Page 57 - Climate Control News Dec-Jan 21

Right sizing safety device systems
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Standards have been amended for safety device systems.
of allowing replacement of individual valves, without shutting down the system for mainte- nance. It is imperative
that this valve has very low dynamic pressure drop and is matched with the Safety valve capacity to prevent choking of the valve.
Henry Technologies is a leading manufacturer and supplier of refrigeration components, with an emphasis on oil management, pressure ves- sels and safety devices. With manufacturing fa- cilities and operating subsidiaries in the USA, UK, Australia, China & Singapore, Henry Tech- nologies markets its products globally to leading OEM’s, wholesalers and contractors.
Visit:www.henry-group.net ✺
AS PART OF the suite of standards replacing Australian Standard AS1677, some key changes have come about with the introduction of AS/ NZS 5149.2. Julian Parker, executive VP of opera- tions for Henry Technologies, explains the amendments with safety device systems.
The focus is as much on refrigeration contain- ment and reporting releases, as it is on protec- tion for over pressure. Safety device system se- lection is based on the energy contained in the system which could be released catastrophically in a fire or other over pressure situation; there- fore it is critical to get the sizing and application of the safety device system correct.
A typical safety device system compliant to AS/NZS 5149.2 consists of the following devices: Rupture Disc: Comprising a hermetically sealed
membrane within a body which is threaded to at- tach to a system and accept a safety device. The rupture disc will burst at a predetermined pressure, equal to the set pressure of the safety valve setting; it will also contain an access port to accept a tell-tale gauge, or pressure sensor to indicate discharge pres- sure has been reached. A good quality product will ensure no nuisance emissions and lost gas, whilst protecting the system from over pressure.
Safety Valve: An automatic mechanical device which lifts and discharges a specified volumetric flow rate at the set pressure stamped on the valve body. It should be correctly sized for the energy contained within the system to be protected. Safe- ty valves may be ASME Section VIII div 1 or CE compliant, but must comply with AS/NZS 1200.
Three Way Valve: A change over valve capable
Compact 3-way Valve & PRV Assembly
933 & 935 VALVES DESIGNED TO COMPLIMENT THE HENRY 5700 & 5701AX PRESSURE RELIEF VALVES
•SuitableforHCFC,HFC,HFO,CO andR290 2
AD?
refrigerants and associated oils
• Maximum working pressure 130 BARG
• Allowable operating temperature -40°C to + 150°C • High flow capacity
• Rotatable ball to guide flow
• Fully adjustable rotalock-style inlet and outlet connections available for ease of orientation during installation
www.henry-group.net
INTELLIGENT MANUFACTURING. INTELLEGENT PRODUCTS.
CLIMATE CONTROL NEWS DECEMBER 2020 - JANUARY 2021
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