Nawarat Patanakarn PateLan jv undertaking 60-70 km of work in the internal diameter range 2.3 m to 300 mm. Two Lovat 2.8 m-diameter telescopic EPB machines are designed for continuous operation, so mining carries on while 2.5 m o.d./2.3 m i.d. pipes are added to string. Average 350 m run between shafts. Arsenal of 12 assorted microtunnelling machines for small diameter connections. December 1999.
