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It depends on which Directive the vessel has to be compliant with. For instance, to comply with CE/PED, the test pressure shoud be 1.43 times the maximum operating pressure.

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Q: What is the criterion for deciding the hydro test pressure in relation to the design pressure of a pressure vessel?
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What is difference between design pressure and working pressure?

The working pressure is also referred to as the Maximum Operating Pressure (MOP). The MOP is the highest pressure expected during operation. The Maximum Design Pressure (MDP) includes the maximum pressure that is protected by relief valves in case of failure. For example, if the MOP is 100 psi and their are relief valves set at 10% above the MOP the MDP would be 110 psi.


Difference between set pressure and blow-off pressure?

The set pressure is the pressure at which a relief valve starts to open. When the valve is open and relieving, the pressure will be higher or lower than the set pressure, depending on the system and the valve design. That is the blow-off pressure.


What is the max pressure and capacity in fire tube boiler?

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Designing an axial fan for aircraft?

what do you mean? axial compressor (or) axial turbine? Their missions are different. Design for axial compressor or turbine, must be consider their performance. The performance is characterized by - pressure ratio, rotational speed and efficiency. The details of how to design axial fan, are very complex.


Why the tube of bourdon pressure gauge is elliptical?

the tube is elliptical because this is all part of the design which makes it elastic and tensile . as the tube is pressurised from within, this tends to make it uncoil and move in an outward direction , which causes a small movement within its quadrant gear and results in a pointer moving across a scale . as the pressure within is reduced the tube tends to return to its previous shape and coil back towards the centre of the gauge .

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