If possible can any body share the following information with me
When sand blasting is mandatory?
Is there any standard that dictates the operation of Sand Blasting? Is there any standard procedure available?
How is it ensured that the required level of surface finish has been achieved?
What should be the quality of sand that is to be used in sand blasting? Is there any gauge to measure the quality of sand?
Thanks in advance...
Sand Blasting
-
Imran.Idris
- Core Member
- Posts: 59
- Joined: 16 Mar 2010, 04:22
- Area of interest: Chemical Engineering
Re: Sand Blasting
1. Sandblasting is mandatory on new installations for surface preparation before painting and on those old pipes where painting is to be carried out again for better surface protection against environmental conditions.
2. Standard procedures are always made considering the application and requirements for surface protection. It depends on what is the actual demand of level of surface finish necessary to apply painting layer. You can refer to different standards like ISO-8504-2 for abrasives to be used in blasting on carbon and low alloy steels.
3. General requirements include that with sandblasting surface shall be made free of dirt, greese, burrs, loose scale, rust, flux, welding spatters and other foreign material. There are different grades of surface finish Sa 1 - Light blast cleaning, Sa-2 - Thorough blast cleaning, Sa-2 1/2 - Very thorough blast cleaning, Sa-3 - cleaning to visual steel super finish. It's your specifications which determine that what grade of surface finish is required or to be achieved.
4. Sand to be used for blasting must be free of silica and chloride.
2. Standard procedures are always made considering the application and requirements for surface protection. It depends on what is the actual demand of level of surface finish necessary to apply painting layer. You can refer to different standards like ISO-8504-2 for abrasives to be used in blasting on carbon and low alloy steels.
3. General requirements include that with sandblasting surface shall be made free of dirt, greese, burrs, loose scale, rust, flux, welding spatters and other foreign material. There are different grades of surface finish Sa 1 - Light blast cleaning, Sa-2 - Thorough blast cleaning, Sa-2 1/2 - Very thorough blast cleaning, Sa-3 - cleaning to visual steel super finish. It's your specifications which determine that what grade of surface finish is required or to be achieved.
4. Sand to be used for blasting must be free of silica and chloride.
Re: Sand Blasting
Regarding the standards for surface preparation, you must look into the following:
SSPC SP 7 - for cleaning to grade Sa 1 (light)
SSPC SP 6 - for cleaning to grade Sa 2 (thorough)
SSPC SP 10 - for cleaning to grade Sa 2.5 (near white metal)
SSPC SP 5 - for cleaning to grade Sa 3 (white metal)
Go through ISO 8501 also for surface preparation guidelines.
ISO 8054 would guide you through with what level of surface finish is to be achieved. It lists down some of the important factors need to be considered while selecting the grade of surface preparation.
SSPC SP 7 - for cleaning to grade Sa 1 (light)
SSPC SP 6 - for cleaning to grade Sa 2 (thorough)
SSPC SP 10 - for cleaning to grade Sa 2.5 (near white metal)
SSPC SP 5 - for cleaning to grade Sa 3 (white metal)
Go through ISO 8501 also for surface preparation guidelines.
ISO 8054 would guide you through with what level of surface finish is to be achieved. It lists down some of the important factors need to be considered while selecting the grade of surface preparation.
-
Imran.Idris
- Core Member
- Posts: 59
- Joined: 16 Mar 2010, 04:22
- Area of interest: Chemical Engineering
Re: Sand Blasting
Thanks a lot for your valuable inputs.