Steps%20to%20a%20More%20Effective%20Power%20Tool%20Cleaning%20Presented%20by:%20Earl%20Bowry,%20Jotun%20Paints,%20Inc

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Steps to a More Effective Power Tool
CleaningPresented by Earl Bowry, Jotun Paints,
Inc
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Introduction

• This webinar will explain power tool cleaning and
  how to effectively remove loose rust, loose mill
  scale, and loose paint.
• The presentation will describe two types of power
  tools, electrical and pneumatic
• It will describe how the use of high efficiency
  particulate air (HEPA) will reduce air pollution
• It will describe how power tools are used for
  spot cleaning of damaged coatings, when
  contamination of adjacent areas by abrasive is
  unacceptable and when a surface-tolerant coating
  such as oil-based paint is to be used

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Power Tool Cleaning

• Is a method of preparing steel surfaces by the
  use of power assisted hand held tools

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Power Tool Cleaning

• Cleans by impact, abrasion or both
• Used frequently for spot cleaning of damaged
  coatings
• Is commonly used to clean difficult to reach
  areas or missed areas after abrasive blasting
• Is used when other forms of surface preparation
  are not possible or cost effective

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Power Tool Cleaning

• Two Basic Types
• Electric
• Air Driven

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Power Tool Cleaning

• Pros
• Can be done in confined areas or where abrasive
  blasting will damage sensitive equipment
• Cons
• Slow and physically tiring for the operator
• Power tool cleaning media wears out and has to be
  replaced during the work

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Power Tool Safety

• Eye and face protection is required to prevent
  injury caused by flying particles
• Ear protection is required because of the loud,
  constant noise
• Wear gloves, boots and hard hats if the
  particular job requires it

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Power Tool Safety

• Never run electrical tools in wet areas
• Use ground fault interrupters
• Use respirators to filter dust and debris
• Power tools can create sparks, so take care when
  using near volatile vapors and combustibles

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Contractor Safety Responsibilities

• Provide proper safety equipment for the job being
  performed
• Train workers to use the safety equipment

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Worker Safety Responsibilities

• Be familiar with the safety equipment provided
• Make sure safety equipment is in good working
  condition
• You are responsible for your actions!!

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Owner Safety Responsibilities

• Assure that proper safety practices are followed

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Types of Power Tools

• 3 different types of power tools used for surface
  preparation
• Impact cleaning tools
• Rotary cleaning tools
• Rotary impact cleaning tools

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Common Electrical and Pneumatic Equipment

• Sanders
• Wire brushes, wheels grinders
• Chipping hammers
• Scalers
• Rotary/Impact tools
• Needle guns

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Sanders
Important note Grit size and distribution
(open/closed) are important factors
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Wire Brushes, Wheels Grinders
Important Note Wire type and hardness are
important factors
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Chisel Scaler
Important Note Generally used for large scale
particle removal
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Flapper Wheels
Use Can quickly remove heavy layers of rust and
paint.
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Rotary/Impact Cleaning
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Needle Guns
Important Note Needles can get dull fast and may
need to be replaced several times in a work shift
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Reduction of Air Pollution

• High efficiency particulate air (HEPA) vacuum
  lines attached to reduce air pollution and
  collect debris produced in cleaning operation

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HEPA

• High-efficiency particulate air
• HEPA is a type of air filter
• To qualify as HEPA by US government standards, an
  air filter must remove (from the air that passes
  through) 99.97 of particles that have a size of
  0.3 micrometers or larger

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Specifications

• The specifications governing power tool cleaning
  are
• SSPC-SP 3, Power Tool Cleaning
• SSPC-SP 11, Power Tool Cleaning to Bare Metal
• SSPC-SP 15, Commercial Grade Power Tool Cleaning
• ISO 8504-3, Hand and Power Tool Cleaning

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SSPC-SP 1, Solvent Cleaning

• SSPC-SP 3, SSPC-SP 11 and SSPC-SP 15 require
  removal of all oil, grease, dirt, etc. in
  accordance with SSPC-SP 1, Solvent Cleaning,
  before cleaning with power tools

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SSPC-SP 3, Power Tool Cleaning

• Removal of loose rust, loose mill scale, and
  loose paint to degree specified
• Intact materials may remain such as
• Mill scale
• Rust
• Paint
• Materials considered intact if they cannot be
  removed by lifting with a dull putty knife

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SSPC-SP 3, Power Tool Cleaning

• Specified when rigorous surface preparation is
  not required, such as a dry interior

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SSPC-SP 11, Power Tool Cleaning to Bare Metal

• Remove tightly adherent materials to produce a
  surface that is visibly free from all rust, mill
  scale and old coatings
• No staining permitted
• Slight residue permitted in bottom of pits if the
  original surface was pitted
• Requires a 1 mil minimum surface profile

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SSPC-SP 11, Power Tool Cleaning to Bare Metal

• Examples of circumstances where this
  specification may be applied are
• Touch-up of welded or damaged areas of erection
  assemblies
• Reducing volume of hazardous waste produced by
  abrasive blasting
• Cleaning around sensitive equipment or machinery

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SSPC-SP 15, Commercial Grade Power Tool Cleaning

• Requires the removal of all paint, rust, mill
  scale and other foreign matter
• Allows random staining on 33 of each unit area
  (9 in2)
• Slight residue permitted in bottom of pits if the
  original surface was pitted
• Requires a 1 mil minimum surface profile

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ISO 8501

• Combines hand and power tool cleaning in one
  standard
• Has two grades of Cleaning
• St 2 Remove all oil, dirt and poorly adhering
  mill scale, rust, paint and foreign matter
• St 3 Same as St 2 but more thoroughly cleaned
  until a metallic sheen is observed

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Surface Profile

• ASTM D4417, Method B (Unless Otherwise Specified)
• Digital Surface Profile depth micrometer

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Profilometer
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Surface Profile SSPC-PA 17

• Procedure for Determining Conformance to Steel
  Profile/Surface Roughness/Peak Count Requirements
  
• Describes a procedure suitable for shop or field
  use for determining compliance with specified
  profile ranges on a steel substrate

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SSPC-VIS 3

• Guide and Reference Photographs for Steel
  Surfaces Prepared by Power- and Hand-Tool Cleaning

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SSPC-VIS 3

• This guide describes the use of reference
  photographs depicting the appearance of
  unpainted, painted, rusted, and welded hot-rolled
  carbon steel prior to and after power and hand
  tool cleaning
• These photographs are intended to be used to
  supplement the written SSPC power and hand tool
  surface preparation standards

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SSPC-VIS 3 Initial Conditions

• Condition A Steel surface completely covered
  with adherent mill scale little or no rust
  visible
• Condition B Steel surface covered with mill
  scale and rust
• Condition C Steel surface completely covered
  with rust little or no pitting visible

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SSPC-VIS 3 Initial Conditions

• Condition D Steel surface completely covered
  with rust pitting visible
• Condition E Previously painted steel surface
  light colored paint applied over blast cleaned
  surface, paint mostly intact
• Condition F Previously painted steel surface
  zinc-rich paint applied over blast cleaned steel,
  paint mostly intact

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SSPC-VIS 3 Initial Conditions

• Condition G Painting system applied over mill
  scale bearing steel system thoroughly weathered,
  thoroughly blistered, or thoroughly stained

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SSPC-VIS 3 Steps

• Determine initial condition of steel
• Select the photograph of the condition that most
  closely represents the appearance of the steel to
  be cleaned
• Determine the power tool cleaning level to be
  achieved (SP 3, 11 or 15)
• Select the tool to achieve the specified level of
  cleanliness
• Use the photos in VIS 3 that represent the end
  condition based on the proper tool and specified
  level of cleanliness (i.e., SP 3/PWB)

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Summary

• Use of portable power tools- pneumatic and
  electric- is common for cleaning operations.
  Through careful selection and use of the great
  variety of power tools and accessories, many
  cleaning operations can be accomplished rapidly
  and produce satisfactory surface conditions with
  reasonable labor costs and good paint life

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• Questions?????