At 1t/d PSU, coal slurry was liquefied with hydrogen at over 723K in nearly 200 atm. So, the equipments were damaged with these surroundings. To predict the task of plant maintenance in pilot plant, and also to obtain the direction of the process design of scale up equipment in demonstration plant and commercial plant, the equipment damages at 1t/d PSU were evaluated. As the results, the damage caused with the surroundings above was often occurred. However, the damage caused by its material property was less occurred than former.
