Surface Finish Inspection

Surface Finish Inspection

One of the process involved in rubber lining is substrate inspection, surface preparation and Surface Finish Inspection after blasting process. Before that, I want to introduce you all the standard for abrasive blasting cleaning.

Introduction to Industry Standards for Abrasive Blast Cleaning

•ASTM Abrasive Cleanliness Standards

•ASTM Compressed Air Cleanliness Standard

•ASTM Surface Profile/Roughness Measurement Standards

•ISO Dust Assessment Standard

•SSPC Abrasive Standards

•SSPC/NACE Surface Cleanliness Standards

•SSPC Surface Profile Measurement Frequency Standard (draft)

Here the all item that you should control when to use abrasive blasting:

· Quality of equipment and abrasive media

· Establishing process control to monitor quality

· Effect of ambient conditions on final abrasive blast cleaning

· Surface Cleanliness

· Surface profile and roughness

· Post-blast dust inspection

Quality of Abrasive Blast Cleaning Equipment

•Maintain Project Schedule (production)

ØCompressor Capacity

ØBlast Nozzle Wear

ØBlast Nozzle Air Pressure

•Maintain Quality

ØVerify Clean, Dry Compressed Air

•Compressor Capacity

ØRequirements based on multiple factors/conditions.

ØNo. of operators, nozzle sizes and required pressure are important considerations.

ØEquipment manufacturers publish charts for guidance.

•Monitoring Blast Nozzle Wear

ØAbrasive wears opening, reducing productivity

ØWear monitored using Pressure Blast Analyzer Gauge (nozzle orifice gauge)

 •Monitoring Blast Nozzle Pressure

ØReduction in nozzle pressure reduces productivity

ØPressure monitored using hypodermic needle pressure gauge

•Monitoring Compressed Air Cleanliness

ØOil or water in compressed air can contaminate abrasive and surfaces

Ø“Blotter Test” performed per ASTM D 4285

ØRequirement of SSPC Abrasive Blast Cleaning Standards

  In  This article I just will talk about Quality of Abrasive Blast Cleaning Equipment of Surface Finish Inspection. For the other item that you should control just see in the next article or just click on that name to get link. If you have any comment or hestation to ask just put yours in the coment box below.