How to determine whether a container is under positive pressure or negative pressure
Thread Content
If the internal pressure is greater than atmospheric pressure, then the container is under negative pressure; if it is less than the external pressure, then the container is under positive pressure? Can it also be determined from the process flow diagram whether the container is under positive pressure or negative pressure?
On the contrary. (For example, in steam pipes, if there is negative pressure, steam will not be ejected.) ）
Internal pressure higher than atmospheric pressure is positive pressure; otherwise, it is negative pressure
Before looking at the process flow, one must first understand the process itself (the principle).
It seems the landlord needs to review the basic concepts
I’ve just started working in this field and am still quite confused. Could you recommend any reference materials?
In simple terms: if the system does not have a vacuum pump, and if the container cannot be evacuated, it should be a positive-pressure container.
When the storage tank is emptied, if the breather valve fails, an excessive discharge rate can also lead to a vacuum. Therefore, there should be two prerequisites for defining positive and negative pressure vessels: the housing and the operating environment.
When the internal pressure is greater than atmospheric pressure, it is positive pressure; when it is less than the external pressure, the container is under negative pressure. To determine the stress conditions of the container, installing a vacuum pressure gauge solves the problem....
Whether the pressure inside a container is positive or negative is determined by comparison with the external pressure; if the internal pressure is significantly positive, it is a positive-pressure container, whereas otherwise it is a vacuum container
It is correct that when the internal pressure is greater than atmospheric pressure, the container is under negative pressure; and when it is less than the external pressure, the container is under positive pressure.