Minnesota Administrative Rules

5230.5007 CHAPTER 15, OVERPRESSURE PROTECTION DEVICES.

Subpart 1.

Chapter 15.2.7.

ANSI/IIAR 2, chapter 15.2.7, is amended to read as follows:

15.2.7. Relief valves shall not be located in refrigerated spaces unless precautions are taken to prevent moisture migration into the valve body or relief valve vent line. A drip pocket the size of the discharge pipe and at least 24 inches in length must be installed below a vertical riser in the discharge pipe and must be fitted with a drain plug or valve.

Subp. 2.

Chapter 15.2.8.2.

ANSI/IIAR 2, chapter 15.2.8.2, is amended by adding the following paragraph at the end:

Rupture discs may only be used when installed in series with a pressure relief valve.

Subp. 3.

Chapter 15.3.3.

ANSI/IIAR 2, chapter 15.3.3, is amended by adding a subsection as follows:

15.3.3.1. Where the refrigerant inlet and outlet of air-cooled or evaporative condensers can be isolated, they shall be equipped with overpressure protection.

Subp. 4.

Chapter 15.4.3.

ANSI/IIAR 2, chapter 15.4.3, is amended to read as follows:

15.4.3. The discharge piping from pressure relieving devices to atmosphere shall be a minimum schedule 40 steel for all pipe sizes.

Statutory Authority:

MS s 326B.925

History:

34 SR 145; 39 SR 1343; 42 SR 1423; 47 SR 741

Published Electronically:

October 31, 2023