Tag Archives: Surface Preperation

Structural Steel

Surface Preparation Standards, Part 2 – Dust Measurements and Considerations

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As an expert in the surface finishing industry, Rosler knows that all the expertise in the world won’t do any good if the surface of the work piece is not properly prepared.

When it comes to structural steel, we receive many questions about preparation. Among the most common questions is, “How is the presence of dust on shot-blasted structural steel components evaluated?”

Understanding dust considerations and mitigation will help produce higher quality and longer-lasting structural steel components more cost-effectively and safely.

The Dangers of Dust

Blast-cleaned structural steel surfaces must be completely free of dust to ensure proper coating and painting. Residual dust will reduce the adhesion of subsequently applied coatings and, by absorbing moisture, may promote the corrosion of the blast‐cleaned steel surfaces.

The potential accumulation of dust is especially critical on horizontal surfaces, the interior of pipes, and inside structural cavities. Special inspections must be carried out to ensure that such areas are adequately cleaned and free from dust before painting.

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Shot Blasting, Structural Steel

Surface Preparation Standards, Part 1 – Evaluating Surfaces Throughout Finishing Processes

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Surface preparation can account for up to 40 percent of structural steel painting and repainting jobs and the life of anti‐corrosion coatings on a steel surface largely depend on how thoroughly the surface was prepared before painting.

At Rosler, we have extensive experience evaluating structural steel surfaces for coating before and after shot blasting. This knowledge of surface preparation standards and the widely used ISO and SSPC standards guide us in developing systems to expertly prepare and repair structural steel throughout its lifespan.

The Standards

Evaluating rust and mill scale pre- and post-shot blasting is a must. It is important to clearly specify the quality of the surface prior to preparation as well as the surface conditions after preparation. As a result, standards were developed to visually assess the initial surface conditions and the quality of the required surface preparation relative to the initial steel surface conditions.

The dominant and widely used standards for evaluating rust and mill scale are ISO 8501‐1:2007 (based on the Swedish Standard SIS 05 59 00) and the SSPC (Steel Structures Painting Council). While different in some minor details, these standards are practically identical.

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Shot Blasting

Air versus Turbine – Balancing Blasting Capabilities and Outcomes, Part 2

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In addition to the pro and con evaluation of air blasting and turbine lasting found in our previous blog, these two methods can also be compared in terms of throwing velocity, applications, and industries.

In terms of throwing velocity. Media thrown by turbines immediately start losing speed the moment that the turbine blade releases it, producing higher intensity blast results closer to the turbine. Larger shot retains its speed better over a distance and is commonly used to maintain intensity while creating a larger blast pattern by positioning the turbine(s) farther away. In contrast, media thrown by air nozzles will continue to accelerate for the first 100-300 mm outside of the nozzle depending on blast pressure and media size and density until the compressed air fully dissipates to the ambient environment, meaning that your best blast results occur a distance away from the nozzle.

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Shot Blasting

Air Versus Turbine – Balancing Blasting Capabilities and Outcomes, Part 1

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Blasting processes for surface finishing vary according to the size, quantity, composition, and desired finish of the work pieces in need of surface preparation. Air blasting and turbine blasting are two of the more common types of blasting. While there is some overlap between the two methods, each carries its own unique attributes and drawbacks.

When comparing these two blast methods, the number one thing to keep in mind is precision versus bulk. Air blasting provides precision surface preparation using a much smaller blast pattern compared to turbine blasting, which delivers large quantities of media over a wide blast pattern, thereby making it ideal for blasting large quantities of parts or larger individual parts.

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Shot Blasting

Clean Fabricated Constructions with Shot Blasting Solutions

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Shot blasting machines come in all shapes and sizes. Selecting a machine capable of cleaning and descaling complex fabricated components and welded constructions is not a task to pursue alone. Seeking the help of a company with proven expertise in the shot blasting field is always advised.

Designed specifically to clean wide head and base plates, ribs, re-enforcements, and the welds from fabrication, shot blast machines, such as roller conveyor machines, are designed around these types of work pieces.

Read more about blast cleaning of welded constructions

Shot Blasting

Blast Cleaning Of Welded Constructions

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These machines are capable of cleaning and descaling complex welded fabricated components and constructions. They are designed specifically to clean wide head and base plates, ribs, re-enforcements along with the welded seams after construction.

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All round blasting is achieved after 3D simulation and actual placement of the blast wheels in the optimum locations of the blast chamber. The chamber can be designed with 2 blast zones, each zone designed to blast clean the surface of the infeed side and the second, the outfeed side and end. As the fabrication passes through the chamber, all gussets, re-enforcements, ribs, angles are descaled and cleaned to Sa Swedish standards and with the desired profile to optimise the adhesion of the coating to be applied.

The equipment requires to easily meet the most stringent customer specifications regarding surface cleanliness and cost, for steel traders, steel fabricators, equipment manufacturers, shipyards and manufacturers of wind power stations. In wind power applications roller conveyor systems are utilised for shot blasting of the steel sheets or plate required for the fabrication of the towers for off-shore and land based windmills.

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Typical applications fall into these fabricating industries:

  • Steel traders/ distributors
  • Steel fabricators
  • Equipment manufacturers
  • Gas and oil
  • Aerospace
  • Power generation – including wind turbine columns
  • Transport – rail, bus, lorry, earthmoving, agricultural
  • Steel portal frame, tower block, stadium and steel construction
  • Bridge , crane, access, scaffolding and lifting gear

Partners for Steel

There are distinct benefits to be offered by the cooperation between the manufacturers of both shotblast equipment and multispindle drill/saw lines. The objective of cooperation (as partners for steel) is to support customers in resolving the interface problems between the various technologies, integrating shotblasting, measuring, marking, drilling and sawing or punching and shearing or coping and profiling thereby offering customers added value and profit from the processing of steel.

Click here for information on cleanliness standards

Click here for information on surface profile

For further information on roller conveyor shot blast machines please click here

 

Haydn Kitchen New APost written by
Haydn Kitchen
Shot Blasting Technical Manager

 

Shot Blasting

A Complete Shotblasting And Painting Line

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The demand for pre-finished quality steel sections, plate and tube is increasing throughout the world, year on year.  Many steel stockholders, distributors, fabricators and shipyards require their steel to be brought to the highest standard of cleanliness and coated for corrosion protection.

 

Preservation Line with Play Button cropped

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Reference Guides, Shot Blasting

Shot blasting – Recognising Steel Production Processes

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Shot blasting of steel plate, profiles, construction, and fabrications is a process to clean, descale, provide a specified surface profile and edge break as a surface preparation. The process detail is subject to the hardness and start condition of the steel and it is vital to know these factors prior to shot blasting and before application of a coating or paint to maximise the adherence potential and corrosion control.

This is a document made up of five parts  on  “How Do You Make Your Coatings Stick Better?”

Section 1 – Specified Consistency
Section 2 – Measurement Terms
Section 3 – How To Measure
Section 4 – Cleanliness and Surface Profile

Continue reading Shot blasting – Recognising Steel Production Processes →

Reference Guides, Shot Blasting

Shotblasting – Cleanliness and Surface Profile

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Shotblasting of steel plate, profiles, construction, and fabrications is a process to clean, descale, provide a specified surface profile and edge break as a surface preparation.  This process takes place prior to a coating or paint application to maximise the adherence potential and corrosion control.

This is a document made up of five parts  on  “How Do You Make Your Coatings Stick Better?”

Section 1 – Specified Consistency
Section 2 – Measurement Terms
Section 3 – How To Measure
Section 5 – Recognising Steel Processes (for hardness of steel)

Continue reading Shotblasting – Cleanliness and Surface Profile →

Reference Guides, Shot Blasting

Shotblasting – Surface Measurement Terms

5 Comments

Shotblasting of steel plate, profiles, construction, and fabrications is a process to clean, descale, provide a specified surface profile and edge break as a surface preparation.   This process takes place prior to a coating or paint application to maximise the adherence potential and corrosion control.

This is a document made up of five parts  on  “How Do You Make Your Coatings Stick Better?”

Section 1 – Specified Consistency
Section 3 – How to Measure
Section 4 – Cleanliness and Surface Profile
Section 5 – Recognising Steel Processes (for hardness of steel)

Continue reading Shotblasting – Surface Measurement Terms →