|
THE
MINISTRY OF LABOUR, WAR INVALIDS AND SOCIAL AFFAIRS
-------
|
SOCIALIST REPUBLIC OF VIET NAM
Independence - Freedom - Happiness
---------------
|
|
No.
20/2011/TT-BLDTBXH
|
Hanoi, July 29, 2011
|
CIRCULAR
ON PROMULGATING THE “NATIONAL
TECHNICAL REGULATION ON OCCUPATIONAL SAFETY FOR ELECTRIC WELDING MACHINE &
ELECTRIC WELDING JOBS”
THE MINISTRY OF LABOUR, WAR INVALIDS AND SOCIAL
AFFAIRS
Pursuant to the Government's
Decree No. 186/2007/ND-CP of December 25, 2007 on defining the functions,
tasks, powers and organizational structure of the Ministry of Labour, War
Invalids and Social Affairs;
Pursuant to the Government's
Decree No. 127/2007/ND-CP of prescribing a number of articles of the Law on
Technical regulations and standards;
Pursuant to the Government's Decree
No. 132/2008/ND-CP of December 31, 2008 on detailing a number of articles of
the Law on Product and goods quality;
Pursuant to the Circular No.
23/2007/TT-BKHCN of September 28, 2007 promulgated by the Ministry of Science
and Technology, on guiding the establishment, appraisal and promulgation of
technical regulations ;
After obtaining the
appraising opinions from the Ministry of Science and Technology in the Official
Dispatch No. 346/BKHCN-TDC, the Ministry of Labour, War Invalids and Social
Affairs promulgates the National technical regulations on occupational safety for electric
welding machine and electric welding jobs as follows:
...
...
...
Bạn phải
đăng nhập hoặc
đăng ký Thành Viên
TVPL Pro để sử dụng được đầy đủ các tiện ích gia tăng liên quan đến nội dung TCVN.
Mọi chi tiết xin liên hệ:
ĐT: (028) 3930 3279 DĐ: 0906 22 99 66
Notation: QCVN 3: 2001/BLDTBXH.
Article 2.
This Circular takes effect after 45 days as from the date of signing.
Article 3.
Ministries, ministerial-level agencies, Governmental agencies, People’s
Committees of central-affiliated cities and provinces, relevant organizations
and individuals are responsible for the implementation.
FOR
THE MINISTER
DEPUTY MINISTER
Bui Hong Linh
...
...
...
Bạn phải
đăng nhập hoặc
đăng ký Thành Viên
TVPL Pro để sử dụng được đầy đủ các tiện ích gia tăng liên quan đến nội dung TCVN.
Mọi chi tiết xin liên hệ:
ĐT: (028) 3930 3279 DĐ: 0906 22 99 66
THE SOCIALIST REPUBLIC OF VIETNAM
QCVN 3: 2011/BLDTBXH
...
...
...
Bạn phải
đăng nhập hoặc
đăng ký Thành Viên
TVPL Pro để sử dụng được đầy đủ các tiện ích gia tăng liên quan đến nội dung TCVN.
Mọi chi tiết xin liên hệ:
ĐT: (028) 3930 3279 DĐ: 0906 22 99 66
NATIONAL TECHNICAL REGULATION ON OCCUPATIONAL SAFETY FOR
ELECTRIC WELDING MACHINE AND ELECTRIC WELDING JOBS
...
...
...
Bạn phải
đăng nhập hoặc
đăng ký Thành Viên
TVPL Pro để sử dụng được đầy đủ các tiện ích gia tăng liên quan đến nội dung TCVN.
Mọi chi tiết xin liên hệ:
ĐT: (028) 3930 3279 DĐ: 0906 22 99 66
HANOI – 2011
FOREWORD
...
...
...
Bạn phải
đăng nhập hoặc
đăng ký Thành Viên
TVPL Pro để sử dụng được đầy đủ các tiện ích gia tăng liên quan đến nội dung TCVN.
Mọi chi tiết xin liên hệ:
ĐT: (028) 3930 3279 DĐ: 0906 22 99 66
NATIONAL
TECHNICAL REGULATION
ON OCCUPATIONAL SAFETY
FOR ELECTRIC WELDING MACHINE AND ELECTRIC WELDING JOBS
1. General provisions
1.1.
Scope of regulation
This
technical regulation prescribes the general requirements on safety for electric
welding machines, electric welding and electric welding in special conditions
and for electric welding jobs; it is required to observe the other relevant
provisions apart from these.
1.2.
Subjects of application
This
Regulation is applicable to:
1.2.1.
Organizations and individuals manufacturing, exporting, importing, circulating
and using electric welding machines.
...
...
...
Bạn phải
đăng nhập hoặc
đăng ký Thành Viên
TVPL Pro để sử dụng được đầy đủ các tiện ích gia tăng liên quan đến nội dung TCVN.
Mọi chi tiết xin liên hệ:
ĐT: (028) 3930 3279 DĐ: 0906 22 99 66
2. Provisions on techniques
2.1.
General provisions
2.1.1.
Electric welding may be organized stationarily outdoors or in workshops, or
temporarily in constructions.
2.1.2. For the
selection of welding technology process, apart from ensuring the safety against
electric shock, it must anticipate the possibility of dangerous and hazardous
factors (mechanic injuries, toxic gases and dust, heat radiation, infrared
rays, noise, vibration…) and concurrently take labour hygiene and safety
measures to eliminate such possibility.
2.1.3. The
metal cover of welders must be safety-connected (ground connected or “air”
connected) under TCVN 7447 (IEC 60364). In case that TCVN is changed or
supplemented, it is required to apply the latest provisions.
2.1.4. When
carrying out electric welding at the places with risks of fire or explosion, it
is required to observe the safety regulation on prevention and fighting of fire
and explosion.
2.1.5. When
carrying out electric welding in chambers, tanks, boxes and reservoirs, it is
required to provide ventilation, appoint supervisors, take particular safety
measures and obtain permission and approval from responsible persons.
It is
forbidden to perform welding in cellars, chambers, tanks, and reservoirs under
pressure or containing inflammable or explosive substances.
2.2.
Requirements for technology process
...
...
...
Bạn phải
đăng nhập hoặc
đăng ký Thành Viên
TVPL Pro để sử dụng được đầy đủ các tiện ích gia tăng liên quan đến nội dung TCVN.
Mọi chi tiết xin liên hệ:
ĐT: (028) 3930 3279 DĐ: 0906 22 99 66
2.2.2. When
performing electric welding, it is necessary to use solders, welding wires,
solder stick coasting… that do not produce toxic substances, or the
concentration of toxic substances does not exceed the allowed limit.
2.2.3. It is
only allowed to supply electricity to arc welding from welding electricity
generators, welding transformers and welding rectifiers. It is forbidden to
directly supply electricity to arc welders from the dynamic, lighting and tram
electric network.
2.2.4. The
connection diagram of welding electricity sources being supplied to arc welding
must ensure that the voltage between the electrodes and the welded parts of no
load does not exceed the no load voltage of one of the welding power supply.
2.2.5. The
independent welding machines as well as welding machine clusters must be
protected with fuses or circuit-breakers in the supply. The welding machine
clusters, apart from the protection in the supply, must also be protected by
circuit-breakers on general wires of the welding circuit and fuses on each wire
that leads to the welding machine.
2.2.6. It is
allowed to use soft wires, metal bars with any cross section shape but must
ensure the required sectional-area, the welded plate or the welded structure
itself as the inverse wire that connects the welded part with the welding power
supply. It is forbidden to use pipes not being welded objects as inverse wires.
It is
forbidden to use air, ground connection networks, structures made of metal or
technological equipment not being welded objects as inverse wires.
Inverse
wires must be firmly connected to the electrodes of the power supply.
2.2.7. When
moving welding machines, it is necessary to cut off their power supply. It is
forbidden to repair welding machines when the power is on active.
2.2.8. When
the electric welding is stopped, it is required to disconnect the welding
machine from the electric network. When the electric welding is done, apart
from disconnecting the welding machine from the electric network, the wire
connected with the welding clip must also be disconnected from the power supply
and put into the rack made of heat-insulated material.
...
...
...
Bạn phải
đăng nhập hoặc
đăng ký Thành Viên
TVPL Pro để sử dụng được đầy đủ các tiện ích gia tăng liên quan đến nội dung TCVN.
Mọi chi tiết xin liên hệ:
ĐT: (028) 3930 3279 DĐ: 0906 22 99 66
2.2.9. When
performing arc welding by hand, it is required to use the welding clips made of
electric-insulated and heat-resistant material with wire holders ensuring that
the wire would not come off.
Must not use
welding clips with under-passing wires for the welding current over 600A. In
this case, the welding machines must be equipped with no load current
suppressors.
2.2.10. On
the control mechanism of the welder must contain notes, numbers or notations
specify its functions. All the control mechanisms of a welder must be carefully
located and covered to avoid accidental connection and disconnection.
2.2.11. In
the electric panel or the contact welding machine clusters equipped with
exposed conductive parts of primary voltage network, it is required to install
the interlocking system to ensure the electric disconnection when opening the
panel doors. In case the interlocking system is not available, the electric
panel can be locked with usual locks, but the welding current adjustment must
be performed by electricians.
2.2.12.
Contact welders with metal melting process must be equipped with the shield
that blocks molten metal stream and ensure the safe observation of the welding
process.
2.2.13. The workshops where regularly assemble and
weld large metal structures need to be equipped with assembling and lifting
racks.
2.2.14. When
performing welding that produces dust and gases, as well as welding in
chambers, tanks and reservoirs, or welding large parts from the outside, it is
necessary to use mobile partial sucking spout and firmly, rapid assembling
devices to ensure supplying fresh air and removing toxic gases from the working
area of welders.
2.2.15. When
welding inside the cellars, tanks, chambers and reservoirs, the welding machine
must be put outside and supervised by the qualified person in safety
techniques. The welder must wear insulated shoes and gloves or lifeline and the
lifeline must be connected to the supervisor’s place. It is required to conduct
the ventilation at speed of 0.3 – 1.5 m/s. It is required to ensure that the
cellar, tanks, chambers and reservoirs are free from toxic or inflammable gases
before sending welders in.
When welding
using AC in particularly dangerous work conditions (in metal containers, in
chambers with high risk of dangers), it is required to use no load current
suppressors in order to ensure the workers’ safety when replacing solder
sticks. If such equipment is not available, other safety measures must be
taken.
...
...
...
Bạn phải
đăng nhập hoặc
đăng ký Thành Viên
TVPL Pro để sử dụng được đầy đủ các tiện ích gia tăng liên quan đến nội dung TCVN.
Mọi chi tiết xin liên hệ:
ĐT: (028) 3930 3279 DĐ: 0906 22 99 66
2.2.17. The
electric welding must not be carried out at welding positions without fire
prevention measures.
2.2.18. When
welding from a height, the platform must be made of non-flammable (or
hardly-flammable) material. The welders must wear lifelines, toolbags and spare
solder sticks.
2.2.19. It
is required to take safety measures when welding from different heights and not
letting heated metal drops, spare solder sticks and other material fall to
people working below.
2.2.20. When
performing welding outdoors, above the welding machine and the welding position
must be equipped with hoods made of non-flammable material.
If the hood
is not available, the work must be stopped when raining.
2.2.21. The
submerged welding must comply with the following requirements:
2.2.21.1. Only
welders who are granted the diver certificates and grasp thoroughly the work
characteristics may perform.
2.2.21.2. It
must have the working plan approved by competent persons.
2.2.21.3. It
must be supervised by persons who grasp thoroughly the work from above and may
keep in touch with the submerged welder.
...
...
...
Bạn phải
đăng nhập hoặc
đăng ký Thành Viên
TVPL Pro để sử dụng được đầy đủ các tiện ích gia tăng liên quan đến nội dung TCVN.
Mọi chi tiết xin liên hệ:
ĐT: (028) 3930 3279 DĐ: 0906 22 99 66
2.2.21.5.
The welder must not work underwater if there is oil slick on the water surface.
2.3.
Requirements for section of production, arranging equipment and organizing the
workplace
2.3.1. In
production sections where the opened arc welding is performed, it is required
to put partitions made of non-flammable material.
2.3.2. In
places where the electric welding that produces toxic substances (toxic gases
and hazardous radiation…) is performed, it is required to equip such places
with appropriate safety facilities, provide supplying and sucking ventilation.
2.3.3. The
walls and equipment in the welding workshop must be painted grey, yellow or
blue in order to absorb light and decrease the reflection of arc. It is
recommended to use paints able to absorb ultraviolet rays.
2.3.4. In welding workshops, the welded parts and
assembling welded parts must satisfy the conditions for microclimate under the
current provisions. The sections of the assembling welding workshop must have
supplying and sucking ventilation.
It is
required to provide partial ventilation when welding in chambers. The sucked
air must be emitted outside the supplied air area.
2.3.5. It is
required to identify the concentration of toxic substances in the breathing and
working area of welders under the current provisions.
2.3.6. The
quantitative inspection of X-ray in weld inspection must comply with the current
provisions on labour hygiene and safety.
...
...
...
Bạn phải
đăng nhập hoặc
đăng ký Thành Viên
TVPL Pro để sử dụng được đầy đủ các tiện ích gia tăng liên quan đến nội dung TCVN.
Mọi chi tiết xin liên hệ:
ĐT: (028) 3930 3279 DĐ: 0906 22 99 66
The lighting
when welding in tanks, chambers and reservoirs may be set up using portable
lights fed by safe power supplies of which the voltage does not exceed 36V for
AC and 48V for DC with protective screen attached, or using direction lights
illuminating from outside. The transformers used for portable lights must be
put outside the working place. The secondary coil of the transformer must be
safety-connected. It is forbidden to use auto-connected transformers to feed
portable lights.
2.3.8. It is
forbidden to use or preserve fuel, inflammable and explosive material in places
where electric welding is performed.
2.3.9. The distance between the welding machines
must not be closer than 1.5 meters. The distance between automatic welding
machines must not be closer than 2 meters.
2.3.10. When
arranging argon arc welding machines and performing welding in carbon dioxide
environment, the possibility of gas permeability and leakage to adjacent
chambers must be eliminated.
2.3.11. The
wire length from primary power supply to the portable welding equipment must
not longer than 10 meters.
2.3.12.
Regular arc welding of small and medium products must be performed in welding
chambers. The chamber wall must be made of inflammable material, the minimum
gap between the wall and the floor is 50mm. When welding in environment with
protective gases, this gap must be at least 300mm. The area for each welding
position in the chamber must not be lower than 3 m2. The welding
positions must be separated by inflammable partitions.
2.3.13. The
electric welding area must be isolated from other area. For some technology
process requirements, it shall be allowed locating welding positions alongside
other areas, the positions must be separated by inflammable partitions.
2.4.
Requirements for material, blanks, preservation and transportation.
2.4.1. The
blank surface must be dried and cleaned off paint, rust, oil and dust. The
edges of blanks and parts before welding must be ground.
...
...
...
Bạn phải
đăng nhập hoặc
đăng ký Thành Viên
TVPL Pro để sử dụng được đầy đủ các tiện ích gia tăng liên quan đến nội dung TCVN.
Mọi chi tiết xin liên hệ:
ĐT: (028) 3930 3279 DĐ: 0906 22 99 66
2.4.3. The
preservation, transportation and loading of welding blanks, welding material
and finished products must not affect the equipment safety operation or block
natural lighting, ventilation, pathways, or obstruct the use of fire and
explosion prevention equipment and personal safety equipment.
3. Provisions on occupational safety management in
manufacturing, importing, exporting, circulating and using electric welding
machines.
3.1. Provisions
on ensuring welding machine safety in manufacturing and importing before
selling.
Welder
manufacturers must fulfill the requirements for quality control as follows:
3.1.1.
Applying the management system in order to ensure that the manufactured and
imported welding machine quality is consistent with the applied regulation.
3.1.2. Publication
of the applied regulation
Manufacturers,
importers shall self-announce the basic features, warning information, standard
codes on the welding machine or one of the following media:
3.1.2.1. The
welding machine package;
3.1.2.2. The
welding machine label;
...
...
...
Bạn phải
đăng nhập hoặc
đăng ký Thành Viên
TVPL Pro để sử dụng được đầy đủ các tiện ích gia tăng liên quan đến nội dung TCVN.
Mọi chi tiết xin liên hệ:
ĐT: (028) 3930 3279 DĐ: 0906 22 99 66
3.2.
Provisions on ensuring safety for exported welding machine
3.2.1. The
welding machine exporter must ensure that the exported welding machines are in
accordance with the importing countries’ provisions, international treaties,
contracts or international agreement on mutual recognition for the
compatibility assessment results with the relevant countries or territories.
3.2.2. Self-building
and applying the management systems in order to ensure the quality of the
manufactured welding machines.
3.3.
Provisions on ensuring safety for welding machines circulated on the market
3.3.1.
Observing the corresponding technical standards during the welding machine
circulation.
3.3.2. Self-applying measures for quality control
in order to sustain the sold welding machine quality.
3.4.
Provisions on ensuring safety for welding machines in use
3.4.1. The
welding machine must be used, transported, stored and maintained under the
manufacturers’ instructions.
3.4.2.
Requirements for electric welding workers.
...
...
...
Bạn phải
đăng nhập hoặc
đăng ký Thành Viên
TVPL Pro để sử dụng được đầy đủ các tiện ích gia tăng liên quan đến nội dung TCVN.
Mọi chi tiết xin liên hệ:
ĐT: (028) 3930 3279 DĐ: 0906 22 99 66
The periodic
training on occupational safety for electric welders must be provided at least
once a year.
3.4.2.2.
Female workers are forbidden from electric welding in cellars, tanks, chambers
and reservoirs.
3.4.3.
Requirements for personal safety equipment.
3.4.3.1.
Electric welders must be equipped with personal safety equipment, welding
glasses, apron, boots, gloves and other safety equipment as prescribed.
3.4.3.2. The
personal safety equipment used for welders must ensure the resistance to spark,
physical impact, hot metal dust and hazardous radiations.
3.4.3.3.
When performing welding in environments with chemicals (acid, alkali, grease…),
electromagnetic field as well as welding preliminarily heated parts, welding workers
must be equipped with protective clothing made of material that can resist such
impacts.
3.4.3.4.
When performing welding in environments with high risk of electric accidents
(welding in closed reservoirs, cellars, tanks, chambers, damp places), apart
from protective clothing, welders must also be equipped with insulated shoes
and gloves. The welding position must be provided with insulated platforms or
carpets.
3.4.3.5.
Welder’s gloves must be made of hardly-flammable material and resistant to mechanical
impacts.
3.4.3.6.
Welder’s shoes must be made of hardly-flammable material and resistant to mechanical
impacts.
...
...
...
Bạn phải
đăng nhập hoặc
đăng ký Thành Viên
TVPL Pro để sử dụng được đầy đủ các tiện ích gia tăng liên quan đến nội dung TCVN.
Mọi chi tiết xin liên hệ:
ĐT: (028) 3930 3279 DĐ: 0906 22 99 66
3.4.3.8.
When performing welding in environments that produce toxic gases without
partial sucking devices, welders must be equipped with appropriate
respiratory-protective equipment.
4. Inspecting, examining and handling violations.
4.1. The
inspection and handling of violations of the provisions in this Regulation
shall be carried out by State inspectors of labour.
4.2. The
inspection of the quality of the manufacture, import, export, circulation and
use of electric welding machines must comply with the Law on Product and goods
quality and National technical regulations on occupational safety for electric
welding machines and electric welding jobs.
5. Responsibilities of organizations and individuals
5.1.
Organizations and individuals manufacturing, exporting, importing, circulating
and using electric welding machines are responsible for observing the
provisions in this Regulation.
5.2. This
Regulation is a basis for inspecting agencies of welding machines quality to
carry out inspection, and also a basis for organizations giving compatibility
assessment to certify the regulation conformity.
6. Organizing the implementation
6.1. The
Department of Occupational Safety and Health, the Ministry of Labour, War
Invalids and Social Affairs are responsible for guiding and inspecting the
implementation of this Regulation.
...
...
...
Bạn phải
đăng nhập hoặc
đăng ký Thành Viên
TVPL Pro để sử dụng được đầy đủ các tiện ích gia tăng liên quan đến nội dung TCVN.
Mọi chi tiết xin liên hệ:
ĐT: (028) 3930 3279 DĐ: 0906 22 99 66
6.3.This
Regulation takes effect after 6 months as from the date of signing.
6.4. During
the course of implementation, the relevant agencies, organizations and
individuals are responsible for making prompt feedbacks on the difficulties to
the Ministry of Labour, War Invalids and Social Affairs for study and
settlement./.