Gritco BM-18 Operation instructions

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Original Manual
Air blast assembly
BM - 18/40/60/100/140/200 - EXC
/VRFTHPc3s
Manufacturer: Official distributor:
Klompenmakerstraat 16d
NL-2984 BB Ridderkerk
the Netherlands
Tel: [phone]
Fax: [phone]
E-mail: [email protected]
URL: http://www.gritco.com

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TABLE OF CONTENTS
1. PREFACE............................................................................................................... 5
2. SAFETY INSTRUCTION ........................................................................................ 5
3. INTRODUCTION / DATA........................................................................................ 6
Theory ..................................................................................................................... 7
4. DESCRIPTION ....................................................................................................... 8
Overview of the machine ......................................................................................... 8
5. INSTALLING......................................................................................................... 13
6. OPERATION ........................................................................................................ 14
Metering the amount of blast media ...................................................................... 15
Emergency stop..................................................................................................... 15
7. TRANSPORT AND STORAGE ............................................................................ 16
8. MAINTENANCE CHECKLIST .............................................................................. 17
9. TROUBLESHOOTING.......................................................................................... 18
10. EXECUTING REPAIRS / MAINTENANCE ......................................................... 20
11. STOCK ............................................................................................................... 22
12. DRAWINGS........................................................................................................ 22

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1. PREFACE
This manual is to be read by the operator(s) and maintenance people. Both should
have knowledge and skills considering blasting systems.
Failure to properly use of this machine could result in severe injuries or death.
Read this manual first before operating the machine.
Keep this manual in a safe place for future reference and spare part orders.
2. SAFETY INSTRUCTION
Always respect local regulations regarding installation and use of the machine.
Used blast media should be disposed according the local regulations
Be aware that blasting activities can result in static electricity and/or sparks.
Consult local authorities or your supplier for suitable measures too avoid any risks!
The use of the machines is only allowed with:
-suitable non-bleeding positive deadman handle or remote control system
-suitable blast hose and blast hose couplings
-suitable nozzle
Contact your supplier or the manufacturer for detailed info.
Only use original parts for maintenance and repair.
Only use accepted blasting media. Never use blast media containing free silica!
Never direct the installed blasthose and nozzle towards yourself or others.
Never perform any maintenance or disconnect hoses when the machine is in use.
The sound level is determined by blasting pressure, nozzle orifice and (amount of) blasting
media. The sound level at the nozzle can be between 100 - 125 dB. The sound level at the
operator and the machine itself will be lower.
Furnish the operator(s) with approved:
- helmet or mask,
- respiratory equipment,
- protective clothing,
- safety shoes or boots,
- gloves,
- ear protection
Also warn and/or protect people nearby the blasting process with the above items.

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3. INTRODUCTION / DATA
This machine is for surface treatment purposes like: cleaning, paint and/or rust removal,
surface roughening, surface embellishing etc.
This is done by directing blasting media with compressed air through a hose and nozzle onto
the surface. The impact of the blast media onto the surface results in physically removing dirt
or paint or the distortion of the surface.
Dimensions (mm): model 18: 560 x 460 x 790 model 100: 800 x 700 x 1130
(l x w x h)model 40: 570 x 560 x 920 model 140: 870 x 840 x 1250
model 60: 700 x 510 x 1060 model 200: 870 x 840 x 1440
Vessel contents: model 18: 18 litres model 100: 100 litres
model 40: 40 litres model 140: 140 litres
model 60: 60 litres model 200: 200 litres
Weight: model 18: 45 kg model 100: 110 kg
model 40: 55 kg model 140: 150 kg
model 60: 80 kg model 200: 170 kg
For all models: Maximum system pressure: 10 bar
Minimum system pressure: 5 bar
Maximum compressed air temperature: 50 °C
Minimum compressed air temperature: 5 °C
Maximum ambient temperature: 50 °C
Minimum ambient temperature: 5 °C
Maximum pressure changes
ΔP bar 18 litre 40 litre 60 litre 100 litre 140 litre 200 litre
0 – 6 – 0 790.500 707.330 489.310 211.510 298.410 298.410
0 – 8 – 0 391.100 365.230 206.290 89.274 143.200 143.200
0 – 10 – 0 226.500 215.410 105.750 45.723 75.043 75.043
Coupling connections: Compressed air: Claw coupling acc. DIN 3481/3489
Remote control hose: Quick coupling acc. DN 7,2 / DN 5
Blast hose: European standard
beware that the used
compressor does not
exceed this value!

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Make sure the compressor has the right capacity to ‘feed’ the chosen nozzle and wanted
blasting pressure.
The compressed air consumption of the machine is determined by the blasting pressure and
the used nozzle orifice diameter:
Compressed air consumption in m³/minute
Diameter Blasting pressure in bar
mm 2 3 4 5 6 7 8 9 10
3 0,08 0,25 0,33 0,42 0,50 0,58 0,66 0,75 0,83
4 0,30 0,44 0,59 0,74 0,89 1,03 1,18 1,33 1,48
5 0,46 0,69 0,92 1,15 1,38 1,62 1,85 2,08 2,31
6 0,66 1,00 1,33 1,66 1,99 2,33 2,66 2,99 3,32
7 0,90 1,36 1,81 2,26 2,71 3,17 3,62 4,07 4,52
8 1,18 1,77 2,36 2,95 3,55 4,14 4,73 5,32 5,91
9 1,50 2,24 2,99 3,74 4,49 5,23 5,98 6,73 7,48
10 1,85 2,77 3,69 4,62 5,54 6,46 7,39 8,31 9,23
11 2,23 3,35 4,47 5,59 6,70 7,82 8,94 10,05 11,17
12 2,66 3,99 5,32 6,65 7,98 9,31 10,64 11,96 13,29
13 3,12 4,68 6,24 7,80 9,36 10,92 12,48 14,04 15,60
For data on other nozzles or pressures please contact your supplier or the manufacturer.
Theory:
The pot of the machine is filled with blasting media and then pressurised. When the machine
is started an air flow with the same pressure starts flowing underneath the pot through the
blast hose to the nozzle Because pot pressure and transportation air pressure are the same, the
blasting media can fall freely inside the transportation air and is directed onto the surface.

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4. DESCRIPTION
Overview of the machine:
# Item description Function
01 Cover (option) Avoids foreign objects entering the pot.
02 Sieve (option) Avoids too big particles entering the pot.
03 Vessel Contains the blast media
04 Inspection hatch To check the inside of the pot for maintenance purposes.
A Quick couplings Connects the machine to the control hoses
# Item description Function
01 Decompression valve Depressurises the tank (filling, stopping).
02 Silencer Silences the decompression of the tank.

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# Item description Function
01 Main air valve Controlled by the control system to start and stop blasting.
Pressurising the vessel and start/stop of transportation air flow.
02 Pressure gauge (option R) Indicates the set pressure by the pressure reducer.
03 Pressure reducer (option R) To set the wanted blasting pressure.
04 Compressed air filter (option F) Takes out last bits of dirt and moisture from the compressed air.
05 System ball valve Pressurises the machine.
06 Choke valve Shuts of transportation air (no blasting pressure) for ‘pushing’
small blockages through the abrasive metering valve.
07 Safety valve Avoids a too high pressure of the tank (10 bar)
08 Gauge system pressure Indicates the system pressure (from compressor).
09 Helmet air filter (option H) Removes the oil odour from the compressed air.
A Claw coupling Connects the machine to the compressed air line.

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# Item description Function
01 Coupling To release the metering valve from the machine’s vessel.
02 Housing Connects vessel, metering valve and mixing tube together
03 Media metering valve PU 12 Opens and closes by signal of the deadman handle or controlsystem
to start and stop the flow of abrasive from the pot. Also to set the
amount of media.
04 Coupling To release the metering valve from the machine’s piping.
05 Mixing tube Where abrasive and transportation air are mixed.
A Blast hose coupling Connects the machine to the blast hose of the hose package.
# Item description Function
01 Ball vibrator (option T) Keeps the abrasive in motion for better flow (especially with very
fine angular and/or hygroscopic material.
02 Pressure reducer (option T) Sets the maximum pressure of the ball vibrator
03 Ball valve (option T) To start/stop an regulate the ball vibrator