Fire Extinguishers ✔
Channel: mech explanations
Date: 2018-06-20

this video is all about Fire Extinguishers to know about fire safety ................

Fire Extinguishers | Explanations  :


let  us  learn  about  A  fire  extinguisher.

A  fire  extinguisher  is  an  active  fire  protection  device  used  to extinguish  or  control  small  fires,  often  in  emergency  situations.

It  is  not  intended  for  use  on  an  out-of-control  fire,  such  as  one which  has  reached  the  ceiling,  endangers  the  user  (i.e.,  no  escape route,  smoke,  explosion  hazard,  etc.),  or  otherwise  requires  the  expertise  of  a  fire  brigade. 

Typically,  a  fire  extinguisher  consists  of  a  hand-held  cylindrical pressure  vessel  containing  an  agent  which  can  be  discharged  to  extinguish  a  fire.

Fire  extinguishers  manufactured  with  non-cylindrical  pressure  vessels  also exist,  but  are  less  common.

A  stored-pressure  fire  extinguisher  made  by  Oval  Brand  Fire  Products
In  the  United  States,  fire  extinguishers  in  all  buildings  other  than houses  are  generally  required  to  be  serviced  and  inspected  by  a  fire protection  service  company  at  least  annually.

Some  jurisdictions  require  more  frequent  service  for  fire  extinguishers. 

The  servicer  places  a  tag  on  the  extinguisher  to  indicate  the  type  of service  performed  (annual  inspection,  recharge,  new  fire  extinguisher).
 
There  are  two  main  types  of  fire  extinguishers:  stored-pressure  and cartridge-operated.

In  stored  pressure  units,  the  expellant  is  stored  in  the  same  chamber as  the  firefighting  agent  itself.

Depending  on  the  agent  used,  different  propellants  are  used.  With  dry chemical  extinguishers,  nitrogen  is  typically  used;  water  and  foam extinguishers  typically  use  air.  Stored  pressure  fire  extinguishers  are the  most  common  type.

Cartridge-operated  extinguishers  contain  the  expellant  gas  in  a  separate cartridge  that  is  punctured  prior  to  discharge,  exposing  the  propellant to  the  extinguishing  agent.  

This  type  is  not  as  common,  used  primarily  in  areas  such  as  industrial facilities,  where  they  receive  higher-than-average  use. 

They  have  the  advantage  of  simple  and  prompt  recharge,  allowing  an operator  to  discharge  the  extinguisher,  recharge  it,  and  return  to  the fire  in  a  reasonable  amount  of   time.

Unlike  stored  pressure  types,  these  extinguishers  use  compressed  carbon dioxide  instead  of  nitrogen,  although  nitrogen  cartridges  are  used  on  low  temperature  (-60 rated)  models. 

thank you !!!!