Pressure vessel modification
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The pressure vessel has been in operation for less than a year, and due to significant deviations between the incoming materials and the design specifications, it is necessary to modify the device. It is possible to create new openings in the pressure vessel or add turbulence-inducing measures inside it; either approach requires welding work on the equipment. Is it permissible to do this? What are the general procedures for re-welding? Seeking advice from professionals.
As a side note, it’s a regular pressure vessel without heat treatment
It is recommended to provide information on both the medium pressure and volume; otherwise, it will be impossible to answer this question as there are too many factors involved. The scope of containers is too broad; it’s difficult to define what exactly is meant by a conventional pressure vessel. Should it be considered a simple pressure vessel, or a low-pressure vessel that is neither flammable nor explosive?
It is a tower-type reactor with a design pressure of 1.5 MPa and a design temperature of 80 degrees. The media used are wastewater and compressed air, which are not flammable or explosive. Its diameter is 2.5 meters and its height is 20 meters
Modification is allowed. The simplest way is to find a company with the qualifications for renovation and have them take care of the entire process. This requires many procedures and inspections. You can refer to the standard specifications; there’s a direct download available on the forum.
1. A unit with the appropriate manufacturing qualifications shall prepare the construction organization plan (which must include strength calculations carried out by a unit with corresponding design qualifications, along with a report detailing those calculations), while the construction party shall fill out the notification form for the maintenance and modification of special equipment； II. The construction unit shall go to the special equipment section of the Quality and Technical Supervision Bureau in the area where the equipment is located to handle the relevant modification procedures (bringing with it a notice regarding the repair of special equipment, a construction plan, the construction unit’s qualifications, and the qualification documents of the construction workers, etc.) ； III. Take the approval documents from the special task department to the boiler inspection agency in the area where the equipment is located to complete the procedures for construction supervision and inspection ； IV. The construction unit carries out the construction work along with the corresponding inspections; the boiler inspection agency conducts its own inspections, and the construction unit issues a certification of successful renovation while the boiler inspection agency issues a supervision certificate.
It is a high-class container; 1. Modifications require altering the main pressure-bearing components, and supervision and inspection are necessary； 2. For the modification of pressure vessels, it is necessary to engage a design firm with the appropriate qualifications to prepare the designs ； 3. Transform qualified manufacturing units for the modification ； 4. Once the parameters are accurate, recalculate them and then proceed with the modification.
Owners must never hire anyone to make changes on their own; they should instead find a company that has the qualifications for manufacturing pressure vessels to carry out these tasks. It is necessary to inform the special inspection agency, and there are many inspection procedures and processes that need to be followed. The pressure vessel unit can be handled directly; it’s better to turn to the original manufacturer.
The answers you’re looking for are in TSG21-2016
Thank you all; it is indeed quite troublesome