Management of high-temperature pumps in petrochemical refineries
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What is the definition of a high-temperature pump in petrochemical refineries? Does it refer to pumps whose operating temperature is higher than the auto-ignition point of the transported medium, or pumps whose operating temperature is above 200°C? What are the requirements for daily management and the purchase of pumps? Should the inlet and outlet valves be designed as remotely controlled valves? It is possible to control them both locally and remotely; generally, are electric valves or pneumatic valves used for this purpose? I would appreciate guidance from those with more experience.
The original poster can take a look at this post: Sinopec’s \"Guidelines on Ensuring the Safe Operation of High-temperature Oil Pumps\": https://bbs.hcbbs.com/thread-1662932-1-1.html
Thank you for providing the resources; I’m very grateful. . .
We can communicate with each other regarding the medium transported by my factory: it’s a strong acid, with a temperature of 220 degrees Celsius and a maximum temperature of 310 degrees Celsius. Currently, PFA-lined materials are being used, and the results are quite good.
With such high temperatures, is it a pump with a steel-lined PFA material? Can you tolerate it? Could the teacher upstairs give an introduction? :)
When the medium temperature is above 200°C, it is considered a hot oil pump (200–400°C). The materials used are mainly carbon steel and alloy steel. There is no need to use remote control valves for the inlet and outlet valves; the pump still needs to be started manually on-site. There is a control valve after the outlet valve, which can be adjusted remotely by DCS operators to control the flow rate, and a check valve is also required at the outlet.
Generally, pumps with a medium temperature of over 200 degrees are considered high-temperature pumps; in the past, the oil slurry pumps used in catalytic processes were made of heat-resistant alloy steel. An outlet manual valve was installed, and later a pneumatic control valve was added.
Most importantly, the cooling water for the sealed backwash cooler must come from a closed-loop desalination station; if such a station is not available, temperature readings at the water inlet and outlet points of the cooler should be taken to determine whether there is blockage based on changes in temperature differences. It is also necessary to measure the temperature of the seal, as this is key to ensuring its longevity! ! ! !
Secondly, the high-temperature pump must be kept in a hot standby state; during standby, the pump heating circuit should remain active to keep the pump at a high temperature, thereby preventing too rapid temperature rise in case of an emergency and requiring an immediate switch-over
There are standards for selecting materials for high-temperature pumps, and these methods are quite mature. As long as the poster pays attention to those two points, there will be no issues with sealing; and if sealing is fine, then there will be no problems over a long period of time. One more thing: for aligning the pump, the heating pump circuit needs to be turned on in order to carry out alignment in a hot state
1. High-temperature pumps in refineries refer to pumps whose operating medium is flammable and explosive and whose temperature is above 250°C; those with a temperature between 200 and 259°C are referred to as sub-high-temperature pumps； 2. For daily purchases, it’s best to choose reliable manufacturers such as Calit and Sulzer; using their products gives a different experience ； 3. The entrances and exits should be remotely controllable, so that they can be shut off promptly in case of a fire, thereby preventing the accident from spreading; pneumatic valves can be used for this purpose.