has gained expertise in design, manufacturing, supplying and installation
of complete Blast Room Systems which consists of following main components :
Blast Room Enclosure :
The blast room enclosure can be sheet metal pre fabricated modular
construction with suitable engineered for strength and rigidity. The modular
panels are assembled and bolted together for assembly. Such blast rooms can
have the advantage of shifting to other location if required at later date.
However such construction of metallic nature is costly. Therefore, many
clients prefer missionary construction. Suitable size sheet metal main door on
one side or both the sides are provided. Each door is of two leaf construction
fitted with air louvers and vision window.
The blast room inside wall surface including door surface is protected against
abrasion of flying abrasives by hanging / pasting suitable abrasion resistant
rubber sheets. Suitable arrangements for illumination is provided by fixing
halogen / metal halide lamps with protection frame at suitable locations which
ensures sufficient visibility inside the blast room area.
Portable Abrasive Blaster :
Blast rooms are normally provided with above machines and these machines are
installed just outside the blast room enclosure. Whereas the operator remains
inside the blast room, manipulating the blast gun to accomplish abrasive
blasting process on the job surface. Various models indicating their abrasive
storage capacity and blast nozzle size along with more details are available
under the head ‘portable abrasive blaster’.
Abrasive Recovery System And Separation Unit :
Spent abrasive in the blast room can be recovered in multi ways. However,
following arrangements are more common.
a.) Manual Sweeping :
The spent abrasive is manually swept from the Blast
Room Floor and then it is refilled in Portable Abrasive Blaster for recycling.
b.) Semi Automatic Recovery (Pneumatic) : The spent abrasive from
the blast room floor is swept and pushed into a corner where the abrasive is
collected in a feed hopper and from the feed hopper the abrasive is
pneumatically lifted through elevator pipe and collected in a storage hopper
from where it is gravitationally fed to the portable abrasive blaster.
Therefore abrasive recovery unit model ‘ku – ar’ is cheaper model and save the
time for transporting and loading of the abrasive. This unit pneumatically
lifts the abrasive media and also filter and separates out the fines and
c.) Semi Automatic Recovery (Mechanical) : In this arrangement, a
motorized cross screw conveyor with hopper is installed in a pit. At floor
level suitable grill is provided over the screw conveying hopper. The spent
abrasive from the blast room floor is swept and poured into screw hopper. The
screw conveyor carries the media to the boot of the bucket elevator situated
outside the blast room. From the boot, bucket elevator lifts the abrasive.
d.) Fully Automatic Recovery (Pneumatic) : In this arrangement the
total floor is provided with mini hoppers covered with floor grill. The bottom
of all the mini hoppers are connected through piping to a main pipe. A
suitable vacuum pump of appropriate capacity is installed outside the blast
room and is connected to a main pipe from where abrasive is pneumatically
sucked and transported to the storage tank situated at a suitable height where
abrasive is screened for fines / oversized and usable abrasive is fed to the
portable abrasive blaster. The pit depth required to install the mini hopper
is very small and therefore it is also known as ‘pit less’ media recovery
e.) Fully Automatic Recovery (Mechanical) : In this arrangement the
total floor is provided with numbers of motorized longitudinal screw conveyors
with hoppers and a motorized cross screw conveyor with hopper installed under
the pit. The full floor is provided with the grill. The spent abrasive from
the blast room floor is conveyed through longitudinal screw conveyors and
subsequently through cross screw conveyor to the boot of the bucket elevator
situated outside the blast room. The bucket elevator lifts the abrasive for
subsequent screening / separation and further feeding to the portable abrasive
blaster. This arrangement is also known as full floor media recovery system.
4.) Bucket Elevator With Separator Unit :
The bucket elevator system consists of belt and pulley arrangement
with buckets mounted on the belt. The bucket elevator system is fabricated
from m.s. sheet with boot section of heavy gauge then the trunk and top
section. The arrangement is motorized. The abrasive separator unit has rotary
screen which separates the debris form abrasive. The fines mixed n the
abrasive is air washed and separated. The outcome from the bucket elevator is
through three chute pipes carrying debris & oversize, fines and usable
respectively. The usable abrasive is fed gravitationally to portable abrasive
blaster for recycling.
Dust Collectors (Extractor) Unit : The suitable dust collector is
connected with blast room through ducting. The main purpose is to remove dust
and fine abrasive particles from the blast room environment and collect the
dust and abrasives so that the environment outside the blast room also remains
pollution free. The dust collectors are divided in three major categories
namely cyclone type, fabric bag type, cartridge filter type. Suitable type and
size is selected based on the appropriate air velocity and number of air