DOT 192 & 195 PIPELINE REPAIR PRODUCTS FOR
HIGH & LOW PRESSURES, WITHOUT WELDING
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Calculate the Number of Wraps Required


We have used Barlow's formula, to compute the pressure containing ability of your pipe with its current defect and then calculate how many layers of our composite material are needed to reinforce the hoop strength of your pipe to operate it at your desired pressure.  These calculations are for estimating purposes and should not be used in place of standard engineering pipe codes or product manufacturer's requirements.


Step 1 - Calculate MAOP ( Maximum Allowable Operating Pressure )
MAOP PSI = ( ( 2 * WallThickness * SYMS ) / PipeOD ) * DesignFactor
Pipe Outside Diameter (Inches)  ** = Required Field
Original Wall Thickness (Inches) **
SMYS or Grade (e.g.: 35,000, 42,000) **
Design Factor (e.g.: .80, .72, .60, .50)
 
MAOP PSIClick "Calc MAOP PSI" to see answer
   
Step 2 - Calculate Pipe Pressure with Defect  
Defect Pressure = MAOP PSI * ( WallLoss / WallThickness )
MAOP PSI ** = Required Field
Original Wall Thickness (Inches) **
Wall Loss **  
 
Defect PressureClick "Calc Defect Pressure" to see answer
   
Step 3 - Calculate Suggested Pipe Repair Length
Suggested Length = ( 2 * 2.5 * [ SquareRoot( ( PipeOutsideDiameter * WallThickness ) /2 ) ] ) + InputLengthInches
Axial Repair Length   ** = Required Field
Original Wall Thickness (Inches) **
Pipe Outside Diameter (Inches) **
 
Suggested Axial Length (Inches)Click "Calculcate Suggested Length" to see answer
Suggested Axial Length (Feet)Click "Calculcate Suggested Length" to see answer
   
Step 4 - Calculate Square Feet of Pipe Surface
Square Feet Required = ( PipeOutsideDiameter * 3.1416 ) * ( RepairLengthInches / 144 )
Suggested Axial Length   ** = Required Field
Pipe Outside Diameter (Inches) **
 
Square Feet of Pipe SurfaceClick "Calc Square Feet" to see answer
   
Step 5 - Calculate Number of Rolls Required
Rolls Required = ( SquareFeetPipeSurface * LayersRequired ) / ( ( RollWidthInches / 12 ) * RollLengthFeet ) )
Composite Manufacturer's Required # of Layers ** = Required
Roll Width (Inches) **
Roll Length (Feet) **
Square Feet of Pipe Surface **
 
Number of Rolls using circumferential wrap techniqueClick "Calc Number of Rolls" to see answer