Fluid intake table. Wind chill indices. Relative humidity. Humidity chart. Heat stress index

• Author: International Labour Organization
• Pages: 198-202

198 Meetings-MESHA-Final Code-2010-10-0355-1-En.doc/v2

Appendix VI 1

A. Fluid intake table

Work/rest

Water intake

(litres/hr)

Work/rest

Water intake

(litres/hr)

Work/rest

Water intake

(litres/hr)

1 25.6-27.7 NL 1/2 NL 3/4 40/20 min 0.3 (average)

2 (green) 27.8-29.4 NL 1/2 50/10 min 3/4 30/30 min 1

3 (yellow) 29.4-31.1 NL 3/4 40/20 min 3/4 30/30 min 1

4 (red) 31.1-32.2 NL 3/4 30/30 min 3/4 20/40 min 1

5 (black) >32.2 50/10 min 1 20/40 min 1 10/50 min 1

1. If wearing mission oriented protective posture 4, add 6 °C to WBGT

Light (easy) work

Mode rate work

Hard (heavy work)

WBGT

index °C

Heat

category

2. If wearing personal body armour, add 3 °C to WBGT in humid climates

3. Daily fluid intake should not exceed 12 litres

4. Caution: Hourly fluid intake should not exceed one litre

5. Rest means minimal physical activity (sitting or standing), accomplished in shade if possible

6. NL=no limit to work time per hour

7. These work/rest time and fluid replacement volumes sustain performance and hydration for at least four hours of work in the specified

work category. Individual water needs may vary ± 1/4 lt/hr

1 These tables are only of indicative nature.