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Issues regarding the discharge setting at the safety valve outlet under the condition of cracked heat exchange tubes

2017-11-30View Original

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I would like to ask my colleagues: For shell-and-tube heat exchangers, the scenario of rupture of the heat exchange tubes is often taken into consideration. Previously, our company’s design approach was to increase the design pressure on the low-pressure side of the heat exchanger to more than 2/3 of that on the high-pressure side, in order to avoid the need for installing safety valves ; However, the evaluation experts later raised the issue that even by increasing the design pressure on both sides, it is not possible to prevent the heat exchange tubes from breaking (as tube rupture is related to vibration and corrosion). Later, safety valves were installed, and the pressure on the low-pressure side of the heat exchanger never increased again. But the problem is that discharge becomes an issue after the safety valve is installed; once the safety valve activates, how is this gas-liquid mixture (primarily liquid) typically handled? (The separator’s effectiveness is limited.) I’d like to discuss this with my colleagues – what are your approaches?
Reply #22017-12-01
This post was last edited by hcer on 2024-11-9 at 11:31.
Reply #32022-06-27
The function of the safety valve is not to prevent the rupture of the heat exchange tubes, but to address the safety issues arising from overpressure on the low-pressure side caused by such ruptures

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