2 replies to this topic

[100RB]

I have 2 Questions

1) What role does the cane vent play in vertical pumps and what significance does it hold in their operation?

 

2) In a system where both On-spec and Off-spec pumps of ethylene spheres share a common vapor balance line for pump cane vent, which extends to the On-spec sphere and the ethylene fractionator, is there a potential risk of contaminating the Onspec sphere or Fractionator product when operating the Offspec sphere transfer pump, while ensuring that the cane vent line remains directed towards the vapor balance line?

[fallah]

I have 2 Questions

1) What role does the cane vent play in vertical pumps and what significance does it hold in their operation?

 

2) In a system where both On-spec and Off-spec pumps of ethylene spheres share a common vapor balance line for pump cane vent, which extends to the On-spec sphere and the ethylene fractionator, is there a potential risk of contaminating the Onspec sphere or Fractionator product when operating the Offspec sphere transfer pump, while ensuring that the cane vent line remains directed towards the vapor balance line?

 

Hi,

 

To get a proper response, please upload a simple sketch of the system you described...

[shvet1]

Q1 - Vent is critical as it evacuates heat from a pump. ~3% of electric energy in motor is converted to heat, this heat boils ethylene, vaporized ethylene escapes from can and new liquid ethylene comes into can. If vapors stall inside of can then no heat removal, ethylene inside totally vaporizes and motor becomes overheated.

Note that heat transfer coefficient of vaporized ethylene is ~100 much lower than boiling ethylene. It means that 'gas pocket' in can creates a local overheated spot and damages motor the same as above.

 

Q2 - You can find an answer calculating mass balance for the worst case by ourself.

Edited by shvet1, 05 January 2024 - 07:27 AM.