Basically yes. 140C is pretty hot and if this is actually cycling from ambient to hot and then back again you'll also have significant fatigue issues and possibly ratcheting of the pipe leading to upheavel buckling. Not to mention what size anchor block you might need if someone decides they don't want some minor movement of the pipework at the inlet and outlet. Much depends on its routing, elevation changes and number of bends / straight lengths, soil type, coating, wall thickness, bend angle and radius. At 140C you also hit de-rating temperatures, not to mention potential to create steam from below ground water unless it's insulated. The operating cycles and usage will be key in this respect.
Depends on the design code how bad it can be and what you can do about it but the pipe, especially after a long straight section (3-400m) will move in the ground at the bends even if you can't see it. You may need to allow for some movement and accept some strain or have to use special backfill to allow movement without creating a void, but some careful analysis and planning is needed. Get it wrong and it will fail in service or come out of the ground, maybe not immeadiately, but in time, especially if numbe rof cycles is higher than anticipated.
Be very careful about any tee connections or small pipes coming off the main pipe as these often cuase real issues and overstress very easily.
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