Surface Preparation for Structural Steel

Dear Readers,

Effective life of coating of anti-corrosive paint applied to a steel surface is to a very large extent dependent on how thoroughly the surface has been prepared prior to painting.

 

Removing contamination and increasing surface roughness will allow maximum bond strength and adhesion to develop between coating and substrate. If the coating is applied to a well prepared substrate, they will have strong adhesion to that substrate and may be able to withstand these condition.

 

Coating performance is directly related to the quality of surface preparation.

 

Method of Surface Preparation 

1.       High Pressure Fresh Water Washing

2.       Solvent Cleaning or Degreasing

3.       Manual methods of Surface Preparation

4.       Power tool Methods of Surface Preparation

5.       Dry Abrasive Blasting

6.       Rotary or Wheelabrator blasting

7.       Slurry Blasting

8.       Hydro blasting

Blasting Standards

1.       ISO Standard (8501-1)

2.       Swedish Standards ( SIS 05 59 00)

3.       Steel Structure Painting Council Standards (SSPC-SP)

4.       British Standards Institution (BS4232)

5.       NACE Standards (National Association of Corrosion Engineers)

6.       JSRA Standards (Shipbuilding Research Association of Japan)

7.       Major Local Shipyard Standards

Wire Gauge Table

Dear Readers,
 
Gauge systems and are used to represent the thickness of the wire or diameter of the wire. In Great Britain wire gage has been legalized. Following gauges are available in industrial usage. 

   1. British Sheet & Hoop Iron Standard Gauge (Birmingham Gauge)

   2. U.S.Standard Gauge for Sheet & Plate Iron & Steel

   3. Birmingham Wire Gauge (or Stabs'iron  wire or Warrington Gauge)

   4. British Imperial Standard Wire Gauge

   5. American Steel & Wire Co.(or Washborn & Moen or Rocbling or Steel Wire Gauge)

   6. Washbrn & Moen Steel Music Wire Gauge

   7. New American Steel & Wire Co. music Wire Gauge

   8. American or Brown & Sharpe Wire Gauge

Dimensions of above said wire gauges are listed below. Specific usage are mentioned bottom of the table (Represented as Column-2, Column-3, etc.,). All dimensions are in mm. Click on Picture to enlarge

 

Column-2 : Used in great Britain for sheets and strips but in the United States only for strips (for black sheet see columns 3 and 4)

Column-3 : This gauge is used in the United States for black sheet

Column-4 : Used in Great Britain and the United States for wire (in the United States also used for black sheet and strips)

Column-5 : Used in Great Britain for iron and steel wire ; in the United States it is also used for copper wire.

Column-6 : The United States Bureau of Standards combines these gauges under the name " Steel Wire Gauge. "This is the most widely used gauge for wire in the United States.

Column-7 & 8 : For music wire

Column-9 : Used in the United States for nonferrous wire and sheets. The fractions have been approximated. 

Overall as the gauge number decreases, the thickness of the wire increases. Note that 000000 are pronounced " Six aught" . Similarly is an abbreviation for 0000 is pronounced " four aught" and so on.