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2001. 9. 6

1. 1. (1) (1) 1

(2) (2) 2

INVESTER PROFESIONAL ORGANIZATION GOVERNMENT CODE COMMITTEE SPECIFICATION CODE LAW LICENSE PERMIT PLANT 4

2. (1) 2. (1) 8

(2) (2) 10

(3) ( ). () 20kg/ (P70, P30, P20) (1). - - - - - (1) t : (mm) = P : (kg/) D o : (mm) S : (kg/) E : (=1) T : (=1) F : (F) 0.4, (F) 0.5. ASME 31.8 841.1 STEEL PIPE DESIGN FORMULA 2-11-3( ). 11

) 20kg/ (P09) (2)(3). ( 33) t = ( + ) 2.5 0.2hK K W 100 σ f t t D o + C - - - - - (2) t = PD o 200fE + 0.8P + C -- - - - - (3) h : (m) P : (kg/) K f : ( 0.198) K t : ( 0.114) W t : (kg/) : (kg/) C : ( 0) f : (kg/mm 2 ) E : (=1) (2) (3) (h)1.5m, (W t )0.38kg/. (f) 1/4. (nominal pipe size : NPS), NPS 14. 12

t = PD i 200cosq(fh-0.006P) η θ PD i t = 200fh-0.2P η 18

t r D e + D e t r T D r e 19

(4) 1) ASME 31.8 ❿ SUSTAIN STRESS P. D 0 (i i M is ) 2 + ( I O M OS ) 2 SL = + =< 0.75 S 4t Z SL : SUSTAIN STRESS P : DESIGN PRESSURE D 0 : OUTSIDE DIAMETER OF PIPE t : PIPE THICKNESS i i, I O : STRESS INTENSIFICATION FACTOR M is, M OS : BENDING MOMENT S : SPECIFIC MINIMUM YIELDING STRENGTH ❿ OCCASIONAL STRESS SLO = SL + (i i M io ) 2 + ( I O M OO ) 2 Z =< 0.75 S SLO : OCCASIONAL STRESS 21

❿ THERMAL EXPANSION STRESS Se = Sb 2 + 4St 2 =< 0.72 S Se : THERMAL STRESS Sb : BENDING STRESS St : TORSION STRESS S : SPECIFIC MINIMUM YIELDING STRENGTH ❿ COMBINED STRESS St = SL(or SLO) + Se =< S St : COMBINED STRESS 2) 2-15-2( ),. Sa = f (1.25Sc + 0.25Sh) Sa : Sc, Sh :, f : 22

(5) (5) () 1.1.,.. 3.2.. ( ) ( Ca, Cv ).. C Rayleigh ( 1). Vo = ( ) (m/sec) Vs = ( ) (m/sec) H = (m) F = (1/sec) 1.2. a. ( i) 1% t ( ii) 30 (%) D t = () D = (). 1%. 1.3, -... Vm εg = (1) C Vm = C = (H) Vs.. R-. C λ = (3) f = Rayleigh (m) C = Rayleigh (m/sec) F = (1/sec) 23

.. λ L = (4) 4.. 1 T = (5) f. 2.,, Ca, Cv. Vm = I Sv( T, ξ) Vm = (m/sec) I = Sv = (m/sec) T = (sec) =. -. fm L εf = (7) EA fm = - (/m) L = (m) E = (/) A = () (6). fm. 1+ ks fm = µγ z πd (8) 2 = y = (/) z = (m) ks = (0.5~1.5) D = (m) - ks 1 2. 1. (Loose sand backfill) (Moderately dense sand backfill) (Dense sand backfill) (), =0.6, 0.7~0.8. 2. (Loose sand backfill) (Moderately dense sand backfill) (Dense sand backfill) 0.5 0.6 0.7 (ks), ks = 1.0.. : 1~6, 7 L,, f = g L*. p = g ( L * ) = f ( L *) (9) 0.5 1.0 1.5 24

.. λ L = (4) 4.. 1 T = (5) f. 2.,, Ca, Cv. Vm = I SvT (, ξ) Vm = (m/sec) I = Sv = (m/sec) T = (sec) =. -. fm L εf = (7) EA (6) fm = - (/m) L = (m) E = (/) A = (). fm. 1+ ks fm = µγ z πd (8) 2 = y = (/) z = (m) ks = (0.5~1.5) D = (m) - ks12. 1. ( ) 0.5 (Loose sand backfill) 0.6 (Moderately dense sand backfill) 0.7 (Dense sand backfill), =0.6, 0.7~0.8. 2. (ks) 0.5 (Loose sand backfill) 1.0 (Moderately dense sand backfill) 1.5 (Dense sand backfill), ks = 1.0.. : 1~6, 7 L,, f = g L*. p = g ( L * ) = f ( L *) (9) 1.1 2., ε p = 2.0 ε p p = p = (10) 25

1. 1.1 1%. 1.2. L T. fml' ε p = (11) 2AE fm = L = A = E =. L. 4 3εAE L' = Ω( 1+ 1) : L (12) 3 2fmΩ 1 4εgAE L' = Ω( 1+ 1) : T (13) 2 2fmΩ ε Ω = f g m Vm = ( = ) C β AE k 1+ ks = µ yz πd 2. k = k D 0 k β 0 = = 3 ( 0.6kgf / cm ) 4 k 4EI I = 26

(6) (6), 27

(7) (7). ( ) - : 1.5M - : 0.3M - :,(1M ), (1.2M ) ( ) - : 1.5M - : 1M - : 0.3M - 0.5M - - ( ) - : 4M - : 1M - : 1.2 M - : 1.5M - : 0.3M ( ) - ( ) - 30M - 2 - - 0.6M - - 29

(a) ) 30

(8) (8),. 2-26-2( ) 1..,, 50m. 2. 1.5, 5 20. 2-26-5( ) 1.. 2. 1.1 840mmH 2 0. 3. 0.2%.. 31

. ASME 31.8 TEST REQUIREMENTS FOR PIPELINE AND MAINS TO OPERATE AT HOOP STRESSES OF 30% OR MORE OF THE SPECIFIED MINIMUM YIELD STRENGTH OF THE PIPE. LOCATION CLASS 1 DIVISION 1 1 DIVISION 2 2 PERMISSIBLE PRESSURE TEST PRESCRIBED TEST FLUID MINIMUM MAXIMUM 32 MAXIMUM ALLOWABLE OPERATING PRESSURE, THE LESSER OF WATER 1.25 X mop NONE tp % 1.25 WATER AIR GAS WATER AIR 1.1 X mop 1.1 X mop 1.1 X mop 1.25 X mop 1.25 X mop NONE 1.1 X dp 1.1 X dp NONE 1.25 X dp 3 & 4 WATER 1.4 X mop NONE OR dp mop : MAXIMUM OPERATING PRESSURE dp : DESIGN PRESSURE tp : TEST PRESSURE tp % 1.1 OR dp tp % 1.25 OR dp tp % 1.4 OR dp LEAK TESTS FOR PIPELINES OR MAINS TO OPERATE AT 100 psi OR MORE ~ GAS OR AIR IS THE TEST MEDIUM. A LEAK TEST SHALL BE MADE AT A PRESSURE IN THE RANGE FROM 100psi TO THAT REQUIRED TO PRODUCE A HOOP STRESS OF THE MINIMUM SPECIFIED YIELD ~ LEAK TESTS FOR PIPELINES AND MAINS TO OPERATE AT LESS THAN 100 psi GAS MAY BE USED AS THE TEST MEDIUM AT THE MAXIMUM PRESSURE AVAILABLE IN THE DISTRIBUTION SYSTEM AT THE TIME OF THE TEST.

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