Pit Furnace
A furnace made in pit for melting metal for taking casting process is called a pit furnace.
It consists of a cylindrical steel shell ,closed at the bottom with a grate and covered with a removable lid.The shell is lined with refractory bricks from inside .Sometimes the furnace is completely made in brick work instead of a steel shall .The draft of the air through the furnace may be a natural draft for low melting temperature metals but a force draft with the help of ablower to accelerate the melting process in case of higher melting temperature metals and alloys.
To prepare the furnace for melting, a deep bed pf coke is kindled and allowed to burn until a state of good combustion is attained .Some of the coke is removed to make place for the crucible .The crucible is then lowered into furnace .The coke is replaced and additional coke is put to surround the crucible on all sides.Metal is then charged in the crucible and the furnace lid is replaced to give natural draft .When the metal melts and reaches the desired temperature .The crucible is removed from the furnace with special long handle tongs. De -gas and de-oxidise the metal when necessary.
A furnace made in pit for melting metal for taking casting process is called a pit furnace.
To prepare the furnace for melting, a deep bed pf coke is kindled and allowed to burn until a state of good combustion is attained .Some of the coke is removed to make place for the crucible .The crucible is then lowered into furnace .The coke is replaced and additional coke is put to surround the crucible on all sides.Metal is then charged in the crucible and the furnace lid is replaced to give natural draft .When the metal melts and reaches the desired temperature .The crucible is removed from the furnace with special long handle tongs. De -gas and de-oxidise the metal when necessary.
The U. S. Federal Trade Commission forces manufacturers of new furnaces or boilers to display their AFUE on their product so that consumers may compare heating efficiencies of various models.
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