【 Weak current College 】 flammable, combustible liquid anti-static safety requirements (2009)---Power By 【 China power house network 】

The first article of flammable, combustible liquid anti-static refers to flammable and combustible liquids handling, conveying, blending, sampling, detection, temperature and equipment cleaning process, prevent electrostatic and flammable and combustible liquids in storage tanks, railway tanks (tank) car, car tanks (tank) car, Hok, pipeline, the human body, and so have the Elimination of static electricity. 　　Does not include lightning, stray current protection and solid, gas, dust, static-free. 　　The second elimination following static ignition conditions 1. formation of electrostatic charge; 2. it is sufficient to produce ignition of discharge of the accumulation of static charge; 3. suitable spark gap, the accumulation of electric charges to ignite the spark discharge form; 4. spark-gap are combustible liquids in vapour-air mixture. 　　Article 3, according to the GB 50160 the petrochemical enterprise design fire protection standard for liquefied hydrocarbon, flammable liquid fire hazard classification set out in table 1. 　　Table 1 liquefied hydrocarbon, flammable liquid fire risk analysis category name characteristics of A liquid hydrocarbon 15 ° c in the vapour pressure of > 0.1MPa hydrocarbon liquids and other similar liquids B combustible liquids in a class, flash point <28℃乙A28℃≤闪点≤45℃B45℃<闪点<60℃丙A60℃≤闪点≤120℃B闪点> 120 ℃, CPI flammable and combustible liquids into the tank and tank cars, the resistivity is equal to or less than 108 Ω · m are not affected by these provisions. IV a, type b flammable and combustible liquids into the tank and tank cars, the initial stream speed should not be greater than 1m/s. 　　When the inlet tube immersed 200mm can gradually increase the maximum velocity, but should not be should less than 6 m/s. 1. a, b flammable and combustible liquids containing free water, organic impurities as well as two more oil mixed with the initial stream when feeding speed should not exceed 1m/s; 2. a, b flammable and combustible liquids after adding antistatic agent, or a specialized static elimination and electrostatic alarm with, velocity for 6m/s; 3. when the liquids pipeline is equipped with a filter on a, type b flammable and combustible liquids transportation, from filters to charging should be between the 30s of the relaxation time. 　　If not for relaxation time, configurable relaxation or to take other antistatic measures (see table 2); table 2 VITTA and with ease (tube) CRT VITTA ease (tube) size/mm flow/(m3/h) speed m/s size/mm velocity (m/s) length/m100802.832000.7141001605.662500.9151002007.082501.3151002508.853000.9861501602.522500.9151503004.723500.8771504006.294500.709 article v-reservoir (cans), slot (car) into the flammable and combustible liquids, should be: 1. strictly forbidden from tank top injection of, CPI flammable and combustible liquids; 2. tank liquids should be thoroughly dried before feeding; 3. the prohibition on charging too high volatile products such as gasoline and oil tank switch into low volatile oil; 4. a change in storage tanks, oil injected should be inert gas replacement, hip measurement of hydrocarbon concentration in the air and bring it into conformity with safety requirements; 5. difficult to inert gas replacement barrel, tank, container, should strictly control the velocity and electrostatic grounding. 　　6 oil blending 1. strictly forbidden to use compressed air to a, b flammable, may fuel products blending; 2. CPI oil blending, which has a single components belong to the a, b oil, also no compressed air for blending; 3. c A class oil blending with compressed air, control of air pressure is not greater than 0.343MPa, oil blending temperature should be below the flashpoint of the oil 20 ℃. 　　7 a, type b flammable and combustible liquids in checked feet, temperature measurement, sampling provisions: 1. the liquid into the tank, with a certain standing time (see table 3), allowed to carry out the check feet, temperature measurement, sampling and other jobs, but floating-roof tank floating tanks (spare) has been in contact with oil or have checked feet well tank, unaffected standing time; table 3 tanks of liquid required minimum static schedule conductivity (S/m) storage device volume/m3 <1010~5050~500500~1000静置时间/min> 10-6111210-12-10-10-14 ~ 623103010-124560120 < 10-141015120240 2. prohibited the use of two different materials (conductive properties of different materials such as metal furniture and nylon rope) of feet, temperature measurement and sampling tools for the job; 3. any use made of the metal material temperature measurement box and sampler, you should use conductive material of ropes, and tanks for reliable grounding; 4. a fixed roof tank or floating roof tanks before without float liquid temperature measurement and test sample, it should not be quick to hitch, lift speed is not greater than 0.5m/s, falling speed is not greater than 1m/s; 5. railway tanks (tank)-car and car tanks (tank) car check size and temperature measurement, should be finished in the mount and after long standing 2min; 6. tank in oil, accumulating large amounts of electrostatic charge, should be gradually introduced to automatically check feet, temperature measurement and sampling equipment; 7. staff in check feet, temperature measurement and sampling should be eliminated before the body static electricity. 　　8 railway tanks (tank) car loading and unloading requirements 1. liquid-loading crane tube should be gradually adopts sealed loading facilities under liquid; 2. the railway tanks (tank) car immersion filling speed should meet the following type: VD ≤ 0.8-V — oil flow velocity, m/s; D-pipeline diameter, m. 　　3. Hok should be plugged into the tank (slot) at the bottom of the tank car (Groove) vehicle no more than 200 mm. 9 car tanks (tank) loading and unloading requirements: 1. the vehicle tank (Groove) car for loading and unloading operationsThe former, it should be reliable grounding trainsets; 2. the loading and unloading operations are completed, should be provided in table 3 aside time to elevate Hok, demolition Earth wire, etc.; 3. tanker immersed filling speed should meet the following type: VD ≤ 0.5-V — oil flow velocity, m/s; D-pipeline diameter, m. 　　10 small containers contain flammable liquids provisions 1. no use of insulating material barrel in job site contain flammable liquid; 2. it is prohibited to use insulators hanging containers contain flammable liquids; 3. flammable liquid metal barrel costumes, barrel, funnel and injection pipe mouth should be ground; 4. barrel filling oil, use conductive plastic tube (material resistance value is less than 104 Ω). 　　Article 11: to prevent electric shock body static electricity generation or discharge ignition of combustible substances caused, explosion accidents, job before elimination of the human body static electricity. Article 12 for the human body with electrostatic safety venting into the Earth, in the explosion danger area 0 class should create a new device specifications for design, construction, acceptance of appropriate safety measures to remove static electricity. 　　Should be made of conductive of the ground floor, the resistivity in 106 Ω · m or so. 　　Tank ladder entrance should have a grounded metal railings on leaving 0.5 ~ 1m long bare metal surfaces, as handheld grounding. 　　Article 13, to prevent harm to human body charged clothing should note: 1. in the explosion hazardous areas should not wear easily generate static clothing and footwear; 2. explosion hazardous areas should not dressing, footwear, comb; 3. in addition to the rain and the water place job may wear rubber coat and High Commission shoes, should not be in explosion hazardous areas wear; 4. artificial tank cleaning tanks and brush, you should wear anti-static overalls and anti-static raincoat, conductive rubber boots. 　　Article 14-clean up of flammable, combustible liquid equipment, apparatus of the "six allowed": 1. don't use gasoline, benzene and other flammable solvents for equipment cleaning apparatus and ground; 2. the use of liquid jet wash container, the pressure must not greater than 0.98MPa; 3. no compressed air is nail, CPI flammable and combustible liquids pipeline cleaning; 4. the application of the sampling products like oil on Sampler for cleaning, cleaning of used and remaining samples will not be allowed to fall back into the tank; 5. flammable, explosive places are not allowed to use chemical fiber materials production of MOP, cloth to wipe the surface object and dragging; 6. denied in one container at the same time adopt the manual and mechanical cleaning of two methods. Article 15 the anti-static grounding is the most basic measures, mainly in the equipment or pipeline metal conductors and Earth make electrical connections on the metal conductor electrostatic discharge in on Earth, and Earth close with potential. 　　Should be: 1. in the "grounding connection" between the conductors, the contact should be solid and reliable, ensure the integrity of the electrical pathway; 2. If the ground connection system is breaking point, engaged in restorative work, you should make sure that the fault point surroundings is not inflammable, explosive substances; 3. a connection to the grounding system of the maintenance work should focus on check in, Slipknot, the timely replacement of the gaskets corrode; 4. electrostatic grounding system of the resistance value should be consistent with the provisions of this regulation; 5. each year the fixed equipment grounding resistance to carry out a measurement and measurement data files, if the measured resistance value does not conform to the device, immediate repair; 6. might generate static, mobile devices (tool) Earth wire Assembly and disassembly work should be done (1) the operation or move before grounding installation; (2) after the end of the operation, should be set aside time before removing the grounding line; (3) disassembly grounding contact away from flammable, explosive hazard, and should not be under the direction of loading and unloading operations. 　　7. in the case of equipment, pipelines and other local maintenance, will cause the object static connection circuit breaker, prior to the grounding, maintenance after the ad should be timely recovery, and then restart the determination of the resistance value. 　　Article 16 the following places or situations should be static grounding: 1. where an explosion, fire danger place may generate electrostatic dangerous equipment and piping, shall adopt the measures electrostatic grounding; 2. the production unit with static electricity risks to production or make the human body when subjected to static electric shocks. 　　Article 17, the following situations do not need another do separate static grounding: 1. when the metal conductor has worked with the lightning protection, electrical protection earthing system reliably with attached, you can not do separate static grounding; 2. when the metal conductors have a close connection in any case, metal contacts have enough electrostatic conductivity, not another do static leap. Article 18 the total electrostatic grounding connection system leakage resistance value should be no larger than 106 Ω, grounding of the grounding resistance value should be no greater than 100 Ω. 　　Electrostatic grounding connection system of metal (including live metal body itself) and other uses of the grounding network sharing, grounding resistance values can be used by other applications to determine grounding requirements. 　　Article 19 the following grounding connections shall be: 1. earthing connection branch, trunk and grounding, etc., should be used for the connection bolt is firm law; 2. in the equipment or pipeline of metal body of a certain location is equipped with dedicated grounding connection end-plate, in the "end-plate" and grounding line, plus a flexible cross-cable connections with bolts fastening method; 3. for mobile devices and tools you can apply cell Chuck, crocodile-clamp, private connections Chuck, disc bolts and other connected devices and grounding connected branch, trunk; 4. equipment, pipe with metal flange connections, the contact resistance is not greater than 10 Ω, you can view the contacts between enough static electricity conducting, in General, not another install cross-wiring; 5. earthing object is not a metal body, should be installed on the ground in close connection with metal body for grounding, this kind of "indirect receipt is located in the" should avoid mechanical vibration, friction and tension and compression, and other damage. Article 20 on electrostatic equipment, pipeline grounding connection point location by selecting 1. outside harm; 2. to facilitate inspection and maintenance; 3. facilitate and connected to the grounding line; 4. without prejudice to the operation; 5. the formation and accumulation of risk to the mixture. 　　On the settings for grounding purposes ground connection end-plate requirements: 1. the device shell (including device support, lug) bare and reserved out of metal surfaces; 2. equipment, pipes, metal bolts to connect parts of the body; 3. welded to the equipment and pipeline shell or bearing ground end-plate (or bolts) material should be the same as the base metal welding, end plate section should not be less than 40mm×3mm, such as equipment insulation, the insulation of end-plate should be stretched out 60mm. 　　Article 21, on the ground and grounding of specific requirements: 1. appliance of electric protection grounded mains, as electrostatic grounding of trunk use, equipment and pipeline of electrostatic grounding line should not use electrical equipment designed for the zero line; 2. when there is no electrical protective grounding link can use, should be designed and installed electrostatic grounding route and ground body; 3. electrostatic grounding link device is shaped layout, different elevation of grounding link should have two connected in each unit area (including the loading and unloading stack) relative to the appropriate location on the side, at least for a group of independent grounding, and connected with the main line; 4. electrostatic grounding line may receive other uses of the floor, but should not be a type of lightning protection the grounding prong from a share, its spacing should be consistent with the lightning protection specification; 5. the isolation of equipment and outdoor pipe bonding, according to the need to set the grounding; 6. earthing and grounding material according to table 4 choices: table 4 grounded mains and grounding material table name ground/mm underground/mm indoor outdoor flat bars 25 × 440 × 440 × φ φ 8 4 round bars 10 13 angle φ 50 × 50 × 5 pipes Dg50 7. lightning drainage line does not apply to static grounding. Article 22 on the grounding line and cross-connection of selection 1. " Grounding line "and" cross-connection "should use sufficient mechanical strength, and is resistant to corrosion of the metal conductor; 2. fixed equipment grounding extension optional section is not less than φ 6 mm round bar, section of not less than 12mm×4mm steel flat or section of not less than 4mm2 strand wire, a large selection of mobile devices section of not less than 10m m2 copper-core rubber sheathed soft wire or copper cable. 　　General section mobile device selects m2 more than 4m strand wire for earth connection; 3. vibration and frequent mobile device, you should choose the section of not less than 4 mm2 for flexible copper-core wire for earth connection. 　　Article 23 of the tank and other fixed equipment grounding, consider the following: 1. If the tank and other fixed equipment, metal shell for lightning protection and grounding, this device may not otherwise static grounding connections; 2. tank and other isolated device metal body with bolted to the concrete foundation, or partially buried in the ground, when its grounding resistance less than 100 Ω, no longer as anti-static as grounding; 3. in the device area, static grounding link, should be dedicated grounding or other use of the Earth wire from the ground up (except for a class of mine facilities); 4. tank equipment in principle require multiple site on repeat ground, ground end-plate location should not be installed in the vicinity of import and export of materials; 5. the storage of flammable liquids floating metal tank top, application of flexible cross-wiring and touches, the tank should not be less than two, cross-wiring shall choose the section of not less than 25 mm2 in soft copper wire; 6. where the use of weighing meter of tank, the tank and stretch into the tank of the rope are applied metal conduit, and installation firm, tank Bell should be earthed connection; 7. tank sampling wells and tanks with crossover, sampling worktop with grounding end-plate, so that the sampler conducting ropes, check ' tool grounding, grounding end-plate position operation of wind direction on the operations of a Department on each side, so that the action before the wind decides to add location; 8. light fuel oil storage tanks, and other wall paint anti-static paint required, paint resistivity should be less than 108 Ω · m. 　　Article 24 on combustible media distribution system grounding requirements: 1. installation of the pipeline in the region through and process equipment for metal shell grounding, grounding conditions; 2. the distribution of pumps, filters, easing, etc should set the grounding connection points; 3. network access device or outdoor direct pipeline around every 100m, should be grounded mains or supposes is connected to the grounding; 4. parallel metal pipe to use pipe rack welding connections end-plate, electrostatic Flex crossover, can make use of the fixed bearing for crossover grounding; 5. the type of steel pipe frame may do is the grounding conductor connection system, upper weld end plate or bored (φ 11 m m) to crossover connection; 6. cross-connection of choice more unit 6 mm2 copper-core cables or 25mm×4mm flat steel, has a length of pipe spacing appropriate margin, margin not less than 100mm, shielded wire selected 10 mm2 stranded bare copper soft wire, M10 bolt for crossover; 7. process piping and heating tubes in addition to the use of fastening and wired for crossover, with heat pipe inlet port and back to the nozzle should be commensurate with the technological pipeline support; 8. metal crossover pipes installed cathodic protection section, should not do static grounding. 25 handling stack, terminal area of grounding systems: 1. flammable and combustible liquids of railway working areas, the Wharf area of piping, equipment and support, building (construction) construction of metal body and rail (except for cathodic protection) should be connected to electrical circuit and grounding; 2. rail's rail end crossover and grounding wires should reference the relevant provisions of the Ministry of railways; 3. 　　Storage tank to the terminal by the pipeline between the provisions of the relevant provisions of the anti-static grounding; 4. stack station to loading and unloading of tanker and pipelines without electrical connection (including crossover cable) should be installed on the oil pipeline located 105 ~ 108 Ω insulating flanges or installation of insulation pipe segment. 26 mobile device implementation of grounding measures: 1. used for storage and transportation of flammable, combustible liquids, small mobile devices should implement ESD grounding; 2. the railway tanks (tank) car and railway rails should be connected to electrical circuit and grounding,A railway tanks (tank) car should be the relevant provisions of the periodic test grounding, and ensure good conditions; 3. the vehicle tank (Groove) van body should have a grounding connection end-plate, the end-plate and tanks (tank) car should be connected to electrical pathway, at the same time, the vehicle tank (Groove) car should not be using a metal chain received a wire, a 140-200 Ω conductive received.