초록 ▼

The described invention relates to a method for determining corrosion in wet gas pipelines comprising: a) using a portion of the liquid phase from a wet gas pipeline; b) placing said portion in a high pressure, high temperature autoclave to prepare a saturated vapor phase; c) transferring the satura

The described invention relates to a method for determining corrosion in wet gas pipelines comprising: a) using a portion of the liquid phase from a wet gas pipeline; b) placing said portion in a high pressure, high temperature autoclave to prepare a saturated vapor phase; c) transferring the saturated vapor to a corrosion test unit, said unit having a specimen holder section having external, temperature adjustable means, and specimens being arranged in one or more positions within the specimen holder; d) chilling said specimen holder section so as to cause condensation onto said corrosion testing specimens; and, e) calculating a value selected from the group consisting of corrosions rate, pitting of the specimen, weight loss of the specimen, and any combination thereof. The invention process can be practiced in a separate laboratory apparatus designed to accomplish the above method, or in a similar online apparatus set up in a semi-batch mode or continuous mode.

대표청구항 ▼

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 pr

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, andf) 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, andh) calculating a value selected from the group consisting of corrosions rate, pitting of the specimen, weight loss of the specimen, and any combination thereof. 2. The method of claim 1 wherein the specimen holder is configured to allow specimens to be inserted in different orientations that simulate a portion of the pipeline selected from the group consisting of a top portion of the pipeline, a side portion of the pipeline, a bottom portion of the pipeline, and any combination thereof. 3. The method of claim 2 comprising arranging said specimens in a triangular specimen holder section. 4. The method of claim 1, further comprising using a shaped carbon steel flow element as a single corrosion testing specimen. 5. The method of claim 1, further comprising the step of periodically halting the flow of vapor from the autoclave to the corrosion testing unit, and measuring said corrosion testing plates for calculating the one or more values of step e), and replacing with new specimens or specimen section as needed. 6. The method of claim 1 wherein said external, temperature adjustable means comprises a chilled coolant line. 7. A method for determining corrosion in wet gas pipelines comprising the steps of: a) collecting a portion of the vapor phase from a wet gas pipeline,b) transferring at least a portion of the vapor phase collected in a) to a corrosion test unit comprising an gas inlet port, a specimen holder section, one or more corrosion testing specimens arranged in said specimen holder section, a liquid collection outlet port, said specimen holder section having external, temperature adjustable means, wherein the inlet side of the liquid collection and measuring unit is connected to the liquid collection outlet port,c) chilling said specimen holder section so as to cause condensation from said vapor phase onto said corrosion testing specimens,d) warming the body member of said test unit to prevent condensation independent of that on the specimens, ande) withdrawing from said corrosion test unit at least a portion of the vapor phase after the vapor phase is subjected to condensation chilling for return to an autoclave,f) draining and withdrawing said condensation via said liquid collection outlet port,g) measuring the volume of said condensation m a liquid collection and measuring unit,h) returning said condensation via a pump to the autoclave, andi) halting periodically the flow of vapor from the pipeline to the corrosion testing unit, and inspecting said corrosion testing plates, replacing with new specimens or specimen section as needed. 8. The method of claim 7, additionally comprising using a variable speed pump to transfer or assist transfer the vapor phase from the corrosion test unit in step e). 9. The method of claim 7, wherein said external, temperature adjustable means comprises a chilled coolant line. 10. An apparatus suitable for determining corrosion in wet gas pipelines comprising: a) a high pressure, high temperature autoclave;b) a corrosion test unit comprising a gas inlet port, a specimen older section, a plurality of corrosion testing specimens affixed on said specimen older section, a liquid collection outlet port, and a gas return line to the autoclave a), said specimen holder section having external, temperature adjustable means, and a warming element placed around or at least partially around the main body of the corrosion test unit;c) a liquid collection and measuring unit, the inlet side of the collection and measuring unit connected to the liquid outlet port in the corrosion test unit b) and at the outlet side to a variable speed pump. 11. The apparatus of claim 10, wherein said external, temperature adjustable means comprises a chilled coolant line. 12. The apparatus of claim 10, wherein said apparatus is adapted for continuous employment by installation on a wet gas pipeline which pipeline replaces the autoclave a). 13. The apparatus of claim 12 additionally comprising a warming element placed around or at least partially around the main body of the corrosion test unit. 14. An apparatus suitable for determining corrosion in wet gas pipelines comprising: a) a high pressure, high temperature autoclave;b) a corrosion test unit comprising a gas inlet port, a specimen holder section, a plurality of corrosion testing specimens affixed on said specimen holder section, a liquid collection outlet port, and a gas return line to the autoclave a), said specimen holder section having external, temperature adjustable meansc) a warming element placed around or at least partially around the main body of the corrosion test unit, wherein the warming element and test section are insulated. 15. The apparatus of claim 14, additionally comprising a liquid collection and measuring unit connected at the liquid outlet port in the corrosion test unit b). 16. An apparatus suitable for determining corrosion in a wet gas pipeline comprising: a) a corrosion test unit comprising a gas inlet port, a specimen holder section, a plurality of corrosion testing specimens affixed on said specimen holder section, a liquid collection outlet port, and a gas return line to the wet gas pipeline, said specimen holder section having external, temperature adjustable means, wherein said apparatus is installed on the wet gas pipeline, and a variable speed pump is installed for the purpose of transporting or assisting returning the uncondensed gas vapor to the pipeline. 17. An apparatus suitable for determining corrosion in a wet gas pipeline comprising: a) a corrosion test unit comprising a gas inlet port, a specimen holder section, a plurality of corrosion testing specimens affixed on said specimen holder section, a liquid collection outlet port, and a gas return line to the wet gas pipeline, said specimen holder section having external, temperature adjustable means, andb) a warming element placed around or at least partially around the main body of the corrosion test unit, where the warming element and test section are insulated wherein said apparatus is adapted for continuous employment by installation on a wet gas pipeline.