Large, heavy, high pressure, and custom are all the types of ASME Pressure Vessels we love to manufacture.
Didion Vessel has a wealth of knowledge and experience as a designer and fabricator of custom ASME code pressure vessels. We currently hold the ASME U1, U2, and U3 stamps for pressure vessel fabrication. Because of this, we are able to build and certify units to any of the three divisions of ASME Section VIII. We also hold the NBIC R-Repair stamp, in case you are in need of a repair.
Our company also has the benefits of having a variety of in-house services at our shop in Bellevue, Ohio (USA). These include services such as post weld heat treatment, RT, PMI, sandblasting, and painting. Since we rely so little on third party vendors, we are in a great position to get your projects done on time. This also helps us to keep tight control over the quality of your ASME code pressure vessel, which is very important to us as a manufacturer
We provide all the below services in-house at our location in Bellevue, OH USA.
Because of the ASME code or the customer, many of the pressure vessels we fabricate require specialized testing. As mentioned before, we offer in-house nondestructive testing (NDT). This process has many names, such as nondestructive examination (NDE), nondestructive evaluation (NDE), and nondestructive inspection (NDI). Whatever you call it, the point of using it is clear: it helps to identify flaws with your vessel before you put it to use. This greatly lowers the chance of vessel failure in the future. This means your staff and property are much safer. You can also rest easy in knowing that we employ a certified weld inspector (CWI) on our staff at all times.
The National Board of B & PV Inspectors (NBBI) is the group that provides the National Board Inspection Code (NBIC). This code is widely recognized around the world. We hold the NBBI R-Repair stamp. Therefore, we are certified to repair or alter your tank and re-certify it with the National Board. We are not only an ASME code pressure vessel manufacturer, but also a repair shop.
The term is very broad. But, in its most basic form, a pressure vessel has the following traits in most cases. Firstly, it is a tank that holds liquids, vapors, or gasses at a pressure over 15 psig. And, secondly, it has an inside diameter over 6-inches. One thing is for sure, it seems almost every design is different! Much is determined by the purpose of the tank and where it is to be used. Rest assured though, there are rules that give guidance on almost every case that ensure the safe use of your tank. It is always best to consult with someone with experience in order to determine what rules apply to your case.
To explain, the Boiler and PV Code (BPVC) is provided by the American Society of Mechanical Engineers (ASME). The section of the ASME BPVC that governs most code pressure vessels is ASME Section VIII, and within this section there are also three divisions: ASME Section VIII, Division 1, 2, & 3. Div 1 units carry the ‘U1’ Stamp, Div 2 units carry the ‘U2’ Stamp, and Div 3 units carry the ‘U3’ Stamp.
Usually, the design rules of Div 2 are more conservative than Div 1. Because of this, you can usually use higher allowable stresses in Div 2, resulting in thinner heads and shells. Div 3 provides rules for tanks that exceed 10,000 psi. None of these three divisions establish a max pressure limit for itself, nor a minimum. Of course, there are exceptions in every case.
The bulk of all units, though, are built to Div 1. This is because, in most cases, the increased design costs in using the other divisions out weighs the cost savings of thinner heads and shells. And, simply put, there are less headaches for the ASME code pressure vessel manufacturer when using Div 1. At Didion Vessel, however, we have years of experience dealing with U1, U2, and U3 stamped units. So, we can help you figure out exactly what you need, and we can help you in the design process.