Blasting Technical Information Mc Finishing-Books Pdf

BLASTING TECHNICAL INFORMATION MC Finishing
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BLASTING TECHNICAL INFORMATION,FACTORS THAT AFFECT BLAST FINISHING ARE. 1 Media delivery systems, 2 Blast containment enclosures media recovery and dust collection systems. 3 Media used in industrial blasting systems,1 MEDIA DELIVERY SYSTEMS. There are three media delivery systems that propel and deliver media for high speed. impact to the part being processed,A Air Blasting Pneumatic. B Mechanical Wheel airless blasting,C Hydro blasting pumped water.
A AIR BLASTING utilizes an air compressors energy to deliver air media mix at. speeds and volumes to impact the parts being processed. The air speed or pressure of an air compressor is controlled by a pressure regulator. The regulator can increase or decrease the speed of the media delivery Air pressure is. measured by pounds per square inch psi industrial blasting is effectively done. between 20 and 90 PSI The higher the PSI the higher the air speed. The volume delivered of the air media mix is determined by the orifice or opening. diameter of the nozzle with pressure blast systems or air jet diameter of the suction. blast gun body Air volumes are measured by surface cubic feet per minute scfm. The larger the orifice ID opening the larger volume of air media Other factors that affect. volume of air into the blast system is media and air hose diameter Increased air. pressure PSI also increases the SCFM with a given size orifice. Industrial blasting gun bodies of suction cabinet blast systems range between 12 to 38. SCFM The pressure blast cabinet systems range between 12 to 68 scfm and the. pressure blast room systems use up to 254 scfm, Industrial air compressors produce approximately 4 5 SCFM per horse power hp. Blasting cabinets require 3 to15 hp compressors per nozzle and blast rooms can use up. to 53 h p per man or nozzle,BLASTING TECHNICAL INFORMATION. THERE ARE TWO TYPES OF AIR BLAST DELIVERY SYSTEMS,Suction used in blast cabinets. Pressure used in blast cabinets blast rooms and outdoor blasting. SUCTION blasting uses the venture principle sucking media from a hopper The air jet. is 1 2 the ID of the nozzle and as the air stream is passed through both it creates a low. pressure which sucks the media from the hopper into the air stream The media. acceleration distance is very short from the nozzle to the workpiece approximately. 4 to 14 The suction systems work fine and can be continuously blasted as long as. there is blasting media in the hopper,Suction systems do not deliver media. well at very low air pressures 5 to 25,psi and they have limits on how long.
the suction feed hose can be Very,heavy blasting larger steel media. cannot be conveyed into the air stream,with suction blasting Most industrial. blast cabinets are suction systems,and work well with most medias. PRESSURE blasting utilizes various sizes of ASME approved pressure vessels called. pressure pots The pressure pot contains the media and as it is energized with. compressed air it pressurizes the pot When the air media mix is released from the pot. it accelerates from the pot through at least 5 10 feet of hose and then even faster as it. travels thru the ventura of the nozzle The acceleration rates of air media mix are much. higher in pressure blasting than suction,blasting When the pressure pot. empties of the media and air the,pressure pot has to be depressurized to.
refill the pot with media The pressure,blasting systems are much more. productive when blasting than suction,systems Pressure systems can blast all. medias regardless of weight or size and,can also deliver medias at very low psi. BLASTING TECHNICAL INFORMATION,AIR BLAST SYSTEMS AIR CONSUMPTION RATES. Below are charts of air volume SCFM used in blasting with pressure and suction. systems utilizing various pressures PSI and orifice sizes. CABINET BLAST SYSTEMS AIR REQUIREMENTS,Suction Systems Pressure Systems.
Suction Blast Air Requirements scfm Pressure Blast air requirements scfm. Pressure psi 30 40 50 60 70 80 90 100 Pressure psi 20 30 40 50 60 80 100 120. 1 4 nozzle 3 32 jet 6 7 8 10 11 12 13 15 1 8 nozzle 6 8 10 13 14 17 20 25. 1 4 nozzle 1 8 jet 10 12 15 17 19 21 23 26 3 16 nozzle 15 18 22 26 30 48 45 55. 5 16 nozz 5 32jet 15 19 23 27 31 37 38 42 1 4 nozzle 27 32 41 49 55 68 81 97. 7 16 nozz 7 32 jet 31 38 45 52 59 66 73 80 5 16 nozzle 42 50 64 78 88 113 137 152. 3 8 nozzle 55 73 91 109 126 161 196 220,BLAST ROOMS AND OUTDOOR SYSTEMS AIR REQUIREMENTS. Air consumption and media delivery rates are much higher on blast rooms and outdoor. blasting systems than in pressure blast cabinets The air supply hose ID the media. blast hose ID the nozzle ID the pressure pot and pot piping are all much larger on the. blast rooms than cabinet systems The increase in production is also due to the further. distance that the nozzle is from the work piece in blast rooms creating a larger blast. Pressure blast requirements blast rooms,Nozzle ID Pressure 60 70 80 90 100 120. 3 16 AIR CFM 30 33 38 41 45,3 Air compressor horse power 7 7 5 8 9 5 10. Lbs Sand hour 171 196 216 238 264,1 4 Air CFM 54 61 68 74 81 97. 4 Air compressor horse power 12 13 5 15 16 5 18 21 5. Lbs Sand hour 312 354 406 448 494 582,5 16 Air CFM 89 101 113 126 137 152.
5 Air compressor horse power 20 0 22 5 25 5 28 0 30 5 34 0. BLASTING TECHNICAL INFORMATION,Lbs Sand hour 534 604 672 740 812 912. 3 8 Air CFM 126 143 161 173 196 220, 6 Air compressor horse power 28 0 32 0 36 0 38 5 44 0 49 0. Lbs Sand hour 754 864 960 1 052 1 152 1 320,Nozzle ID Pressure 60 70 80 90 100 120. 7 16 Air CFM 170 194 217 240 254 300, 7 Air compressor horse power 38 0 43 5 48 5 53 5 56 5 67 0. Lbs Sand hour 1 032 1 176 1 312 1 448 1 584 1 800,1 2 Air CFM 224 252 280 390 338 392.
8 Air compressor horse power 50 0 56 0 62 5 69 0 75 0 87 5. Lbs Sand hour 1 336 1 512 1 680 1 856 2 024 2 352,AIR BLAST PRODUCTION RATES. Blast nozzle spray patterns are affected by orifice size air pressure and distance. from the workpiece, The total diameter of the blast pattern increases as the distance from the workpiece. is increased The hot spot where work speed is maximized can be obtained at. larger distances from the workpiece with pressure air blast systems. CABINET SUCTION BLASTING CABINET PRESSURE BLASTING. BLASTING TECHNICAL INFORMATION,CABINET BLAST PRODUCTION RATES. Below is an estimate of abrasive delivery rates per hour and sq ft of blast area in. sq ft per minute with various orifice I D s and 80 p s i. I D CFM PSI Blast Area Sq Ft Minute Abrasive Unit Hr. 3 32 7 80 1 2 80 lbs,1 8 15 80 1 to 1 1 2 120 lbs,5 32 25 80 1 to 2 1 2 160 lbs. 3 16 40 80 3 to 3 1 2 216 lbs,1 4 80 80 4 to 4 1 2 400 lbs.
BLAST ROOM AND OUTDOOR BLAST PRODUCTION RATES, BLAST SPECIFICATIONS ESTIMATED BLAST CLEANING RATES. NO 1 WHITE METAL BLAST SSPC SP5 7 NOZZLE, Approx Sq Ft Cleaning Per Hour Loose Mill Scale 170 Sq Ft Tight Mill Scale 140 Sq Ft. at 90 PSI Pitted Paint 85 Sq Ft Layered Paint 70 Sq Ft. NO 2 NEAR WHITE BLAST SSPC SP10 7 NOZZLE, Approx Sq Ft Cleaning Per Hour Loose Mill Scale 180 Sq Ft Tight Mill Scale 146 Sq Ft. at 90 PSI Pitted Paint 90 Sq Ft Layered Paint 72 Sq Ft. NO 3 COMMERCIAL BLAST SSPC SP6 7 NOZZLE, Approx Sq Ft Cleaning Per Hour Loose Mill Scale 420 Sq Ft Tight Mill Scale 270 Sq Ft. at 90 PSI Pitted Paint 200 Sq Ft Layered Paint 140 Sq Ft. NO 4 BRUSH OFF SSPC SP7 7 NOZZLE, Approx Sq Ft Cleaning Per Hour Loose Mill Scale 840 Sq Ft Tight Mill Scale 835 Sq Ft.
at 90 PSI Pitted Paint 830 Sq Ft Layered Paint 825 Sq Ft. For more information on blast specifications contact SSPC org. B MECHANICAL WHEEL BLASTING, Wheel blast system utilizes a high speed rotation wheel using. centrifugal force to propel the media The wheel size design. and rotation speed affect the velocity and pattern of the media. BLASTING TECHNICAL INFORMATION, The abrasive is fed into the rotating wheel The impact on the media by the hard. rotating wheel usually restricts media selection to a very tough steel or stainless steel. shot or grit, Machines can be built with multiple wheels for automation Automated systems include. basket table spinner hangers and continuous conveyor processing. Wheel blast systems are a less expensive way to blast due to higher media. recycleability and automation than air blasting by a factor of 10 Their disadvantage. are restrictions to very few media,C HYDRO BLASTING. This blasting system uses a pressurized water stream generated by pumps that are. capable of pumping an abrasive charged water supply at high rates of speed. The Hydro Systems are good for conveying very fine abrasives They are also used. in cleaning gunky greasy parts and containing toxic materials. The wet blast systems are very good at blasting surfaces without damage and. blasting internal surfaces, ALL INDUSTRIAL BLAST SYSTEMS HAVE THE FOLLOWING COMPONENTS.
Delivery Systems Air or Wheel Blasting, Containment Systems Hand cabinets Automated enclosures and Blast rooms. Reclaim Systems,Dust Collection,Containment Systems. Hand cabinets automated enclosures and blast rooms are built to handle various. size and shapes of parts The containment systems are built to control and. contain the blast media and parts within the enclosures The enclosure systems use. gravity for the blasted media to drop down to a collection area so the media can. be conveyed to the reclaim system Blast systems can have inexpensive or. premium containment systems Matching the right containment system to the. application is very important,BLASTING TECHNICAL INFORMATION. Media Reclaim Systems, Recoverable medias used in industrial blast systems will run from 5 to 100. times through the blast system These recoverable medias need to be. cleaned sized and returned to the blast system after being blasted The media. reclaim system accomplishes this The reclaimer keeps finish and production. rates consistent Media reclaim systems can be Air Cyclones or Mechanical. Dust Collection, All Industrial blast systems utilize dust collectors to allow blast systems to.
be indoors The dust collector removes the fine blasting dust keeping the. media clean and operators safe through visibility and breathable air Dust. collectors remove 99 of 1 micron or larger material Hepa filters can be. added to remove dust particles down to 1 2 micron Dust collectors are sized to the. cabinet size media type and amount of blast nozzles or wheels being used. BLAST MEDIAS, Recoverable blasting medias are used in industrial blasting Indoor blasting. systems require medias with extended life Blast media type shape size. and hardness affect the process and materials they re capable of blasting. Spherical medias are used for peening and produce smoother surface finishes. Angular medias chip at a parts surface removing paint rust and scale quicker. with better results than round medias Angular medias produce a rougher. surface finish and produce superior anchor patterns for paint and coating. adhesions Higher blast pressures increase production but reduce media life. Blasting harder workpieces also reduces media life. Recoverable blasting medias have two basic shapes Round spherical. and angular The most common recoverable industrial blast medias are. Spherical shaped media Angular shaped media,Ceramic beads Aluminum oxide Silicon carbide. Glass beads Ceramic grit Stainless grit,Stainless shot Crushed glass Steel grit. Aluminum Oxide AL2O3 is a man made fused alumina that is very tough angular. blocky shaped medium density with a hardness of 9 on the Mohs scale This. BLASTING TECHNICAL INFORMATION, abrasive is designed for high blasting pressures up to 90 PSI Aluminum. oxide is very good for light deburring and surface prep bonding strength. prior to painting and coating AO creates a dull matte finish Aluminum oxide has media. life of approximately10 12 times through the blast system. Typical Aluminum Oxide blasting applications, cleaning of investment castings Grit Size Conversion for AO and SIC.
Scale removal Grit Size Inches average Micronts average. Thermal spray coating prep 16 0 043 1092,Rust removal 20 0 037 942. Hard oxide removal 24 0 027 686,Heat treat and mill scale removal 30 0 022 559. Glass frosting and etching 36 0 019 443,Monument lettering and carving 46 0 014 356. Air craft engine overhaul 54 0 012 305,Matte finishing 60 0 010 254. surface prep 70 0 008 203,durability up to 20 passes 80 0 0065 165.
No free silicas 90 0 0057 145,100 0 0048 122,120 0 0048 102. 150 0 0035 89,180 0 0030 76,220 0 0025 63, Silicon Carbide SIC is a man made abrasive that is very sharp and friable SC is very. hard at 9 5 on the mohs scale It is used to blast very hard. materials such as tool steels glass and ceramics SC. creates a dull matte finish The grit sizes available are the. same sizes as aluminum oxide SC blasts at pressures up. to 90 psi and has an approximate life of 9 12 times thru the. blast system, Typical Silicon Carbide blasting applications Sizing same as aluminum oxide. Blasting hard metals,Glass etching,Ceramic recast removal. Very tough scale removal,Heavy profile and metal preparation.
Before brazing and weld applications requiring no aluminum oxide contamination. BLASTING TECHNICAL INFORMATION, Glass Beads and Glass Grit Glass bead is a round glass used in peening and surface

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