前言:这是CSA B52HB的第三版，这是一本实施CSA B52:18《机械制冷规范》的实用手册。它取代了2016年和2005年出版的之前版本。本手册的主要目的是为CSA B52的新手和经验丰富的用户提供一个简明、用户友好的指南，以了解和实施CSA B52的要求。B52代码起源于1939年，多年来一直在定期更新，现在是第十二版。本手册还简要介绍了CSA B52的发展，涉及代码？公司的发展过程、更新和解释，以及《准则》和司法法规之间的关系。 本版手册反映了CSA B52:18标准的变化。由于社会一直倡导改变天然制冷剂以保护环境，因此有许多安全问题必须解决。本版CSA B52手册将提供许多建议的最低安全协议，以避免出现问题。许多变化和解释如下:B52技术委员会的成员也为其发展做出了贡献。CSA集团衷心感谢伊恩·弗罗斯特和克雷格·麦克唐纳在本手册编写过程中所做的工作。 氨扩散罐上的材料由James Shou慷慨提供。机械制冷规范技术委员会也为本手册的编制做出了贡献。CSA B52的范围:CSA B52的范围是按照省和地区法案的规定，为所有机械制冷系统的设计、施工、安装、检查和维护提供最低要求，以将人身伤害风险降至最低。本规范适用于在其管辖范围内采用后安装的所有制冷系统，无论是在新的或现有的场所中，也适用于经过制冷剂替代的系统，以及在采用之前安装的制冷系统中更换或添加的制冷系统部件。 “收养”一词指的是一个司法管辖区采用该准则的日期，而不一定指该准则发布的年份。

Preface:This is the third edition of CSA B52HB,A practical handbook for implementing CSA B52:18, Mechanical refrigeration code. It supersedes the previous editions published in 2016 and 2005.The primary objective of this Handbook is to provide both novice and experienced users of CSA B52 with a concise, user-friendly guide to understanding and implementing the requirements of CSA B52. The B52 Code, which originated in 1939, has been regularly updated throughout the years and is now in its twelfth edition. This Handbook also briefly describes the evolution of CSA B52, touching on the Code?s development process, updates and interpretations, and the relationship between the Code and jurisdictional regulations.Changes in the CSA B52:18 Standard are reflected in this edition of the Handbook.As society has been advocating the change to natural refrigerants in order to preserve the environment, there are many safety issues which must be addressed. This version of the CSA B52 Handbook will provide many of the recommended minimum safety protocols to be adhered to, in order to avoid issues. Many of the changes along with an explanation are as follows: Members of the B52 Technical Committee also contributed to its development.CSA Group gratefully acknowledges the work of Ian Frost and Craig MacDonald in the development of this Handbook. Material on ammonia diffusion tanks was generously provided by James Shou. The Technical Committee on the Mechanical Refrigeration Code also contributed to the development of this Handbook.Scope of CSA B52:The scope of CSA B52 is to provide minimum requirements for the design, construction, installation, inspection, and maintenance of all mechanical refrigeration systems, as provided for by provincial and territorial acts, to minimize the risk of human injury. The Code applies to all refrigeration systems installed subsequent to its jurisdictional adoption, whether in new or existing premises, to systems that undergo a substitution of refrigerant, and to parts of a refrigeration system that are replaced in, or added to, refrigeration systems installed prior to its adoption. The word "adoption" refers to the date a jurisdiction adopts the Code, and not necessarily to the year in which the Code was published.