Home / Standards / GB/T 21446-2025 GB/T 21446-2025 Active Measurement of natural gas flow by means of standardized orifice meter 用标准孔板流量计测量天然气流量 Standard Type GBT ICS 75.180.30 CCS E98 Status 现行 Issue Date 2025-10-05 Implementation 2026-05-01 Responsible Dept 国家标准委 Drafting Unit N/A