As in grow in quantity of conduit of high-pressured large requirements, before by experience, check manual to try the method that approachs a head to satisfy spot need hard certainly, use especially compress air to try when pressing, press an accident because of sealing a head to choose undeserved happening to try even. The article designs standard and pipe fitting standard to be a basis with conduit of active pressure vessel, metal, discussion spot is commonly used try those who press formula of the computation that seal a head to choose, strengthen costal region to make the same score a lid to seal a design to undertake discussing to taking, growing test and verify applies for many times in celebrating gas field construction, these methodological safety, reliable, economy. 1 conduit tries the configuration that approachs a head commonly used conduit tries press a head to have seal a head elliptically (tubal cap) , smooth lid seals a head (smooth base, bear insert solder to make the same score a lid to seal head, belt to strengthen costal region to make the same score a lid to seal a head) , blind board flange and flange lid. The join form that presses its and conduit has: Become an organic whole with cylindrical shell or with cylindrical shell butt joint, solder with solder of cylindrical shell horn or other, bolt join, structural diagram detailed sees GB150, 1998 " steeliness pressure vessel " in watch 7, 7, GB12459, 90s | {J408, 90) " steeliness is not had to solder seam pipe fitting " , SHJ409, 90 " armor plate makes pair of solder not have seam pipe fitting " , GB50316, 2000 " design of industrial metal conduit is normative " watch 6. 6. 2 commonly used try the design that approachs a head to choose 2. 1 seal a head to be used at commonly elliptically large requirements, medium high-pressured conduit, press formula normally (1) computation pipe expresses date (Sch) or by formula (2) computation seals head wall thick, check GB12459 (SHJ408 next, SHJ409) chooses capable person tubal a cap qualitative, model, affirmatory code name (general DN300mm, PN6. 4 A above should use elliptic) tubal a cap. The circumstance that normal, gas tank works normally leaves oily area of 1000 (1)I I of Sch= × , sound wave divides ash implement time and automatic start, make convection Duan Chi piece on the canal accumulate ash to follow flue gas one case eduction, improve boiler efficiency thereby, drop smoke evacuation temperature. Brace up piece sound wave of type high-power excel in divides ash implement after field application, temperature of high-pressured boiler smoke evacuation can reduce 30 ℃ , boiler efficiency can rise 1. 2 ％ . 3 application effect (1) section oily effect is good. Ability changes around contrast to note steam boiler efficiency to rise on average 2. 4 ％ , a year of accumulative total is managing fuel 576t, price of every tons of crude is 1000 yuan, year of managing fuel expenses 57. 60 thousand yuan. (Clear grey cycle lengthens 2) . After ability changes, clear grey cycle lengthens 60d by average 20d, managing ash of many artificial Qing Dynasty uses water, reduced labor intensity of the worker greatly, the working environment that improved a worker effectively (3) is helpful for improving an environment. Because temperature of boiler smoke evacuation is reduced substantially, make circumjacent air quality is improved. (4) clear ash implemented automatic, activity in series, reduced the worker's amount of labor. One conduit of the P in type of = face C (2) designs pressure ／ MPa, try when pressing desirable proof pressure; [Stare at] the material below one design temperature is allowable stress ／ MPa; Ram of thick ／ of wall of a head; Coefficient of one welding line, integral punch =1; C wall of a head is large additional capacity, c=1-3ram; D; Mm of ／ of one conduit internal diameter. 2. 2 smooth lids seal a smooth lid to seal a head to be able to be used at small-bore low-pressure conduit to try pressure (DN200ram, PN 4. Appropriate of 0 SPa above uses ellipse to seal head or belt to strengthen costal region to make the same score lid) , computational method has 3 kinds: It is to press GB50316 " industrial metal conduit designs a standard " in the 6th. 6 computation, see formula (3) , apply to DN400mm, PN2. Conduit tries under 5 MPa pressure; 2 it is to press GB150, 1998 the 7th. 4 computation, see formula (4) ; 3 it is to press GB12459 pipe to express date Seh to decide the wall that seal a head is large, apply to forged steel of DN15 ～ DN80mm to make bear two class flat position welding is in charge of Seh80 of the pipe fitting that insert solder, Schl60 cap. Coefficient of feature of the Kl in type of C (4) of √ of C (3) 8=De of =Kl(Di 2C) √ , one structure, in seeing GB50316 standard, express 6. 6. 1; D, Mm of ／ of conduit computation diameter, general and desirable D =Di; One structure of K diagnostic coefficient, see GB150 is expressed 7. 7. Usually formulary (4) relatively (3) computation value slants big, with (when 4) form calculation makes the same score a lid to seal a head, because of K=0. T of 44 Ti ／ , ti is calculated for conduit the wall is large, can take approximately for conduit name wall thick T decreases 2 ～ 3mm, the effective wall that T is conduit is large, can take thick T of conduit name wall approximately, k=0 can be taken approximately when reason is calculated. One 2) of 44(t ／ ￡ , calculate in order to simplify. 2. When 3 belts strengthen costal region to make the same score a lid to seal a computational belt to strengthen costal region to make the same score a lid to seal head ply, generation of D of usable equivalent diameter enters formula (4) computation, formula also can be used when be being used at trying to press only (5) computation, equivalent diameter D pursues to be pressed according to propping up pitch diameter of 1 affirmatory the biggest inscribed circle. Belt of the C (5) austral √ of 0 · 51 Dc strengthens costal region to make the same score a lid to seal a head to should accord with tectonic requirement: Motherboard ply is not less than 8mm, prop up strengthen costal region to should wait for removed semmetry to decorate, ply of costal region board is not less than 10mm, h of height of costal region board should satisfy formula (the requirement of 6) . In H ≥ 10 (6) type [R]h sticks fillet weld allowable stress ／ MPa; Mm of ／ of height of one welding line. Graph 1 money strengthens costal region to make the same score a lid to seal a head 2. 4 blind board flange, flange builds blind board flange to press type (7) computation ply, flange lid chooses standard flange directly by design pressure. Factory - one =0 of Ij. C (7) Y L J 2 of ／ of 44 D. 5 other note is general and optional try to press medium to be clear water or compress air, design temperature ≤ 150"(2, large additional amount takes the wall that seal a head 1-3rnm, allowable stress is: When 20R material is qualitative, [Stare at] =130MPa; When 16Mn material is qualitative, [] =170MPa; (When 235 material of ／ are qualitative, [Stare at] =120MPa. Try the construction that controls a head to should press conduit nominal diameter, proof pressure reasonable choose, the wall that seal a head is large should express date or computation to decide by pipe, all welding line that seal a head need to use complete solder to show a structure, when profound error of wall of butt joint welding line is more than 3mm, should press 1: 3 rake transfer, high pressure seals a head to should detect via nondestructive in eligible square applicable, belt strengthen costal region to make the same score a lid to seal head appropriate to solder with be in charge of Duan Cheng to be opposite all the time via be being used after hydraulic experiment.

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