What ASME Code Means to Pressure Vessel Customers

vertical pressure vesselPressure vessels, whether they are used as chemical holding tanks, chemical storage tanks, or reactors, must be manufactured to meet certain safety standards under the laws of every Canadian province and 49 of the 50 US states. Standards for boilers and pressure vessels were created in response to thousands of boiler accidents in the United States and Europe during the late 1800s and early 1900s, particularly an accident in 1905 that leveled a factory and resulted in 58 fatalities.

The standards for designing and manufacturing boilers and pressure vessels are set by the American Society of Mechanical Engineers or ASME. This code is referred to as the Boiler and Pressure Vessel Code or BPVC. The BPVC has 12 sections, identified by Roman numerals I through XII. The BPVC applies whether the pressure vessel is a vertical pressure vessel or horizontal pressure vessel.

ASME Pressure Vessel Standards

The section covering the construction of pressure vessels is ASME Code, section VIII. When a pressure vessel is constructed in compliance with section VIII, the manufacturer may stamp the pressure vessel with a certification mark. Section VIII contains three divisions.

Section VIII, division 1 defines standards for pressure vessels having an internal or external pressure greater than 100 kPa (or 15 psi). Pressure vessels manufactured according to the standards of division 1 are stamped with U, UM, or UV certification marks.

Section VIII, division 2 defines standards for pressure vessels having an internal or external pressure between 20700 kPa (or 3000 psi) and 70000 kPa (or 10000 psi). These standards also cover human occupied pressure vessels used primarily in the diving industry. Pressure vessels manufactured according to the standards of division 2 are stamped with U2 and UV certification marks.

Section VIII, division 3 defines standards for pressure vessels having an internal or external pressure greater than 70,000 kPa (or 10000 psi). Pressure vessels manufactured according to the standards of division 3 are stamped with U3 and UV3 certification marks.

What it Means to Be an ASME Pressure Vessel Manufacturer

Authorization for a manufacturer to use the ASME certification marks requires the manufacturer to have an inspection agreement with an authorized inspection agency and a quality control system to ensure compliance with all design, material, fabrication, examination, and inspection standards. For example, the geometry of the parts of a vertical pressure vessel would be defined by the ASME standards. A vertical pressure vessel manufactured by an ASME pressure vessel manufacturer must be made from an approved material (both in terms of material type and material thickness). The BPVC includes standards for carbon and low alloy steel, non-ferrous materials, high alloy steel, and cast iron. The standards vary depending on the material. For example, the standards for carbon steel, with its tensile strength of 580 MPa and a yield strength of 260 MPa, are different from the standards for cast iron, with its tensile strength of 200 MPa and a yield strength of 130 MPa. The BPVC also sets standards for fabrication, depending on whether the vertical pressure vessel is welded, brazed, or forged. The ASME standards define how the vertical pressure vessel should be examined by the manufacturer and how the vertical pressure vessel should be inspected by an authorized inspection agency.

What it Means to Be a Customer of an ASME Pressure Vessel Manufacturer

A vertical pressure vessel or horizontal pressure vessel manufactured by an ASME pressure vessel manufacturer has met industry and legal safety standards. It is sized and shaped to meet design standards, manufactured from approved materials, fabricated using approved techniques, examined by the manufacturer, and inspected by an approved inspection agency.

Common Warning Signs Of Pressure Vessel Fatigue You Need To Know

Pressure vessels need careful inspections during manufacturing and operations because they’re designed to operate in diverse environments and conditions. A major part of these inspections is detecting any fatigue or failure points that could have an impact on the pressure vessels and how it works.

It’s important to understand how fatigue can occur whether your pressure vessel is brand new or it’s been working for your business for years. When you know the warning signs of fatigue and failure, you can prevent possible problems from turning into disastrous disruptions.

How do I know when my pressure vessel is fatigued?

Your pressure vessel will undergo a variety of inspections including a physical top to bottom inspection. This physical inspection ought to put an emphasis on the parts of your pressure vessel that are especially vulnerable to fatigue. These parts include inlet and outlet ports, valves, valve stems, maintenance hatches, and sensor ports.

If you notice any of the following signs in these areas, your pressure vessel may be suffering from fatigue.

    • Rust or oxidation
    • Material pitting
    • Frozen or sticky latches
    • Loose nuts or bolts
    • Material discoloration
    • Cracks that can be spotted with a magnifying glass
    • Bowing piping
    • Piping that’s out of alignment
    • Chemical corrosion
    • Material weakening
    • Valves that require effort to turn

When you notice any of the above signs of pressure vessel fatigue, it’s crucial to take corrective measures immediately. A pressure vessel that shows signs of fatigue ought to be placed in a no-load condition until a certified inspection can be conducted.

Fatigued pressure vessels are considered a potential hazard and you need to treat them as such. Only inspections that correspond to ASME Section VIII rules and regulations ought to be conducted, and only an ASME-certified inspector should be doing the inspection.

Check your manufacturing records

You need regular certified inspections on your pressure vessel, but cursory inspections can also help you to identify the parts that need your attention. It’s important at this stage to consult the manufacturing records and documents that came with your pressure vessels to help you figure out which areas may be facing fatigue.

The pressure vessel manufacturer may have noted areas of concern in the records. If they did, check these areas for any signs of fatigue. A pressure vessel fatigue analysis is performed during manufacturing to determine the fatigue life of different parts of your vessel.

When you know the results of the analysis and the length of the pressure vessel’s operation, you can point out the specific areas that may need a primary inspection.

Where can I find a pressure vessel manufacturer near me?

Because of the need for energy, the global pressure vessel market is expected to grow by 6% CAGR until it reaches a significant value by 2023. To keep up with the demand, you need efficient stainless steel pressure vessels.

Central Fabricators is an ASME pressure vessel manufacturer that offers a variety of vertical pressure vessels and horizontal pressure vessels to meet your needs. To learn more about our pressure vessels and storage tanks, contact Central Fabricators today.

Four Ways To Heat and Cool a Pressure Vessel

It is a fact, that for over 150 years water has been stored and transported using steel. Naturally, there has been much progress and many changes made in the methods that steel is used. Let’s look at four ways that steel is used to heat and cool a pressure vessel.

1. Dimple Jacket Heat Transfer

The dimple jacket form of insulation is a tank cooling jacket that takes stainless steel and welds it directly to the pressure vessel. The jacket has punched areas of dimpled stainless steel (called dimples) which assist with the heat or cooling transfer of the fluid. The dimple jacket heat transfer process or cooling process, can be used to heat or cool the contents of the pressure vessel or the storage tank.

2. Clamp-On Jackets

This type of heating and cooling jacket is bolted directly onto the vessel with clips. It is easy to use and very easy to replace. However, one drawback is that it is initially quite expensive to make. This is because it has to allow for nozzles to pass through the jacket and those cut-outs have to be built into the jacket design.

3. Conventional Jackets

These conventional jackets are custom made designs for heating and cooling a pressure vessel. One advantage is that they can accommodate cut-outs for nozzles. One disadvantage, however, is that jacket pressure causes a lot of external pressure on the inner vessel.

4. Bundle Type (or Bayonet) Insert Heaters

This is an ingenious design for heating and cooling a pressure vessel. A flanged opening allows for insertion of a tube or pipe bundle heater.

5. Internal Pipe Coils

This is a very efficient form of heat transfer. Usually, it uses 2” or 3” pipe coils. It is also one of the most cost-effective types of designs for heating and cooling a pressure vessel.

Pressure vessels are used to hold liquids or gasses at temperatures that are different from the ambient temperature. Stainless steel storage tanks, dimpled stainless steel jackets, a jacketed vessel, as well as a tank cooling jacket are all excellent methods of heating and cooling pressure vessels to help keep pressure vessels safe and effective.

Five Things to Look For in Limpet Coils

A limpet coil manufacturer is responsible for making limpet coils. A limpet coil, which is part of a limpet coil reactor, is created by welding half a pipe around the outside of a pressure vessel. The intention is to create a flow channel which is semicircular in shape. The temperature in the limpet coil helps control the temperature (heating or cooling) of the element inside the pressure reactor. Here are five things to look for in well-made pieces from a limpet coil manufacturer.

1. Corrosion Resistant

One critical factor for a limpet coil manufacturer is making sure that their product is corrosion resistant. If it does not resist corrosion, such as rust, for example, the entire pressure vessel could be destroyed, and the environment could be put in peril, too.

2. Temperature Resistance

Temperature resistance is a challenging part of the process for a limpet coil manufacturer. From baking, sizzling sun to arctic cold and winds, the units must still be able to perform the function for which they were made: that is, heating and cooling the pressure vessel.

3. Weatherproof

Earthquakes, mudslides, sand storms, winds, hurricanes…a limpet coil manufacturer must be sure that their product is able to survive the most extreme elements and most intense weather events.

4. Sturdy Construction

Sturdy construction is a key component of products made by a limpet coil manufacturer. The materials must be able to withstand time, the elements, and being jarred, jostled, or bumped by other pieces of machinery. It is imperative that the limpet coil reactor, jacketed vessel, and stainless steel storage tanks stay intact.

5. Durable Standards

Durability is a standard of excellence, and a good limpet coil manufacturer will have high standards for durability. Since a pressure vessel is an expensive investment, the limpet coil/reactor must be made to last for a long time.

It is a well-known fact that the steel industry in the United States employs over 142,000 people and is among the very top steel-producing industries in the world. The limpet coil manufacturer has a distinct and important function. Whether the chemical storage tanks are designed as a horizontal pressure vessel or a vertical pressure vessel, the limpet coil reactor is a key piece of the puzzle. Careful manufacturing, monitoring, and installation will make sure that all is done safely and securely, because then it will last for years to come.

How Do I Know When It’s Time For A New Stainless Steel Storage Tank?

Spring is almost here, which means many different industries are digging their heels in and making necessary repairs and maintenance to get their equipment ready for another year. One piece of equipment you ought to be paying attention to yourself is your above ground storage tank, or AST.

Chemical tanks are highly durable and can last for a long period of time. But they don’t last forever. So how do you know whether your chemical tank needs a little elbow grease or whether it’s time to seek out a new replacement?

Here are some of the most common signs that its time for a new stainless steel storage tank.

Your tank has been around for more than 15 years

Stainless steel chemical tanks are incredible when it comes to durability. Unlike concrete tanks, stainless steel tanks can’t easily crack and they’re leak-free.

But although stainless steel chemical tanks can maintain their properties and shape over a long period of time, it’s important to replace them if it’s been between 15 to 20 years. After this time, your tank can start to lose its luster and damage may be more common.

The tank isn’t staying clean

Stainless steel chemical tanks are very easy to clean and they’re considered more hygienic than other types of tanks. This is crucial when the tank is housing products like food or water.

If your chemical tank doesn’t seem to be staying clean, it could be a sign that corrosion has started to take place inside the tank. When corrosion begins, it’s important to replace your stainless steel chemical tank to keep it from affecting the materials inside.

Additionally, it’s important that you clean your stainless steel chemical tank regularly to keep corrosion at bay. Deposits, water, and mechanical abrasion can impact the integrity of the tank and damage the tank’s protective layers.

Looking for high-quality stainless steel storage tanks?

The four most common types of metal used in the U.S. construction industry include carbon steel, stainless steel, aluminum, and copper. Stainless steel, in particular, is known for its strength and resistance to rust.

Central Fabricators offers stainless steel chemical tanks, coil pipes, and jacketed reactors so you can find everything you need in one place. To learn more about our stainless steel storage tank and coil pipes, contact Central Fabricators today.

What Is Stainless Steel And Why Is It So Common?

Almost everyone has something in their home that is made of stainless steel and we have all heard the commercials that advertise stainless steel as a major selling point for their products. At this point, most consumers don’t think twice about what stainless steel actually does and just know that anything made of it will be a high-quality product.

But what exactly is stainless steel? Read on to learn what makes stainless steel different from other metals and why so many products, from top-of-the-line dishwashers to stainless steel storage tanks, are made from it.

What Is Stainless Steel?

Stainless steel is actually a generic term for several different steels that are all composed of at least 10.5% chromium by mass. Stainless steel is also typically made of nickel, iron ore, silicon, carbon, manganese, and nitrogen. Nitrogen is a particularly important element, as it is what gives stainless steel its ductility and corrosion resistance.

To make stainless steel, manufacturers melt down this list of raw ingredients with high heat until they combine into a single material. They then cast the molten steel into preliminary molds to aid the steel in the process of getting to its final form. Manufacturers can then remove these raw steel shapes from their molds and fashion them into whatever form they need. For stainless steel storage tanks or stainless steel chemical tanks, manufacturers form them into large vessels that accommodate the needs of their clients.

Why Is Stainless Steel So Common?

Many modern appliances and industrial products are made of stainless steel because of its ability to withstand extreme temperatures, strength, and resistance to rust and corrosion. This last quality is especially important, as consumers and industrial businesses want products that will last a long time and require relatively little upkeep.

Nature is the main force behind corrosion. Most metals only exist in nature when they’re combined with other elements and they will try to return to that state if they can. In the form of precipitation or wind, nature is always trying to combine elements that humans have produced in their pure forms. Luckily, humans needed equipment like stainless steel pressure vessels and found the trick to producing the material that could resist natural forces.

Stainless steel is popular for good reason. It gives individuals and businesses the longevity they need in their appliances and products. Contact Central Fabricators today to learn more about the stainless steel storage tanks and chemical holding tanks that will stand the test of time.

5 Benefits of Using Stainless Steel Storage Tanks

If you’re deciding what kind of above ground storage tank (AST) to purchase, though you have to consider size and location, you need to first determine what material it’s constructed from. Polyethylene and concrete tanks are great, but the best option available remains stainless steel. Stainless steel storage tanks are durable, cost-efficient, and have so many additional benefits.

The U.S. is one of the top steel-producing industries across the globe and employs over 142,000 people. Steel has been an effective way to store and transport water for over 150 years.

Here are some of the main advantages of stainless steel storage tanks:

    • Durability — Concrete water tanks are easily cracked, resulting in leaks. Stainless steel tanks, on the other hand, are leak-free. Since a single tiny crack can ruin the integrity of a tank’s structure, when storing water you need to make sure that leaks simply cannot form.
    • Recyclability — Stainless steel is considered an environmentally friendly material since the production process utilizes natural resources and energy. New stainless steel items are comprised of roughly 60% to 70% of recycled material, which are biodegradable. And storage tanks made entirely of stainless steel are eco-friendly and 100% recyclable.
    • Hygiene — Not only are stainless steel water tanks easy to clean, but they are also much more hygienic than tanks constructed of other materials. If a tank is keeping water, food, or any other product inside, it’s imperative to ensure the hygiene and purity at all times.
    • Customization — Despite its durability, stainless steel can be bent, rolled, and shaped to fit all kinds of customized needs. Additionally, tanks can be designed in a wide variety of diameters, lengths, and heights, which offers flexibility for many industries with unique storage requirements.
    • Longevity — Stainless steel chemical tanks can maintain their shape and properties over an extended period of time, as well as over a wide range of temperatures, especially at extremely cold temperatures. Also, this material is less affected by UV light, which can significantly damage chemical storage tanks made of other materials.

If you want to learn more about the benefits of stainless steel storage tanks or purchase quality chemical holding tanks, give Central Fabricators a call today.

Exploring 3 Main Uses For Stainless Steel Storage Tanks

Stainless steel is a generic name for several different steels that all are a minimum of 10.5% chromium by mass. And while steel storage tanks can be used across countless different industry sectors, their main uses involve holding three categories of materials. Let’s take a look at the three main uses for stainless steel storage tanks across the country.


First, it should come as no surprise that stainless steel storage tanks are frequently used to carry and transport water. In fact, steel itself has been used to store and transport water for more than 150 years. This is virtually a universal application because it is used so widely out of necessity in industries including agriculture, manufacturing, irrigation, fire protection services, and more. All of these industries require having a huge amount of water available at just a moment’s notice, and stainless steel tanks are among the healthiest and most efficient way to do so due to lack of corrosion and extreme durability of the material.


Stainless steel chemical tanks, as their name implies, hold all different types of chemicals and chemical mixtures. Chemical holding tanks are most frequently used to resist corrosion and protect against spills that other materials may cause with just a simple puncture. Stainless steel can withstand a huge variety of environmental conditions, ensuring maximum protection against leakage and the hazardous safety conditions that result from such spills.


Finally, countless businesses within the agriculture industry frequently take advantage of stainless steel chemical tanks for purposes that involve improving feeding efficiency for cattle and livestock. Once again, since stainless steel won’t corrode, dissolve, chip away, or contaminate contents in any way, it’s by far the best way to store livestock feed, which is essential for prolonged health as well as safety for animals. In the long run, this helps to increase cash flow through minimized waste.

Carbon steel, stainless steel, aluminum, and copper are four of the most common types of metal used in the U.S. construction industry, but when it comes to holding the critical supplies listed above, only stainless steel can hold up to the challenge. For more information about stainless steel coil pipes, contact Central Fabricators.

Heating and Cooling Vessels: What You Need to Know

The U.S. is one of the top steel-producing industries in the world and employs over 142,000 people. That being said, coil pipes and stainless steel pressure vessels are being used in countless industries across the United States. Here’s what you should know about the heating and cooling of customized pressure vessels.

Jacketed Pressure Vessels

First, jacketed vessels typically require a secondary shell or head that’s fabricated two to three inches of space away from the primary vessel. The main advantage of jacketed pressure vessels is that they have the ability to accommodate heavier allowances of corrosion. You can also locate cutouts to accommodate the nozzles that typically pass through the jacket. However, the one downside to jacketed pressure vessels and coil pipes is that that may sometimes require an internal vessel wall that is heavier than other types.

ASME Notes

It’s also important to point out that any design pressures that exceed 15 PSIG are typically ASME pressure vessels. With this in mind, vessels that meet every ASME code requirement may have the ability to be labeled at a lower pressure at the customer’s request. For more information, contact your manufacturer.

Stainless Steel Benefits

Stainless steel is a generic name for several different types of steel that all are a minimum of 10.5% chromium by mass. That being said, the material is generally considered superior due to its lack of corrosion and extreme durability. Again, discuss your needs with your manufacturer to determine the best particular model.

The Importance of Precision

Precision is absolutely critical in any type of application that requires the ongoing use of coil pipes and pressure vessels. That being said, it’s your company’s responsibility to determine the best ways to proceed with safety and efficiency in mind. Don’t hesitate to take all the time you need to sit down with your equipment manufacturer to discuss your needs in detail in order to find the best equipment solutions.

Ultimately, understanding the facts about various heating and cooling vessels can help you make the most well informed decisions for your chemical storage needs. For more information about dimpled stainless steel chemical tanks, contact Central Fabricators.

3 Top Benefits of Stainless Steel Chemical Storage Tanks

Stainless steel is a generic name for several different types of steel alloys, all of which are a minimum of 10.5% chromium by mass. And even though steel has been used to store and transport water for over 150 years, it’s being embraced as a reliable and durable way to store chemicals as well. With that in mind, here are just a few of the top benefits of dimpled stainless steel chemical storage tanks.




First and foremost, stainless steel tanks are incredibly durable. They’re virtually indestructible, even when used to store corrosive chemicals. Stainless steel tanks also show resistance to becoming misshapen and can resist cavitation. In general, they’re much better at preventing or reducing wear and tear than other materials. This also makes for increased safety, since any corrosive materials stored improperly could have dangerous results.


Corrosion Protection


As mentioned, stainless steel chemical storage tanks are superior when it comes to corrosion resistance and protection. While concrete and plastic storage tanks often fall apart or allow for chemicals to corrode and cause damage, stainless steel metals resist oxidation and corrosion through durable and insulated layering. That’s right — in most cases, you don’t need additional industrial coatings to ensure corrosion resistance — stainless steel is inherently resistant to corrosion, and thus chemical leaks.


Cost Efficiency


Finally, stainless steel pressure vessels and chemical storage tanks are incredibly cost efficient. Yes, they may require a higher upfront investment compared to chemical storage tanks and pressure vessels made from other types of materials. That being said, their overall lifecycles make them much more efficient of an investment than materials that cost slightly less and don’t last as long. If you want the ultimate durability, corrosion protection, and cost efficiency, stainless steel is the best material to use. Of course, don’t hesitate to contact your manufacturer for further recommendations.


Carbon steel, stainless steel, aluminum, and copper are four of the most common types of metal used in the U.S. construction industry. But whatever type of dimpled stainless steel tanks you need, understanding these benefits can help you select the best material. For more information about stainless steel chemical tanks, contact Central Fabricators.