It is for this reason emphasis must be placed on the avoidance of the trapping of liquid.
The expansion rate of R-744 is nearly double that of standard refrigerants.
CSA B52 MECHANICAL REFRIGERATION CODE PDF UPDATE
Many of the changes along with an explanation are as follows: a) Clause 3 has been updated to add the following definitions: i) automated control ii) fade-out vessel iii) gas cooler iv) manual control v) pressure-regulating relief valve vi) primary refrigerant vii) secondary refrigerant viii) subcritical ix) subcritical system x) systems xi) supercritical xii) thermal relief device (or thermal expansion relief device) xiii) transcritical system and xiv) triple point b) Updates to Clause 4.3.1.2.3: This Clause provides explanations and figures of the various system types with reference to the evaporator containing refrigerant being in contact with the occupied space c) Updates to Clauses 5.5.1, 5.6, 5.7.1, and 5.8.1 and the addition of Clause 5.9.2.1c): As R-744 carbon dioxide is becoming a major refrigerant within refrigeration and heat pump systems, the CSA B52 committee has gone to extensive measures to provide the most up-to-date minimum safety requirements as can be found within some of these clauses d) The addition of a note to Clause 6.3 and an update to Clause 6.3d) e) Updates to Clauses 7.2.2.1 and the addition of Clause 7.2.2.4: Further changes attributed to the reintroduction of R-744 f) Updates to Clause 7.2.3 to include i) renumbering of Clauses 7.2.3.1.1, 7.2.3.1.2, and 7.2.3.3 of the 2005 edition and ii) the addition of Clauses 7.2.3.2, 7.2.3.2.1, and 7.2.3.2.2 g) Updates to Clause 7.2.4: R-744’s physical properties demonstrate that it has pressures higher than standard refrigeration components pressure ratings. 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. 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. Changes in the CSA B52-13 Standard are reflected in this edition of the handbook. 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.
The B52 Code, which originated in 1939, has been regularly updated throughout the years and is now in its eleventh edition. 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. Preface This is the second edition of CSA B52 HB, A practical handbook for implementing CSA B52-13, Mechanical refrigeration code.
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