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Regarding negative pressure and zero pressure.

Hello Sir,

1. i have attached the water gems file in which i m getting negative pressure and zero pressure. Why i m getting this value and How can i increase the pressure as i know pressure can not below 7 m of H2O.

Some of the pipe i m mentioning here like P-78, 98, 96 ,95 & P-2 , 5 etc.

2. Please also tell me where i need to use pump or valve.

ZONE - 4.wtg

Parents
  • Negative pressures or zero pressures at junctions can occur due to multiple reasons, first you should check if elevations entered are correct. What are the hydraulic boundaries in the model like tank , reservoir? Are tank operating levels / elevations entered correctly? 

    If the demands cannot be supplied by gravity and you are getting negative pressures everywhere in the model then you could add pump to overcome this. 

    Below are some troubleshooting steps, please go through it. 

    Troubleshooting negative pressures at pumps, junctions, & other node elements 

    Please note that to open the model, we also need zone - 4.wtg.sqlite file which is a database file without which model cannot be opened. Please upload that file. 

    Sharing model files.

    Regards,

    Sushma Choure

    Bentley Technical Suppport

Reply
  • Negative pressures or zero pressures at junctions can occur due to multiple reasons, first you should check if elevations entered are correct. What are the hydraulic boundaries in the model like tank , reservoir? Are tank operating levels / elevations entered correctly? 

    If the demands cannot be supplied by gravity and you are getting negative pressures everywhere in the model then you could add pump to overcome this. 

    Below are some troubleshooting steps, please go through it. 

    Troubleshooting negative pressures at pumps, junctions, & other node elements 

    Please note that to open the model, we also need zone - 4.wtg.sqlite file which is a database file without which model cannot be opened. Please upload that file. 

    Sharing model files.

    Regards,

    Sushma Choure

    Bentley Technical Suppport

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