Taco PAX Series Potable Water Expansion Tank

Taco PAX Series Potable Water Expansion Tank

The brand TACO has forever been associated with highest quality products for heat circulation, air elimination and control and genera product line-ups of the best circulators, pumps, motors, heat transfer products and hydronic accessories. The TACO PAX series portable water expansion tank is another feather in the line-up of high efficiency products for air elimination and control manufactured under the TACO banner.

What is the TACO PAX series portable water expansion tank?

The water expansion tanks from TACO PAX series are bladder tanks that are useful in creating permanent separation functionality for air and water. The parts of the tanks that are supposed to be under wet conditions are made up of FDA – approved materials to ensure maximum warranty on security. The TACO PAX series portable water expansion tanks are available in 11 series models to sustain all kinds of portable water requirements for customers. Every tank launched under the banner is factory re-charged to exact job specifications to ensure that they have the optimum efficiency and safety for consumers. The tanks come with a removable Butyl Rubber bladder, which is a heavy-duty shell, constructed with 100% original stainless steel. The design construction follows the specifications set in ASME (VIII section Division 1).

Chef specifications of the TACO PAX series portable water expansion tanks

The TACO series is specifically known for its high quality standards. The PAX series expansion tanks are not bereft of this type of quality and efficiency, which is the trademark of the core brand. The root of this quality can be traced to the technical specifications of the PAX water expansion tanks. The specifications are exacting and upgraded to keep up with the changing hydronic systems and the increased need for energy conservation as well as high efficiency functionality.

• The TACO PAX series portable water expansion tanks are exclusively designed and exactingly composed based on the ASME code section VIII Division 1
• The main construction is comprised of high quality carbon steel with a red oxide primer used for a coating finish on the exterior of the expansion tanks,
• The standards pressure valued by the design stands at 150 psi. The maximum temperature specified according to the design is 240 degree Fahrenheit.
• The TACO PAX series portable water expansion tanks are registered products with the NBPVM (National Board of Pressure Vessel Manufacturers)
• The designs for the core tank are bladder shaped which increases efficiency of flawless permanent separation of the air and water in modern hydronic systems.
• The water expands inside the bladder while under the same functionality the air is collected in pre-charged fashion on the shell side of the tanks.
• The expansion tank bladders are made up of heavy-duty butyl compound.
• The bladder tank is removable to allow for easy inspection from time to time.
• The entire core system connections have been constructed of 304 stainless steel materials.
• The unique design of the TACO PAX 150 series portable water expansion tanks make them best suited for vertical or horizontal installation position. However the other series models (certified to NSF/ANSI 61 –G) under the PAX series need to be mounted specifically according to a vertical position. The installation should be placed along the cold-water side of the system of hot water heater.

The partial acceptance captive air expansion tanks from Taco PAX

The captive air expansion tanks from PAX find their applications in commercial, industrial and even institutional usage for maintaining control and pressure of air in most hydronic systems. He unique bladder shaped removable tanks allow for permanent separation of air and water in the systems. This permanent separation of air and water in the tank results in the pre charging of the airside of the expansion tanks. The air pressure drops down to the minimum operating pressure or the tank fill pressure. This allows the elimination of number of gallons of water that was primarily used for atmospheric pressure compression in steel tanks. This allows manufacturers to reduce the required tank sizes for the new age designs. In fact, eh PAX series Partial acceptance captive air expansion tanks are almost 80% smaller compared the older models of air cushion or steel tanks.

Unique features of the captive air expansion tanks from TACO PAX series

The TACO PAX series portable water expansion tanks are 80% smaller than the regular steel tanks. Also unlike the air cushion type tanks and steel tanks of earlier models, the modern AX series tanks do not have the bladder attached along the tank wall much in the design of a diaphragm tank. Instead, the bladder sits at the bottom of the expansion tank to facilitate an internal assembly connection to the main stainless steel system that is located at the top of the tank design.

In case of the TACO PAX series, the partial acceptance bladder is designed to operate like a normal balloon. In order to maintain absolute functionality the bladder acceptance volume and total tank volume has to be completely at par to ensure acceptance of the volume of net system expansion. This acceptance has to be in a way to not exceed the specifications on pressure limitations for the core system design. The bladder remains of limited acceptance volume so it does not stretch in case of partial acceptance ladder tanks.

TACO also offers a selection app to facilitate the selection of the many types of styles of the tanks. The expanded water is allowed to flow into the interior of the bladder. Te pre-charged air remains outside the bladder cushioned between the bladder wall and the tank wall. This ensures that the tank wall is never in contact with water. This prevents corrosion risks and increases the durability of the tanks.

The PAX series from TACO is available in the 150 series and also a different series that comes with a certification under NSF/ANSI 6-G through P.

Some considerations during installation of the TACO PAX series portable water expansion tanks

• Before connecting the expansion tank to the hydronic system, make sure to adjust the pre-charge air pressure within the tank to equal the specified minimum system pressure for the tank location. The measurement for this pressure should be calculated at the air valve, which is placed at the top of the tank.
• The expansion tanks have an initial pre-charge of 40 psi at 68 degree when in factory condition. However, the ambient temperature of the location might lead to slight variations in these calculations.
• Always ensure that the fill pressure for the tanks are noted in the job specifications or the schedule ledgers on site.
• The design engineer should specify the proper calculations for fill pressure values if the specifications are not already mentioned in the official ledgers. Any miscalculations during these pre-installation adjustments of the pre-charge will lead to incorrect installation settings for the tank. Do not install the tanks without taking care of the mentioned adjustments.
• Te piping requirements specified for plain steel expansion tanks have been upgraded completely for captive air tanks. The piping and process of adjusting the air elimination devices should be coordinated to ensure that no air is trapped within or above the tank. This is essential to avoid any risks of accidents or improper installations. Always pitch the piping upwards and away from the main tank to ensure safety. Always use the automated air vents wherever applicable.