Centrifugal Blast Cleaning

Question 1

The most complex of the centrifugal blast cleaning cabinets are designed to blast large quantities of steel on a regular basis, such as all plate received by a ___ ___ ___.

Answer 1

Shipbuilding yard.

Question 2

The machines are often known as ____.

Answer 2

Wheelabrators.

Question 3

These machines are designed to work on a continuous basis and include a conveyor system to carry item through the cabinet continuously. It is common for these cabinets to use a system of ___ ___ with ___ to propel the abrasive.

Answer 3

Rotating Wheels with Vanes.

Question 4

Wheelabrators usually also have an abrasive ___ and ___ system and are capable of very high rates of cleanings.

Answer 4

Recovery and recycling.

Question 5

Blasting with a wheelabrator machine is often highly ____ and is best suited to repetitive blasting tasks at a fixed location.

Answer 5

Automated.

Question 6

Typical locations include ___ or ___ ___ fabrication facilities, such as those used for building oil production platforms and their ancillary equipment.

Answer 6

Shipyards and steel structure fabrication facilities.

Question 7

Wheelabrators are used in a stationary setup when work can be ___ to the equipment.

Answer 7

Brought.

Question 8

Wheelabrators are used for ___, ___ surfaces when a portable wheelblast unit can be driven across the surface, such as on the flight deck of an aircraft carrier, or on concrete surfaces such as floors, pits, etc.

Answer 8

Large, Flat Surfaces.

Question 9

Wheelabrators are used to eliminate the need for a ___ ___ including air hoses, an abrasive pot and a pot attendant.

Answer 9

Compressor setup

Question 10

Wheelabrators are used for lower ___ ___.

Answer 10

Production costs.

Question 11

Wheelabrators are used on work pieces such as pipe, piling, reinforcing steel, beams, flat plate, etc, with a series of centrifugal ___ ___ in a blast enclosure, arranged so all sides of the work are cleaned as it travels through the equipment.

Answer 11

Blast Wheels

Question 12

Inspectors should be aware of the various kinds of centrifugal blasting units in operation today. The plant operation unit, in general, consists of the following:

1. ___ tables.
2. ___ collectors.
3. ___-___ ovens.
4. Blast ___.
5. Paint ___.
6. ___ booth.
7. ___ equipment.

Answer 12

1. Roller Tables.
2. Dust collectors.
3. Pre-heating ovens.
4. Blast Cabinet.
5. Paint Booths.
6. Drying Booths.
7. Handling Equipment.

Question 13

Surface cleanliness standards are the same as those used in ___ ___ ___.

Answer 13

Dry abrasive blasting.

Question 14

As with abrasive blasting, the centrifugal blasting operation should use ____-__ preparation standard before blasting begins.

Answer 14

SSPC-SP1

Question 15

ISO standards are ___ but not ___ to the NACE/SSPC Joint Standards.

Answer 15

Similar but not equivalent

Question 16

NACE No. 1

SSPC-SP 5

Answer 16

White Metal Blast

Question 17

NACE No. 2

SSPC-SP 10

Answer 17

Near White Blast

Question 18

NACE No. 3

SSPC-SP 6

Answer 18

Commercial Blast

Question 19

NACE No. 4

SSPC-SP 7

Answer 19

Brush Off

Question 20

Dangers with centrifugal blasting are:

1. Overhead ___ moving plate or pipe.
2. ___ and __ in the air. (Use proper PPE)
3. ___ ___ moving during inspection of the work piece.
4. ___ plates or pipes when checking the temp of the piece.
5. Use caution when between the ___ __ and the ___ ___ when checking the anchor pattern.
6. ___ ___ movement when checking the DFT.
7. __ __ when load-out is in progress.
8. Always wear the proper PPE.

Answer 20

1. Cranes
2. Dust and Debris
3. Roller Tables
4. Pre-heated.
5. Blast Cabin and the Paint Booth.
6. Roller conveyor
7. Overhead movement.

Question 21

The steps for centrifugal blasting inspection are basically the same as those discussed in the ___ ___ section of this chapter.

Answer 21

Air Blasting.