accordance with XXVI-2300 or XXVI-4330 of the 2015 through 2021 Editions of BPV Code Section III, breaks in the specimen that are away from the fusion zone require the test plot yield strength to be evaluated to confirm sound base material. If the base material failed (broke) at less than minimum required base material yield strength, a retest is required. ( C ) Mandatory Appendix XXVI: Third provision. When performing fusing procedure qualification tests in accordance with 2017 Edition of BPV Code Section III XXVI-2300 and XXVI-4330, the following essential variables must be used for the testing of