Page 71 - Process Equipment and Plant Design Principles and Practices by Subhabrata Ray Gargi Das

Further reading 67

2
4f o G L total
o
2
DH f;o ¼ ¼ 1:59 m
o
2gr ðDo D io Þ
Pressure drop in bends.
ð2N HP 1ÞV o 2
Annulus: DH f;o;bend ¼ 2g ¼ 0:1189 m
Inner fluid: Neglected.
Pressure drop in nozzles.
The nozzle and the pipe sizes are chosen to be the same, and hence, the flow is turbulent in the
nozzles.
2
2ðN HP ÞV i;n
¼ 1:03 m
2g
DH i;n ¼
2
2ðN HP ÞV o;n
¼ 0:1426 m
2g
DH o;n ¼
Total pressure drop.
Inner fluid (Cooling water) ¼ (1.03 þ 3.8759) 1000 9.81 ¼ 48,126.9 Pa ¼ 0.48 kg/cm 2
Annular fluid (Caustic) ¼ (0.1426 þ 0.1189 þ 1.59) 1055 9.81 ¼ 19,162 Pa ¼ 0.20 kg/cm 2
Pressure drop for both fluids being well within limit, these are not corrected for the tube wall
temperature using Eq. 3.17.
e Thus total pressure drop limits are met for both fluids.
The summary sheet in Table 3.1 can be filled with the data arrived at above. The exchanger can be
fabricated from bought out components with 150 lbs pressure rating.

References

Kern, D. Q. (1950). Process heat transfer. Tata McGraw-Hill Education.
Kern, D. Q., & Kraus, A. D. (1972). Extended surface heat transfer.

Further reading
Serth, Robert, W. (2007). Process heat transfer-principles and applications. Elsevier.