危险区域电气设备安装注意事项.ppt

installation of electrical equipment in hazardous areas,denial of ignition sources to flammable gases,it cannot be stressed how important the philosophies followed to deny ignition sources to flammable gases are. the smallest ignition source can lead to the most dire consequences,both far away deepwater horizon, gulf of mexico, april 2010,and close to home - pingyu coal & electric co ltd, yuzhou, henan province, october 2010,this presentation is based on the international elecrotechnical commissions publication iec-60079,there are other publications such as the national electric code (nec) in the usa that have also produced standards for hazardous areas but the equipment in this project will be to iec standards,the iec has over a century of experience producing electrical standards the first hazardous area standards were created for the mining industry and then expanded to include the oil and gas sector iec standards are not frozen in time but evolve for many reasons such as new materials being produced, technical advances are made and findings from disaster enquires to name but a few these standards are written to provide the best possible protection in the event of a gas escape utilising experience of prior disasters and the leading experts in the hazardous area field,flammable gases require only one source of ignition all equipment must comply with the regulations disaster news stories usually say there was an explosion all regulations must be adhered to = there can be no exceptions,the zones for this vessel can be found on drawing m40188-1030015 - hazardous area plan,plus - all equipment in exterior locations which is capable of operation after a shutdown is to be suitable for installation in zone 2 locations,there are various philosophies that are defined by the iec to deny source of ignition,note; there is a philosophy hierarchy, zone 0 equipment can be used in zones 1&2, zone 1 equipment can be used in zone 2,list of hazardous areas on hai yang shi you 981,bell nipple zone 1 shale shakers - zone 1 heli fuel area - zone 1 battery locker - zone 1 paint locker - zone 1 below heli deck - zone 1 crown zone 1 mud pits - zone 2 drill floor - zone 2 riser storage - zone 2 vents from enclosed hazardous areas zone 2 loading stations port and starboard zone 2 all equipment in exterior locations which is capable of operation after a shutdown is to be suitable for installation in zone 2 locations.,tips on inspection of ex equipment; (a full checklist is provided in the handout) equipment is correct for zone all cables must be armoured glands for exd should be exd or exde glands for exe should be exe or exde armour to be clamped by the gland for ex equipment blanks to be ex rated for exe equipment the glands and blanks thread length should be minimum 6mm or ip washer and internal lockout,when earth ring is used, this must be located between gland shoulder and ip washer exd, exe equipment earth wire should be minimum 2.5mm2 up to 16mm2 power conductor exi equipment earth wire should be minimum 4mm2 all terminations should only have one conductor per terminal all terminations should be correct and tight,wire insulation should be maintain right up to the metal of the terminal crimping tools of the hand rachet type must be used all spare conductors must be terminated both ends insulation resistance test to be carried out,equipment is incorrect for zone,uncertified for zone,correct certification,correct glands and installed to manufacturers instructions,as above gland incorrectly installed,correct size of gland,use of tape,blank plug uncertified,uncertified blank,blank plug to be certified and correctly installed,exe locknut required,incorrect use of earth ring,correct use of earth ring,two cores one terminal,correct connection of two cores into one terminal,incorrect termination,terminal rail to be fixed and free from vibration,exposed conductors,spare conductors to be terminated,cable support,incorrect use of tools,equipment is labeled correctly label to include; the name of the manufacturer or his registered trademark the manufacturers type identification the symbol ex the symbol for each type of protection used the symbol of the gas group for that equipment for group ii electrical equipment, the symbol for the temperature class a serial number except for small equipment and accessories,all the above photos are indeed from our rig the