A powered roller conveyor moves steel material through a blasting machine available in many sizes and configurations for common I-beams, steel plate, angles, pipe and fabricated structures.

The operation costs are very low compared to the costs of manual air nozzle blasting. It is an economical method of surface preparation before coating works.

Contact us to understand more about the costing for your project.



 

 

 

Skew-Roll Type Pipe Blasting Machines



WEBLAST designs and manufactures many sizes of skew-roll pipe blasting machines to suit each customer production program. Pipes as small an inch diameter to pipe diameter of 3m are all part of WEBLAST production program. 

Skew-Roll Machine at Project Sites


 

Let me show you in a diagram how a blast wheel looks in action.
 

Some people called it a ‘turbine’ which does not describe it correctly.

 

Abrasives flow from the storage tank at a higher level, fed through an abrasive valve to a  wear resistant abrasive hose & enter this ‘blast wheel’ under free gravity fall. The blast wheel is rotating at a high speed of about 3,000rpm. The rotating blades serve like rackets imparting the abrasives in rotating speed to high velocity directed to the work piece in target.

 

The conversion of kinetic energy to propelling the high speed shots on the material surface does the cleaning; like you are using a peening hammer hitting a point on the surface. Except now, there are thousands of hits on the material surface that created the effect of cleaning.

 

Large amount of abrasives leaving the blast wheel, 2kg/sec for a 15HP unit; hence the cleaning speed is so much faster than a manual air blast gun can do only 0.2kg/sec.
 

Large Spiral Pipe Manufacturing Plant

The external surface blasting machine and the surface after blasting; no worry about the rotated marked lines left by the rollers, the finished profile is achieved.

Internal pipe blasting requires the same blast wheel to do the job in order to match near the speed of in line production works. Shown above right is a test piece result.

WEBLAST has its pipe internal blasting systems proven capable of blasting at a production speed of 1.5 m2/min with the most minimal power requirement compared to having it done by a compressed air nozzle blasting means.

 

The system requires about 1.5 tons of steel abrasives of a shot and grit combination, to run the blasting works continuously. Very low amount of abrasives needed for each run because the system is fully automatic in continuous blast recovery, abrasive cleaning and separation storage recycling.

 

The system however has its limitation in doing pipe sizes 24” and below since the smaller pipes won’t accommodate the entry of a 11kW blast wheel. We used a smaller blast wheel of 7.5kW for pipe diameter in between before we add in another adaptation with compressed air rotary nozzles for blasting of still smaller pipes.

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POWERED GUIDED FLOOR BLAST MACHINE

Concrete surface and steel floor shot blasting machine is a cost-effective and environment friendly method for preparing concrete and steel surfaces. It is widely used for its easy operation and high productivity. The shot blasting machine leaves the surface immediately ready for application of coatings. 

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Available Common Models

 

Blast Width	200	270	350	550
Wheel kW	7.5	11	15	2x11

C/W

> Dust Collector Unit & Hoses

> Easy to Operate Control

> Grit Consumption is Low 

The workshop friendly production cleaning tool



It is a batch production equipment, hence is not for high volume production works that need quantity & cleaning speed.

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Available Sizes:

Table Diameter (m)	1.2	1.8	2.4
Works Height (m)	0.9	1.2	1.5
Blast Wheel (kW)	2x4	2x7.5	2x11

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Suitable for:

> Low volume production works

> Odd size components such as steel casting, engine block & pipe fittings

> Surface cleaning and stress relieving after heat treatment process

> Complete with dust collector and control system

 

Blasting Rooms & complete supplies

An equipment development from history to the modern full floor recovery design.



Sweeper recovery system. Abrasive cleaning & air pollution free comfort - nozzle blasting

 

Abrasive Vacuum Recovery with Roots Blower Pump

What does a roots blower do? Roots blowers are used to generate constant airflows that are independent of discharge pressure conditions. Root blower applications are limited to low and medium pressure and vacuum processes and can be used to provide small to large airflow rates.

The Open University   Three Lobes Blower

PRESSURE APPLICATIONS OF ROOTS BLOWERS   There are many industrial pressure roots blower applications, from assisting in combustion by pumping air or gas into burners, furnaces and forges to pressurizing paper mill head boxes. The following are some major areas of application: Combustion, Drying & dehydration, Aerating & Agitating liquid, Pneumatic conveying.

VACUUM APPLICATIONS OF ROOTS BLOWERS   Roots blowers are frequently used as vacuum pumps. As a result, industrial vacuum roots blower applications are widespread and include the following: Bottle and tube filling machines Dust collecting Drying Garment presses Industrial and commercial vacuum cleaning Mechanical mat formers Paper folding machinery Pump priming Vacuum:-9.8～-50kPa  Suction Flow:0.52 ～183.9m3/min

 

Vacuum Recovery 75-90kw – Used for suction of used steel grit or used copper slag inside the tank after blasting works. Recovery Capacity is at 4-10tons per hour



The vacuum unit assembly puts in action with options to include larger storage silo, continuous auto-dumping, abrasive separation and stream line charging to blast pot machines.

Generally, one can expect a 20-25% breakdown rate at 90-110 psi at the nozzle with garnet sand of 30/60 size.   The recycled abrasive should be checked to ensure that the separation unit is removing both oversized coarse contaminants (typically 20 mesh or larger) and fines (typically 80-90 mesh or smaller). The abrasive discharged from the air-wash separator (into the trash/dust bin) should also be checked to determine if usable abrasive is being improperly withdrawn from the working mix.    The most accurate way to determine the exact distribution of the working mix of the abrasive particles is to conduct a sieve analysis. Complete instructions and procedures on the use of test sieves are contained in ASTM STP 447, Manual on Test Sieving Methods. For a detailed sieve analysis, use #20, #30, #40, #50, #60, #70, #80, #90, #100 and #120 mesh USA Standard Sieve screens. A full set of screens is invaluable for monitoring the particle size distribution of the working mix.   A short-cut method used to reduce the complexity of conducting a complete sieve analysis is to select the “critical” screen for the blasting application where recycled garnet is being used. For example, to check for excessive fines in the working mix, use a single #80 or #100 mesh screen. To check for too much usable garnet being extracted by the air-wash separator, use a single #60 mesh screen. This will give a relative indication of how well the recycling process is being managed and identify any potential problems.

WEBLAST has practical experience with recycling in blast rooms and on field projects. We are familiar with a variety of designs for recycling equipment, as well as abrasive handling and flow issues encountered during recycling. 

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Specialized 3LPP Blasting & Coating Facility

How it is done

 

on straight pipe & on long radius pipe elbow

 

3-Layer Polypropylene (3LPP) is a multilayer coating composed of three functional components; a high performance Fusion Bonded Epoxy (FBE) primer, followed by a copolymer adhesive, and an outer layer of polypropylene which provides one of the toughest, most durable pipe coating solutions available.
 
This special structure protects the material from a number of conditions and materials. The 3lpp pipeline coating is excellent in preventing the steel pipes from being in contact with corrosive chemicals and agents. Also the coating prevents the material from coming into contact with any hard surface directly and prevents physical damage as well.
 
The 3lpp coated pipe can come in different specifications such as DIN 30670, CSA Z245.21, AS 4321 and IS 3581. The coating is also resistant to cathodic disbondment, meaning the coating is not affected by electric charge which can damage most other types of coatings. The 3lpp pipe can last longer and has higher performance compared to non – coated or other types of coatings. The application of this special coating is mostly in the oil fields which operate under high temperatures. The Three Layer Polypropylene Coated Pipe can be used in abrasion prone applications such as drilling operations and in rocky surface applications.

WEBLAST design and fabricate facility for 3LPP coating of long radius pipe elbow, specifically for a national petroleum piping plant in an Asean country.



Hang up the work piece and convey it in through a blast room, oven chamber and a powder spray booth.

 

A typical long radius pipe elbow is about 8m long or less. The processes include a loading bay to hang up the work piece onto an overhead monorail conveyor system which runs in a straight line from loading to finishing unloading area.

 

The surface preparation begins with shot blasting in a modern blast room fully installed with all needed equipment to do the job in a safe and pollution free environment. 

 

The work piece with a blasted surface prepared to SA 2.5 Swedish standard and a surface profile of between 70 to 100 microns will have to be heated up in an oven chamber before the powder spraying FBE process. The temperature needed for powder coating here is 250 deg C.



A tense powder spraying process on a test piece & a final coating of up to 3000 microns thick coating.

 

The process of spraying 3 coating layers to form the final finish product required a timely coordinated work done together by a few sprayers for powder fusion before the material temperature drops below the temperature needed for effective fusion coating.

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Summarized Product Brochures

Roll-Conveyor Section Blasting Machine

Section Blasting Machine Models References

Machine Mobilization to Site

Skew-Roll Type Pipe Blasting Machine

Skew-Roll Machine at a Project Site

Large Spiral Pipe Manufacturing Plant

Floor Coating Plate / Concrete Blasting Machine

Rotary Table Blasting Machine

Blasting Rooms & Complete Supplies

High Suction Capacity Industrial Vacuum System

Garnet Recovery Dryer Separation Equipment

Specialized 3LPP Blasting & Coating Facility