01
Feed
Sections enter on driven rollers at a controlled speed. How tightly they are spaced here decides whether the tunnel ever runs empty.
CONTINUOUS PASS-THROUGH
The line only earns while parts are moving.
Plate, pipe, beam and bar cleaned in one uninterrupted pass — throughput set by line speed, not by how fast anyone can load.
- Line speed
- 0.5 – 3 m/min
- Working width
- 600 – 2500 mm
- Blast wheels
- 4 – 8
- Finish
- Sa 2.5 – Sa 3
WHAT ACTUALLY DECIDES OUTPUT
Three numbers decide what a pass-through line produces in a shift.
- Line speed
- 0.5–3m/min
- Set by how contaminated the steel is, not by how fast the line can run. Heavy mill scale needs a slower pass; clean stock does not.
- Working width
- 600–2500mm
- Specify for the widest section you will ever run, plus clearance — never for the average part. Width cannot be added later.
- Wheel count
- 4–8wheels
- How many faces get cleaned in a single pass. Too few wheels means running the part twice, which halves the line's real output.
Get one of the three wrong and the other two cannot compensate for it.
ONE PASS, SIX STAGES
What happens between infeed and primer.
02
Seal
Staged curtains and vestibules hold the abrasive inside the tunnel while the part keeps moving through them.
03
Blast
Wheels above, below and beside the tunnel clean every face at once, throwing abrasive at 70 to 85 metres per second.
04
Recover
Spent abrasive drops through the floor grating to the hopper and returns by screw conveyor and bucket elevator.
05
Separate
The air-wash separator strips out dust and broken media, holding the operating mix steady while the line keeps running.
06
Discharge
Cleaned sections leave on the outfeed conveyor at blast-grade finish, ready to go straight to primer.
Six stages, one pass, no handling in between.
WHAT EXPERIENCED PLANTS WATCH
Pass-through lines rarely fail. They quietly under-produce.
01
Line speed set once, then never revisited
Most lines are commissioned at a single speed and left there for years. Contamination changes with the supplier, the season and how long stock sat outside. A fixed speed either wastes throughput on clean steel or ships under-cleaned steel to the paint shop.
02
The tunnel spends the shift half empty
A pass-through line costs the same to run whether or not a part is inside it. Wheels, dust collector and drives all draw power regardless. Closing the gaps between parts is the cheapest throughput most plants never claim.
03
Recovery sized for the brochure, not the shift
Continuous blasting moves far more abrasive per hour than batch work. When screws, elevators or the separator are specified light, they become the real bottleneck long before the blast wheels ever do.
None of these show up as a breakdown. They show up on the cost sheet.
SPECIFYING THE LINE
What to fix before anyone quotes.
The figures below are Rotoblast's standard build range. Every one of them is a decision that is expensive to revisit once the foundation is poured.
- Working width
- 600 – 2500 mm
- Widest section you will ever run, plus clearance.
- Working height
- 300 – 1500 mm
- Governs the tallest beam or bundle that will pass.
- Line speed
- 0.5 – 3 m/min
- Variable. Slower for heavy scale, faster for clean stock.
- Blast wheels
- 4 – 8, direct drive
- Position decides which faces clean in one pass.
- Wheel motor power
- 11 – 30 kW each
- Sets impact energy, and most of the running cost.
- Abrasive velocity
- 70 – 85 m/s
- The number the cleaning rate is actually derived from.
- Typical finish
- Sa 2.5 – Sa 3
- Blast-cleaning grades to ISO 8501-1. Sa 2.5 leaves at least 95% of each area free of visible mill scale and rust — what most coating specifications call for.
- Power supply
- 415 V, 3-phase, 50 Hz
- Standard Indian and Gulf industrial supply.
- Installation
- Foundation + infeed/outfeed runs
- Plan floor length early — lines need approach space.
PROCUREMENT & SUPPORT
From enquiry to a line that is running to specification.
Lines are engineered and built at our works in Faridabad, India, and supplied to manufacturers, foundries and fabrication companies in India and across the UAE.
- 01
Enquiry
Send the section, the contamination and the tonnage per shift. You receive a configuration sized against those figures and a written quotation for it.
- 02
Order confirmation
A confirmed manufacturing and delivery schedule is issued in writing at order confirmation, against your final agreed configuration.
- 03
Installation and handover
Rotoblast engineers support installation, commissioning and machine setup, and stay with the line until it is meeting the finish your specification calls for.
Manufacturing lead time
Indicative only. Actual delivery depends on machine configuration, customisation, production scheduling, material availability and project scope. Every project receives a confirmed manufacturing and delivery schedule at order confirmation.
What support covers
- Installation
- Commissioning
- Machine setup
- Operator guidance
- Process optimisation
- Troubleshooting
- Long-term technical assistance
Send the part, not the part number.
Line speed, wheel count and width all follow from what you actually run. Tell us the section, the contamination and the tonnage per shift, and an engineer will size the line against it.
Also worth reading
- Tumblast shot blasting machineThe batch alternative, for loose parts that can tumble without damage.
- Table type shot blasting machine
- Spinner hanger shot blasting machine
- Blast wheel assembliesWhat actually does the cleaning inside the tunnel.
- Wear parts and sparesBlades, liners and curtains — most of the running cost.
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- Years of engineering
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- Roller Conveyor machines delivered
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Get in touch
Request a quote
Tell us your application, part size and throughput — we'll respond with a specification and price.
Faridabad, Haryana, India
Mon–Sat, 9:30 AM – 6:30 PM IST