In the case of turbines with high steam temperatures our erection drawing indicates where foundation lagging is recommended.After completion or repairs, the steam lines must be carefully cleaned and blown out with high-velocity steam.The temperature of the steam used must be varied during the process. Final cleanliness of the line is checked by holding a copper sheet in front of the outlet from the blow-out line.There must be no appreciable marks made on the sheet by particles being ejected from the pipe.If the ambient temperature of a turbine can fall below 0°C the following lines should be provided with trace heating:-Lines which may freeze (e.g. drain lines, measuring lines).-Oil lines in which the oil may become too sluggish (e.g. control oil lines).Trace heating systems are not included in our scope of delivery. The should be suited to local conditions.