https://hbyagada.com Engineering notes on ASME B16.5, EN 1092-1, JIS B2220, ISIRI 9117 flange standards. Material selection for oil & gas, petrochemical, LNG, cryogenic service. en-US Thu, 23 Jul 2026 10:45:00 +0800 https://hbyagada.com/blog/asme-b165-vs-en-1092 Side-by-side comparison of pressure class, facing type, dimensional coverage, and bolt-up interchangeability. Helps procurement teams pick the right standard for Middle East EPC projects. Thu, 23 Jul 2026 10:45:00 +0800 Standards asme-b165-vs-en-1092-2026-07-23 https://hbyagada.com/blog/nace-mr0175-sour-service ANSI/NACE MR0175/ISO 15156 is a material specification, not a product certificate. Hardness limits (HRC 22) for A105 / LF2 / WCB in H2S-containing oil & gas service. Thu, 23 Jul 2026 10:30:00 +0800 Materials nace-mr0175-2026-07-23 https://hbyagada.com/blog/isiri-9117-iran-import Iran Customs EPL three-path system for flange imports. Order Registration + CBI currency allocation + INSO third-party inspection certificate (SGS / TÜV / Intertek / BV). Thu, 23 Jul 2026 10:15:00 +0800 Compliance isiri-9117-2026-07-23 https://hbyagada.com/blog/16mndr-lng-cryogenic GB 3531 16MnDR is rated for -40°C (NOT -46°C). Normalize + temper heat treatment, post-weld SR stress relief, equivalence with ASTM A350 LF2. Thu, 23 Jul 2026 10:00:00 +0800 Cryogenic 16mndr-lng-2026-07-23