I am writing to you about the pipes that you continue to install without following the instructions provided by Engitec on the process piping, today or check the pipeline from P-701 to FL-320 on the P&ID and on the arrangement drawing is indicated min.2% of slope, in these pipes is transferred the flue dust slurry. (also in this case the required slope has not been respected).It is recommended to position connecting flanges at least every 10-12 meters in case of extraordinary maintenance to the pipeline.