石油化工企业可燃气体和有毒气体检测报警设计规范(编辑修改稿)

石油化工企业可燃气体和有毒气体检测报警设计规范(编辑修改稿)内容摘要：

pe of m from the releasing source stipulated in Clause . For the leasing source of a bustible gas that is lighter than air stipulated in Clause located in a pletely or partially enclosed factory building, a or more detector(s) should be set at the highest point easy to accumulate the bustible gas in addition to a detector to be set above the leasing source. Storagetransportation Facilities For the storage tank used for liquefied hydrocarbons or liquids of Class Ab, the detectors should be set in the following positions: (1) A detector per 30m should be set inside the firewall of the liquefied hydrocarbon tank group, and the distance between the detector and the flange or valve of the drain outlet or bottom connection pipe of the tank should not be longer than 15m. (2) Inside the firewall of the liquids of Class Ab, a or more detector(s) should be set, and the distance between the detector and the flange or valve of the tank drain outlet, sampling port, or bottom (side) connection pipe should not be longer than 15 m. For the handling facilities used for liquefied hydrocarbons or the liquids of Class Ab, a or more detector(s) should be set at the following positions: (1) For the railroad platform equipped with small filling risers, a detector is set for every tank wagon length preferably, and the horizontal distance between the detector and the inlet of the wagon should not be longer than 15 m。 (2) For the railroad platform equipped with big filling risers, a detector is set preferably。 (3) The horizontal distance between the position filling tank car and the filling riser in an automobile handling station should not be longer than 15 m. The detector should be located in accordance with the stipulation in for Clause of the Specifications when there is a surge tank in the automobile handling station. Detectors for the pumps and pressors of the handling facilities should be set in — 7 — accordance with the stipulations in for Clauses through of the Specifications. Detectors in the filling station of liquefied hydrocarbons should be set in accordance with the following requirements: (1) For pletely or partially closed cylinderfilling workshop, the distance between the filling port and the detector should be within the range of。 (2) The pletely or partially closed cylinder warehouse should accord with the stipulations in for Clause of the Specifications. Around the warehouse partially in the open air, a detector should be set per 1530ml。 one detector should be set when the circumference is longer than 15 m。 (3) The distance between the detector and the drain outlet or valve group of the surge tank should be within the range of m. For the pletely or partially enclosed workshop to fill hydrogen cylinders, the detectors should be set in the highest point above the filling port, where the gas easily stays indoor. For the docks to handle liquefied hydrocarbons, liquids of Classes Ab and Ba, a detector should be set in the horizontal area of 15 m radius from the transferring arm. When the detector cannot be set so, the detection of the bustible gases should accord with the stipulations in for Clause of the Specifications. Toxic gas detectors used for toxic gas storage and transportation facilities should be set in accordance with the stipulations in for Clauses and . Locations where Combustible Gases and Toxic Gases Diffuse and Accumulate The detector or detectors should be set in a point 5m from the fired heater or outside the firewall between the heater and the equipment for the gases of Class A and liquefied hydrocarbons or a probable releasing sources in the case of abnormal running. A detector should be set in the control room, and power distribution room, as well as places within 30 m from the processing equipment set or storagetransportation for the gases Class A, toxic gases,liquefied hydrocarbons, and the liquids of Class Ab meeting the following conditions: (1) The door or window of the room faces the processing equipment set or storage –transportation facilities。 (2) The control room or power distribution room where the overground power cable troughs or tubes and pipelines for the instrument enter. A detector should be set in the nonexplosionproof online instrument cubicle located within Region2. For detection of the bustible gas lighter than air, the detector should be set the highest point where the bustible gases easily accumulate in the instrument cubicle. Detectors should be set on those spots out of the effectively detectable coverage of the detector: — 8 — (1) The lowest ground of pit and/or sewage ditch, where the bustible gases and /or toxic gas may accumulate, in the area of the processing unit or storagetransportation facilities which use or generate liquefied hydrocarbons, and /or toxic gases. (2) The corner pockets where the gases of Class A, toxic gases easily accumulate. 5. DETECTIONALARM SYSTEMS OF COMBUSTIBLE GASES AND TOXIC GASES System Composition and Performance Such a system should be a bustible gas alert instrument consisting either of a detector and an alarm of bustible gas or toxic gas, or of a detector and a indicatoralarm of bustible gas or toxic gas as its essential part. Besides, it also may be a detection and alarm system consisting of a special dataacquisition system and a detector. The system position should meet the following requirements: (1) For the detector that adopts mV signal, frequency signal, or 4~20mA signal as its output, it is remended to use an indicatoralarm as its special alarm controller。 a alarm consisting of a signal setter and a flash alarm unit also may be used。 the signal to the interlocking protection system and the alarm recorder preferably es from the alarm controller or the signal setter. (2) For。