A stream of orthoxylene coming from a 38C tank is to be heated until range 66C, for which 5 forks of 80 mm x 50 mm IPS are used, with a length 6.1 m long, whose annulus and tubes are configured in series, cooling a stream of 2268 kg/s of butyl alcohol from 77C to 60C. Determine:

a) The fouling factor (Rd)

b) These forks will be suitable for the desired service if the pressure drop allowed is 70 kPa?