ICS 75.160.30 CCS E 30 中华人民共和国石油化工行业标准 NB/SH/T 0233—2024 代替 SH/T 0233 —1992 液化石油气采样法 Method of sampling for liquefied petroleum gas 2024-12-25发布 2025-06-25实施 NB/SH/T 0233—2024 I 目 次 前言 ······························································································································I I 1 范 围 ························································································································· 1 2 规范性引用文件 ·········································································································· 1 3 术语和定义 ················································································································ 1 4 方法概要 ··················································································································· 1 5 采得代表性样品的注意事项 ··························································································· 2 6 安全事项 ··················································································································· 2 6.1 通用要求 ·············································································································· 2 6.2 采样点的安全 ········································································································ 2 6.3 采样瓶的安全 ········································································································ 2 6.4 运输安全 ·············································································································· 3 7 采样设备 ··················································································································· 3 7.1 采样瓶 ················································································································· 3 7.2 采样管 ················································································································· 4 7.3 采样瓶连接件 ········································································································ 4 7.4 密闭采样系统 ········································································································ 4 7.5 自动采样系统 ········································································································ 4 8 采样瓶的准备 ············································································································· 5 9 采样步骤 ··················································································································· 5 9.1 通则 ···················································································································· 5 9.2 自动采样 ·············································································································· 6 9.3 手工采样 ·············································································································· 6 9.4 调整采样量 ··········································································································· 7 9.5 泄漏检查 ·············································································································· 7 附录 A（资料性） 本文件与 ISO 4257:2001 相比的结构变化情况 ············································· 8 附录 B（资料性） 一种密闭系统的采样示例 ········································································ 9 参考文献 ·······················································································································11 NB/SH/T 0233—2024 II 前 言 本文件按照 GB/T 1.1 —2020《标准化工作导则 第1部分：标准化文件的结构和起草规则》的规定 起草。 本文件代替 SH/T 0233 —1992《液化石油气采样法》，与 SH/T 0233 —1992相比，除结构调整和编 辑性改动外，主要技术变化如下： a） 增加了适用界限的内容“本文件不适用于为 LPG中低沸点组分的痕量分析提供样品”（见第 1章）； b） 更改了“采得代表性样品的注意事项”（见第 5章， 1992年版的 5.1、5.2）； c） 更改了“安全事项”（见第 6章， 1992年版的 5.3）； d） 更改了采样瓶的选择形式（见 7.1，1992年版的 4.1）； e） 更改了采样管的选择形式（见 7.2，1992年版的 4.2）； f） 增加了采样设备“密闭采样系统”（见 7.4）； g） 增加了采样设备“自动采样系统”（见 7.5）； h） 更改了“采样瓶的准备”，细化了采样瓶清洗步骤（见第 8章， 1992年版的 6.1）； i） 删除了单阀型采样瓶的冲洗（见 1992年