Rusty pipes Iron in Product Measurement Lab error Calculation mproper caloration Analyst Materials Solvent contamination in lab An Supplier DBT Raw materials Supplier Truck City Plant Methods \Supplier 1 AKW-2 \system Supplier 2 Lab solvent contamination In lab Supplier Analytical procedure Calibration Not followed Sampling tron tools Dirty botles, At sample point reactor Heat exchanger leak E470 Rust near sample point Exposed pipe Tools Inexperienced analyst Maintenance Iron tools Opening Enes Exchangers Manpower /E47 Materials of construction Reactors /13 Pumps Pipes Machines Environment E583