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Sunday, April 2, 2017

Sand Blasting

 

Dear Readers,
 
Sand blasting is one of the surface cleaning process for structural steel. Sandblasting is a general term used to describe the act of propelling very fine bits of material at high-velocity to clean a surface. Sand used to be the most commonly used material.


As per ISO and Swedish standard, Surface preparation by blast cleaning is designated by the letters "Sa". Swedish standards has been accepted worldwide. As per standards Sand blasting is classified under four category namely Sa1, Sa2, Sa 2 ½, & Sa3.


Brief descriptions are as follows. 
Sa1 = Light Blast Cleaning
Sa2 = Through Blast Cleaning
Sa 2 ½ = Very through blast cleaning
Sa3 = Blast cleaning to visually clean Steel

“Sa” means Swedish air blast similarly “St” means Swedish tool cleaning. Detailed description of each grade is as follows.

Blasting Grade Sa 1: It is a light blast cleaning. Loose mill scale, rust and foreign matter must be removed. When viewed without magnification, the surface shall be free from visible oil, grease and dirt, and from poorly adhering mill scale, rust, paint coatings and foreign matter.

Blasting Grade Sa 2: It is a through blast cleaning. Almost all mill scale, rust and foreign matter must be removed.  When viewed without magnification, the surface shall be free from visible oil, grease and dirt, and from poorly adhering mill scale, rust, paint coatings and foreign matter. Any residual contamination shall be firmly adhering.

Blasting Grade Sa 2 ½: It is a very through blast cleaning. This grade is very often used in construction industry. Mill scale, rust and foreign matter must be removed to the extent that the only traces remaining are slight stains in the form of spots or stripes.

Blasting Grade Sa3: Blast cleaning to pure metal. Mill scale, rust and foreign matter must be removed completely and it shall have a uniform metallic colour.
Notes.
1). Surface cleaning should be mention along with rust grade. For example B Sa2, here first letter "B" represents rust grade.

2). Prior to blast –cleaning, any heavy layers of rust shall be removed by chipping. Visible oil, grease and dirt shall also be removed.

3). Finally the surface is cleaned with a vacuum cleaner, clean dry compressed air, or a clean dry brush before painting.

For More Details about surface preparation of structural steel click Here
For More Details about grades of rust click Here
 

Thursday, March 2, 2017

Seventh Blogoversary

Dear Readers,

I am very glad to inform you that Engineer diary blog has been passed another year. yes, it is a Seventh blogoversary. I would like to take this opportunity to thank each and every one of you who has stayed with us along our incredible journey for the past Seven years.
 
It was my long dream that share the technical knowledge and data’s to others, especially for engineers, technicians and others who are being involved in construction industry. Accordingly, Seven years ago, I wrote my first blog post, having no idea where it would lead me or how it would change my life, but I was very sure that demand for technical data will be always exists and I believed that I can do better some extent. Hope new comers in construction industry benefited through this blog. Hope I am moving in right direction without change my core value (This blog is not for time pass)
 
Dear Readers,

Click here to get more
Seventh Blogoversary for Engineer Diary
Crane & Crane Man
Provided by MasterGreetings.com

 
I know that I am moving little bit slow regarding the quantity of posts (Total 144 posts blogged during these period and 20 posts during last year) This is due to more conscious about the technical data, we realize how important it has become to us as well as to you, and we promise we will keep it up with quality information.
 
I have received so many loving emails and comments through the years because of this blog, which makes my heart beyond happy. I have made so many amazing friends through the years because of this blog. I love that so much. I am so grateful to everyone who has supported this blog with love, behind the scene advices, wonderful comments and likes, introducing the blog to people, etc. I really do appreciate.
 

Once again, thanking you to each of you who have offered support here along the way.
 
-Crane  & Crane Man.

Sunday, February 5, 2017

ISMB UNIT WEIGHT

Dear Readers,

ISMB - Indian Standard Medium Weight Beam. This weight chart is republished here. It has been a popular post of this blog. However it is necessary to update the table for more information like dimensions of Web and Flange including thickness apart from unit weight.
 

Beam cross section looks like a English letter I or H. It is a Hot rolled Steel, The horizontal element is called flanges, while the vertical element is called web and it is a Hot rolled steel

For More Details about classification of Hot rolled steel click Here
For More Details about the unit weight of all beam click All in One
 

Best Quote :- Do the difficult things while they are easy and do the great things while they are small. A journey of a thousand miles must begin with a single step. Have a Nice Day
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