Water at 20°C flows through the elbow in Fig. P3.60 and exits to the atmosphere. The pipe diameter is D1=10 cm, while D2=3 cm. At a weight flow rate of 150 N/s, the pressure p1=2.3 atm (gage). The elbow turns 40° from the inlet direction. Neglecting the weight of water and elbow, estimate the force on the flange bolts at section 1.