Chilled water pipe expansion and contraction 계산

 EXPANSION & CONTRACTION CALCULATION:

                                           
v  BLACK CARBON STEEL PIPE: -     ASTM / A53 / SCH 40.
 
v  PIPING THERMAL GROWTH:-
 
1.      THERMAL GROWTH COEFFICIENT         = 0.0000125 mt / mtº c
 
2.      OPERATING TEMPERATURE                 = 5.5º C
 
3.      TEMP. AT TIME OF INSTALLATION       = 48º C
 
EXPECTED THERMAL GROWTH  (DL)     = L* δ * DT mt / mtº c
                          
v  L   =    LENGTH OF THE PIPE INSTALLED IN THE BRIDGE. (38 MTR)
v  DT=       (DIFF.BETWEEN TEMP.AT TIME OF INSTILL. --- OPERA.TEMP).
v  δ   =     THERMAL GROWTH CO-EFFICIENT (0.0000125 mt / mtº c).
  
 
EXPECTED THERMAL GROWTH (DL) = L* δ * DT mt / mtº c
 
                                                  = 38* 0.0000125* (48-5.5)
                                                                               
                                                  = 0.02019 mt / mtº c
 
                                                  = 20.19 mm / mtº c.        
  
We use victaulic coupling (flexible coupling style 077).
v  Max.available movement per style 77 flexible coupling is 6.4mm with cut grooved pipe for 10" dia.
v  Safety 25%
v  Available movement per coupling = 6.4* 0.75 = 4.8 mm.
 
ý  Number of coupling's                  = 20.19 / 4.8
 
                                                    =4.20 = 4 NOS