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Hauteur manométrique d'une pompe Hmt

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comment_234938

Bonjour,
 

La hauteur manométrique d'une pompe Hmt = Ha + Hb + Ja (perte de charge)+ Jb (perte de charge)+ Pu (pression résiduel) 

Je cherche à savoir combien on prend Pu ?
 

Merci 

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