Patent ID: 8261601
Filing Date: 2012-09-11
Classification: G01N

Abstract:
1. A method for determining corrosion in wet gas pipelines comprising: a) collecting or replicating a portion of the liquid phase from a wet gas pipeline; b) placing said portion in a high pressure, high temperature autoclave along with equivalent partial pressures of acid gases, and heating it to prepare a saturated vapor phase within said autoclave; c) transferring at least a portion of the saturated vapor to a corrosion test unit comprising a gas inlet port, a specimen holder section, one or more corrosion testing specimens arranged in said specimen holder section, a liquid collection outlet port, and a gas return line via a variable speed pump to the autoclave of b), said specimen holder section having external, temperature adjustable means; d) chilling said specimen holder section so as to cause condensation from said vapor phase onto said corrosion testing specimens; e) warming the body member of said test unit to prevent condensation independent of that on the specimens, and f) draining and withdrawing at least a portion of the vapor after subjected to condensation chilling in the corrosion test unit for return to the autoclave via the variable speed pump, g) measuring the volume of said condensation in a liquid collection and measuring unit connected at the inlet side said unit to the outlet port before returning said condensation via said pump to said autoclave, and h) calculating a value selected from the group consisting of corrosions rate, pitting of the specimen, weight loss of the specimen, and any combination thereof.