This document contains calculations to determine the remaining life of a pipe section based on its initial thickness, last measured thickness, corrosion rates, and minimum required thickness. It finds a short-term remaining life of 2 years and long-term remaining life of 3 years based on the pipe's actual thickness of 0.28 inches, minimum thickness of 0.109 inches, and long-term and short-term corrosion rates. It also shows the calculation of minimum required thickness of 0.109 inches based on the pipe's design parameters.
This document contains calculations to determine the remaining life of a pipe section based on its initial thickness, last measured thickness, corrosion rates, and minimum required thickness. It finds a short-term remaining life of 2 years and long-term remaining life of 3 years based on the pipe's actual thickness of 0.28 inches, minimum thickness of 0.109 inches, and long-term and short-term corrosion rates. It also shows the calculation of minimum required thickness of 0.109 inches based on the pipe's design parameters.
This document contains calculations to determine the remaining life of a pipe section based on its initial thickness, last measured thickness, corrosion rates, and minimum required thickness. It finds a short-term remaining life of 2 years and long-term remaining life of 3 years based on the pipe's actual thickness of 0.28 inches, minimum thickness of 0.109 inches, and long-term and short-term corrosion rates. It also shows the calculation of minimum required thickness of 0.109 inches based on the pipe's design parameters.
This document contains calculations to determine the remaining life of a pipe section based on its initial thickness, last measured thickness, corrosion rates, and minimum required thickness. It finds a short-term remaining life of 2 years and long-term remaining life of 3 years based on the pipe's actual thickness of 0.28 inches, minimum thickness of 0.109 inches, and long-term and short-term corrosion rates. It also shows the calculation of minimum required thickness of 0.109 inches based on the pipe's design parameters.
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Unit: Equipment:
5.1.1 REMAINING LIFE CALCULATIONS PER API 570 (BASED ON UOP RETIREMENT THICKNESS) LINE SIZE 6 t initial - t last CORROSION RATE LONG TERM = time (years) between last and initial inspections
t initial = 0.44 t last = 0.28 time (yrs) 5 L.T. rate 0.032 t previous - t last CORROSION RATE SHORT TERM = time (years) between last and previous inspections
t prev. = 0.28 t last = 0.22 time = 1 S.T. rate 0.06
REMAINING LIFE (years)= t actual - t minimum
corrosion rate (CR) WHERE- t actual =The actual minimum thickness, in inches (millimeters), determined at the time of inspection as specified in 3.5 t minimum =t minimum t actual = 0.28 Inches t actual = 0.22 Inches t minimum 0.109 Inches t minimum 0.109 Inches LTCR= 0.032 Inches STCR= 0.06 Inches
ST Remaining life (yrs) 2 LT Remaining life (yrs) 3
Chemical Plant & Petroleum Refinery Piping, ANSI B31.3
Straight Pipe Under Internal Pressure, 304.1.2 t= PD/2(SE+PY) Outside Diameter of Pipe, inches P= 600 Allowable Stress, excluding quality or joint factors (E=1 if seamless pipe) D= 6.00 Coefficient from Table 304.1.1, Y=0.4 for all Ferritic Steels up to 900° F SE= 16300 Y= 0.40 inches, per ANSI B31.3, Para. 304.1.2 t= 0.109 Inspector Date September 30, 2004 Calculations based on design information provided by Koch (KNC) Beatrice, NE. Calc's do not encompass any type of loading. Calculations are based solely on pressure and temperature only. Manufactures data form (U1A) not located for all pressure equipment. Construction drawings used for design data parameters if U1A forms were unavailable.
