Pressure vessel issues
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The diesel stripping tower from 2004 had a design pressure of 0.26 MPa, with a maximum allowable operating pressure of 0.08 MPa; it was designed as a pressure vessel at normal conditions. However, in practice the normal operating pressure reached 0.12 MPa, which meets the requirements for pressure vessels. When consulted, our company’s equipment management staff replied that the design should be followed. Here’s the question: what should we do now to make changes? Is it a pressure vessel or a regular vessel?
The working pressure has exceeded the maximum allowable level. The first thing to check is not whether there is a problem with the pressure vessel, but rather that this vessel is being used in violation of regulations; it must be replaced. Otherwise, any problems that arise will constitute serious liability incidents.
1. The design pressure at that time was 0.26 MPa; how can it be classified as a pressure vessel at normal pressure? 2. Why could the maximum allowable operating pressure be lower than the design pressure? 3. The normal operating pressure has reached 0.12 MPa, and it should now be subject to regulatory control.
Is it the design pressure that determines a pressure vessel? Pressure vessels are determined by their operating pressure. The poster needs to clarify two points here: 1. The design is fine; the maximum allowable operating pressure is 0.08 MPa, which is below 0.1 MPa, so it is a vessel at atmospheric pressure. 2. There are issues with operation; why is it running at 0.12 MPa now? ? Above 0.1 MPa, it becomes a pressure vessel.
This post was last edited by zjq1962 on 2018-5-14 08:32. The pressure vessels you are referring to are those governed by relevant regulations; I am talking about vessels that comply with GB/T150 standards. If the design pressure exceeds 0.1, it cannot be considered a non-pressure vessel. The work pressure you mentioned cannot be called the maximum allowable work pressure; it should be referred to as work pressure (the specifications in version 99 use the term maximum working pressure). In this case, it is the operating conditions provided by the user that are incorrect
If the design pressure is higher than 0.1 MPa, it should not be classified as a pressure vessel at normal pressure, but rather as a pressure vessel governed by GB/T150. The “maximum allowable operating pressure” mentioned by the poster should refer to the “operating pressure” specified in the current standards!
This post was last edited by zsfb85227 on 2018-5-14 09:24. It is a pressure vessel at normal pressure, and this represents a violation of process regulations. The issue now is not one of modifying the equipment – a pressure vessel cannot be turned into a vessel that operates under pressure. Either the process needs to be adjusted or the equipment needs to be redesigned
As the user entity, the owner should manage it in accordance with the capacity regulations, rather than from the perspective of equipment design. The actual operating pressure is 0.12 MPa, which already exceeds the maximum operating pressure specified in the process requirements of 0.08 MPa; moreover, since the operating pressure is above 0.1 MPa, it falls under the category of pressure vessels. 1. Illegal operations. 2. The container needs to be re-evaluated as a pressure vessel. If the design is based on normal-pressure vessels, the design firm needs to recalculate the equipment.
The company’s equipment management staff replied that they respect the design – what does that mean? If what he means is that the working pressure can be below 0.08 Pa, then reducing the working pressure eliminates the need for additional design work ； If the working pressure truly needs to be increased, the design unit shall make the modifications and submit the application for re-inspection.
Its usage nature has changed; it wasn’t subject to regulatory controls before, but now it’s being used at pressures above the allowed limits
It was originally a pressure vessel at normal pressure. Currently, pressure vessels are often used under pressure in violation of regulations; however, with a design pressure of 0.26 MPa and an operating pressure of 0.12 MPa, problems generally do not occur. If registration is to be carried out using inspection equipment, the relevant documents are missing. It also can’t be registered. Use it secretly; it’s sufficient to claim that the operating pressure is below 0.1 MPa.