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ABRASIVE SAND-BLASTING

PROCEDURE

DOC. NO. : PR/TSE/005A

ABRASIVE SAND-BLASTING PROCEDURE Document No. : PR/TSE/005A

Revision No. : 0

Issued Date

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: Mar 5, 2014: 1 of 4

TABLE OF CONTENTS

1. INTRODUCTION

2. SCOPE

3. APPLICATION

4. STANDAR OF MEASUREMENTS

5. TOOLS AND EQUIPMENTS

6. PERSONAL PROTECTIVE EQUIPMENT

7. PREPARATION

8. SAND-BLASTING MATERIALS

9. AIR SUPPLY AND AIR COMPRESSORS

10. DUST ACCUMULATION CONTROL

11. MANUAL VALVE OF ABRASIVE BLASTING NOZZLE

12. GENERAL SAFETY CONSIDERATIONS

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1. INTRODUCTION

Sandblasting is the process of spraying abrasive material is usually a silica sand or steel

grit with a high pressure on a surface in order to eliminate contamination of materials

such as rust, paint, salt, oil, etc.. It also aims to create a profile (roughness) on the surface

of the metal so the paint adhere better.

There are 3 (three) type sandblasting process:

Sandblasting usual, namely to remove paint primer coating.

Sweep blast remove paint to paint the outer base layer.

Sweep, just clean, without removing the paint.

2. SCOPE

This procedure is specific to applicable for all applications regarding the operation of any

sand-blasting activities.

3. APPLICATION

Sand-blasting activities commonly used. Recognizes the hazards associated with

working in close proximity of such operations and in order to ensure the safety of itssand-blasting, and will inform to be aware of the conditions that could cause them to be

injured.

4. STANDARD OF MEASUREMENTSThere are 3 (three) standard roughness commonly used :

SA 2Thorough blast cleaning: Commercial finish 65% cleanthe surface shall be free from visible oil,

dirt and grease, from poorly adhering mill scale, rust,paint coatings and foreign matter. Any

residual contamination should be firmly adhering.

SA 2.5 Very thorough blast cleaning: Near white metal 85% cleanThe surface shall be free from visible

oil, dirt and grease, from poorly adhering mill scale, rust,paint coatings and foreign matter. The

metal has a grayish color. Any traces of contaminationshall be visible only as slight stains in the

form of spots or stripes.

SA 3Blast cleaning to pure metal: White metal 100% cleanthe surface shall be free from visible oil,

dirt and grease, from poorly adhering mill scale, rust,paint coatings and foreign matter. The

blasted surface must have a uniform metallic color.

5. TOOLS AND EQUIPMENT

Air Compressor Minimum 390 CFM, High Pressure Air Supply Hose, Hard Hat, Safety

Shoes, Airline Respirator, Blasting Hood, Gloves,Ear Muffs, Coverall, Apron, Blasting

Gun, Regulator, Filter, Dust Mask and Surface Profile Comparator to see the level of

surface roughness after sandblasting.

6. PERSONAL PROTECTIVE EQUIPMENT

Equipment for protection of the eyes and face shall be supplied to the operator when the

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respirator design does not provide such protection and to any other personnel working in

the vicinity of abrasive blasting operations.

Appropriate personal protective equipment includes the use of a full sandblast outfit consisting of

a rigid blasting helmet with air-flow control valves and filters approved for such use (example:

Bullard supplied-air hood), disposable full-body protective clothing, steel-toed leather boots, and

leather gloves.

Stand-by persons shall wear dust hazard protection consisting of goggles and a proper

dust-control respirator, standing upwind of the operation. Workers shall discard

disposable clothing and change into clean clothing before leaving the work site.

7. PREPARATION

Irregular surfaces such as sediment, dirt welding, porous surfaces,

sharp edges, layers of sediment, and the crust, diper should be discarded or repaired.

Areas where the grinding process is required after blasting, must be cleared in order to

obtain the appropriate profile.

The process of dry cleaning by blasting is not permitted for the surface to be wet from the

blasting and before painting, or a surface that is less than 5 degrees above the dew point

or relative humidity of the air when it is greater than 85%.

Metal surface is clean after blasting process to be coated is not. be allowed to stand for

over 2 hours. Highly specialized treatment and cares should be applied to the work of

blasting near the surface of the flange and the like. Surfaces should be given protection

during the blasting and coating (coating)

8. SAND-BLASTING MATERIALS

Grit sizes of solid particles with 18-40 silica sand or steel grit.

The materials used as abrasive (abrasive) in blasting shall be free of dust and other

impurities. Such materials may only contain a maximum of 100 ppm chlorine (Cl).

9. AIR SUPPLY AND AIR COMPRESSORS

Air supply and air compressors are in minimum 390 CFM to create a steady air pressure

of at least 100 PSI to blast the sand fastenough. Air for abrasive-blasting respirators must

be free of harmful quantities of dusts, mists, or noxious gases, and must meet the

requirements for supplied-air quality.

10. DUST ACCUMULATION CONTROL

Dust shall not be permitted to accumulate on the floor or on ledges outside of an

abrasive-blasting enclosure, and dust spills shall be cleaned up promptly. Aisles and

walkways shall be kept clear of steel shot or similar abrasive which may create a slipping

hazard.

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11. MANUAL VALVE OF ABRASIVE BLASTING NOZZLE

The blast cleaning nozzles shall be equipped with an operating valve which must be held

open manually. A support shall be provided on which the nozzle may be mounted when it

is not in use.

12. GENERAL SAFETY CONSIDERATIONS

The identified sand-blasting unit and all accessory equipment shall be inspected prior to

use, including any blast hose, the lock-pin for the crows foot connection to the sandblastpot, the spray nozzle condition, and the remote control dead-man valve on the nozzle.Any observed signs of excessive wear will be reason for replacement before use. (Hose

joints or extra connections are not allowed at this time.)

The flanged pop-up valve shall be in the up position before the blast tank can be pressurized. After use, do not shut off the air compressor until the blast pot is

depressurized.

Appropriately worded safety signs shall be posted to warn unauthorized personnel of the

sandblast area of operation, and that proper personal protective equipment is required to

be worn in this designated work area.

The blower shall not be positioned where it will recycle sand or other particles from the

blasting process. Used blasting agents shall be removed from the work area at the end of

the blasting period, and in such a manner as to avoid dust dispersal (vacuum pick-up or

wet-down and shovel), followed by proper disposal of spent abrasives. (Blasting agents

are used to prepare the newly fabricated metal surfaces for primer and finish-coat

enameled paints.)

All personnels subject to silica exposure from sand-blasting operations shall be provided

with information about the adverse health effects, safe work practices, hazard

communication, and proper use and care of all PPE.

Engineering control methods can be used to decrease exposure to silica dust, by using

alternate blasting media, containment methods such as blast cleaning machines &

cabinets, blasting rooms or portable equipment.