8/8/2019 Asme Code Case N-589
http://slidepdf.com/reader/full/asme-code-case-n-589 1/12
CASE
N-589
CASES OF ASME BOILER AND PRESSURE VESSEL CODE
Approval Date: September 24, 1999
See Numeric Index for expiration
and any reaffirmation dates.
Case N-S89
Class 3 Nonmetallic Cured-In-Place Piping
Section XI, Division 1
Inquiry: What requirements shall be applied whenmodifying buried pressure piping using reinforced .thermosetting resin Cured-In-Place Piping (CIPP)?
Reply: It is the opinion of the Committee that in
lieu of the requirements of IWA-4000, buried pressure
piping may be modified using reinforced thermosettingresin CIPP in accordance with the following require-ments.
8/8/2019 Asme Code Case N-589
http://slidepdf.com/reader/full/asme-code-case-n-589 2/12
1.01.11.21.3
2.02.1
. 2.2
2.32.42.5
2.6
3.03.13.23.33.4
4.04.14.24.3
CASE (continued)
CASES OF ASME BOILER AND PRESSURE VESSEL CODE
CONTENTS
General Requirements..................................................
Scope. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Referenced Standards and Specifications ..................................Program Requirements . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Design. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
MaterialPropertyDetermination .. .. . .. .. .. . .. . . .. .. .Design Requirements . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
DesignEquations........................................................AnalysisEquations......................................................
End Seal Requirements..................................................Curved Piping Components . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
~ation Requirements...............................................Host Pipe Examination '."""""""""'"
CarrierTube DelaminationRequirements..................................CarrierTube Wet-Out . . . . . . . . . .. . . . . . . . . . . . . . . . . . . . . . . . . .CarrierTube Insertion...................................................
Post.Insbd[ation Requirements..........................................Test Sample Retrieval. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
MaterialTesting.........................................................CIPP InstalledGeometryVerification... . .. .. . . . .. . . . . . .. .. .. . . . .. . . . .. .. .
N-589
1006.5
1006.5
1006.5
1006.5
1006.5
1006.5
1006.5
1006.5
1006.6
1006.7
1006.7
1006.7
1006.7
1006.7
1006.7
1006.7
1006.71006.7
1006.8
1006.8
8/8/2019 Asme Code Case N-589
http://slidepdf.com/reader/full/asme-code-case-n-589 3/12
CASE (continued)
N-589
CASES OF ASME BOILER AND PRESSURE VESSEL CODE
1.0 GENERAL REQUIREMENTS
1.1 Scope
The provisions of this Case do not apply to pumps, -
valves, or pressure vessels.
(a) This Case applies only to Class 3 continuously
supported buried piping systems with single-phase flowand no lateral branch connections in the area of appli-cation.
(b) This Case applies only when the host pipe has
sufficient structural capacity to carry the pressure of
the installation process and serve as a form for CIPP.
(c) This Case applies only to thermosetting resin
CJpP with reinforcing fillers.
(d) This Case applies only to host pipes with avalue for ovality, q. of 10% or less, as determined in
accordance with para. 2.3.2.
1.2 Referenced Standards and Specifications
When standards and specifications are referenced in
this Case, their revision date or indicator shall be as
shown in Appendix II.
1.3 Program Requirements
2.2 Design Requirements
2.2.1 The Owner shall specify anticipated or postu-
lated loads in the design specification for the modifi-
cations on piping system.
2.2.2 The required CIPP design wall thickness, t"
for a partially deteriorated host pipe shall be at least
the greater of the thickness determined by eqs. (1)
and (3). This minimum thickness shall be increased
to provide for all applicable manufacturing-specific in-stallation or carrier tube constructability tolerances andshall be referred to as the nominal CIPP wall thick-
ness, tn and shall be used in the analysis required by
para. 2.4.1
2.2.3 The tr for a fully deteriorated host pipe shallbe at least the greater of the thickness determined by
eqs. (1) and (2). This minimum thickness shall be
increased to provide for all applicable manufacturing-
specific installation or carrier tube constructability tol-erances and shall be referred to as tn and shall be
used in the analysis required by para. 2.4.1
2.3 Design Equations
2.3.1 Equation (I) shall be used to determine the tr
8/8/2019 Asme Code Case N-589
http://slidepdf.com/reader/full/asme-code-case-n-589 4/12
CASE (continued)
N-589
CASES OF ASME BOILER AND PRESSURE VESSEL CODE
where
q/= total external pressure on CIPP, psi
Rw = water buoyancy factor (0.67 minimum) = 1 -[0.33(HwlH)]
Hw= height of groundwater above top of host pipe, ft.H = height of soil above top of host pipe. ft.
B' = coefficientof elastic support = 1/(1 + 4e-{l.06SH).
C= ovality reduction factor =
q= ovality (%) of host pipe
(Maximum measured diameter-
Minimum measured diameter)= lOOx
Average measured diameter
NE= 2 (Design Factor)
E's= modulus of soil reaction, psi
EF= time temperature corrected flexural modulus of
(2)2.4.1 Stresses due to sustained and occasional loads
shall meet the requirements of eq. (4).
PmoDo
[
MA + MB
]
Sa /cST-+0.75; +-s;-4tn Z A 4
(4)
Where
Do= outside diameter of CIPP, in.MA = resultant moment loading on cross section due
to weight and other applicable sustained loads,
in-lb. Because CIPP is continuously supported
by theexisting soil systemorthepartiallydeteri-
orated host pipe, the MA term can usually be
neglected.
Z= section modulus of CIPP, in.3 = rm2tn
rm= mean radius of CIPP, in.tn= nominal CIPP wall thickness, in.
Pmo= maximwn operating pressure, psig
MB= resultant moment loading on cross section due
to applicable occasional loads, such as thrusts
from relief and safetyvalve loads,frompressureand flow transients, and seismic inertia, in-lb.
For seismic inertia, use only one-half of the
range.The effects of seismicdisplacementsmaybe excluded from eq. (4) if they are included
in eq. (5).
8/8/2019 Asme Code Case N-589
http://slidepdf.com/reader/full/asme-code-case-n-589 5/12
CASE (continued)
N-589
CASES OF ASME BOILER AND PRESSURE VESSEL CODE
ment effects of seismic displacements if they
were omitted from eq. (4).
S= axial loading on cross section due to seismicdisplacements, if included, and thermal expan---sion, lb.
2.4.3 Determination of Resultant Moment. For eqs.
(4) and (5), the resultant moments for straight and
curved piping members shall be calculated as follows:
where
j= A, B, or C, as defined in eqs. (4) and (5)
2.5 End Seal Requirements
2.5.1 End seals shall be installed at all beginningand terminus locations of each CIPP section to anchor
and seal CIPP to the host pipe.
2.5.2 End seal design shall be qualified by testing
to withstand all piping system loads with a minimum
safety factor of four (4). The requirements ofIWA-4000, subarticle titled "Welding and Welder
Qualification (including welding operator)," shall be
3.1.2 The host pipe shall be cleaned of loose rust,
scale, and biofouling. In addition, the host pipe shall
be free of sharp protrusions to the extent required forthe modification.
3.2 Carrier Tube Delimitation Requirements
If a permanently installed impermeable plastic mem-
brane is to be used to contain the resins during installa-tion, the Owner shall ensure that delamination of the
protective membrane will not occur. This shall be done
by testing conducted in accordance with ASTM D 903.
3.3 Carrier Tube Wet-Out
3.3.1 All host pipe preinstallation requirements shall
be completed prior to the wet-out of the carrier tube.
3.3.2 Resin and curing agent batches and mixture
proportion shall be verified. The manufacturer's rec-
ommended temperature limit for the mix shall not beexceeded.
3.3.3 The thickness and general physical conditionof the carrier tube shall be verified.
3.3.4 Inspection shall be performed to ensure thatno air voids are present in the wet-out carrier tube.
3.3.5 Proper precautions shall be taken to ensure that
8/8/2019 Asme Code Case N-589
http://slidepdf.com/reader/full/asme-code-case-n-589 6/12
CASE (continued)
N-589
CASES OF ASME BOILER AND PRESSURE VESSEL CODE
4.2 Material Testing
The samples obtained in accordance with the require-
ments of para. 4.1 shall be tested to confirm the desi,sIn
basis material property values, i.e., EF, Sr. and the
coefficient of thermal expansion used in the analysis
required by para. 2.0.
4.3 CIPP Installed Geometry Verification
4.3.1 The Owner shall verify, using ultrasonic exami-
nation in accordance with approved procedures by
qualified personnel, that the minimum installed CIPP
wall thickness meets the requirements of paras. 2.2,
2.3, and 2.4. A set of four measurements, equally
spaced around the circumference of the CIPP, shall
be taken at each end and at one intermediate point.Additional sets of measurements shall be taken in
areas of significant host pipe degradation.
4.3.2 The owner shall verify that the ovality require-
ments of para. 2.3.2 are enveloped by the CIPP as-
installed condition. The sampling requirements shall
be the same as para. 4.3.1.
4.4 System Pressure Test
A system pressure test shall be performed on the
CIPP in accordance with IWA-5244. If practicable, a
pressure loss test shall be conducted, at a test pressure
5.0 MONITORINGPLANS
5.1 Host Pipe Monitoring Plan
A plan for monitoring a partially deteriorated host
pipe's corrosion rates shall be prepared by the Owner.
No monitoring plan is required for a fully deteriorated
host pipe.
5.2 CIPP Monitoring Plan
A plan for monitoring CIPP for degradation due to
environmental conditions, erosion, or thermal expansion
and contraction shall be prepared by the Owner.
6.0 GLOSSARY
carrier tube - one or more layers of materials or a
combination of materials capable of carrying resin,
withstanding installation pressure and curing tempera-tures
Cured-In-PlacePipe (CIPP) - the buried piping modi-
fication method of inverting or winching in place a
flexible carrier tube impregnated with a thermosetting
resin into a host pipe
curing - the changing of properties of a polymeric
system by the application of heat or other means into
a more stable and usable conditionfully deteriorated host pipe - a host pipe that is not
relied upon to support soil, surcharge, or ground-water loads
8/8/2019 Asme Code Case N-589
http://slidepdf.com/reader/full/asme-code-case-n-589 7/12
CASE (continued)
N-589
CASES OF ASME BOILER AND PRESSURE VESSEL CODE
APPENDIX I
TEST PROCEDURE FOR DETERMINATION OF STRESS
INTENSIFICATION FACTOR DUE TO WRINKLES IN
CURVED PIPING COMPONENTS
1-1 GENERAL
The test procedure described in Fatigue Tests of
Piping Components,by A.R.C.Madd,l and summarized
in this Appendix, shall be used to detennine the SIF
caused by the wrinkles that may form at the intrados of
CIPP inserted through a curved host piping component.
1-1.1 Selection of Component Types for Testing
The component types selected for testing shall be
consistent with the design condition of the host pipe,
i.e., partially or fully deteriorated, and used in para. 2.3.
1-3 TEST EQUIPMENT REQUIREMENTS
The test equipment used to perform the testing de-scribed in this Appendix shall be capable of testing
full-size samples and incorporating the loading orienta-
tion and test sample anchoring methods contained in
Markl's paper.
1-4 NUMBER OF TEST SAMPLES
Thirty (30) test samples shall be fabricated in accord-ance with para. 1-2 to provide data to be used indetermination of the SIF.
8/8/2019 Asme Code Case N-589
http://slidepdf.com/reader/full/asme-code-case-n-589 8/12
CASE (continued)
N-589
CASES OF ASME BOILER AND PRESSURE VESSEL CODE
APPENDIX IIREFERENCED STANDARDS AND SPECIFICATIONS
When standards or specifications are referenced in
this Case, the applicable revision or edition of thosestandards or specifications shall be those specified inTable IWA-1600-1, except as follows:
Standard of Specification
ASTM D 638
ASTM D 696
ASTM D 790
ASTM D 903ASTM D 2105
ASTM D 2837
ASTM D 2990
Revision Date or Indicator
1904b
1991
1992
19931990
1992
1993a
8/8/2019 Asme Code Case N-589
http://slidepdf.com/reader/full/asme-code-case-n-589 9/12
CASE (continued)
N-589CASES OF ASME BOILER AND PRESSURE VESSEL CODE
APPENDIX HI
VISUAL EXAMINATION CRITERIA AND
CORRECTIVE ACTION REQIDREMENTS FOR CIPP
PRESSURE BOUNDARY
m-l GENERAL
All required cOirectiveactions to the pressure bound-
ary of CIPP due to voids, surface flaws, and areas of
improper curing shall be in accordance with this Appen-dix and Tablem-l.
m-2 SURFACEFLAW CORRECTIVEAcrIONS
m-2.1 Grind away the impermeable plastic mem-
diameter) in CIPP. The axial and circumferential spac-
ing of the injection ports shall be based on the viscos-
ity of the resin system being used.
m-3.2 The host pipe shall not be damaged while
drilling the ports in CIPP.
m-3.3 The injection method shall use gravity to ex-
pel air in the void.m-3.4 Each port shall have a means whereby either
a permanent or semi-permanent plug can be obtained
8/8/2019 Asme Code Case N-589
http://slidepdf.com/reader/full/asme-code-case-n-589 10/12
CASE (continued)
N-589
CASES OF ASME BOIT.ER AND PRESSURE VESSEL CODE
TABLE III-IVISUAL EXAMINATIONCRITERIA ANDCORRECTIVEACTIONREQUIREMENTS
FORCIPP PRESSUREBOUNDARY
Indication~~
Description Corrective Actions
Air Bubble
(Void)Air entrapment within and between
reinforcement and inside diameter
greater than % in. diameter
Inject or coatwith resin
Crack A separation of laminate, visible on
opposite surfaces, and extending
through the thickness
Not permitted
Dry Spot Area where reinforcement has not
been thoroughly wetted with resin
Inject with resin ,
Lack of Fill-Out Area where the resin has drained
from the reinforcement
Inject with resin
Pits (Pinholes) Small crater in surface, not
affecting the reinforcement and
not exceeding 10% of wallthickness
Coat with resin
Wrinkle In a laminate, an imperfection that
has the appearance of a wave,
molded into one or more plies offabric or other reinforcement
material
No repair required
8/8/2019 Asme Code Case N-589
http://slidepdf.com/reader/full/asme-code-case-n-589 11/12
CASE (continued)
N-589
CASES OF ASME BOll..ER AND PRESSURE VESSEL CODE
TABLE III-IVISUAL EXAMINATIONCRITERIA ANDCORRECTIVEACTIONREQUIREMENTS
FORCIPP PRESSUREBOUNDARY
Indication-=-
Description
Airentrapmentwithinand betweenreinforcementand insidediameter
greaterthan%in.diameter
Corrective Actions
Air Bubble
(Void)
Inject or coatwith resin
Crack A separation of laminate, visible on
opposite surfaces, and extending
through the thickness
Not permitted
Dry Spot Area where reinforcement has not
been thoroughly wetted with resin
Inject with resin-,
Lack of Fill-Out Area where the resin has drained
from the reinforcement
Inject with resin
Pits (Pinholes) Small crater in surface, not
affecting the reinforcement and
not exceeding 10% of wallthickness
Coat with resin
Wrinkle In a laminate, an imperfection that
has the appearance of a wave,
molded into one or more plies offabric or other reinforcement
material
No repair required
8/8/2019 Asme Code Case N-589
http://slidepdf.com/reader/full/asme-code-case-n-589 12/12
CASE (continued)
N-589
CASES OF ASME BOll..ER AND PRESSURE VESSEL CODE
TABLE III-IVISUAL EXAMINATIONCRITERIA ANDCORRECTIVEACTIONREQUIREMENTS
FORCIPP PRESSUREBOUNDARY
Indication.:-."
Description Corrective Actions
Air Bubble
(Void)
Air entrapment within and between
reinforcement and inside diameter
greater than % in. diameter
Inject or coat
with resin
Crack A separation of laminate, visible on
opposite surfaces, and extending
through the thickness
Not permitted
Dry Spot Area where reinforcement has not
been thoroughly wetted with resin
Inject with resin-,
Lack of Fill-Out Area where the resin has drained
from the reinforcement
Inject with resin
Pits (Pinholes) Small crater in surface, not
affecting the reinforcement and
not exceeding 10% of wallthickness
Coat with resin
Wrinkle In a laminate, an imperfection that
has the appearance of a wave,
molded into one or more plies offabric or other reinforcement
material
No repair required