Respiratory Protection

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Overview

Respiratory hazards harm slowly and invisibly; protection must match the hazard.

RPE is the last line of defence; ventilation comes first.

Respirator types & selection

Air-purifying respirators — disposable, half- or full-face with the right cartridge.
Cartridges matched to the hazard — P-filters, organic-vapour or acid-gas.
Powered air-purifying respirators (PAPR) for higher protection.
Supplied-air or SCBA for IDLH or oxygen below 19.5% O₂.
APR must NOT be used in oxygen deficiency or IDLH.

Step-by-step procedure

Identify the contaminant and assess concentration against the limit.
Apply the hierarchy — ventilation/LEV first, RPE for residual risk.
Confirm oxygen level — never use an APR below 19.5% O₂ or in IDLH.
Select the respirator type and cartridge to suit the hazard.
Fit test each wearer on a clean-shaven face seal.
Train wearers in donning, doffing, seal check and limitations.
Inspect before use and follow a defined cartridge change-out schedule.
Clean, dry and store respirators properly to keep them ready.

Key controls

Assigned protection factors confirm the RPE suits the exposure.
Mandatory fit testing and clean-shaven seal for tight-fitting respirators.
A change-out schedule based on contaminant and usage, not smell.

Roles & responsibilities

Role	Responsibility
HSE / Occupational Health	Assesses hazards, selects RPE, runs fit testing.
Supervisor	Ensures correct RPE is worn, inspected and changed out.
Wearer	Performs the seal check, keeps clean-shaven, reports faults.

Common mistakes to avoid

Using an APR in an oxygen-deficient or IDLH atmosphere.
Fitting a tight respirator over a beard, breaking the seal.
Fitting the wrong cartridge or running it past its change-out point.

Legal requirements (Thailand)

Occupational Safety, Health and Environment Act B.E. 2554 (2011) — the governing workplace-safety law in Thailand.
Personal protective equipment requirements issued by the Department of Labour Protection and Welfare under the Act.
Ministerial Regulation on OSH for work in confined spaces B.E. 2562 (2019).

Frequently asked questions

What is Respiratory Protection?

Respiratory hazards on site include welding fume, abrasive-blasting dust, solvent vapour, acid gases and oxygen-deficient atmospheres in confined spaces. Many cause harm slowly and invisibly, so a structured programme is essential to match the right protection to the actual hazard and concentration.

Who is responsible?

HSE / Occupational Health: Assesses hazards, selects RPE, runs fit testing and medical clearance.; Supervisor: Ensures correct RPE is worn, inspected and changed out on schedule.; Wearer: Performs the seal check, maintains a clean shave and reports faults.

What are the most common mistakes to avoid?

Using an air-purifying respirator in an oxygen-deficient or IDLH atmosphere. Fitting a tight-fitting respirator over a beard or stubble, breaking the seal. Fitting the wrong cartridge or running it well past its change-out point.

References — APF concepts and welding-fume control; Thai OSH Act B.E. 2554 and chemical/airborne regulations.