1、 KS B 6941KSKSKSKSSKSKSKS KSKSKS SKSKS KSKS SKS KS LNG KS B 6941： 2007(2012 ) 2007 10 30 http:/www.kats.go.krKS B 6941： 2007 : ( ) ( ) () ( ) : (http:/www.standard.go.kr) ： ：2007 10 30 ：2012 12 3 2012-0666 ： ： ( 02-509-7274) (http:/www.kats.go.kr). 10 5 , . KS B 6941： 2007 i 1 1 2 1 3 .1 4 5 5 5 5.1
2、 5 5.2 .6 6 .6 6.1 (normal loading cases) 6 6.2 (abnormal loading cases) 8 6.3 .11 7 (pressure relief) .11 7.1 11 7.2 11 7.3 .12 7.4 .12 7.5 12 8 (commissioning) (decommissioning)13 8.1 13 8.2 (decommissioning)15 9 (Inspection and Tank Monitoring).15 9.1 15 9.2 (equipment)16 A( ) (guidance on operat
3、ion) 17 A.1 (cooldown of the tank)17 A.2 (over-fill) 17 A.3 (prevention of overpressure) 17 A.4 (prevention of excess internal negative pressure)18 A.5 .18 A.6 .20 B( ) LNG .21 B.1 .21 B.2 21 C( ) 23 C.1 .23 C.2 (pressure and vacuum relief) .23 C.3 27 C.4 .28 C.5 .29 KS B 6941： 2007 ii C.6 (protecti
4、on against explosion and impact)29 C.7 (lightning protection) .29 C.8 , .30 D( ) 31 D.1 .31 D.2 / 31 D.3 31 .33 KS B 6941： 2007 (2012 ) LNG General standard for LNG storage tank 1 LNG , . 9 % Ni ( ) ( , ) LNG , . , , (instrumentation) . LNG , (seismic analysis) . 2 2.1 BS 7777： 1993, Flat-bottomed,
5、vertical, cylindrical storage tanks for low temperature service 2.2 BS EN 1473： 1997, Installation and equipment for liquefied natural gas Design of onshore installations 2.3 NFPA 59A： 1990, Production, storage, and handling of liquefied natural gas(LNG) 2.4 API 620： 2002, Design and construction of
6、 large, welded, low-pressure storage tanks 2.5 API 2000： 1998, Venting atmospheric and low-pressure storage tanks nonrefrigerated and refrigerated 3 . 3.1 “LNG (storage tanks)” 162 LNG LNG . 9 % Ni ( , ), ( , , ), , (steel structure dome), (suspended deck) ( 1 5 ). 3.2 “9 % Ni ” 9 % Ni KS B 6941： 20
7、07 2 , . (full containment type) 1 m 2 m . . LNG (venting) . 3.3 “ ” LNG , LNG LNG . (gastight containment) . LNG . 3.4 “ (aboveground storage tank)” . 3.5 “ (inground storage tank)” LNG . 3.6 “ (underground storage tank)” . 3.7 “ (boil-off)” . 3.8 “ (roll-over)” LNG , . 3.9 “ (inner tank)” (cylinde
8、r) , . 3.10 “ (outer tank)” (cylinder) . 3.11 “ (shell)” . 3.12 “ (wall)” . 3.13 “ (roof)” . 3.14 “ (suspended deck)” KS B 6941： 2007 3 . 3.15 “ (prestressed concrete)” PS PS . 3.16 “ (reinforced concrete)” ( “RC” ). 3.17 “ (insulation)” . 3.18 “ (membrane)” (薄膜 ) . 3.19 “ (maximum operating pressur
9、e)” . 3.20 “ (purchaser)” LNG , , , (commissioning) (contractor) . 3.21 “ (contractor)” LNG , , , . ( )9% Ni 1 9 % Ni ( ) 9 % Ni KS B 6941： 2007 4 ( )9% Ni 2 9 % Ni ( ) ( ) 3 ( ) 9 % Ni KS B 6941： 2007 5 ( ) 4 ( ) ( ) 5 ( ) 4 . , . 5 5.1 KS B 6941： 2007 6 , , . , . 5.2 (loadings), (conditions) (cons
10、iderations) . 5.2.1 a) b) , , c) 5.2.2 a) b) c) (maintenance hazards) d) e) (over-fill) f) (process overpressure) g) h) (major metal failure), ： (brittle fracture) i) (minor metal failure), ： j) (metal fatigue) k) l) , (failure of pipework) m) 5.2.3 a) b) , c) d) e) 6 . 6.1 (normal loading cases) 6.
11、1.1 KS B 6941： 2007 7 6.1.1.1 (dead load) . a) b) c) d) e) , , (platform), f) g) 6.1.1.2 , . . a) 24.52 kN/m3, 23.05 kN/m3b) 76.98 kN/m3c) 7.85 kN/m36.1.2 (imposed loads) . a) (general loads) 1.2 kPa . 300 mm300 mm 5 kN . 2.4 kPa . (snow loading) (internal negative loading) . 1.0 kPa . . b) (snow lo
12、ads) a) . c) (internal negative pressure loads) 5 kPa . d) (insulation pressure loads) 9 % Ni , (annular space) (loose powder insulation) . , . (resilient blanket) . e) / . LNG (purge gas) , . f) (settlement load) (maximum total and differential foundation settlement) . g) , KS B 6941： 2007 8 (momen
13、t) . , . (pipe support settlements) . 6.1.3 (liquid loading) . a) ： . (design product level) (maximum product level) 0.5 m . b) ： LNG . . 6.1.4 (wind loading) . , KS B 6283( ) . 6.1.5 (maximum product level) 1.25 . , . , 1.25 . 6.1.6 (additional loading) (decommissioning) . 6.1.7 (induced loads) 6.1
14、.7.1 (thermal loads) (tank movement) . . 6.2 (abnormal loading cases) 6.2.1 ( B ). 6.2.2 3 KS B 6941： 2007 9 . a) . b) (flying object) . (missile) . 6.2.3 (fire hazards) (heat radiation) . . (catchment) (bunded area) , (flange joint) , . (radiation heat flux) . (heat flux value) , . 1 9 % Ni 6.1 6.1
15、.1 6.1.2 6.1.2 a) 6.1.2 b) 6.1.2 c) 6.1.2 d) 6.1.2 e) 6.1.2 f) KS B 6941： 2007 10 1 ( ) 9 % Ni 6.1.2 g) 6.1.3 6.1.4 6.1.5 6.1.6 6.1.7 6.1.7.1 6.2 6.2.1 6.2.2 6.2.3 6.2.4 6.3 6.3.1 6.3.2 6.3.3 1 1 1 5 9 % Ni . . , . 2 6. . KS B 6941： 2007 11 6.2.4 LNG . . 6.2.5 . 6.3 . 6.3.1 . 6.3.2 . 6.3.3 . 7 (pres
16、sure relief) 7.1 LNG . (vapour product) . . 7.2 7.5.1 a) f) . a) 10 % b) 0.25 kPa . KS B 6941： 2007 12 7.5.1 g) h) (supplementary pressure relief capacity) . 20 % . . (multiple pressure relief valves) . . . (isolating valves) . . 7.3 . . (cold product) . 7.4 . (seat) , . 7.5 7.5.1 . a) b) LNG (rate of withdrawal, emptying rate) c) d) (suction capacity) e) (heat leakage) f) (barometric pressure variation) g) h) API 2000 . (addit
