Washington Administrative Code
Title 296 - Labor and Industries, Department of
Chapter 296-818 - Abrasive blasting
Section 296-818-30010 - Blast cleaning enclosures
Current through Register Vol. 24-06, March 15, 2024
(1) You must install adequate ventilation systems in blast cleaning enclosures that are able to do all of the following:
(2) You must make sure ventilation systems are designed and operated so employees are not exposed to excessive air velocities.
(3) You must make sure make-up air systems do not interfere with the effectiveness of the exhaust system, and are designed to do both of the following:
(4) You must do both of the following before opening the blast cleaning enclosure:
(5) You must follow the requirements in Table-2, Blast Cleaning Enclosures.
Table-2: Blast Cleaning Enclosures
If you have | Then make sure |
Air inlets and access openings |
They are either baffled or arranged so the combination of inward airflow and baffles minimizes both of the following: -The escape of abrasive or dust particles into adjacent work areas. -Visible spurts of dust |
Small access openings where dust might escape |
Slit resistant baffles are installed in multiple sets at all small access openings, and do both of the following: - Regularly inspect them - Replace them when needed |
An observation window in enclosures where hard, deep cutting abrasives are used |
The window is made of safety glass protected by screening Notes: * Hard, deep cutting abrasives may shatter normal glass. |
* If the safety glass shatters, the protective screening will help contain the glass and protect employees from cuts and lacerations. |
|
Small operator access doors |
They are flanged and tight when closed, and open from both inside and outside the enclosure. Note: If you have a small operator access door and a large work access door, the large work access door may open or close from the outside only. |
References: |
For more information on: |
1. Air velocities, refer to the following: |
|
a. The latest edition of Recommended Industrial Ventilation Guidelines (ACGIH); |
|
b. NIOSH 1976 Industrial Ventilation; |
|
2. Exit routes, go to the Safety and health core rules, WAC 296-800-310. |
Statutory Authority: RCW 49.17.010, 49.17.040, 49.17.050, 49.17.060. 06-12-074, § 296-818-30010, filed 6/6/06, effective 9/1/06.