4 replies to this topic

[vanecnr]

Good Morning 

 

I have a question about the drainage line of a pump, the one that goes to open drainage or closed. How much is de flow that I should consider to dimension this drainage line????? 20% of de design flow of the pump? 

 

Im adding an image of what I mean. 

 

Thank you for your answers

 

Vanessa

Attached Files

•  Imagen1.png   81.91KB   7 downloads

[fallah]

vanessa,

 

As the picture says, the size of drain line from the pan below the pump skid which will conduct the collected liquid mostly due to pump leakage to the funnel, is irrelevant to pump design flow and is typically selected 1" or 1 1/2" per the expected rate of emptying the pan when is full of liquid...

[Pronab]

Drain from a pump casing is 3/4" to 1/2" is enough unless a very big pump. Drain line should route to both Close and open drain. Depending on the fluid handling, if it is BFW or DW can route only to open drain.

 

 

[shan]

Open Drain.  2" to avoid plug and be verified with wash hose flow and rainfall. 

[Sherif Morsi]

Hi,

 

Your sketch shows it's a pump casing drain through the drip pan. This is usually done after shutdown, isolation and depressuring of the system. Hence, we are talking about almost atmospheric pressure.

 

Depending on the nature of the fluid, if it is hydrocarbons, it will be directed to the hazardous open drains system and if it's seawater or potable water (no hydrocarbons), then it should be directed to the non-hazardous open drains.

 

The max line size for this applications I have seen so far is 2".

 

Hope this helps,

Sherif