3.02.operatingprocedures.non destructivetesting requirements

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3.02 WELDING PROCEDURES MANUAL of 4

OPERATINGPROCEDURES

NON-DESTRUCTIVE TESTING

REQUIREMENTS

06/17/08

HIS SECTION PROVIDES STANDARD PROCEDURES for non-destructively testing

steel welds.

GENERAL

All field welds are subject to visual inspection and/or non-destructive testing to:

Verify weld integrity

Provide for the correction of improper welding techniques when indicated byrecurring defects

Verify welder qualification in the production weld process

If upon visual inspection it is determined the weld may be defective, it must be inspected by

non-destructive means or removed from the pipeline and destructively tested. The

inspection may be made before, during, or after the weld has been completed. The

Company has the right to accept or reject any weld for any reason.


Non-destructive testing of welds may be done by:

Radiography

Magnetic particle

Liquid penetrant

Ultrasonic means

The number of welds subject to non-destructive testing will be in accordance with Table3.02.1 (“Inspection Requirements [Natural Gas]”) and Table 3.02.2 (“InspectionRequirements [Propane (LP) Line]”), respectively. Additional non-destructive testing maybe requested by the individual overseeing welding activity or the field- welding inspector.

Welds to be non-destructively tested will be selected at random from the day’s production andtested (preferred radiographically) over their entire circumference. Except for the welder whose work is isolated from the mainline construction activity, a sample of each welder’s workfor each day must be non-destructive (preferred radiographically) tested. Certain weldconfigurations cannot be radiographically tested; welds of these configurations (e.g., certainfillet welds) will be non-destructively tested using other suitable non-destructive testing meansas listed above.

T




OPERATINGPROCEDURES


REQUIREMENTS

06/17/08

TABLE 3.02.1: INSPECTION REQUIREMENTS (NATURAL GAS)

PIPE DESCRIPTION REQUIREMENTS

< 20% SMYS Visual inspection and approval of welds by aqualified welding inspector

≥ 20% SMYS

Visual inspection of welds ANDNon-destructive testing of at least:

10% of welds in Class 1 areas

15% of welds in Class 2 areas

100% of welds in Class 3 & 4 areas

100% of tie-ins

100% within railroad rights-of-way

100% within public highway rights-of-way including tunnels, bridges andoverhead road crossings

100% at crossings of major or

navigable riversEXCEPTIONS

≥ 20% SMYS but < 6 inches nominal diameter pipe

or

≥ 20% SMYS but < 40% SMYS where thewelds are so limited in number thatnondestructive testing is impractical

Visual inspection of welds by a qualified weldinginspector

CALCULATION: 20% SMYS = .20 x 2 x (yield strength) x wall thicknessOutside diameter

CALCULATION: 40% SMYS = .40 x 2 x (yield strength) x wall thicknessOutside diameter

NOTE: If the calculation result is more than the operating pressure or themaximum allowable operating pressure, the system is operating or can be operated above 20% or 40% SMYS respectively.

Example 1: Service tees welded on pipelines less than 6-inch or operating g reater than bu t equal to 20% SMYS but less than 40%SMYS need not be non-destruc tive tested if they are so limi tedin number that making non-destructive testing impractical(contact the person responsible for welding operations todetermine impracticability).

Example 2: A single 8” stopper is installed on a pipeline for thepurpose of retiring a dead end main operating greater than or equal to 20% SMYS but less than 40% SMYS need not be non-

destructi ve tested since the welds are limited in number.

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OPERATINGPROCEDURES


REQUIREMENTS

06/17/08

TABLE 3.02.2: INSPECTION REQUIREMENTS (PROPANE [LP] LINE)

TYPE OF PROPANE LINE REQUIREMENTS

Construction Visual inspection of welds AND10% NDT Inspection of welds for

each welder, each day

All railroad rights-of way; within public highwayrights-of way including tunnels, bridges, andoverhead road crossings; inside statecorporation limits; within 100 yards of waterways; public areas; high population areas

Visual inspection of welds AND100% NDT Inspection of welds

Used Pipe Visual inspection of welds AND100% NDT Inspection of welds

Tie-In’s Visual inspection of welds AND100% NDT Inspection of welds

If questions arise regarding the requirements for non-destructive test, contact the person

responsible for welding operations.

CERTIFICATION OF NON-DESTRUCTIVE EXAMINATION PERSONNEL

Persons performing non-destructive examination (NDE) of welds shall be qualified inaccordance with the "American Society of Non-Destructive Testing" (ASNT) recommendedpractice SNT-TC-1A. Only ASNT-certified levels II and III personnel shall interpret non-destructive test results.

The Company will periodically review the non-destructive testing procedures and writtenpractices of contractors providing non-destructive testing to confirm that contractorsconform to API 1104. To accomplish this, the Company should retain a current copy of thecontractor’s non-destructive testing procedures and written practices. Prior to non-destructive testing, the procedures to be used should be reviewed and agreed upon by theCompany and the contractor. The Company will require those performing non-destructive

examinations to demonstrate the proposed procedures will produced acceptable resultsand shall require those performing non-destructive to use such procedures for productiontesting

ACCEPTANCE STANDARDS

Acceptance standards as detailed in API 1104 apply to discontinuities located byradiographic, magnetic particle, liquid penetrant, and ultrasonic methods.

All non-destructive test methods are limited in the information that can be derived for theindications they produce. The Company may, therefore, reject any weld that appears tomeet the acceptance standards as defined in API 1104 if, in its opinion, the depth of adiscontinuity may be detrimental to the weld.

Refer to the following sections for more detailed information on the types of non-destructive

examinations approved:





OPERATINGPROCEDURES


REQUIREMENTS

06/17/08

3.03 Visual Inspection

3.04 Radiographic Inspection

3.05 Ultrasonic Inspection

306 Liquid Penetrant Inspection

3.07 Magnetic Particle Inspection

3.09 Ultrasonic Wall Thickness Test

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