MINISTRY OF
HEALTH
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SOCIALIST
REPUBLIC OF VIETNAM
Independence - Freedom - Happiness
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No. 26/2016/TT-BYT
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Hanoi, June 30,
2016
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CIRCULAR
ON NATIONAL TECHNICAL
REGULATION ON MICROCLIMATE- PERMISSIBLE VALUE OF MICROCLIMATE IN THE WORKPLACE
Pursuant to the Law No.84/2015/QH13 on
Occupational Safety and Hygiene dated June 25, 2015;
Pursuant to the Law No. 68/2006/QH13 on
Technical regulations and standards dated June 29, 2006;
Pursuant to the Government's Decree No.
127/2007/ND-CP dated August 01, 2007 detailing the implementation of a number
of articles of the Law on Technical regulations and standards;
Pursuant to .the Government's Decree No.
63/2012/ND-CP dated August 31, 2012 defining the functions, rights,
responsibilities and organizational structure of the Ministry of Health;
Upon request of the Director of Health
Environment Management Agency;
The Minister of Health hereby issues this
Circular providing the national technical regulation on microclimate-
permissible value of microclimate in the workplace.
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The national technical regulation (QCVN) 26/2016/BYT
on microclimate- permissible value of microclimate in the workplace is enclosed
herewith.
Article 2. Effect
This Circular enters into force from
December 01, 2016.
Article 3. Implementation
The Director of the Health Environment
Management Agency, Directors and Directors General of Departments and General
Departments affiliated to the Ministry of Health, Heads of affiliates to
Ministries, Directors of the Departments of Health of provinces and
direct-controlled municipalities and Heads of health authorities of regulatory
authorities shall be responsible for implementation of this Circular ./.
PP. MINISTER
DEPUTY MINISTER
Nguyen Thanh Long
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TECHNICAL
REGULATION ON MICROCLIMATE - PERMISSIBLE VALUE OF MICROCLIMATE IN THE WORKPLACE
Foreword
QCVN 26:2016/BYT is compiled by the
Compilation Board of the National Technical Regulation on Occupational Hygiene,
proposed by the Health Environment Management Agency and issued together with
Circular No.26/2016/TT-BYT dated June 30, 2016 by the Minister of Health.
TECHNICAL
REGULATION ON MICROCLIMATE - PERMISSIBLE VALUE OF MICROCLIMATE IN THE WORKPLACE
GENERAL PROVISIONS
1. Scope of application
This Regulation stipulates requirements for
temperature, humidity, air velocity and heat radiation intensity in the work
place.
2. Subject of application
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This Regulation shall not apply to the outdoor
workplace, construction sites, pits, means of transport and refrigerated
warehouses.
3. Interpretation
For the purpose of this Regulation, terms
herein shall be construed as follows:
3.1. Microclimate in the workplace is the
atmospheric conditions in the workplace, including the combined effects of
temperature, humidity, air velocity and surface temperature of utensils and instruments
surrounding workers.
3.2. Temperature is a parameter indicating
the heat of a physical individual, denoted 0C.
3.3. Humidity:
- Absolute humidity (Ha) is
the water content of air at certain time and a given temperature expressed in
gram per cubic meter.
- Maximum humidity (Hm) or saturated humidity is the saturated
water content of air at certain time and a given
temperature expressed in gram per cubic meter.
- Relative humidity (Hr) is the ratio of the absolute
humidity to maximum humidity, expressed in percentage.
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3.4. Air velocity is the speed of natural
and mechanical air movement in a confined space in the workplace, expressed in
m/s.
3.5. Radiant heat is the exchange of thermal
energy without the direct contact between particles.
3.6. Light work is a job which involves
standing, walking, and sitting and in which a worker is required to frequently use
his/her hands most of the time. Light work burns 120 - 150 kcal per hour.
3.7. Medium work is a job which involves
standing, walking, moving, processing components weighing less than 1 kg while
standing or sitting, and lifting or carrying objects of no more than 10 kg.
Medium work burns 151-250 kcal per hour.
3.8. Heavy work is a job and work activity
in which a worker is frequently required to carry out while standing or
walking, to process and to move objects weighing more than 10 kg. Heavy work
burns more than 250 kcal per hour.
3.9. Wet bulb globe temperature (WBGT) is an
experimental index of heat stress of an individual exposed.
WBGT index is determined based on two
derivative parameters, namely the natural wet-bulb temperature (tnw)
and black globe thermometer temperature (tg); in some cases, WBGT is determined
based on only dry-bulb temperature (ta).The WBGT index is calculated
using the following formula:
- Indoor and outdoor conditions with no solar load:
T°WBGT= 0.7 tnw + 0.3
tg
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T°WBGT = 0.7 tnw + 0.2
tg + 0.1 ta
II.TECHNICAL SPECIFICATIONS
1. Requirements for microclimatic conditions in the
workplace are classified by kind of work as presented in Table 1.
Table 1.
Permissible values of microclimate parameters in the workplace
Kind of work
Air temperature
(°C)
Humidity (%)
Air velocity
(m/s)
Heat radiation
intensity by area of exposure (W/m2)
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20 - 34
40 - 80
0.1 – 1.5
35, when more
than 50% of body surface area are exposed
70, when more
than 25% up to 50% of body surface area are exposed
100, when less
than 25% of body surface area are exposed
Medium work
18 - 32
40 - 80
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Heavy work
16 - 30
40 - 80
0.3 – 1.5
Where the workplace is hot and has high
humidity, the air velocity therein may increase to 2 m/s.
Where the workplace having air conditioners
and the ventilation is in good condition to ensure the permissible
concentration of CO2, the air velocity therein may be less than 0.1
m/s if workers perform light work, less than 0.2 m/s and less than 0.3 m/s if
workers perform medium and heavy work, respectively.
The difference in temperature by altitude
shall not exceed 3 0C.
The difference in temperature by horizontal
direction in the workplace where workers perform light, medium and heavy work
shall not exceed 4°C, 5°C and 6°C, respectively. The difference between outdoor temperature and indoor temperature
shall not exceed 5°C.
2. Requirements for microclimatic conditions in the
workplace by WBGT are presented in the table 2.
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Unit: (°C)
Heat exposure
duration
Kind of work
Light work
Medium work
Heavy work
Continuously
30.0
26.7
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75%
30.6
28.0
25.9
50%
31.4
29.4
27.9
25%
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31.4
30.0
III. MEASUREMENT
The methods for measurement of microclimate
in the workplace shall be determined as stipulated in the TCVN 5508 – 2009:
workplace air - Microclimate requirement and method for measurement.
IV. MANAGMENT
1. The workplace where workers contact with microclimate
elements shall be periodically inspected once every year in accordance with
regulations on the Labor Code and Law on Occupational Safety and Hygiene.
2. Employers shall provide their employees with sufficient
personal protective equipment which is suitable to use in the workplace under
the Law on Occupational Safety and Hygiene.
3. Where any microclimate parameter fails to meet
permissible standards, the employer shall take actions for improving the
working environment and protecting employees’ health.
V. IMPLEMENTATION
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2. The Health Environment Management Agency- Ministry of
Health shall take charge of cooperate with relevant functional authorities to
provide guidance and implement this Regulation.
3. The Health Environment Management Agency shall request
the Ministry of Health to make proper amendment and supplementation for the
purpose of management.
4. In case any of national and international microclimate
standards referred to this Regulation is revised, supplemented or replace, the
new on shall prevail.