1. Explosion-proof lighting explosion-proof categories, levels and temperature groups see national standards.
2. According to explosion-proof type, it can be divided into five main types: explosion-proof, increased safety, positive pressure, no spark and dust explosion proof. It can also be combined with other explosion-proof types and the above explosion-proof types. Special type.
3. According to the type of protection against electric shock can be divided into I, II, III category. The protection against electric shock is to prevent the explosion-proof lamp housing from being easily touched and the parts are electrified, so that the human body is exposed to electric shock or conductors with different potentials to generate electric sparks and ignite the explosive mixture.
AI class—On the basis of basic insulation, accessible conductive parts that are not energized during normal operation are connected to the protective ground conductor in the fixed line.
Class BII - Use double insulation or reinforced insulation as a safety measure without grounding protection.
Class CIII - Use a safe voltage with an effective value of not more than 50V, and no voltage above it will be generated.
Category D0 - only rely on basic insulation as a safety protection measure. Explosion-proof lighting fixtures should be regularly maintained and repaired in time during use.
1 Maintenance and repair personnel need to be trained on the job to understand the performance of the lamps and use requirements clearly. Maintenance personnel must have professional knowledge and be familiar with the structure of the lighting products.
2 Regularly eliminate dust and dirt on the explosion-proof lamp housing and improve the light efficiency and heat dissipation performance of the lamp. The cleaning method can be based on the protection capability of the lamp housing, using water spray (over the shade on the lamp) or using a damp cloth. When cleaning with water spray, the power should be cut off. Do not use a dry cloth to scrub the plastic housing (transparent parts) of the lamp to prevent static electricity.
3 Check whether the plastic casing (transparent parts) of the lamp has serious discoloration, such as severe discoloration, indicating that the plastic has aged. Check whether the transparent parts have been affected by foreign material, whether the protection network has loosened, soldered, and corroded. If so, use should be stopped and repaired and replaced in time.
4 The light source should be turned off in a timely manner to notify the replacement, so as to prevent the ballast and other electrical components from being in an abnormal state for a long time because the light source cannot be started.
5 If the accumulated water in the cavity of the lamp used in the humid environment should be cleared in time, replace the sealing parts to ensure the protective performance of the housing.
6 When you open the lamp cover, you should press the warning board to open the cover after turning off the power.
7 After opening the cover, check whether the flameproof joint surface is intact, whether the rubber seal is hardened or sticky, whether the wire insulation layer is green and carbonized, and whether the insulation and electrical components are deformed and burned. If these problems are found, they should be promptly repaired and replaced.
8 Maintenance The model, size, size, and performance of the replaced light source, components, and electrical components should be the same as those of the light source, components, and electrical components prior to service and replacement.
9 Apply wet cloth (not too wet) before closing the cover. Lightly tap the light and transparent parts of the lamp to increase the efficacy of the lamp. A layer of 204-1 displacement rust preventive oil should be applied thinly on the flameproof joint surface. When the lid is closed, attention should be paid to whether the sealing ring plays a sealing role in the original position.
10 The sealed part of the lamp should not be frequently disassembled and opened.
Precautions The portable lighting is divided into two types, the power supply from the feed grid and the self-power supply. For lamps powered by the feed-in network, rubber-sleeved cables shall be used between the explosion-proof junction boxes (boxes) or explosion-proof plugs and the lamps. The grounding or connection of the neutral conductor shall be within the same jacket; the cable shall adopt the minimum allowable cross section of the main conductor core. 25 mm2 YC, YCW heavy duty rubber cable. One point to be emphasized here: The cable for portable lighting does not allow intermediate connectors.
In the electrical explosion-proof safety management, there can be no luck mentality, and it must be done in strict accordance with relevant regulations and requirements in order to be foolproof.
Stainless Steel Sanitary ASTM A270 Stainless Steel Tubes is the main tubing line for a piping system. Generally, ASTM A270 Stainless Steel Tubes are made in stainless steel 304 and 316l, but we provide other grade too such as hastelloy C22, 316Ti, Titanium and nickel alloy etc. Kaysen offer both Sanitary Seamless Tubes and Sanitary Welded Tubes to ASTM A270, ASTM A249, A269, ASTM A554, DIN11850, and size is up to 12″. Inner and outer surface is polished to meet the high purity requirement of hygienic industries. Kaysen is ability to supplying qualified ASTM A270 Stainless Steel Tubes comply to your your condition and FDA,GMP requirement.
ASTM A270 Stainless Steel Tubes - Sanitary Tubing
Material: SS304, SS316L, EN 1.4301, EN 1.4404, etc
OD diameter: 1/2" - 12"
Thickness: 0.5mm - 6mm
Standard: ASTM, JIS, DIN, JIS, SUS, GB
Length: 6m or customer made
Tolerance: OD. ±0.2mm; Thickness: ±0.02mm; Length: ±0.5mm
Surface Treatment: Matt Finish or Mirror Finish (320# 400# 600#) etc
Application: Boiler, heat exchanger, construction, hygienic, pharmacy, power, petrochemical
Strength:
Heat Treatment of solution annealing for the sanitary tubings and fittings are available
High precision on dimension and wall thickness
Both seamless and welded sanitary tubings are available
Length is up to 12 meters.
Min. order quantity of sanitary tubings is from 300Kgs.
Offer industrial pipe and tubes according to order.
PMI test to verify material grade.
Visual and surface 100% examination before shipment.
End protected for shipment.
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