Pharmaceutical and chemical explosion proof lighting selection guide

The first part of explosion proof lighting: the concern of the pharmaceutical and chemical explosion proof electrical product compliance, without delay

Pharmaceutical companies, whether it is biopharmaceuticals, chemical synthesis or APIs, etc., in the production process and production processes often need to use a variety of flammable and explosive organic solvents, which belongs to the flammable and explosive substances, and therefore must take a series of explosion proof measures to ensure safe production.

In the explosion proof workshop design process, should be based on the division of explosive hazardous areas, types of equipment and explosion proof structural requirements, select the appropriate explosion proof type, in accordance with the relevant current norms, regulations and requirements of the specificity of the professional design and strict acceptance of the process to ensure that the technical safety.

Let’s take a look at a few cases:

Case I: At about 13:49 on May 3, 2018, a pharmaceutical and chemical company limited hydrogenation workshop No. 1 hydrogenation kettle withdrawal catalyst during the operation of the flash explosion in the kettle, the accident led to one death, the direct economic loss of 1,446,000 yuan.

Case 2: March 7, 2019 10:53, a pharmaceutical company Ltd. explosion, 8 people were injured and sent to the hospital, of which 1 person died of failure to rescue.

According to incomplete statistics, more than 28.3% of the explosion accidents occurring each year is caused by unqualified explosion proof electrical class reasons, it is evident that the choice of explosion proof equipment for pharmaceutical and chemical enterprises is crucial.

The second part of the pharmaceutical устойчивост на експлозия clean room устойчивост на експлозия lighting problem point analysis

Pharmaceutical explosion proof cleanroom clean explosion proof lamps and lanterns, in addition to meeting the explosion proof standards, should also meet the GMP requirements, and therefore need to pay attention to the following aspects:

1, static electricity

explosion proof lamps and lanterns lampshade is usually 2-3mm thickness of PC or toughened glass as a transparent part, impact resistance needs to be through the 1Kg steel ball height of a meter of free-fall impact test.

pc antistatic treatment there are currently two ways: 1) coated with antistatic liquid; 2) nano coating technology. Nano-coating technology. Antistatic liquid and nano-coating anti-static properties over time gradually weakened or even completely disappeared, in order to reduce the static electricity caused by safety accidents, explosion proof lamps and lanterns should be used in the choice of toughened glass.

2, air conditioning system

clean room pressure requirements, mainly through the air conditioning air supply and air intake system to complete the directional wind speed needs to be greater than 0.2m / s, the electron by the external forces out of the track, the different materials of the objects in contact and then separated, you can generate static electricity. explosion proof lamps and lanterns need to prevent the net electric charge buildup.

3, sealing

sealing is a clean explosion proof lamps and lanterns need to address the main points, both related to safety requirements and affect the cleanliness requirements. It should be noted that explosion proof lamps and lanterns sealing strip in the industrial complex environment is easy to aging, resulting in the loss of airtight lamps and lanterns.

4, hiding dust

clean explosion proof lighting needs to have easy to wipe, to avoid the emergence of difficult to clean parts of the conditions, the shell and the lampshade connection in addition to meet the explosion proof requirements, should also minimize the parts of the hidden dust to meet the clean requirements.  

5, bacteria breeding

explosion proof lamps and lanterns in the cavity of the large volume, the lamps and lanterns run in the process of generating heat, lamps and lanterns in the shell of the air is expanding, resulting in increased internal pressure. When the lamps and lanterns stop running, the air within the shell pre-cooling contraction, resulting in lower internal pressure, air particles will be sucked into the cavity of the lamps and lanterns, and deposition.

In addition, the structure of the dead ends or poor sealing will lead to bacteria in the lamps and lanterns in the cavity or the dead ends of the breeding, can not be cleaned and disinfected sterilization, it will become a risk point affecting the cleanliness of the workshop.

6, material

clean explosion proof lamps and lanterns material is crucial, in addition to the need to meet the safety requirements of the pharmaceutical explosion proof environment, should also meet the requirements of the pharmaceutical clean, and corrosion-resistant, oxidation-resistant, impact-resistant, anti-static properties.

7, positive pressure

pharmaceutical clean room must maintain a certain positive pressure (like aseptic filling room in the absolute pressure difference of 45pa or so), clean room air flow in accordance with the flow type flow, this state of the lamps and lanterns on the surface or within the shell of the deposition of particles and bacteria basically remain static.

8, pressure relief

lamps and lanterns can not be cleaned and disinfection sterilization, will precipitate a certain amount of particulate matter, bacteria will also breed, pressure balance of the state (bacteria and particulate matter) overflow less. 

when the door is opened, the balance of air pressure is broken (instantaneous pressure relief) by the impact of the pressure difference in the clean room air flow changes, and accelerate the speed of flow, easy to lamps and lanterns cavity in the body of the particulate matter and bacteria are released into the clean area, resulting in the workshop The number of dust particles increases, and at the same time there is a certain increment of planktonic bacteria and settled bacteria.

The third part of explosion proof lighting: the traditional lamp explosion proof clean lamps and lanterns problem points

1, the aging of the rubber strip

As a result of the need for disinfection and sterilization of pharmaceutical clean room, will be the long-term use of disinfection solvents, sealing rubber strip is easy to be corroded, hardening, fracture, deformation and other issues, poor sealing leads to dust entry, adsorption, and lamps and lanterns can not be cleaned internally, prone to breeding of bacteria.

2, generate static electricity

PC plastic transparent parts are usually coated with electrostatic liquid and nano-coating technology to do anti-static treatment, lamps and lanterns in the long-term running process, anti-static function will gradually fade. Lamps and lanterns run to generate heat, heat leads to dryness, dryness generates static electricity. Static electricity is generated by a variety of factors, the release of static electricity also has a variety of ways, such as air supply system can also release static electricity.

3, the inner cavity breeding bacteria

traditional clean lamps, due to the light source, itself in the design of certain limitations, the internal space, but the lamps and lanterns can not be sterilized inside.

4, dust adsorption

heat will be generated when the luminaire is running, the heat will cause the air to expand, when the luminaire is extinguished, the air cooling will be contracted, at this time, the particles in the air will be contracted with the air to enter the interior of the luminaire and adsorbed due to electrostatic deposition.

With the increasingly stringent requirements of safety and pharmaceutical GMP, the traditional explosion proof clean fluorescent lamps can not break through the design limitations, in a short period of time may not be eliminated, but from the point of view of the long-term development of the pharmaceutical workshop it is only a matter of time.

The fourth part of explosion proof lighting: the panel explosion proof clean lamps and lanterns problem points

1, LED light source temperature

nR class explosion proof lamp temperature test, LED light source temperature 100-115 ℃ + ambient temperature of 60 ℃ = 165 ℃ or so. Temperature group T3 for 135 ℃ to 200 ℃, T4 for 100 ℃ to 135 ℃, not to good heat dissipation of the shell as well as reduce the ambient temperature as a prerequisite for the temperature group can be raised from T3 to T4?

2, can be applied in the устойчивост на експлозия area

explosion proof lamp Ex d IIB T6 Gb grade, the lampshade part of why it is appropriate to use more than 10mm toughened glass, because it is necessary to resist the impact of a 1Kg steel ball 1 meter height free fall, while preventing the generation of static electricity for a long time. So the question is, PC in the explosion proof area can be a long time to prevent static electricity?

3, устойчивост на експлозия joints butt

common explosion proof joints are carbon steel, stainless steel, brass these kinds of. It is usually advisable to use brass, because brass has better flexibility and wear resistance. Panel-type explosion proof clean light with waterproof joints, then the question comes up, waterproof joints can be used as explosion proof joints?

4, shell protection

explosion proof lamps and lanterns require all charged components in the shell internal protection, explosion proof lamps and lanterns charged part must be completely isolated from the outside world, and the explosion proof joint surface can not be less than 12.5mm, explosion proof joint surface should be less than 0.15mm at the largest gap.

explosion proof lamp body and power supply part must be separated in the case of the two certificates must be one, and the intermediate connecting parts have strict requirements.

Part V explosion proof lighting: explosion proof explosion proof clean flat lamps and lanterns solutions

1, anti-static, impact resistance

(1) Tempered glass

impact transparent parts of the selection of transmittance of more than 93% of the 10mm thick ultra-white ultra-flat tempered glass, to prevent the generation of static electricity, to avoid safety accidents caused by static electricity. Through the 1kg steel ball 1 meter height free fall impact test to meet the performance requirements of impact resistance.

(2) Aluminum alloy frame

lamp shell is made of aluminum alloy, and the surface coating is processed by adding conductive powder to achieve permanent anti-static function. Aluminum alloy shell is not less than 4mm at the thinnest point, the explosion proof surface is not less than 12.5mm, to meet the requirements of shell protection and impact resistance.

2, sealing performance

(1) protection level IP68

clean explosion proof lamps and lanterns protection level upgraded to IP68, a complete solution to hide dust, dust accumulation, bacteria inside the cavity breeding and open the door to drain bacteria, dust leakage and other issues.

The power supply is built-in, which is in line with the regulatory requirement that the electronic components of explosion proof lamps and lanterns are completely isolated inside the shell. Meet the double standards of explosive gas environment and explosive dust environment, and at the same time meet the clean requirements of explosion proof lamps and lanterns in pharmaceutical and chemical workshops.

(2) Easy to wipe, no dead space

adopts epoxy resin pouring process to realize the bonding of tempered glass and frame, without the use of sealing tape to achieve the sealing requirements of the whole lamp; the appearance of the arc-type design, no dead space, easy to wipe, easy to clean.

(3) устойчивост на експлозия joints

explosion proof lamps and lanterns outlet devices need to meet the sealing requirements, explosion proof joints are made of brass, brass has strong wear resistance and flexibility, not easy to produce small metal particles due to friction, and can avoid joints and explosion proof tube connection cracking, reducing safety hazards.

3, trouble-free operation time

(1) power supply program

Built-in industrial-grade bipolar strobe-free drive power supply, the use of original electronic components, the conversion efficiency to more than 90%, reducing heat; the use of potting encapsulation technology, the electronic components are heated uniformly, heat dissipation, reducing the operating temperature.

(2) light source program

chip selection of bright lamp beads, first and then string program, copper foil thickness of 2 ounces to protect the smoothness of the current, improve the stability of the light source, light efficiency 120lm/W, compared with traditional explosion proof lamps and lanterns, energy saving 70%.

(3) heat dissipation design

chip and power supply through the 6 kg aluminum alloy frame and backplane overall heat dissipation, effective heat dissipation cross-sectional area of 0.288 ㎡, junction temperature of 45 ℃ or less, good heat dissipation effectively extends the service life of the electronic components to avoid failures due to internal heat to enhance the stability of the lamp.

(4) Maintenance-free life

Excellent electronic components matched with good heat dissipation design program to ensure trouble-free operation time of more than 50,000 hours.

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