The Single Check and Single Detector Check Valve Assembly backflow preventer protects against backflow by either back-pressure or back-siphonage from a cross-connection between potable water systems and substances in ‘low hazard’ conditions in fire sprinkler systems.

The proper air-side charge is equal to the static pressure of the fluid at the inlet of the tank, plus an additional 5.0 PSI allowance for the pressure at the top of the system. The air side of the tank should be checked and adjusted before adding water to the system. If the tank is already installed and the system has pressure in it, the pressure should be drained at the tank to 0 PSI before testing the pressure on the tank.

Expansion tanksizing formula

Watts Regulator Repair Kit Complete Rubber Part 1 Inch 0887787 for 009 Series Reduced Pressure Zone Assemblies.

tekmar Control Systems. tekmar products are designed for a wide range of temperature control applications including heating and cooling system control, zoning, ...

Expansion tank pressure calculatormetric

In this enlightening episode, we sit down with Mike, a 20-year veteran from DITEK, a leading American manufacturer of surge protection devices based in Largo, Florida. The conversation begins with a brief discussion about recent hurricane impacts in the Tampa Bay area, where DITEK maintains its 65,000-square-foot manufacturing facility. Mike shares how the company, despite facing challenging weather conditions, continued its operations and maintained its commitment to American manufacturing.

Quickly and efficiently clean and sterilize racks of dishes, glassware, pots and pans, and utensils with the Hobart Stero SD3-2 Door-Type Dishwasher with ...

As the area's longest serving family funeral home, we have the experience and flexibility to exceed your expectations.

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LF800M4QT 1 ; AdditionalTradeItemDescription_en-US, 1 IN Lead Free Anti-Siphon Pressure Vacuum Breaker Backflow Preventer, Quarter Turn Shutoff, Tee Handles.

Michael Housh from Housh Home Energy in Ohio wrote this tip to help techs determine the air-side charge on a pressure tank. Thanks, Michael!

Below is a graph that shows us this rule of thumb equation and the required air-side pressure based on the height of the system piping.

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Expansion tanksizing rule of thumb

Determining the air-side charge of an expansion tank in a hydronic heating system is a relatively easy task.  A properly sized and charged tank is designed to keep the system pressure about 5.0 PSI lower than the pressure relief while the system is at maximum operating temperature.

Substituting ‘Dc’ into the original equation would give us a slightly less complicated equation that can be used as a rule of thumb to solve for the air-side pressure.

Expansion tank pressure calculatorpdf

The episode also addresses common misconceptions about surge protection, particularly the belief that surge protectors are primarily for lightning protection. Mike explains that while lightning strikes are a concern, especially in areas like Florida, approximately 65% of surges actually originate from within facilities themselves, often from equipment cycling on and off or other power quality issues. He emphasizes the importance of proper installation, particularly regarding ground connections and lead lengths, noting that every six inches of wire length can add about 100 volts to the clamping voltage of the device.

Sewerage is what sewage runs through - the pipes, treatment facilities and pumping stations that both collect and treat sewage. It is also what can get blocked!

Purchase your tickets or learn more about the 6th Annual HVACR Training Symposium at https://hvacrschool.com/symposium. Subscribe to our podcast on your iPhone or Android.   Subscribe to our YouTube channel.  Check out our handy calculators here or on the HVAC School Mobile App for Apple and Android.

Expansion tanksizingcalculatormetric

Sizes shown are for fin-tubed baseboard radiation. For systems with converters and/or unit heaters, increase tank one size. For cast-iron radiation, increase.

Looking for WATTS, 774, Double Check Detector Assembly? Find it at Grainger.com®. With over one million products and 24/7 customer service we have supplies ...

Expansion tanksizing Chart

A lot of the “rule of thumb” equations for hydronic systems are based on the density of water @60°F is 62.37, so we could simplify the above equation into a rule of thumb equation by first solving for the density (Dc). (Note: the formulas that we use in hydronic system GPM calculation also use the 60°F baseline. We have published an article about hydronic system GPM calculations, which you can read HERE.)

The formula for calculating the air-side pressure is relatively easy and directly related to the highest point in the system from the inlet of the expansion tank.

Real training for HVAC ( Heating, Ventilation, Air Conditioning and Refrigeration) Technicians. Including recorded tech training, interviews, diagnostics and general conversations about the trade.

Have a question that you want us to answer on the podcast? Submit your questions at https://www.speakpipe.com/hvacschool.

The bulk of the discussion centers around surge protection technology and its critical importance in protecting HVAC systems and other electronic equipment. Mike provides an excellent analogy, comparing surge protectors to pressure relief valves for electrical systems. He explains how Metal Oxide Varistors (MOVs) work as semiconductors that create low impedance paths to ground when voltage exceeds certain thresholds. The conversation delves into the evolution of MOV technology, particularly the development of thermally protected MOVs that provide enhanced safety features.

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