Evaluating black powder formation of hydrocarbon gas flowed through pipelines

A method comprising:

• flowing sales gas output from a glycol dehydration unit in a gas plant into a sales gas pipeline;
• receiving, by operation of data processing apparatus, one or more operational parameters of the glycol dehydration unit in the gas plant;
• determining, by operation of the data processing apparatus, one or both of an amount of glycol carryover and an amount of water carryover in sales gas output from the glycol dehydration unit in the gas plant based on the one or more operational parameters of the glycol dehydration unit;
• determining, by operation of the data processing apparatus, an amount of glycol and water co-condensation in the sales gas pipeline based on one or more operational parameters of the sales gas pipeline and the one or both of the amount of glycol carryover and the amount of water carryover;
• and
• determining, by operation of the data processing apparatus, an amount of black powder formation of the sales gas based on the amount of glycol and water co-condensation.