Steel Pipe Shot Blasting Machine DN114-1420 mm
Overview
A pipe shot blasting machine looks simple, and that is precisely why it is usually the weakest stage in a coating line. Two wheels throw abrasive at the pipe, a conveyor turns the pipe, dust is extracted, and abrasive is returned. The result that matters is not the motor rating but the condition of the steel surface the coating will actually be applied to, and that surface changes slowly and invisibly as consumables wear. A wheel blade wears and the throw speed drops. The control cage wears and the abrasive pattern spreads. The separator loses efficiency and broken abrasive is recirculated. None of these shows up as a fault; they show up months later as an adhesion problem or a coating that fails a test it used to pass. So this machine is supplied with the measurements that make wear visible: abrasive flow rate, wheel speed, achieved cleaning grade and profile depth, each with a recommended check interval. The other things this standalone machine has to get right are separation quality, because that is where performance is quietly lost, and dust extraction, because on a production line the extraction capacity sets how long the machine can run between cleaning stops rather than only whether it complies.
Key Configuration
Two 75 kW direct drive blast wheels with replaceable blades and control cages, mounted so that the pattern is set for the diameter range rather than for a single size. Abrasive circuit of screw conveyor, bucket elevator and adjustable air separator, sized for a flow of about 1,900 kg/min with fines removal. Three-stage dust collection with cartridge filters and automatic cleaning, sized for continuous duty rather than for intermittent operation. Blast chamber with replaceable wear liners on the impact faces and an inspection door for maintenance. Spiral conveying with motorised pipe chasing, with a roller conveyor alternative for heavy wall pipe. Cleaning grade to Sa 2.5 or Sa 3 to ISO 8501-1, with profile measurement and a recording sheet. The machine is supplied as a standalone stage, so the inlet and outlet heights and the conveyor pitch are quoted against the line it will be fitted into.
Steel Pipe Shot Blasting Machine — Technical Specifications
| No. |
Parameter |
Specification |
| 1 |
Model / Type |
Steel pipe shot blasting machine, single process stage |
| 2 |
Pipe Diameter Range |
DN114 – DN1420 mm (4" – 56") |
| 3 |
Processing Capacity |
600 m²/h nominal, dependent on diameter and line speed |
| 4 |
Blast Wheels |
2 × 75 kW direct drive; wheels positioned to suit the diameter range |
| 5 |
Abrasive Flow Rate |
1,900 kg/min at 72 – 85 m/s wheel speed |
| 6 |
Cleaning Grade |
Sa 2.5 – Sa 3 to ISO 8501-1, with the achieved grade recorded |
| 7 |
Surface Profile |
Measurable and logged per pipe; typically 50 – 100 microns |
| 8 |
Abrasive Types |
Steel shot, steel grit or wire cut, selected by the required profile |
| 9 |
Abrasive Recovery |
Screw conveyor, bucket elevator and air separator with dust extraction |
| 10 |
Dust Collection |
Three-stage: primary drop-out, cartridge filters, final stage with automatic cleaning |
| 11 |
Separation Quality |
Separator adjusted so that fines and broken abrasive are removed rather than recirculated |
| 12 |
Conveyor |
Spiral conveying with motorised pipe chasing, or roller conveyor for heavy wall |
| 13 |
Blast Chamber |
Wear liners on the impact faces, replaceable without removing the wheels |
| 14 |
Maintenance Access |
Platform and inspection door, with the chamber in a safe state |
| 15 |
Wear Parts |
Wheel blades, control cage, liners and abrasive hose are the consumption items |
| 16 |
Electrical Supply |
380 V, 50 Hz as standard; quoted for site supply |
| 17 |
Noise and Emissions |
Enclosures and extraction quoted against local workplace requirements |
| 18 |
Operators per Shift |
1 |
| 19 |
Warranty |
12 months machine; 24 months drive train |
| 20 |
Certification |
ISO 9001
|
Blasting is the stage that decides everything downstream, and it is also the stage most often run on worn consumables because the effect is gradual and invisible until a coating fails.
The two figures that matter are the cleaning grade achieved on the steel and the profile depth it leaves, and both should be measured rather than inferred from a setting.
Abrasive flow rate and wheel speed set the profile, and both fall as wheel blades and the control cage wear, which is why the consumption items determine the result more than the motor rating does.
Separation quality is where a blasting machine quietly loses performance: broken abrasive recirculated back into the wheels gives a shallower profile and more dust for the same power.
Dust collection is not only an environmental item. On a pipe line it also determines how often the operator has to stop and clean, which is a production figure.
Pipe is loaded onto spiral conveying with motorised pipe chasing, which turns the pipe as it passes so the wheels cover the full circumference. Wheel position and chase speed are set to the diameter so that coverage is complete without over-blasting thin wall. Abrasive is thrown at 72 to 85 m/s at a flow of about 1,900 kg/min, and the two wheels are arranged so that the impact patterns overlap on the working surface. As the pipe leaves the blast zone, spent abrasive and dust fall into the hopper, are carried by screw conveyor to a bucket elevator, and pass through an air separator that removes fines and broken abrasive before the reusable abrasive returns to the wheels. Dust goes to a three-stage collection system with automatic filter cleaning. The pipe is then checked for cleaning grade and profile, and both are recorded. Wear items, the wheel blades, control cage, chamber liners and abrasive hose, are inspected on a defined interval rather than on failure, because their condition is what determines the profile.
1. Pipe diameter: 118-820mm
2. Processing capacity: 600 m²/h nominal, dependent on diameter and line speed
3. Cleaning level: ≥Sa2.5
4. Materials for production: epoxy powder, adhesive, polyethylene
Standards Compliance
Cleaning grade and surface profile are referenced to ISO 8501-1, with the achieved grade recorded per pipe rather than assumed from a setting. Abrasive grade and mixture are quoted against the profile the coating system requires, because a profile that is too shallow or too deep will fail the same coating specification in different ways. Dust emission and workplace noise are quoted against the local requirement at the buyer's site rather than against a general figure, and where a permit condition applies we ask for it at quotation stage.
Applications
Incoming pipe cleaning ahead of a coating line; a standalone blasting shop supplying several coating lines; second stage blasting after a first rough clean; re-blasting of pipe that has been stored and oxidised; preparation before a tape or liquid coating system; preparation of pipe for inspection and dimensional checking. Buyers are frequently plants that already have a coating line and need more blasting capacity, or fabricators who only do the preparatory stage and sell cleaned pipe onward. In the first case the machine is quoted against the existing line's pitch and speed rather than as an isolated unit, because a blasting machine that is faster than the line it feeds has no value.
Service & Support
Installation and commissioning are supervised on site by 2 to 3 engineers over 15 to 30 days. Operators are trained until they can run and adjust the line without supervision. The documentation package is in English and includes layout, foundation drawings, electrical schematics, P and ID and machine manuals. A two-year spare parts package can be supplied with the line, and critical wear parts are despatched by air within 72 hours of a confirmed order. Warranty covers the main machine for 12 months and the screw, barrel, motor and gearbox for 24 months.
Why Choose Qingdao Huashida
Blasting is a stage we build for every coating line and for our own pipeline companies, including lines where the blast chamber has to be arranged around a blast pit for large diameter pipe. Our anti-corrosion machinery carries a Shandong Province First-Set Technical Equipment award, and because we operate coating plants ourselves we set our wear inspection intervals from our own production records rather than from a supplier recommendation.
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