June 19, 2023
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Many factors go into determining to best possible materials for each component of a coil, depending, of course, on the application. Most commercial heating and cooling coils are constructed with copper tubes and headers, with aluminum fins, in a steel casing.
However, many other options are available, and the pros and cons of each material must be considered carefully for each individual coil, depending on its specific use and environment. The Marlo engineering team has extensive experience in designing coils using a wide range of metals, and can help assure that each component is optimized for your particular application.
Manufacturers that sell “off the shelf” coils can’t possibly stock coils in all the different possible material combinations. But as a custom coil manufacturer, we are able to construct each component from any of a wide range of materials, in addition to the common copper, aluminum and steel. We have experience using a number of “non-standard” metals, including steel, stainless steel, copper/nickel, black iron and others.
Under normal circumstances for use in commercial buildings, the combination of copper tubes and aluminum fins provide the best heat transfer efficiency for the cost. While copper is more than 1.5 times more effective at heat transfer than aluminum, it is also usually about twice the cost. So even though copper fins increase heat transfer, they typically do not justify the increased cost.
Stainless steel is another material we often work with, which offers maximum corrosion resistance and can withstand high temperatures and pressures. These features make it an ideal material for coils going into specialized industrial process applications, particularly in high temperature and/or corrosive environments. However, as with every material, there are always tradeoffs. Stainless steel is not only more expensive, but also provides lower thermal conductivity. Reduced thermal conductivity means that for a given coil size, a stainless steel coil will not provide the same temperature change to the incoming air as a coil made from copper tubes and aluminum fins.
For demanding industrial process heating and cooling applications that don’t require stainless steel – but do have higher than normal temperatures and pressures – we also offer copper, aluminum and steel in special grades and thicknesses to stand up to rugged demands.
The most common materials used for the main coil components are listed below.
The material used for a coil’s tubes depends on the type of coil and what will be flowing through it. Standard water and steam coils typically use copper tubes, but aluminum or stainless steel tubing can be used when needed. In the case of refrigerant coils, the type of refrigerant used will often dictate the tube material, particularly refrigerants that operate under extreme pressure, such as ammonia, which requires stainless steel tubes for their strength and durability. In addition, certain types of chemicals require aluminum tubes and high temperatures often require stainless steel.
Most commonly made of aluminum, fins can also be made from copper for added heat transfer capabilities and anti-microbial properties. In addition, stainless steel fins are ideal for corrosive environments or when extra durability is required. For example, many of the coils we manufacture for U.S. Navy vessels include copper fins. We also offer different fin patterns to meet individual needs.
The headers on coils are normally made of the same material as the tubes, with copper being the most common. For high-pressure steam coils – and other coils that operate under extreme pressures – welded stainless steel box headers are used to provide added strength. Other metals sometimes used for headers include steel and copper/nickel. In addition, most of our coils feature black iron threaded fittings, which are brazed onto the header connection stubs. We also routinely provide connections in red brass for applications where it is required.
Our casings are typically made of heavy-gauge galvanized steel or stainless steel. Casings/housings can be fully welded to be airtight when cross contamination of airstreams must be prevented.
While the options and combinations of coil materials may seem overwhelming, rest assured that the Marlo engineering team will choose the ideal material for each and every component of your custom coil, based on the requirements of your individual application. To discuss your needs, just contact your local Marlo representative.
Contact your local Marlo Independent Manufacturer’s Representative to discuss your coil needs and to get a fast quote using our Marlo Metrics coil selection software.
Find a Marlo Heat Transfer Solutions rep near youAll Marlo Heat Transfer Solutions’ commercial coils are engineered to meet our customer’s specific parameters. We prefer to design our equipment around your project.
Learn more about our coilsSo you’ve purchased your first portable rollformer and are ready to use it for metal roofing projects. How do you order metal coil for your portable roof panel machine? What information do you need to know about your machine, working with coil suppliers, and your project to order the right amount and type of metal coil?
At New Tech Machinery (NTM), we work and partner with various reputable coil suppliers, like Sheffield Metals International. We know how important it is to order the right coil so that it works properly with your NTM machine and find reputable and quality coil suppliers to do business with.
In this article, we’ll help you understand:
Before you begin the process of ordering metal coil for your portable rollformer, it’s critical that you understand some of the specifications of your machine that will help you figure out how much coil your machine can hold, the types and gauges of material you can use to make a quality finished roof panel, and how material gets used up when forming a profile so you can order the right coil width.
If you want to learn more, please visit our website cold rolled galvanized steel coil suppliers.
First, let’s talk about the material recommendations and how material gets used during the rollforming process to make a specific profile. This information will vary depending on your machine and whether you use an overhead reel rack or a free-standing decoiler.
What materials and gauges can you use with your NTM portable rollforming machine? While specific gauges and thicknesses vary across portable roof panel machines and manufacturers, New Tech Machinery roof panel machines have been tested for the following materials with limited adjustments (thicknesses vary by machine):
For each portable roof panel machine, there are certain maximum coil widths you’re able to use. From these measurements, your machine will have a specified finished panel width depending on your profile.
Material gets used up when the male and female legs of the panel profile are formed. Most panels will use between 4” to 6” of material to make a specific profile, so knowing how wide your limitations are is helpful when ordering coil and if you’re adhering to an engineered system. Look at the material usage and maximum coverage width for the profiles you want to produce to understand how much coil you’ll need.
The specified coil widths and finished panel widths (depending on the panel profile) of New Tech Machinery’s portable roof panel machines are:
Using coil widths or materials outside of what’s specified for each machine increases your risk of damaging the forming rollers or drive rollers, oil canning on the finished panels, or crashing the panel into the exit end of the machine from lack of clearance. It can also void your warranty if the machine is damaged due to the use of non-specified material types and widths.
Check your NTM machine manual for the specific material types and thickness recommended for your machine.
When ordering the right amount and sizes of metal coil for your portable roof panel machine, understanding your machine’s dimensions plays a big role. Knowing the weight and capacity of your machine’s accessories can help ensure you’re ordering the right coil initially.
Depending on your machine’s weight and dimensions with a trailer, it may not hold all sizes of coil. Understanding the machine’s weight on a trailer, overhead reel rack capacity, and maximum coil diameters of each machine is critical when ordering coil from a supplier.
The trailer manufactured and offered by New Tech Machinery has a 12,000 lb. capacity, and each machine’s weights on a trailer are as follows (including overhead reel rack and two expandable reels):
The dual overhead reel racks (weighing 336 lbs. except on the SSR, which weighs 316 lbs.) on all roof panel machines can support up to two 3,000 lb. coils, for a combined weight of 6,000 lbs when loading both expandable arbors with a coil. The SSQ II machine with optional notching can only support up to two 2,700 lb. coils because of the added weight of the notching units.
The maximum coil diameter, or outside coil diameter, measures how thick the rolled coil is. If the coil you use doesn’t fit these dimensions, it will be too big to fit the overhead reel rack or free standing decoiler. The maximum coil diameter is 32” with the overhead reel rack and 45” with the free standing decoiler.
When researching and talking to various metal coil suppliers about their products, finding the best ones to do business with, and knowing the ordering process, there are a few things to keep in mind.
Before talking to a metal coil supplier, understand the following about your project and portable rollforming equipment:
Project Considerations
Equipment Considerations
When determining the amount of coil you’d need for the job, you’ll need to know the profile you’re producing, how much material gets used up when forming that profile, the actual panel width the machine will make based on the profile, coil width needed for your project, roof coverage in square feet, and waste factor percentage (based on your crew’s experience level and the job’s complexity).
Talk to your coil supplier to determine exactly how much material you need to order based on your machine and project specifications. You can refer to manufacturer or coil supplier’s profile cut sheets for help understanding coil widths, panel widths, and material usage or see if they have a coil estimation calculator.
When you find a reputable coil supplier to order material from, what should you consider when ordering a coil for your portable rollforming machine?
While the process of ordering coil from different suppliers will vary, understanding your portable rollformer’s capabilities and the information you should have when talking to coil suppliers about ordering material is vital.
When talking to suppliers and figuring out how much material to order, remember:
Here at New Tech Machinery, we strive to help ensure our clients know exactly what kinds of metal materials and thicknesses their portable rollforming machines can handle properly. We also partner with and recommend some of the best coil suppliers to help you get the best coil for your NTM machine.
For references to some trusted partners and coil suppliers, or for more help understanding your machine’s coil requirements, feel free to reach out to one of our Account Managers!
For more information, please visit what is cold rolled steel used for.