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How To: Understand Data Tags

How To: Understand Data Tags

Every pressure vessel manufactured by Wessels Company is equipped with a metal data tag affixed to its front side, positioned below the smart bracket system. This data tag serves as a quick reference for essential vessel information.

All vessels that adhere to the ASME code have a corresponding U stamp on the tag. You can learn more about the ASME code and Wessels’s certification here: Wessels and ASME Specification | Wessels Company (

Each vessel that adheres to the ASME code is also given a specific National Board number, which is the manufacturing organization’s sequential identifier for a specific pressure-retaining item so it can be tracked. The number circled is either a five- or six-digit number, found in the upper right corner of the data tag. Maintenance engineers can use the National Board number as a reference for technical support or warranty information.

Crucial operational parameters such as maximum and minimum working pressures and temperatures are prominently featured on the tag. These values are denoted as Maximum Allowable Working Pressure (MAWP) and Minimum Design Metal Temperature (MDMT), respectively. For instance, the specified MAWP for this vessel is 200 pounds per square inch (psi), accompanied by a maximum working temperature of 240°F.

Additionally, the tag includes the manufacturing year, affirming its origin in the United States. H.D. denotes Head Dimension, indicating the size of the vessel’s top, while SH signifies the shell thickness or steel gauge employed in its construction.

In the lower left corner of the tag you can find the CRN (Canadian Registration Number), a mandatory identifier for vessels intended for installation and registration within Canada. Meanwhile, the tank type is often delineated on the lower right side; for example, this particular vessel is identified as a 35-gallon expansion tank.

The name of the manufacturer can also be found on the tag, and in this case, the manufacturer is Wessels Company. For more information about data tags, you can call our warehouse at 317-888-9800 or watch this short video.

February Employee Spotlight

February Employee Spotlight

We are pleased to introduce our new Operations Manager, Kevin Smith, who joined our team at the beginning of 2024. Kevin graduated from Indiana Wesleyan University in 2003 with an associate degree in Business Management. He highlights his coworkers as his favorite part of working at Wessels. Beyond his professional endeavors, Kevin pursues outdoor hobbies such as hiking, kayaking, and camping, alongside his passion for woodworking. He treasures quality time spent with loved ones, including his family, friends, and three rescue cats: Cuddles, Pokie, and Tiger. Kevin learned to play the card game Euchre when he was only 9 years old and has been playing in a monthly Euchre club for 30 years! Wessels extends a warm welcome to Kevin as he embarks on this new role.

Kevin fast facts:
Favorite color: Green
Favorite food: Tenderloin
Likes: Spending time with friends & family

Kevin Smith
Operations Manager
E-mail: [email protected]
Phone: 317-888-9800 ext: 1027

Drum Mounted GMP Debuts at AHR 2024

Drum Mounted GMP Debuts at AHR 2024


January 2024
Contact: Rebecca Bennett- Marketing Coordinator
[email protected]
For Immediate Release


Wessels Unveils Innovative Product Enhancements at AHR Expo 2024

GREENWOOD, IND. – Wessels Company is thrilled to announce the debut of its latest product enhancements at the AHR Expo in Chicago, showcased at booth 6321. Among the highlights is the new Drum Mounted Glycol Makeup Package, known as DM-GMP, featuring enhanced mobility and refill capabilities. The system ingeniously mounts atop a standard drum containing glycol or glycol mixture, streamlining the refill and installation process.

The DM-GMP unit is designed to automatically supply a pressurized solution, such as glycol and water, to a closed loop heating, chilled water, snowmelt, radiant heating, sprinkler, or process control system to ensure minimum system pressure requirements are met. These systems are equipped with HOA controls, an adjustable pressure reducing valve (PRV), pressure gauge, and a low-level alarm that cuts power to the pump and actuates an audible and visual alarm when solution levels are too low.

In addition to these advancements, the industry-leading smart bracket technology has undergone a redesign to be more compact and resilient. The WessView® bladder monitor, air pressure gauge, and Schrader valve have all been optimized to snugly fit the exterior of the tank with a single connection. The ASME tank and smart system seamlessly integrate all essential technologies into a convenient location. The new smart bracket will become a standard feature on all bladder-style tanks later this year.

For more information on the DM-GMP, download the new brochure and submittal.

About Wessels Company:

Wessels Company is a leading innovator in the design and manufacture of cutting-edge solutions for fluid control systems. With a commitment to excellence, Wessels continues to redefine industry standards through its dedication to quality, performance, and customer satisfaction. For more information, visit


2024 Pricing Increase Notice

2024 Pricing Increase Notice

NOTICE: January 2024 List Prices will see a roughly 5% increase (cumulative)

The new year is approaching, which means work on the 2024 list price catalog has begun. Wessels Company remains dedicated to offering competitive pricing for our wide range of product offerings.

If you have not done so yet, we highly recommend ordering from our online platform where you will receive a 3% discount to help offset the new price increases. is easy to use and was recently updated to include order status and tracking information. Learn more

Official Memorandum:

Employee Spotlight

Employee Spotlight

We happily introduce the newest smiling face to the Wessels family, Allyson McQueen! She joined our engineering department at the beginning of November as a Process Engineer. She loves learning new things, which will surely benefit her in her new role on our engineering team. Allyson is an avid sports fan and has many teams she roots for including the Florida Gators, Atlanta Braves, Miami Dolphins, and the L.A. Lakers. She is a dog lover and has a large German Shepherd who she loves to spoil. In her free time, she can be found training large dogs and playing darts around the country in tournaments.

Allyson fast facts:
Favorite color: Orange
Favorite food: Smoked Brisket
Likes: motorcycle riding, sports, spending time with family

🛒 Big E-Shop Update: Order Status Tracking and More

🛒 Big E-Shop Update: Order Status Tracking and More

Wessels Company’s e-shop ordering platform has gone live with its biggest update yet! Thanks to input from over 460 unique users from around the world, we’re excited to announce these new, highly requested features.

Order Status and Custom PO Numbers

Now you can view your Wessels order number, your custom-entered purchase order number, order status, notes, and shipping information all on one screen by clicking the orders link on your account dashboard. To find the date of your order and order summary, click the blue order number link on the far left.

Admin accounts will be able to see all orders placed by users from their organization, while individual users will only see a history of their own orders. Please allow 1-2 business days for order information to populate after you’ve received your order acknowledgement.

Auto-load Default Shipping Notes

You can also now save custom shipping notes to your account by clicking the Addresses link on your acount dashboard. Add and save your information here and it will auto-load into all of your future orders. You can still change this during check-out, but if you find your shipping information rarely changes, you can save time by adding it here and having the system auto-fill the information for you.

Order Confirmation Page

Finally, we’ve added an order confirmation page to give you one last chance to double-check your order information before submitting it to Wessels. Make sure everything looks correct, click confirm, and then you should receive an order processing email immediately. One of our customer service representatives will then follow-up with an order aknowledgement to finalize the order and release it for production.

Future Roadmap

Wessels is dedicated to continuing to improve our online ordering and tracking platform We’re currently working on optimzing both of our websites for mobile use and we’ve made a slew of small improvements, such as catalog style matching and updated menu systems, to improve functionality accross the board. We’re always looking for feedback and suggestions for future features. Have questions or some ideas on how we could improve? Please message us at [email protected] and let us know!

How To: Size an Expansion Tank

How To: Size an Expansion Tank

There are six critical inputs needed to size any expansion tank:

    1. Amount of fluid to be heated
    2. The type of fluid being heated
    3. The starting temperature of the fluid
    4. The ending temperature of the fluid
    5. The minimum or starting pressure of the fluid
    6. The maximum or ending pressure of the fluid

First, let’s define each one of these components. Amount of fluid is the gallons of system volume. This can be obtained either from the system drawings or estimated based on the size of the trunk main of the system and the dimensions of the building. Often, an accurate way to acquire this number is to ask a chemical treatment professional. They can dilute a trace chemical in the system and then measure that dilution, which can be used to extrapolate the system size.

The type of fluid being heated is normally water or a mix of glycol and water. The specific volume of glycol increases with temperature faster than that of water. The difference between the specific volume at the starting and ending temperatures dictates the percentage increase in volume of the fluid. It should be noted that the piping system will also increase in size as it is heated. ASHRAE sizing, and most manufacturers, use a net expansion factor that accounts for the change in specific volumes less the expansion of the piping.

The starting and ending temperatures of the fluid depend on the type of system. For a heating system, the starting temperature is normally ambient, or 70 degrees Fahrenheit. The final temperature is typically your operating temperature, equal to the boiler set point. For a chilled water system, the starting temperature is normally the operating temperature or 30 to 40 degrees Fahrenheit. The final temperature of the chilled water system occurs if the system is allowed to go from operating temperature to ambient. The temperature used for tank sizing is typically 100 degrees Fahrenheit, which is the temperature of a very hot day for most areas.

The minimum starting pressure for the tank depends on the height of the building above the expansion tank location. Starting with a penthouse installation, the pressure of the piping in the top floor installation needs to be 10 psi to ensure proper purging of the air that can collect at high points in the system. This means that the expansion tank located in a penthouse would be set for that same pressure, or 10 psi. As the tank moves downward in the system, an increase of 1 psi is needed for every 2.3 feet from the top. If the tank moves down 80 feet from the top, an additional 80 feet/2.3 feet per psi, or 35 psi more is added. The resulting charge for the tank is 35 psi plus 10 psi (needed at the top) or 45 psi.

The maximum ending pressure is normally set by the “weakest link” of the system. For example, if a boiler, heat exchanger, and air handler have maximum pressures of 100, 150, and 75 psi, respectively, you may be tempted to think the air handler is that “weakest link”. If, however, the air handler is at the top of the piping system, the pressure of a 65 psi increase from 10 psi to 75 psi is allowable. The boiler, if located at ground level where the pressure is 45 PSI to start, can only experience a 55 psi increase before it reaches its maximum rated pressure. A good practice is to allow the maximum pressure to increase by 25 to 35 psi over the initial starting pressure. Consider an operator watching the cycle of the HVAC system; if they observe an increase from 45 psi to 100 psi, they may consider that an abnormally high-pressure swing. Observing a pressure from 45 to 70 PSI is deemed in the eye of most operators as normal, as it does not approach the equipment’s maximum pressure.

The governing equation for sizing any expansion tank is:

Tv=(EF(Vs))/(Pin/P1 -Pin/P2)


    Tv = Tank volume
    EF = expansion factor of fluid
    Vs = System Volume
    Pin = initial or pre-charge pressure (psia)
    P1 = starting pressure for system (psia=psig+14.7)
    P2 = final pressure for system (psia=psig+14.7)

EF is the expansion factor that equals the percentage difference of the starting and ending specific volume of the fluid, minus the volumetric expansion of the system piping. Expansion factor tables are available from most manufacturers to make this calculation more convenient.

Once you know the tank volume (Tv) you need, you can cross-reference that number with the acceptance volume of expansion tanks in our PDF catalog or our online ordering catalog

You can also download the Wessels Company phone apps or use you web-browser to access free-to-use sizing software by clicking “Size Your Tank Now