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GB 12367-2006: Safety code for painting -- Safety for electrostatic spray painting process
GB 12367-2006
GB
NATIONAL STANDARD OF THE
PEOPLE?€?S REPUBLIC OF CHINA
ICS 13.100
C 65
Replacing GB 12367-1990
Safety code for painting - Safety for electrostatic
spray painting process
ISSUED ON: JANUARY 23, 2006
IMPLEMENTED ON: SEPTEMBER 01, 2006
Issued by: General Administration of Quality Supervision, Inspection and
Quarantine of PRC;
Standardization Administration of PRC.
Table of Contents
Foreword ... 3??
1 Scope ... 6??
2 Normative references ... 6??
3 Terms and definitions ... 7??
4 Working area for electrostatic spray painting ... 8??
5 Ventilation and purification ... 11??
6 Automatic electrostatic painting equipment ... 12??
7 Manual electrostatic painting equipment ... 14??
8 Paint storage and transportation ... 15??
9 Operation and maintenance ... 15??
10 Training and assessment ... 19??
Appendix A (Informative) Commonly used electrostatic measuring instruments
... 20??
Safety code for painting - Safety for electrostatic
spray painting process
1 Scope
This standard specifies the safety requirements for electrostatic spray painting
process and equipment, paint storage and transportation, operation and
maintenance, etc.
This standard is applicable to the design, manufacture, use, supervision and
management of electrostatic spray painting process and equipment using
combustible or combustible paint. The electrostatic spraying process using
other flammable and explosive materials or water-based paint can be
implemented with reference to this standard.
2 Normative references
The provisions in following documents become the provisions of this Standard
through reference in this Standard. For the dated references, the subsequent
amendments (excluding corrections) or revisions do not apply to this Standard;
however, parties who reach an agreement based on this Standard are
encouraged to study if the latest versions of these documents are applicable.
For undated references, the latest edition of the referenced document applies.
GB 3836.15-2000 Electrical apparatus for explosive gas atmospheres - Part
15: Electrical installations in hazardous areas (other than mines) (eqv IEC
60079-14:1996)
GB 4385 Technical requirements for antistatic footwear and conductive
footwear (GB 4385-1995 neq ISO 8782-1: 1989)
GB 6514-1995 Safety code for painting - Safety, ventilation and air clean-up
for painting process
GB 7691-2003 Safety code for painting - Safety management general rule
GB 8978 Integrated wastewater discharge standard
GB 12158 General guideline for preventing electrostatic accidents
GB/T 14441-1993 Safety code for painting - Terminology
GB 50058 Electrical installations design code for explosive atmospheres and
fire hazard
GBJ 140 Code for design of extinguisher distribution in buildings
3 Terms and definitions
The terms specified in GB/T 14441-1993 as well as the following terms and
definitions apply to this standard.
3.1
Electrostatic spray painting
Under the action of a high-voltage electric field, the spray painting method
where the sprayed solvent-based paint drops are charged with a negative
charge by the principle of corona discharge, then further atomized, adsorbed
on the positively charged grounded substrate, finally discharged and
attached to the substrate.
3.2
Working area for electrostatic spray painting
Painted area where electrostatic spray painting is performed.
3.3
Electrostatic atomizing head
Pneumatic, electric, hydraulic, ultrasonic or other forms of equipment with
high-voltage electrostatic protection measures which, at the aid of centrifugal
force or compressed air and electrostatic repulsion, electrostatically charge
and fully atomize the paint, such as: electrostatic spray gun, spinning cup,
throwing plate, fog bin, etc.
3.4
Booth for electrostatic spray painting
A completely enclosed or semi-enclosed room or enclosure structure with
good mechanical ventilation and lighting equipment, specially used for
electrostatic spray painting. The indoor airflow organization can prevent
paint mist and solvent vapor from escaping outward and make it
concentrated and safely introduced into the exhaust system.
d) There shall be explosion-proof seal when the tow line is lead into the
junction box, accessory box or enclosure;
e) It shall comply with the national provisions on electrical equipment in
explosive hazardous areas.
4.5 Electrostatic painting equipment
Electrostatic painting equipment shall comply with the requirements specified
in 9.3 of GB 3836.15-2000 and GB 50058; it shall only be installed and used in
electrostatic painting areas when it meets the requirements of chapter 6 and
chapter 7 of this standard.
4.6 Fire protection
4.6.1 The fire protection requirements of the electrostatic spray painting area
shall be implemented in accordance with the provisions of clause 5.4 and
chapter 8 of GB 6514-1995.
4.6.2 The electrostatic spray booth shall be equipped with a combustible gas
concentration and fire alarm device (explosion-proof detector), which shall be
interlocked with automatic feeding stop, power cut off device, automatic fire
extinguishing device, etc.
4.6.3 Automatic fire control valves shall be installed in the ventilation ducts
which connect the electrostatic spray booth; the effective working conditions of
the valves shall be maintained.
4.6.4 The building where the electrostatic painting area is located shall be
equipped with fire extinguishing equipment according to the requirements
specified in GBJ 140.
4.6.5 Automatic electrostatic painting equipment using combustible or
combustible paint shall be protected by a flame detection device. When a fire
occurs, the flame detection device can react to the flame within 0.5 s and
complete the following tasks:
a) Turn on the local alarm near the electrostatic painting area and the alarm
system that may be installed on the electrostatic spray painting equipment;
b) Close the feeding system;
c) Terminate all spraying operations;
d) Stop all conveying equipment entering and leaving the electrostatic spray
painting area;
e) Cut off the power supply of the high voltage devices in the electrostatic
5.5 The wastewater produced in the electrostatic spray painting process shall
be purified and treated to meet the requirements of GB 8978.
6 Automatic electrostatic painting equipment
6.1 Approved equipment
The electrostatic atomizing head is an electrostatic painting equipment fixed by
mechanical clamping. Both the equipment and the equipment for eliminating
static electricity shall comply with the requirements of chapter 6 of GB 7691-
2003, meanwhile it shall have the in-factory acceptance certificate.
6.2 Electrical and control equipment
6.2.1 The electrostatic spray painting area allows the installation of high-voltage
grids, electrodes, electrostatic atomizing heads and connecting cables.
6.2.2 Transformers, high-voltage power supplies, control devices and other
electrical components (such as plugs, etc.) shall be installed outside the
electrostatic spray painting area.
6.2.3 Electrical equipment and ignition sources shall comply with the provisions
of 5.4 of GB 6514-1995.
6.3 High-voltage electrostatic generator
The requirements of the high-voltage electrostatic generator shall be
implemented in accordance with the provisions of 8.3 of GB 6514-1995.
6.4 Electrode and electrostatic atomizing head
6.4.1 Electrodes and electrostatic atomizing heads or the electrodes and
electrostatic atomizing heads on the robot shall be firmly installed on the base,
support or moving device, meanwhile it shall have reliable ground insulation, its
grounding resistance shall be greater than 1 x 1010 ??.
6.4.2 When the fixed element is a thin metal wire, the metal wire shall be
tightened at any time; it shall not use knotted, twisted or even hardened metal
wire.
6.5 High-voltage cable
6.5.1 High-voltage cables shall be protected by armored cables or pipes to
prevent mechanical damage or exposure to corrosive media.
6.5.2 High-voltage cables shall comply with the requirements of 8.4.5 in GB
6514-1995.
equipment in the electrostatic spray painting area and the conductive parts
outside the device shall be reliably grounded. This requirement also applies to
paint containers, washing metal containers, safety fences and other conductive
objects or equipment in electrostatic spray painting areas. An eye-catching
grounding mark shall be installed on the equipment.
6.10 Isolation
There shall be separate or combined safety protection facilities around the
electrostatic painting equipment, such as isolated chambers, fences and
barriers.
6.11 Insulator
All insulators shall be kept clean and dry.
7 Manual electrostatic painting equipment
7.1 Approved equipment
The electrostatic atomizing head is a hand-held or hand-controlled electrostatic
painting equipment. Hand-held or hand-controlled electrostatic painting
equipment and static elimination equipment shall comply with the requirements
of Chapter 6 of GB 7691-2003, meanwhile it shall have an in-factory acceptance
certificate.
7.2 High-voltage circuit
The high-voltage circuit shall be designed as a safety type. The electrostatically
charged exposed components of the spray gun shall only be energized through
the operating switch, meanwhile the operating switch shall also be interlocked
with the spray paint supply.
7.3 Electrical and control equipment
Except for the spray gun and its connection with the power supply, the
requirements of other electrical and control equipment shall meet the
requirements of 6.2.
7.4 Grounding
a) Metal wires shall be used to ground the handle of the spray gun. The
operator shall hold the grounding handle firmly in the normal operating
position, its contact resistance shall be less than 1 x 106 ??;
b) Persons who are not wearing conductive shoes shall not enter the area
being painted; it is strictly forbidden to touch people who are working;
procedures for electrostatic painting.
9.2 Personal protective measures to be taken by operators
a) Operators shall wear conductive shoes, which shall meet the requirements
of GB 4385; the dirt on the shoes shall be removed in time when wearing
them;
b) In case of manual electrostatic spray painting, the gloves worn must have
holes or do not wear gloves, so that the hands can directly touch the metal
part of the spray gun handle and ensure that the operator is grounded;
c) Operators shall wear anti-static clothing; they shall not wear underwear
made of materials that are prone to generate and accumulate static
charges such as silk and synthetic fibers;
d) Clothes, hats or similar shall be worn and removed in the electrostatic
painting area;
e) Operators shall not wear isolated metal objects.
9.3 Operation precautions for operators
a) When spraying paint, the spray gun shall not be pointed at people; hands
shall not be placed on the nozzle;
b) Check whether the paint leaks before painting. If there is paint leak, it shall
not carry out spraying;
c) If the operator feels an electric shock during the painting operation, the
painting operation shall be stopped immediately;
d) If it is necessary to suspend the operation during the painting operation,
the electrostatic power switch shall be turned off, the spray gun?€?s pressure
shall be relieved, the electrode shall not be grounded;
e) During the painting operation, insulating objects shall not be used to touch
the workpiece, electrode or electrostatic atomizing head.
9.4 Daily maintenance of electrostatic atomizing head
a) The enterprise shall specify the resistance of the electrostatic atomizing
head, the power supply resistance and the detection period of the
resistance of the electrostatic atomizing head?€?s resistance bar according
to the actual use;
b) Perform inspections as required, to confirm whether the resistance is
intact and the seals are leaking. If problems are found, they shall be dealt
a) The waste and slag generated when cleaning the electrostatic spray booth
and spray equipment shall be properly handled. Generally, it should
uniformly establish the treatment of waste and waste residues by region
and industry; waste and waste residues can be classified and incinerated;
b) Cotton yarn, rags, etc. stained with paint or solvents shall not be littered,
which shall be placed in a metal box (bucket) with a lid and "marked",
cleared on duty and handled properly;
c) Clearing and handling conditions shall be recorded.
9.10 Supplement of paint
9.10.1 Before adding paint to the paint container placed on the insulating
support, the following shall be done:
a) Turn off the high-voltage electrostatic generator;
b) Discharge with a discharge rod;
c) Ground the paint container.
After the above requirements are met, the paint in the grounded container can
be added to the grounded paint container.
9.10.2 When the paint container is in a grounded state, the paint container shall
be reliably grounded before refilling the paint.
9.11 Repair
Maintenance operations shall follow the following provisions:
a) Before maintenance, the electrostatic painting operation shall be stopped,
the mechanical ventilation device shall continue to operate, so that the
concentration of flammable and explosive gas is lower than the
concentration specified by the national explosion-proof standard, then the
combustibles can be evacuated from the scene;
b) When the maintenance operation involves open fire operation, the hot fire
safety system shall be implemented and the safety operation procedures
shall be followed;
c) The concentration of hazardous substances in the maintenance work site
shall meet the requirements of 5.2.1 in GB 6514-1995;
d) The electrostatic measuring instruments used in production and
maintenance can refer to Table A.1 in Appendix A. The Table shows the
commonly used electrostatic measuring instruments for dif...