Weld Neck vs Slip On Flange: 7 Criteria That Decide Which to Specify (Cost, Pressure, NACE, Inspection) // Hebei Yajiada Engineering Notes

About the author

Ma Yajiada, Chief Engineer at Hebei Yajiada Import and Export Co., LTD. 20 years experience in flange metallurgy (Cangzhou, Hebei since 2006). Specializes in ASME B16.5 / B16.47 / EN 1092-1 standards and PED 2014/68/EU compliance.
B.Sc. Materials Engineering (Yanshan University); PED 2014/68/EU Module H Notified Body auditor; 20 years flange metallurgy specialization.

Editorial review: Ma Yajiada, PE. Article published 2026-08-24. Last updated 2026-07-28.

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18 years in flange manufacturing (since 2008) · 50,000 T/YR capacity
ISO 9001:2015 (00215Q20319R0M) since 2013
PED 2014/68/EU Module H (PED-2017-0042, TÜV Rheinland) since 2017
NACE MR0175 / ISO 15156 qualified for sour service
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