CORROSERV (M) SDN BHD
COMPOSITE DESIGN REPAIR CALCULATION AS PER ISO 24817-2017
GENERAL INFORMATION
Pipe/ Repair ID
100-V-62000-11430X
Quotation ref
Repair Location/ Site Angsi
Date
Prepared by
16/6/2025
Oliver
REMARKS
PIPE/ SUBSTRATE INFORMATION
SELECT PIPE SIZE (NPS)
(Select from the list)
4
PIPE GEOMETRY
(Select from the list)
Straight
SELECT PIPE SCHEDULE
(Select from the list)
80
SELECT PIPE MATERIAL
(Select from the list)
API 5L Gr B
EXTERNAL PIPE DIAMETER (")
:
4.5
EXTERNAL PIPE DIAMETER, D (mm)
:
114.3
ORIGINAL WALL THICKNESS OF PIPE, t (mm)
:
8.56
ALLOWABLE STRESS OF THE SUBSTRATE MATERIAL, s (Mpa)
:
138
TENSILE MODULUS OF SUBSTRATE, Es (Mpa)
:
195000
THERMAL EXPANSION COEFFICIENT OF SUBSTRATE, αs (°C-1)
:
0.00001
"
Carbon Steel
DESIGN PARAMETERS/ LOADING INFORMATION
ENTER MAXIMUM DESIGN TEMPERATURE, Td (°C)
(Manually enter)
120
ENTER INSTALLATION TEMPERATURE, TI (°C)
(Manually enter)
30
REQUIRED INTERNAL DESIGN PRESSURE, P (MPa)
(Manually enter)
1.00
INSTALLATION PRESSURE, Plive (MPa)
(Manually enter)
0.00
IS THE SUBTRATE OPERATING IN CYCLIC LOADING?
(Select from the list)
No
Assume Offline Application (No Plive)
DEFECT INFORMATION
Type B - Circular
Defect
Defect Type
Type B - Circular Defect
Type B - Circumferential Slot
Type B - Axial Slot
Type A
Eqn (12)
Min from Eqn (13) & (14)
Eqn (15)
Nil
AXIAL LENGTH OF AFFECTED AREA (mm)
(Manually enter)
10
HOOP LENGTH OF AFFECTED AREA (mm)
(Manually enter)
10
ENTER MINIMUM REMAINING WALL THICKNESS, ts (mm)
(Manually enter)
0.00
TYPE A
ISO 24817
Zero (0) for Type B defects
REPAIR DESIGN CONSIDERATION
SELECT REPAIR SYSTEM
(Select from the list)
CRBX330HHA (WL)
SELECT REINFORCEMENT FIBRE USED
(Select from the list)
CRBX800
ENTER REPAIR CLASS
(Select from the list)
Class 3
ENTER LIFETIME OF REPAIR
(Manually enter)
20
MAWP, Ps (Mpa)
:
0.0
0.00
TECHNICAL DATA OF REPAIR SYSTEM
TENSILE MODULUS OF COMPOSITE IN CIRC DIRECTION, Ec (MPa)
:
25757
CRBX330HHA (WL)
TENSILE MODULUS OF COMPOSITE IN AXIAL DIRECTION, Ea (MPa)
:
14690
CRBX330HHA (WL)
POISSON'S RATIO OF THE COMPOSITE, ν
:
0.1010
CRBX330HHA (WL)
SHEAR MODULUS OF COMPOSITE, G (MPa)
:
3262
CRBX330HHA (WL)
THERMAL EXPANSION COEFFICIENT OF COMPOSITE, αc (°C-1)
:
0.0000112
THERMAL EXPANSION COEFFICIENT OF COMPOSITE, αa (°C-1)
:
0.0000169
Tg (°C)
:
249.4
UPPER TEMPERATURE LIMIT OF THE SYSTEM, Tm (°C)
:
219.4
Tm – Td
:
99.4
TEMPERATURE DE-RATING FACTOR FOR COMPOSITE LAMINATE
ALLOWABLE STRAINS, fT1
:
1.00
TEMPERATURE DE-RATING FACTOR FOR THROUGH-WALL DEFECTS
(TYPE B DEFECT) AND PERFORMANCE TEST DATA, fT2
:
1.00
SERVICE TEMPERATURE LIMIT:
TYPE A
ISO 24817
14690
Bar
ALLOWABLE STRAIN
COMPOSITE STRAIN PROPORTION
:
Ea > 0.5 Ec
Ɛc0 (mm/mm)
:
0.00250
Table 9
Ɛa0 (mm/ mm)
:
0.00250
Table 9
:
0.00010
:
0.00041
ALLOWABLE CIRCUMFERENTIAL STRAIN, εc
:
0.00240
Eqn (10)
ALLOWABLE AXIAL STRAIN, εa
:
0.00209
Eqn (10)
1.00
Eqn (3)
DESIGN BASED ON SUBSTRATE LOAD SHARING (7.5.4)
CALCULATED VALUE FOR Peq, MPa
:
0.00
1.00
1.00
CALCULATED VALUE FOR Feq, N
:
10262.16
(Eqn 4)
THICKNESS TO SUPPORT HOOP STRESS, t min,c (mm)
=
3.3
Eqn (1)
THICKNESS TO SUPPORT AXIAL STRESS, t min,a (mm)
=
2.4
Eqn (2)
LIMITED BY ALLOWABLE STRESS IN SUBSTRATE
DESIGN BASED ON REPAIR LAMINATE ALLOWABLE STRAINS (SECTION 7.5.5)
THICKNESS TO SUPPORT HOOP STRESS, t min, c (mm)
=
0.97
Eqn (8)
THICKNESS TO SUPPORT AXIAL STRESS, t min, a (mm)
=
0.83
Eqn (9)
TYPE A
ISO 24817
REPAIR DESIGN THICKNESS
INITIAL MINIMUM THICKNESS - TYPE A CALCULATION, (mm)
:
0.97
Substratre
Contribution Ignored
REPAIR METHODOLOGY
Limited by Substrate Allowable Stress
Limited by Repair Laminate Allowable Strains, Plive
Limited by Repair Laminate Allowable Strains, No Plive
Substratre Contribution Ignored
Eqn (1), (2)
Eqn (5), (6)
Eqn (7), (6)
Eqn (8), (9)
INTIAL MINIMUM THICKNESS - TYPE B (mm)
:
0.37
CYLIC LOADING DE-RATING FACTOR, f c
1
REPAIR THICKNESS INCREASE FACTOR FOR COMPLEX GEOMETRY, Fth
Straight
Bend
Pipe Branch
Flange
Reducer
:
1
(Class 3)
1
1.2
2
1.1
1.1
MINIMUM THICKNESS, tdesign(mm)
:
0.97
COMPOSITE SYSTEM
:
CRBX330HHA (WL)
THICKNESS PER PLY (MM)
:
0.70
CRBX800
CORRO-WRAP MCLP
0.7
0.53
NO OF LAYERS
:
4
Layers
THEORETICAL THICKNESS (BASED ON NO OF LAYERS) (MM)
:
2.8
:
50
l over (for Type A, Circum Slot, Axial Slot) (mm)
:
63
Eqn (18)
l over (for Circular Defect) (mm)
:
50
Eqn (19)
:
14
Final no of layer
rounded up to nearest
even number=
WRAP LENGTH
EXTENT OF REPAIR BEYOND DAMAGE REGION, l over (mm)
COMPOSITE REPAIR TAPER LENGTH, l taper (mm)
Composite Taper Ratio
5:
1
AXIAL LENGTH OF AFFECTED AREA, l defect (mm)
:
10
MINIMUM WRAP LENGTH, L = (l defect + 2l over + 2 l taper ), (mm)
:
138
TYPE A
ISO 24817
Online Leak Sealing & Rehabilitation of 4" x 2" Pipe
15/11/2022
CIRCULAR DEFECT - SECTION 7.5.7 (EQUATION 12)
REMARK
Equation 12 (Circular Defect)
Where,
[Select from the list]
Required internal design pressure, P
=
1.00
Mpa
Design lifetime
Service factor, fleak
=
=
20
0.333
Years
Is the substrate operating in cyclic loading?
De-rating factor, f c
=
=
No
1
95% lower confidence limit of energy release rate, YLCL*
Poisson's ratio for the composite laminate, v
Combined tensile modulus for the composite laminate, E ac
=
=
572
0.101
19452
J/m2*
Tensile modulus for the composite laminate, E c (Hoop)
=
25757
Mpa
=
=
=
14690
10
3262
0.369
Mpa
mm
MPa
mm
Tensile modulus for the composite laminate, E a (Axial)
Diameter (or diameter of the equivalenrt circle) of the leaking region, d
Shear modulus of the composite laminate, G
Thickness of the repair laminate, tmin
EQN 12 Circular
ISO 24817
Mpa
If yes, refer to Cyclic
Loading Calculation
sheet for De-Rating
factor, fc