Corrosion monitoring system for multiphase fluids pipelines

A method comprising:

• drawing a hydrocarbon sample of multiphase hydrocarbons flowed through a pipeline, the multiphase hydrocarbons comprising oil, gas and water, the hydrocarbon sample drawn through a first pipe fluidically coupled to the pipeline;
• flowing the hydrocarbon sample from the first pipe to a second pipe of a T-shaped pipe subassembly;
• flowing the hydrocarbon sample from the second pipe to a third pipe attached to the second pipe to form the T-shape, the third pipe comprising a first end and a second end;
• flowing a first portion of the hydrocarbon sample flowed to the third pipe to a first corrosion monitor coupled to the first end;
• flowing a second portion of the hydrocarbon sample flowed to the third pipe to a second corrosion monitor coupled to the second end, the second corrosion monitor different from the first corrosion monitor;
• analyzing, by the first corrosion monitor and the second corrosion monitor, the first portion of the hydrocarbon sample and the second portion of the hydrocarbon sample, respectively;
• and
• determining a measure of corrosion of the pipeline using a result of the analyzing by the first corrosion monitor or the second corrosion monitor.

A method comprising:

• fluidically coupling a first pipe to extend perpendicularly away from a bottom portion of a pipeline through which multiphase hydrocarbons are flowed, the multiphase hydrocarbons comprising oil, gas and water;
• fluidically coupling the first pipe to a T-shaped pipe subassembly comprising a second pipe and a third pipe attached to the second pipe to form a T-shape;
• drawing a hydrocarbon sample of the multiphase hydrocarbons into the first pipe, wherein gas in the hydrocarbon sample separates gravimetrically from oil and water in the hydrocarbon sample;
• flowing the hydrocarbon sample from the first pipe through the T-shaped pipe subassembly;
• analyzing the hydrocarbon sample using a corrosion coupon attached to one end of the third pipe and a corrosion probe attached to another end of the third pipe;
• and
• determining a level of corrosion of the pipeline based on results of analyzing the hydrocarbon sample.