1、 KSKSKSKSKSKSKSK KSKSKS KSKSK KSKS KSK KS KS V 7474 KS V 7474: 2012 2012 10 31 http:/www.kats.go.krKS V 7474:2012 : ( ) ( ) () () () ( ) : (http:/www.standard.go.kr) : :2012 10 31 2012-0574 : : ( 02-509-7274) (http:/www.kats.go.kr). 10 5 , . KS V 7474:2012 i . iii 1 1 2 1 3 .1 4 .3 4.1 (body) 3 4.2
2、(nozzle)3 4.3 (disc) 3 4.4 (cover) .3 4.5 (diaphragm) 3 5 4 6 .5 7 5 7.1 .5 7.2 5 7.3 5 7.4 5 7.5 6 7.6 6 8 .6 8.1 .6 8.2 .7 8.3 .8 8.4 8 8.5 .9 9 .10 9.1 10 9.2 10 9.3 10 9.4 10 9.5 10 9.6 10 10 .10 10.1 10 10.2 11 10.3 11 10.4 12 10.5 12 10.6 13 KS V 7474:2012 ii 10.7 13 10.8 .13 10.9 (Fd) .13 10.
3、10 .13 11 .13 11.1 .13 11.2 14 11.3 14 11.4 14 12 .14 12.1 14 12.2 .14 12.3 14 KS V 7474:2012 iii . , , . , , . KS V 7474:2012 Safety valve for cargo tank of LNG carriers 1 (LNG) , , , , . 2 . . ( ) . KS B 0810, KS B ISO 4126 2, 2: KS B ISO 4126 4, 4: KS D 4103, En 10045(Part 1), Metal Products, Mec
4、hanical Tests, Charpy Impact Tests, Test Specimens, Testing Conditions API RP 520(Part 1), Sizing, Selection, and Installation of Pressure-relieving Devices in Refineries, Part I Sizing and Selection API STD 526, Flanged Steel Pressure Relief Valves API STD 527, Seat Tightness of Pressure Relief Val
5、ves ASME B 16.5, Pipe Flanges and Flanged Fittings ASME B 16.34, Valves Flanged, Threaded and Welding End MSS SP-055, Quality Standard for Steel Castings for Valves, Flanges and Fittings and Other Piping Components Visual Method for Evaluation of Surface Irregularities 3 . 3.1 . , . KS V 7474:2012 2
6、 3.2 (set pressure) KS B ISO 4126 4, 3.3.1 . 3.3 (reset pressure) , (3.6) “0” (1 ) KS B ISO 4126 4, 3.3.5 . 3.4 (blowdown) (3.2) (3.3) , (3.2) KS B ISO 4126 4, 3.3.10 . 3.5 (vacuum set) (3.1) 3.6 (lift) KS B ISO 4126 4, 3.4 3.7 (flow area) , A . KS B ISO 4126 4, 3.5 . 3.8 . KS B ISO 4126 4, 3.7.1 .
7、3.9 KS B ISO 4126 4, 3.7.2 . KS V 7474:2012 3 4 4.1 (body) . 4.2 (nozzle) , . 4.3 (disc) . , . 4.4 (cover) . 4.5 (diaphragm) . KS V 7474:2012 4 1 ( ) 5 5.1 . 5.2 . 5.3 . 5.4 , . 5.5 , , . . 5.6 . ( ) KS V 7474:2012 5 5.7 , . 5.8 1.1 . 5.9 . 6 6.1 , , / . LNG . 6.2 (sealing) ( 163 ) . 6.3 , KS D 4103
8、 SSC ( ASTM A351 CF8M) . 6.4 SUS 316 . 6.5 . 7 7.1 , . 7.2 , KS B 0810 V EN 10045(Part 1) ( 196 ). 7.3 . (RT: radiographic test) , . 7.4 KS V 7474:2012 6 7.4.1 , , , ASME B 16.34 BS 6364 1.5 ( 1.5) , . 7.4.2 . (fresh water) . 7.4.3 15 . 7.4.4 2 . 2 7.5 , (burr), . , KS B ISO 4126 2 . 7.6 7.6.1 (forg
9、ings) (crack) . 7.6.2 . . 8 8.1 8.1.1 KS V 7474:2012 7 . 1 . 1 : KPaG (Cargo tank) 25 KPaG* 10 %* (actual set pressure of specification) . 8.1.2 , 50 . 8.1.3 . 8.1.4 . 8.2 8.2.1 . 8.2.2 (air) (N2) . 8.2.3 (set pressure) 90 % . 8.2.4 5 . 8.2.5 0.06 mL/min/inch . 8.2.6 KS V 7474:2012 8 3 . 1.0 mm 8.0
10、mm (API STD 527). 3 8.3 8.3.1 . 1 . 8.3.2 , 10 . 8.3.3 (He) . 8.3.4 . 8.4 8.4.1 ( ) 163 . . (LN2) . 8.4.2 . 8.4.3 8.0 mmT 1.0 mm12.7 mm KS V 7474:2012 9 4 . . 4 ( ) 8.5 8.5.1 . 8.5.2 163 . 8.5.3 (set pressure) 90 % . 8.5.4 1 . 8.5.5 0.06 mL/min/inch . : 0.06 mL/min/inch : , 8.5.6 3 . 1.0 mm 8.0 mm K
11、S V 7474:2012 10 (API STD 527). 9 9.1 LNG , . . , . 9.2 2 . 2 : KPaG (Cargo tank) (Vacuum set) 1 KPaG* 25 %* (actual set pressure of specification) . 9.3 . 9.4 (vacuum block) 1 . 9.5 , 1 . 9.6 . 10 10.1 , . a) , (flow rate) (Kd) KS V 7474:2012 11 b) ( ) c) d) e) , / a) , (Kd) , . , . 10.2 a) . b) 10
12、% c) 10% d) . e) . f) . g) , 9. . h) , . i) , . j) . , , , . 10.3 10.3.1 KS V 7474:2012 12 . 10.3.2 . 10.3.3 . 10.3.4 (chattering), / , . 10.4 , . ( ) 10.5 10.5.1 , . , . 10.5.2 (model) . 10.5.3 . 10.5.4 LNG , LNG . . KS V 7474:2012 13 , (cargo tank) , : ANSI 150LB 10B RF x ANSI 150LB 12B, RF : 25 K
13、PaG 10.6 3 . 10.7 3 . 10.8 , , . . . . , . 10.9 (Fd) Fd . 10.10 (Kd) Fd 90 % . Kd 0.9Fd Fd . 11 11.1 )(9.172112PPMPZTKKFWAcd= A : ( )(mm2) W : (kg/hr) F2 : K : P1 : (1 ) P2 : ( ) Fd : KS V 7474:2012 14 Kd : (Fd0.9) Kc : Z : T : (K : 273.15) M : 11.2 (vapour) . 11.3 API RP 520(3.6.3.1) . 11.4 SI . 12
14、 12.1 , . . a) ( ) ANSI 150LB 10B RF x ANSI 150LB 12B RF b) c) d) e) 12.2 . a) b) c) “G”, “A”, “S” 12.3 . . 153787 1 92 3(13) (02)26240114 (02)262401489 http:/ Korean Agency for Technology and Standards http:/www.kats.go.kr KS V 7474:2012 KSKSKS SKSKS KSKS SKS KS SKS KSKS SKSKS KSKSKS Safety valve for cargo tank of LNG carriers ICS 71.040.40;77.120.00