標(biāo)準(zhǔn)編號(hào):	GB/T 20801-2020
中文名稱:	壓力管道規(guī)范 工業(yè)管道 (GB/T 20801.1-2020~GB/T 20801.6-2020)
英文名稱:	Pressure piping code—Industrial piping (GB/T 20801.1-2020~GB/T 20801.6-2020)
行業(yè)分類:	GB    國(guó)家標(biāo)準(zhǔn)
發(fā)布機(jī)構(gòu):	國(guó)家市場(chǎng)監(jiān)督管理總局 國(guó)家標(biāo)準(zhǔn)化管理委員會(huì)
發(fā)布日期:	2020-03-06
實(shí)施日期:	2020-10-1
標(biāo)準(zhǔn)狀態(tài):	valid
替代舊標(biāo)準(zhǔn):	GB/T 20801-2006 壓力管道規(guī)范 工業(yè)管道 (GB/T 20801.1-2006~GB/T 20801.6-2006)
翻譯語(yǔ)言:	英文
文件格式:	PDF
中文字符數(shù):	271000 字
翻譯價(jià)格(元):	14000.0
交付時(shí)間:	付款后 1 個(gè)工作日

GB/T 20801-2020 (GB/T 20801.1~GB/T 20801.6-2020) GB/T 20801 consists of the following six parts under the general title of Pressure piping code - Industrial piping: ——Part 1: General; ——Part 2: Materials; ——Part 3: Design and calculation; ——Part 4: Fabrication and assembly; ——Part 5: Inspection and testing; ——Part 6: Safeguarding. Codeofchina.com is in charge of this English translation. In case of any doubt about the English translation, the Chinese original shall be considered authoritative. GB/T 20801 consists of the following six parts under the general title of Pressure piping code - Industrial piping: ——Part 1: General; ——Part 2: Materials; ——Part 3: Design and calculation; ——Part 4: Fabrication and assembly; ——Part 5: Inspection and testing; ——Part 6: Safeguarding. Pressure piping code - Industrial piping - Part 1: General 1 Scope 1.1 GB/T 20801 specifies the basic requirements for the design, fabrication, assembly, inspection, testing and safeguarding of industrial metal pressure piping. 1.2 This part of GB/T 20801 specifies the basic requirements for pressure piping, such as application scope and piping grading. 1.3 The industrial metal pressure piping (hereinafter referred to as “pressure piping”) in this part includes the pressure piping for process devices, auxiliary devices and utility works within the battery limit. This part is applicable to the piping with the following conditions: a) The pressure piping with the maximum working pressure greater than or equal to 0.1MPa (gauge pressure) and a nominal diameter greater than or equal to 50mm, for which the medium may be gas, liquefied gas, steam or flammable, explosive, toxic and corrosive liquid with the maximum working temperature greater than or equal to the standard boiling point. The piping and equipment piping with a nominal diameter less than 150mm and the maximum working pressure less than 1.6MPa (gauge pressure) for conveying non-toxic, nonflammable and non-corrosive gases is excluded. b) Pressure piping other than those listed in 1.5. 1.4 The exclusion scope of this part is as follows: a) special requirements for reconstruction, examination, inspection, test, maintenance and repair of in-service pressure piping; b) piping with a nominal pressure greater than PN420; c) non-metal piping or lining layers thereof. 1.5 The non-application scope of this part is as follows: a) piping of military equipment and nuclear facilities; b) piping of exploration and excavation devices for petroleum, natural gas, terrestrial heat, etc.; Pressure piping code - Industrial piping - Part 2: Materials 1 Scope This part of GB/T 20801 specifies the basic requirements of materials for pressure piping components, including requirements for the selection of materials, the service restrictions based on material properties, marking, inspection certificate, etc. This part is applicable to the selection and use of materials for pressure piping components defined by GB/T 20801.1. 2 Normative references The following referenced documents are indispensable for the application of this document. For dated references, only the edition cited applies. For undated references, the latest edition of the referenced document (including any amendments) applies. GB/T 229 Metallic materials - Charpy pendulum impact test method GB/T 1220 Stainless steel bars GB/T 1348 Spheroidal graphite iron castings GB/T 2882 Nickel and nickel alloy tube GB/T 3077 Alloy structure steels GB/T 3087 Seamless steel tubes for low and medium pressure boiler GB/T 3091 Welded steel pipes for low pressure liquid transmission GB/T 3098.1 Mechanical properties of fasteners - bolts, screws and studs GB/T 3098.6 Mechanical properties of fasteners - Stainless steel bolts, screws and studs GB/T 3624 Titanium and titanium alloy seamless tubes GB/T 4334 Corrosion of metals and alloys - Test methods for intergranular corrosion of stainless steels GB/T 4437.1 Aluminium and aluminium alloy extruded tubes - Part 1: Seamless tubes GB/T 5310 Seamless steel tubes and pipes for high pressure boiler GB/T 6479 Seamless steel tubes for high-pressure for chemical fertilizer equipment GB/T 6614 Titanium and titanium alloy castings GB/T 6893 Aluminium and aluminium alloys cold drawn(rolled) seamless tubes GB/T 8163 Seamless steel pipes for liquid service GB/T 9439 Grey iron castings GB/T 9440 Malleable iron castings GB/T 9711 Petroleum and natural gas industries - Steel pipe for pipeline transportation systems GB/T 9948 Seamless steel tubes for petroleum cracking GB/T 12228 General purpose industrial valves - Specification of carbon steel forgings GB/T 12229 General purpose industrial valves - Specification of carbon steel castings GB/T 12230 General purpose industrial valves - Specification of stainless steel castings GB/T 12771 Welded stainless steel pipes for fluid transport GB/T 12778 Determination of Charpy impact fracture surface for metallic materials GB/T 13295 Ductile iron pipes, fittings and accessories for water or gas applications GB/T 13401 Steel buttwelding pipe fittings - Technical specification GB/T 14976 Seamless stainless steel pipes for fluid transport GB/T 16253 Steel castings for pressure purposes GB/T 18984 Seamless steel tubes for low-temperature-service piping GB/T 20801.1-2020 Pressure piping code - Industrial piping - Part 1: General GB/T 20801.3-2020 Pressure piping code - Industrial piping - Part 3: Design and calculation GB/T 20801.4-2020 Pressure piping code - Industrial piping - Part 4: Fabrication and assembly GB/T 20801.5-2020 Pressure piping code - Industrial piping - Part 5: Inspection and testing GB/T 20801.6-2020 Pressure piping code - Industrial piping - Part 6: Safeguarding GB/T 21832 (all parts) Welded austenitic-ferritic (duplex) stainless steel tubes and pipes GB/T 21833 Seamless austenitic-ferritic (duplex) stainless steel tubes and pipes GB/T 25137 Titanium and titanium alloy forgings GB/T 26027 Aluminium and aluminium alloys drawn seamless tubes for large circumscribed circle diameter of cross section GB/T 26030 Nickel and nickel alloy forgings GB/T 26057 Titanium and titanium alloy welded tube GB/T 26058 Extruded tube of titanium and titanium alloys GB/T 27684 Seamless and welded fittings for titanium and titanium alloy GB/T 29168.1 Petroleum and natural gas industries - Induction bends, fittings and flanges for pipeline transportation systems - Part 1: Induction bends GB/T 29168.2 Petroleum and natural gas industries - Induction bends, fittings and flanges for pipeline transportation systems - Part 2: Fittings GB/T 29168.3 Petroleum and natural gas industries - Induction bends, fittings and flanges for pipeline transportation systems - Part 3: Flanges GB/T 30059 Seamless corrosion-resisting alloy tubes for heat-exchanger GB/T 31032 Welding and acceptance standard for steel pipings and pipelines GB/T 32964 Welded stainless steel pipes for liquefied natural gas HG/T 20537.3 Technical requirements of welded austenitic stainless steel pipes for chemical plants HG/T 20537.4 Technical requirements of large-diameter welded austenitic stainless steel pipe for chemical plants HG/T 20634 Bolting for use with steel pipe flanges (Class designated) JB/T 5263 Specification for steel casting for power station valves JB/T 7248 Technical specification for low temperature service steel casting for valves NB/T 47008 Carbon and alloy steel forgings for pressure equipment NB/T 47009 Alloy steel forgings for low temperature pressure equipment NB/T 47010 Stainless and heat-resisting steel forgings for pressure equipments NB/T 47013.2-2015 Nondestructive testing of pressure equipment - Part 2: Radiographic testing NB/T 47013.3-2015 Nondestructive testing of pressure equipment - Part 3: Ultrasonic testing NB/T 47014 Welding procedure qualification for pressure equipment NB/T 47028 Nickel and nickel alloy forgings for pressure vessels NB/T 47029 Aluminium and aluminium alloy forgings for pressure vessels SY/T 5037 Submerged arc-welded steel pipe for common fluid service pipeline YB/T 4173 Forged and bored seamless steel pipes with heavy wall for high-temperature service ASTM A333 Specification for seamless and welded steel pipe for low - Temperature service ASTM A671 Specification for electric-fusion-welded steel pipe for atmospheric and lower temperatures ASTM A691 Specification for carbon and alloy steel pipe, electric fusion welded for high pressure service at high temperatures ASTM B361 Standard specification for factory made wrought aluminum and aluminum alloy welding fittings ASTM B366 Standard specification for factory made wrought nickel and nickel alloy fittings ASTM B444 Standard specification for nickel-chromium-molybdenum-columbium alloys (UNS N06625 and UNS N06852) and nickel-chromium-molybdenum-silicon alloy (UNS N06219) pipe and tube ASTM B619 Standard specification for welded nickel and nickel cobalt alloy pipe ASTM B622 Standard specification for seamless nickel and nickel cobalt alloy pipe and tube 3 Terms and definitions For the purposes of this document, the terms and definitions defined in GB/T 20801.1-2020, GB/T 20801.3-2020, GB/T 20801.4-2020, GB/T 20801.5-2020 and GB/T 20801.6-2020 as well as the following apply. 3.1 low temperature and low stress service working conditions that need to meet the following conditions at the same time: a) The maximum working pressure at low temperature is not more than 30% of the maximum allowable working pressure at normal temperatures; b) The sum of axial tensile stress of piping caused by pressure, weight and displacement (in calculating displacement stress, the stress amplification coefficient is not included) is not more than 30% of the allowable stress value of the material at normal temperature and not more than 50 MPa Note: The maximum allowable working pressure of straight pipe and butt welded pipe fitting shall be calculated using equations given in GB/T 20801.3-2020 or determined by type test; that of flange and valve components shall be selected as the rating at normal temperature pressure specified in the corresponding standard. 3.2 lower temperature and lower stress service working conditions that need to meet the following conditions at the same time: a) The maximum working pressure at low temperature is not more than 80% of the maximum allowable working pressure at normal temperatures; b) The sum of axial tensile stress of piping caused by pressure, weight and displacement (in calculating displacement stress, the stress amplification coefficient is not included) is not more than 80% of the allowable stress value of the material at normal temperatures 3.3 electric-resistance welded pipe; ERW continuous butt welded pipe (coil) under pressure, using itself as the current circuit, and heated by resistance 3.4 electric-fusion welded pipe; EFW longitudinally butt-welded pipe on the preformed blank by automatic or manual arc welding 3.5 plate welded pipe electric-fusion welded pipe, with one or two longitudinal straight welds, preformed into a tubular shape from a flat plate 3.6 inspection certificate a form of material quality certificate, which is an inspection document. It is recorded with the inspection result obtained by the following process: independent authorized departments or personnel other than the production department of the manufacturer inspect and test the delivered products in batches (or by sampling) according to the requirements of the standards and the provisions of the contract, and indicate the results on such document

——Part 1: General; ——Part 2: Materials; ——Part 3: Design and calculation; ——Part 4: Fabrication and assembly; ——Part 5: Inspection and testing; ——Part 6: Safeguarding.

GB/T 20801《壓力管道規(guī)范 工業(yè)管道》分為以下6個(gè)部分： ——第1部分：總則； ——第2部分：材料； ——第3部分：設(shè)計(jì)和計(jì)算； ——第4部分：制作與安裝； ——第5部分：檢驗(yàn)與試驗(yàn)； ——第6部分：安全防護(hù)。 本部分為GB/T 20801的第1部分。 本部分按照GB/T 1.1—2009給出的規(guī)則起草。 本部分代替GB/T 20801.1—2006《壓力管道規(guī)范 工業(yè)管道 第1部分：總則》，與GB/T 20801.1—2006相比，除編輯性修改外主要技術(shù)變化如下： ——根據(jù)特種設(shè)備目錄，修改了標(biāo)準(zhǔn)的適用范圍[見(jiàn)1.3 a)，2006年版的1.3.1]； ——采用排除法，修改了標(biāo)準(zhǔn)的適用范圍[見(jiàn)1.3 b)，2006年版的1.3.2]； ——修改了標(biāo)準(zhǔn)的不適用范圍與不包括范圍(見(jiàn)1.4、1.5，2006年版的1.4、1.5)； ——修改了本部分用管道組成件的定義(見(jiàn)3.5，2006年版的3.5)； ——修改了介質(zhì)危險(xiǎn)性的有關(guān)定義(見(jiàn)3.9、3.10、3.11，2006年版的3.10、3.11)； ——增加了“氣體”的有關(guān)定義(見(jiàn)3.12)； ——根據(jù)有關(guān)行政許可，修改了壓力管道GC1、GC2、GC3級(jí)的劃分(見(jiàn)4.1、4.2，2006年版的4.1、4.2、4.3)； ——增加了“壓力管道中介質(zhì)毒性和易燃性分類”(見(jiàn)附錄A)。 本部分由全國(guó)鍋爐壓力容器標(biāo)準(zhǔn)化技術(shù)委員會(huì)(SAC/TC 262)提出并歸口。 本部分所代替標(biāo)準(zhǔn)的歷次版本發(fā)布情況為： ——GB/T 20801.1—2006。 壓力管道規(guī)范 工業(yè)管道 第1部分：總則 1 范圍 1.1 GB/T 20801規(guī)定了工業(yè)金屬壓力管道設(shè)計(jì)、制作、安裝、檢驗(yàn)、試驗(yàn)和安全防護(hù)的基本要求。 1.2 GB/T 20801的本部分規(guī)定了壓力管道的適用范圍和管道分級(jí)等基本要求。 1.3本部分所指工業(yè)金屬壓力管道(以下簡(jiǎn)稱“壓力管道”)包括了工藝裝置、輔助裝置以及界區(qū)內(nèi)公用工程所屬的壓力管道。 本部分適用于下列條件的管道： a)最高工作壓力大于或等于0.1 MPa(表壓)，介質(zhì)為氣體、液化氣體、蒸汽或可燃、易爆、有毒、有腐蝕性、最高工作溫度高于或等于標(biāo)準(zhǔn)沸點(diǎn)的液體，且公稱直徑大于或等于50 mm的壓力管道。公稱直徑小于150 mm，且其最高工作壓力小于1.6 MPa(表壓)的輸送無(wú)毒、不可燃、無(wú)腐蝕性氣體的管道和設(shè)備本體所屬管道除外。 b)除1.5列出以外的壓力管道。 1.4本部分不包括范圍如下： a)在役壓力管道改造、檢查、檢驗(yàn)、試驗(yàn)、維護(hù)和修理等方面的專門要求； b)公稱壓力為PN420以上的管道； c)非金屬管道或其襯里層。 1.5本部分不適用范圍如下： a)軍事裝備和核設(shè)施的管道； b)石油、天然氣、地?zé)岬瓤碧胶筒删蜓b置的管道； c)移動(dòng)設(shè)備如鐵道機(jī)車、汽車、船舶、航空航天器等上的壓力管道； d)GA類長(zhǎng)輸管道； e)GB類公用管道； f)GCD類動(dòng)力管道； g)鍋爐、壓力容器以及加熱爐的內(nèi)部管道以及設(shè)備的外接管口； h)設(shè)計(jì)壓力低于0.1 MPa(表壓)但不低于大氣壓的輸送無(wú)毒、不可燃、無(wú)腐蝕性流體的管道。 2規(guī)范性引用文件 下列文件對(duì)于本文件的應(yīng)用是必不可少的。凡是注日期的引用文件，僅注日期的版本適用于本文件。凡是不注日期的引用文件，其最新版本(包括所有的修改單)適用于本文件。 GB/T 20801.2壓力管道規(guī)范 工業(yè)管道 第2部分：材料 GB/T 20801.3壓力管道規(guī)范 工業(yè)管道 第3部分：設(shè)計(jì)和計(jì)算 GB/T 20801.4壓力管道規(guī)范 工業(yè)管道 第4部分：制作與安裝 GB/T 20801.5壓力管道規(guī)范 工業(yè)管道 第5部分：檢驗(yàn)與試驗(yàn) GB/T 20801.6壓力管道規(guī)范 工業(yè)管道 第6部分：安全防護(hù) GB 30000(所有部分)化學(xué)品分類和標(biāo)簽規(guī)范 GB 50016—2014建筑設(shè)計(jì)防火規(guī)范 GB 50160—2008石油化工企業(yè)設(shè)計(jì)防火標(biāo)準(zhǔn) 危險(xiǎn)化學(xué)品目錄(2015版) 3術(shù)語(yǔ)和定義 GB/T 20801.2、GB/T 20801.3、GB/T 20801.4、GB/T 20801.5和GB/T 20801.6界定的以及下列術(shù)語(yǔ)和定義適用于本文件。 3.1 管道piping 由管道組成件裝配而成，用于輸送、分配、混合、分離、排放、計(jì)量或截止流體流動(dòng)的系統(tǒng)。 注：除管道組成件外，還包括管道支承件，但不包括支承構(gòu)筑物，如建筑框架、管架、管廊和底座(管墩或基礎(chǔ))等。 3.2 公稱壓力 nominal pressure；PN 由字母PN和無(wú)因次整數(shù)數(shù)字組成，代表管道組成件壓力等級(jí)的參數(shù)。 3.3 公稱直徑 nominal diameter；DN 由字母DN和無(wú)因次整數(shù)數(shù)字組成，代表管道組成件規(guī)格的參數(shù)。 3.4 管子pipe；tube 用以輸送流體或傳遞流體壓力的密封中空連續(xù)體。 3.5 管道組成件piping component 用于連接或裝配成壓力密封的管道系統(tǒng)機(jī)械元件。 注：包括壓力管道元件(管子、管件、閥門、法蘭、補(bǔ)償器、密封元件、特種元件)、安全附件(安全閥、爆破片裝置、緊急切斷閥)，以及諸如緊固件、阻火器、膨脹節(jié)、撓性接頭、耐壓軟管、過(guò)濾器、管路中的儀表(如孔板)和分離器等。 3.6 管道支承件pipe-supporting element 用于將管道荷載，包括管道的自重、輸送流體的重量、由于操作壓力和溫差所造成的荷載以及振動(dòng)、風(fēng)力、地震、雪載、沖擊和位移應(yīng)變引起的荷載等傳遞到管架結(jié)構(gòu)上去的元件。 注1：管道支承件分為固定件和結(jié)構(gòu)附件兩類。 注2：固定件包括懸掛式固定件如吊桿、彈簧吊架、斜拉桿、平衡錘、松緊螺栓、支撐桿、鏈條、導(dǎo)軌和固定架，以及承載式固定件，如鞍座、底座、滾柱、托座和滑動(dòng)支座等。 注3：結(jié)構(gòu)附件是指用焊接、螺栓連接或夾緊方法附裝在管道上的元件，如吊耳、管吊、卡環(huán)、管夾、U形夾和夾板等。 3.7 管件 fitting 管道組成件的一個(gè)類別，通常包括彎頭、三通、四通、彎管、異徑管、管帽、翻邊短節(jié)和活接頭等。 3.8 管架pipe support 用于支承管道的構(gòu)筑物。 注1：管道通過(guò)支承件將荷重和推力傳遞到管架上。 注2：管架由鋼結(jié)構(gòu)或鋼筋混凝土結(jié)構(gòu)的立柱、橫梁或框架所構(gòu)成，獨(dú)立固定在基礎(chǔ)上，也可固定在設(shè)備上或墻上。 注3：按類型分有獨(dú)柱式、雙柱式和懸臂式等。 3.9 急性毒性 acute toxicity 由一次性接觸導(dǎo)致人體死亡的化學(xué)品(介質(zhì))毒性指標(biāo)。按其LD50(經(jīng)口，經(jīng)皮)或LC50(吸入4 h)的半數(shù)致死量進(jìn)行危害程度的分類，詳見(jiàn)附錄A。 3.10 可燃?xì)怏w flammable gas 在20℃及101.3 kPa標(biāo)準(zhǔn)壓力下，與空氣混合有一定爆炸(易燃)范圍的氣體，詳見(jiàn)附錄A。 3.11 可燃液體 flammable liquid 具有一定閃點(diǎn)的液體(包括液化烴)，按其閃點(diǎn)及沸點(diǎn)高低分類，詳見(jiàn)附錄A。 3.12 氣體gas 除3.10的定義外，GB/T 20801范圍內(nèi)涉及的“氣體”還包括蒸汽、液化氣體、最高工作溫度高于或等于標(biāo)準(zhǔn)沸點(diǎn)的液體以及包括氣相的兩相或多相流體介質(zhì)。 4壓力管道分級(jí) 4.1 1.3 a)中列出的“壓力管道”按其危害程度和安全等級(jí)劃分為GC1級(jí)、GC2級(jí)： a)符合下列條件之一的壓力管道應(yīng)劃分為GC1級(jí)： 1)輸送《危險(xiǎn)化學(xué)品目錄(2015版)》中規(guī)定的毒性程度為急性毒性類別1介質(zhì)、急性毒性類別2氣體介質(zhì)和工作溫度高于其標(biāo)準(zhǔn)沸點(diǎn)的急性毒性類別2液體介質(zhì)的壓力管道。 2)輸送GB 50160—2008、GB 50016—2014中規(guī)定的火災(zāi)危險(xiǎn)性為甲、乙類可燃?xì)怏w或甲類可燃液體(包括液化烴)，并且設(shè)計(jì)壓力大于或等于4.0 MPa的壓力管道。 3)輸送除前兩項(xiàng)介質(zhì)以外的流體，并且設(shè)計(jì)壓力大于或等于10.0 MPa，或設(shè)計(jì)壓力大于或等于4.0 MPa且設(shè)計(jì)溫度高于或等于400℃的壓力管道。 b)符合下列條件的壓力管道(包括制冷管道)應(yīng)劃分為GC2級(jí)： 介質(zhì)毒性或易燃性危險(xiǎn)和危害程度、設(shè)計(jì)壓力和設(shè)計(jì)溫度低于4.1 a)規(guī)定(GC1級(jí))的壓力管道。 4.2 1.3 b)中列出的并且符合下列條件的壓力管道應(yīng)劃分為GC3級(jí)： 輸送無(wú)毒、不可燃、無(wú)腐蝕性液體介質(zhì)，設(shè)計(jì)壓力小于或等于1.0MPa且設(shè)計(jì)溫度高于-20℃但不高于185℃的壓力管道。 注：GC3級(jí)管道不適用于1.3 a)中列出的壓力管道。 4.3輸送毒性或易燃性危險(xiǎn)和危害程度不同的混合介質(zhì)時(shí)，應(yīng)按附錄A的規(guī)定，由業(yè)主或設(shè)計(jì)確定壓力管道等級(jí)。 5基本要求 5.1 壓力管道的建造材料應(yīng)符合GB/T 20801.2的規(guī)定。 5.2壓力管道的設(shè)計(jì)和計(jì)算應(yīng)符合GB/T 20801.3的規(guī)定。 5.3壓力管道的制作與安裝應(yīng)符合GB/T 20801.4的規(guī)定。 5.4壓力管道的檢驗(yàn)與試驗(yàn)應(yīng)符合GB/T 20801.5的規(guī)定。 5.5壓力管道的安全防護(hù)應(yīng)符合GB/T 20801.6的規(guī)定。 附 錄 A (規(guī)范性附錄) 壓力管道中介質(zhì)毒性和易燃性分類 A.1 一般規(guī)定 A.1.1 壓力管道中介質(zhì)的危害和危險(xiǎn)程度、分類原則以及定義是以GB 50160—2008、GB 50016—2014、《危險(xiǎn)化學(xué)品目錄(2015版)》和GB 30000的規(guī)定為基礎(chǔ)確定的。 A.1.2介質(zhì)危害性系指在生產(chǎn)和儲(chǔ)存過(guò)程中因事故泄漏致使介質(zhì)與人體接觸、發(fā)生火災(zāi)引起的健康危害和安全危險(xiǎn)程度，用介質(zhì)的毒性及易燃性表示。其危害和危險(xiǎn)程度的劃分分別按A.2和A.3的規(guī)定確定。 A.1.3一種化學(xué)介質(zhì)可能存在多種危害和危險(xiǎn)種類，應(yīng)分別按照GB 30000.2～GB 30000.29進(jìn)行評(píng)估，確定其危害程度或危險(xiǎn)性，以高者為基準(zhǔn)。 A.1.4 A.2和A.3列入的危險(xiǎn)化學(xué)品及其混合物應(yīng)視為有毒、易燃的危險(xiǎn)性介質(zhì)。 A.2易燃性 A.2.1可燃?xì)怏w 按照GB 50160—2008及GB 50016—2014的規(guī)定，壓力管道涉及的可燃?xì)怏w分類見(jiàn)表A.1。 表A.1 可燃?xì)怏w 名稱 類別 判據(jù) GB 50160—2008 可燃?xì)怏w 甲 與空氣混合物的爆炸下限不大于10％(體積分?jǐn)?shù)) 乙 與空氣混合物的爆炸下限大于或等于10％(體積分?jǐn)?shù)) A.2.2可燃液體 按照GB 50160—2008及GB 50016—2014的規(guī)定，壓力管道涉及的可燃液體分類見(jiàn)表A.2。 表A.2可燃液體 名稱 類別 判據(jù) GB 50160—2008 可燃液體 甲A(液化烴) 沸點(diǎn)不高于15℃的烴類液體及其他類似液體 甲B 甲A類以外閃點(diǎn)低于28℃的液體 乙A 閃點(diǎn)高于或等于28℃且低于或等于45℃的液體 乙B 閃點(diǎn)高于28℃且低于60℃的液體 丙A 閃點(diǎn)高于或等于60℃且低于或等于120℃的液體 丙B 閃點(diǎn)高于120℃的液體 注：工作溫度高于其閃點(diǎn)的乙類可燃液體視為甲B類可燃液體。工作溫度高于其閃點(diǎn)的丙類可燃液體視為乙類可燃液體。 A.2.3 其他可燃介質(zhì) 《危險(xiǎn)化學(xué)品目錄(2015版)》中列入的下列可燃介質(zhì)應(yīng)根據(jù)其火災(zāi)危險(xiǎn)性(易燃性)、閃點(diǎn)和介質(zhì)的狀態(tài)(氣、液、固)視為表A.1或表A.2規(guī)定的甲、乙類可燃?xì)怏w或甲類可燃液體(包括液化烴)： a)氣溶膠(類別1)、氧化性氣體(類別1)、遇水放出易燃?xì)怏w的物質(zhì)和混合物(類別1、2、3)； b)易燃固體(類別1、2)、自燃固體(類別1)、氧化性固體(類別1、2、3)； c)自燃液體(類別1)、氧化性液體(類別1、2、3)； d)有機(jī)過(guò)氧化物(類別A、B、C、D、E、F)、自反應(yīng)物質(zhì)和混合物(類別A、B、C、D、E)、自熱物質(zhì)和混合物(類別1、2)。 A.2.4混合物的易燃性 混合物(介質(zhì))的易燃性按相應(yīng)GB 30000的規(guī)定進(jìn)行評(píng)估。 A.3 毒性 A.3.1 有毒介質(zhì)和急性毒性 按照《危險(xiǎn)化學(xué)品目錄(2015版)》和GB 30000.18的規(guī)定，壓力管道涉及的有毒介質(zhì)應(yīng)根據(jù)其急性毒性進(jìn)行分類，見(jiàn)表A.3。 表A.3急性毒性類別 接觸途徑 單位 危害類別1 (劇毒) 危害類別2 (有毒) 危害類別3 (有毒) 經(jīng)口LD50 mg/kg ≤5 ≤50 ≤300 經(jīng)皮LD50 mg/kg ≤50 ≤200 ≤1 000 吸入氣體LC50 mL/L ≤0.1 ≤0.5 ≤2.5 吸入蒸汽LC50 mg/L ≤0.5 ≤2.0 ≤10 吸入粉塵和煙霧LC50 mg/L ≤0.05 ≤0.5 ≤1.0 注1：LC50(吸入4 h，50％致死濃度)：化學(xué)品在空氣中或水中造成一組試驗(yàn)動(dòng)物50％(一半)死亡的濃度。 注2：LD50：一次全部給予造成一組試驗(yàn)動(dòng)物50％(一半)死亡的化學(xué)品數(shù)量。 注3：表中的吸入臨界值以4 h接觸試驗(yàn)為基礎(chǔ)，根據(jù)1 h接觸產(chǎn)生的現(xiàn)有吸入毒性數(shù)據(jù)的換算：對(duì)于氣體和蒸汽，除以因子2，對(duì)于粉塵和煙霧，除以因子4。 注4：《危險(xiǎn)化學(xué)品目錄(2015版)》中注明的劇毒介質(zhì)可視為急性毒性類別1。 A.3.2混合物的毒性 混合物(介質(zhì))的毒性應(yīng)按GB 30000.18中規(guī)定的混合物分類標(biāo)準(zhǔn)進(jìn)行評(píng)估。