Many older carbon steel vessels do not meet modern code rules for low temperature service. The service history on these vessels is good resulting in an attitude that the current code rules are too restrictive. An alternative explanation is provided.
A generic registration covers a range of possible vessel configurations in one CRN. Without changing the operating conditions, diameter, wall thickness and material, a huge variety of changes can be made to a vessel. These changes are covered in one drawing and calculation set.
The CRN number can become quite long after all of the provinces have signed off on it. Methods of shortening the number are discussed.
Fittings must be registered in individual categories. This can increase registration costs and paperwork for companies with products that span more than one category.
Vessel registration numbers most commonly follow the format suggested by CSA B51-14 4.3.2.
Category H fittings often look like miniature vessels. Determining if you have a vessel or fitting only applies to items that look like large or small pressure vessels.
Fittings are broken down into categories for registration. A manufacturer must apply separately with different statutory declarations for each category that their registered product line covers.
