杭氧大型空分设备安装技术标准(英文).doc

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杭氧 工厂标准大型空分设备安装技术要求1. 适用范围1.1 this standard （规定） the requirements on installation of air separation plantdesigned and manufactured by hangzhou hangyang holding co., ltd 简称 hangyang).1.2 this standard is applicable for site installation of hangyang-designed-manufactured regular packed rectification columns of the switchover process and molecular sieve purification absorption process (including boosting type) as well as the air separation plants of full-rectification 制氩process, oxygen (nitrogen) internal compression process and liquid air separation.1.3 this standard is inapplicable for installation of compressor, turbine expander, pump, thestorage system of liquefied gas, 稀有gas 提取equipment and corresponding 按照their corresponding installation standard or technical documentation.1.4 当时the special requirement on the drawing and technical documentations, theinstallation shall be in compliance with the drawing and technical documentation. the installation unit may prepare detail rules of installation according to the requirement of this standard.2. 规范性 引用documentationsregulations of safe and technical supervision for pressure vessel (issued by the former 局 in 1999).steel pressure vessel, gb150-1998specifications of aluminum welded vessel, jb/t4734-2002technical conditions of oxygen pipe for air separation plant, jb/t 5902-2001.technical conditions of installation and welding for aluminum air separation plant,hta5411-2001general regulations of construction and acceptance of installation works of mechanical equipment, gb50231-1998general regulation of construction and acceptance of installation works of refrigeration equipment and air separation plant gb50274-1998general regulations of construction and acceptance of installation works of industrialmetallic pipeline works gb50235-1997non-destruction inspection for pressure vessel, jb4730oil removing and cleaning for metal product, ht8009-88slag wool, ht7075-83expanded pearlite.ht7012-823. foundation of cold box:3.1 the foundation of cold box of air separation column shall have sufficient strength and beprevented from settlement and inclination, and meanwhile the features of working under low temperature of the equipment placed on the foundation shall be well considered.3.2 the loads borne by the cold box foundation includes cold box, platform stair, valves, pipelines,column, vessels, and expanded pearlite and liquid media.3.3 the surface temperature of cold box foundation is from +30 to 90 during normalrunning and even 190 in case of liquid leakage.3.4 the cold box foundation body consists of foundation body, water-stop plate, cold insulationcourse and surface course.3.4.1 the foundation body is made of waterproof and frost-resistant concrete of animpermeability strength grade not below b12 and a frost-resistant strength grade not below mp75 and is pre-compressed with 1.5 times of the total weight of the equipment for 7 days to prevent the foundation from inclination. fig. 1surface course面层cold-insulating course隔冷层waterproof mortar防水砂浆 foundation body基础本体, water-stop plate隔水板3.4.2 the water-stop plate shall be welded or complete piece of 0.5mm thick copper sheet or0.8-1.0 mm thick stainless steel sheet.3.4.3 the cold insulation course is made by expanded pearlite concrete of a thickness not below300mm, compression strength not below 7.35mpaand heat conductivity not above0.2325w/mk.3.4.4 the surface course is 50mm thick fine sand concrete (admixed with 0.5% waterproofagent) of an impermeability strength grade not below b12 and a frost-resistant strength grade not below mp75.note: impermeability strength grade b12 means that under 1.176mpa hydraulic pressure no seepage occurs in concrete test block. the frost-resisting grade mp75 means that after 75 cycles offreezing-thawing the drop of strength of the concrete test block is less than 25%.3.5 after completion of foundation, its surface shall meet the following requirements:3.5.1 the surface shall be free of defects such as crack.3.5.2 the surface shall be clean without inclusion of inflammables such as wood board and felt.3.5.3 the surface flatness shall be less than 5/1000.3.5.4 the surface levelness shall be less than 5/1000, and the deviation of the entire length notabove 15mm. 3.6 after the qualification of foundation, the installation central line of vessel shall be set outaccording to the vessel layout, and the orientation of nose marked.4. pressure test and gas-tight test for the single unit (pressure vessel and valve)4.1 the test before positioning and installation of the pressure vessel4.1.1 each passage of the pressure vessel was filled with 0.02mpa sealing nitrogen beforedelivery and before positioning the sealing nitrogen pressure shall be measured with grade 1.5 pressure gauge. in case of the vessel having 2 or more passages, the pressure in a passage shall be measured and the sealing nitrogen completely vented, and after 30 minutes the pressure of other passage is measured.4.1.2 in case that the inspection of sealing nitrogen of multi-passage vessel is suspicious or thevessel is not provided with sealing nitrogen, the pressure test shall be carried out to check for internal leakage. if the pressure vessel is within the guarantee period and has qualification certificate and its package keeps intact it is unnecessary to carry out separate pressure test and gas-tight test before installation.4.1.3 outside the guarantee period, though the pressure vessel has qualification certificate andits package keeps intact, the gas-tight test shall be performed before installation.4.1.4 if the pressure vessel has no qualification, or is damaged, or is locally modified in site, itshall be subjected to separate strength test and gas-tight test before installation.4.1.5 no oxygen shall be used as the pressure-test gas.4.2 valve inspection and adjustment before installation:4.2.1 if the valve is within the guarantee period and has qualification certificate and its sealingfaces keep at good conditions, in general, separate pressure test and gas-tight test is unnecessary before installation.4.2.2 if the valve is within the guarantee period and has qualification certificate, but its sealingfaces are rusted or damaged, after treatment it shall be subjected to the gas-tight test.4.2.3 outside the guarantee period, though the valve has qualification certificate and its sealingfaces keep at good conditions, it shall be subjected to the gas-tight test.4.2.4 in case no qualification certificate or abnormal phenomenon (damage) of valve, it shall besubjected to separate strength test and gas-tight test before installation.4.2.5 the valve which shall be degreased and disassemble-inspected at site shall be subjected toseparate gas-tight test before installation.4.2.6 the sealing faces of automatic valve may be subjected to gas-tight test under workingpressure (0.6mpa) for 3 minutes and during the period the leakage rate shall be less than0.1l/min. after 5 cycles of opening/closing, the valve shall still meet the requirements. the automatic valvequalified in this inspection shall be soaked in liquid nitrogen for 15 minutes and thereafter its flap shall be able to free open and close without any seizure. the vale of leakage exceeding the criteria shall be lapped.4.2.7 the safety valve shall be subjected to individual tripping test according to therequirements of summary sheet of presetting values provided by the complete set manufacturer and then leaded after meeting the requirement. for the safety valve of a fore check valve, it shall be fully opened and leaded.adjusting valve:4.2.8.1 the leakage rate shall be inspected under the manual and pneumatic model separately. theleakage rate shall be in compliance with the relevant standard of manufacturer.4.2.8.2 the positioner shall be subjected to actuation test under the specified gas pressure andshall meet the requirement.4.2.8.3 leakage inspection for the stuffing box and flange-sealing faces shall be conducted andthere shall be no leakage.4.2.8.4 the leakage rate of pneumatic butterfly valve shall meet the requirements specified in thedrawing.4.3 media for the test:4.3.1 clean domestic water shall be used for hydraulic test and gas pressure test may beperformed for the vessels of complex structure or unsuitable for water as test media(rectification column, plate-fin heat exchanger, condensing evaporator, adsorber and filter)4.3.2 the dry oil free air or nitrogen is used in gas-tight test and cares shall be taken to preventfrom asphyxia in case of using nitrogen.5.1 before installation, all the pressure vessels, valves,