API 1102: Pipeline Crossing Railroad API 1102 – PC PISCES (Personal Computer Pipeline Soil Crossing Evaluation System) program is based on the design methodology resulting from the research and has been implemented in the program to aid pipeline designers in analyzing existing uncased pipelines and designing new uncased pipelines that…
API 1102: Pipeline Crossing Highway Introduction API 1102 – PC PISCES (Personal Computer Pipeline Soil Crossing Evaluation System) program is based on the design methodology resulting from the research and has been implemented in the program to aid pipeline designers in analyzing existing uncased pipelines and designing new uncased pipelines…
Electrical Resistance of a Conductor A conductor is any material that will allow an electrical current to flow through it. The ability of any conductor in an electrical circuit to pass current is determined by its resistance. Size of wire, corrosion, temperature, etc. can restrict the flow of electrical current…
Ohm’s Law of Corrosion Current Comparing the potential difference between an anode and cathode to the geometry factor a corrosion current can be calculated. One limiting factor is establishing the geometry factor and measurement of the anode and cathode on the small surface of a specimen. 𝐼 − Corrosion current(amps)…
Electrolyte Resistance from Surface of an Electrode to any Distance These circuits are used for measuring the resistance of solutions or gases to measure an ohmic IR drop through a material or solution. 𝑅 − Resistance to electrolyte(ohms) 𝜌 − Electrolyte resistivity(ohm⁄cm) 𝐿 − Distance through the electrolyte traveled by…
Relationship Between Resistance and Resistivity In practice electrolyte resistivity is used in corrosion related circuits and electrical resistance is in electrical circuits. 𝑅 − Electrical resistance(ohms) 𝜌 − Electrolyte resistivity(ohm⁄cm) ∆𝐿 − Distance through the electrolyte traveled by current,cm. 𝐴 − Cross sectional area through which current flows(cm2) Input Parameters…
Rate of Electrical Current Flow Through the Corrosion Cell The presence of an electrolyte and a solution between two metals or electrodes is required for galvanic corrosion to occur. Some limitations of the calculation are non-customizable size and type of the electrode and resistivity of the solution. 𝐼 − Rate…
ASME B3IG Maximum Allowable Longitudinal Extent of Corrosion The depth of a corrosion pit may be expressed as a percent of nominal wall thickness of pipe by: where 𝑑 − measured maximum depth of the corroded area(in) 𝑡 − nominal wall thickness of pipe,inches. Additional wall thickness required for concurrent…
ASME B31G Evaluation of MAOP in Corroded Areas Computation of A If the measured maximum depth of the corroded area is greater than 10 % of the nominal wall thickness, and the measured longitudinal extent of the corroded area is greater than the value determined by Equation (2), calculate: where…
Local Atmospheric Pressure This application uses the elevation to determine the local atmospheric pressure at the given elevation. Input Parameters To create a new case, click the “Add Case” button Select the Local Atmospheric Pressure application from the Pipeline Compressor module. Enter Case Name, Location, Date and any necessary…