asme code case n-589

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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.



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)


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... . .. .. . . . .. . . . . . .. .. .. . . . .. . . . .. .. .

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CASE (continued)

N-589


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



CASE (continued)

N-589


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).



CASE (continued)

N-589


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



CASE (continued)

N-589


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



CASE (continued)

N-589


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.



CASE (continued)

N-589


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



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



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



CASE (continued)

N-589

CASES OF ASME BOll..ER AND PRESSURE VESSEL CODE



Indication-=-

Description

Airentrapmentwithinand betweenreinforcementand insidediameter

greaterthan%in.diameter

Corrective Actions

Air Bubble

(Void)

Inject or coatwith resin




Not permitted



Inject with resin-,



Inject with resin




Coat with resin




material

No repair required



CASE (continued)

N-589

CASES OF ASME BOll..ER AND PRESSURE VESSEL CODE



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




Not permitted



Inject with resin-,



Inject with resin




Coat with resin




material

No repair required

asme code case n-589

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