Interface types of high-temperature centrifugal pumps
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I came across a requirement in the engineering specifications for centrifugal pumps that states: \"Horizontal centrifugal pumps operating at temperatures above 200°C should use a ‘top-entry, top-exit’ connection type.\" As far as I know, high temperatures mainly affect the material selection and cooling methods for pumps; why do they also affect the location of the interfaces? If it involves inlet and outlet at the top, then according to the API pump types, only BB-type pumps are available. Does such a requirement impose many usage restrictions?
Thermal expansion and contraction cause leakage at the interface, right?
Thermal expansion and contraction cause leakage at the interface, right?
Is there any inevitable connection between this temperature and the interface? . . I was previously involved in pumps that handle high-temperature heat transfer oil at over 300 degrees. . . The design institute didn’t have any requirements regarding this interface either. .
It doesn’t seem completely impossible; are you referring to the interface flange? I wonder if there are any engineering examples
These are the engineering specifications for centrifugal pumps issued by a foreign engineering company; they set somewhat higher requirements compared to API 610, but this particular requirement is indeed a bit hard to understand. The API also only specifies that a radial split design should be used at temperatures above 200°C
I’m not a designer, just guessing: if the flow is from top to bottom, the thermal stress in the pipelines will ultimately be absorbed vertically by the pump’s foundation, which means it has a relatively minor impact on the pump； If other forms are used, the thermal stress of the pipeline will act horizontally on the pump body, easily causing problems such as vibration. Well, it’s just relative. In fact, when designing pipes, design institutes generally conduct stress analysis to ensure that the thermal effects do not exceed the stress levels at pipe ends specified by API 610. When foreigners work on engineering projects, they make some ridiculous mistakes in terms of details; if A has 99 yuan and B has 99.01 yuan, it will think that B is richer than A.
This isn’t a mandatory requirement; the API doesn’t specify anything such as this. Is it because of the design of the pipelines on site that the pump is designed to be vertical?
It’s possible. . I’ve encountered it before. . . He installed all the pipelines on site in advance. . It turns out there isn’t enough space. . Just call us. . We must make it such that things can move in and out. . .
Why does a high operating temperature lead to insufficient installation space? If you have them changed to an inlet at the top and an outlet at the bottom, do you need to select a new type, or should a bend be added before the inlet?