Design of gas phase equilibrium pipeline at the top of liquid hydrocarbon spheres

The pressure in the propylene sphere tank is high. I’ll answer the second question. The combustible gases inside the spherical tank must be removed before maintenance. I. To remove all the liquid phase from within the spherical tank, there are two approaches: one is to use a compressor to increase the pressure of the gas phase at the top, thereby forcing the liquid phase at the bottom to flow out; the other is to use a pump to extract the liquid phase from the bottom. II. Completely evacuate the gas phase inside the spherical tank; there are two methods for this: one is to continuously displace and vent the gas with nitrogen, and the other is to inject water at the bottom of the tank so that the gas can be vented from the top until the tank is filled with water. III. The spherical tank to be overhauled is isolated from other systems using blind flanges; blind flanges are installed on all the feed and discharge lines, the gas phase line, the water separation tank, and the safety valves. IV. Access the manhole at the top of the spherical tank, open the valve at the bottom of the tank to drain water, and once the water has been completely drained, open the valve at the bottom of the tank. V. Ensure adequate ventilation; there are two options: one is to use natural ventilation by opening the manholes at the bottom and top to take advantage of the chimney effect, and the other is to install explosion-proof ventilators to enhance ventilation. VI. During maintenance work, it is essential to strictly follow the operating procedures for hot work and work in confined spaces, as well as to obtain the necessary permits for such activities. Appendix: The requirements can generally be met through the above treatments; if the levels of flammable gases and toxic/hazardous gases are still above the allowed limits, then steam or hot water treatment should be considered.

The pressure in the propylene sphere tank is high. I’ll answer the second question. The combustible gases inside the spherical tank must be removed before maintenance. I. To remove all the liquid phase from within the spherical tank, there are two approaches: one is to use a compressor to increase the pressure of the gas phase at the top, thereby forcing the liquid phase at the bottom to flow out; the other is to use a pump to extract the liquid phase from the bottom. II. Completely evacuate the gas phase inside the spherical tank; there are two methods for this: one is to continuously displace and vent the gas with nitrogen, and the other is to inject water at the bottom of the tank so that the gas can be vented from the top until the tank is filled with water. III. The spherical tank to be overhauled is isolated from other systems using blind flanges; blind flanges are installed on all the feed and discharge lines, the gas phase line, the water separation tank, and the safety valves. IV. Access the manhole at the top of the spherical tank, open the valve at the bottom of the tank to drain water, and once the water has been completely drained, open the valve at the bottom of the tank. V. Ensure adequate ventilation; there are two options: one is to use natural ventilation by opening the manholes at the bottom and top to take advantage of the chimney effect, and the other is to install explosion-proof ventilators to enhance ventilation. VI. During maintenance work, it is essential to strictly follow the operating procedures for hot work and work in confined spaces, as well as to obtain the necessary permits for such activities. Appendix: The requirements can generally be met through the above treatments; if the levels of flammable gases and toxic/hazardous gases are still above the allowed limits, then steam or hot water treatment should be considered.

Thank you for your reply. The propylene spheres and ethylene spheres have been overhauled. However, considering the characteristics of C4 materials, which have a strong odor, I’m not sure whether steam or hot water treatment is necessary.

It’s generally not necessary, but with a people-oriented approach, you can cook if you wish; just make sure to clean the sediment at the bottom of the pot regularly

Gas-phase equilibrium tubes are generally required to be bag-free, but it is difficult to achieve this in terms of piping. If it is bag-shaped, appropriate consideration should be given to the handling method after fluid accumulation.

That’s indeed the case; the design requires no bag formation, and it’s almost impossible to achieve this in actual piping installations. The best approach is to reduce the size of any bag-like formations that may appear