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W505 Control of Hazardous Substance


This W505 course aims to:

Describe the ways in which exposure to hazardous substances arises in the workplace, and to introduce the methodologies and technologies available to control exposures and thereby reduce risks to health. 

On successful completion of this module the student should be able to: • describe how airborne contaminants are generated by industrial processes, how this impacts on the control strategy, and how control solutions can thereby be optimised; • recognise the range of approaches to risk reduction embodied in the hierarchy of control and select appropriate strategies for implementation; • describe the meaning of “adequate control”, particularly in relation to personal exposures; • discuss the importance of design considerations in terms of the workplace, process, and plant, as a means of reducing occupational exposures; • describe the principal elements of a local exhaust ventilation system, give examples of typical installations and know how to carry out the necessary measurements to assess whether a local exhaust ventilation system is effective and operating to the design specification; • recognise the limitations of local exhaust hoods and enclosures and the means to optimise their effectiveness; • describe how personal protective equipment programmes may be used in an effective manner; • recognise the impact that control measures may have on other workplace hazards and understand the need to take a holistic approach to the design of control solutions. 

The Module is run over 5 days with a practical assessment and a written examination on the final day, currently 40 short answer question “open book” examination with an allowed time of 120 minutes.


This Module includes the following topic areas:-

1 Hazardous Substances Uses and Processes 15% 
2 Workplace Control Principles 15% 
3 Process Design and Principles 15% 
4 Ventilation Systems and Performance Assessment 35% 
5 Personal Protective Equipment 15% 
6 Administrative Elements 5% 

The detailed content of the Module can be found in the W505 syllabus found on the approved training materials section of the OH Learning web site. 

Training info

Status: This event is approved by OHTA for the international qualifications scheme
Approved by OHTA
Category: Hazardous Substances
Level: Intermediate
Training provider: Diamond Environmental Ltd


Location Wigan, England
Starts 19 Oct 2020 09:00
Ends 23 Oct 2020 13:00
Course leader Mike Slater, M.Sc, DipOccHyg, FFOH
Places 10
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