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What's the difference between the positive pressure and negative pressure?

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تم إضافة السؤال من قبل yousef alfadhli , Mechanical Engineering & Fire protection , Nebras Habwah Engineering consultants & Fire Protection
تاريخ النشر: 2017/10/15
Omar Abuirtaimeh
من قبل Omar Abuirtaimeh , head of fire fighting, security and ELV , horizon gulf electromechanical

positive pressure is when pump suction flooded with water means pump will get the water on suction.

negative pressure when pump suction fare away from water source and have to use other support method to get water from tank as example when tank is in lower level than pump 

Saeed Al Ghamdi
من قبل Saeed Al Ghamdi , Princible Instructor & Training Consultant , Safety Innovations Training Center (SITC)

It depends on where it is used, in fire fighting we use the term positive & negative pressure in the way we ventilate, in this case to use positive pressure is to push air into the building/ structure to prevent smoke & fire products from moving into a certain area like the rescue stairs, and we use smoke extrication fans to pull smoke outside a structure if we decide to use negative pressure ventilation. I hope I have made things clear for you Yousef. Good day, 

Maged Khalil
من قبل Maged Khalil , Quality Assurance /Control Supervisor , SAECO Instrumentation & control ( I&C lab)

Positive pressure is more than Atmosphere pressure & negative pressure is vacuum pressure.

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