An AWS Educational Institution

Transmission And Distribution "Hands On Visual  Test" (CPWI+V)


A welding inspection course for Pipeline Construction and In-Service welding leading to a Pipeline Welding Inspector’s certificate, (CPWI+V).


Welding Inspection for Transmission and Distribution Pipelines "Hands-On" (CPWI+V)™ originated by Mr. John Wormeli who had over 40 years of welding engineering and non-destructive testing experience on pipelines, pressure vessels and piping systems. John graduated from LeTourneau, Longview, Texas, with a Bachelor of Science degree in Welding Engineering. He worked for ACF Industries for 5 years and Atlantic Richfield for 13 years, prior to forming the National Welding Inspection School and his consulting business.



This course is now taught by Mr. Mark Hodgson who has many years of experience in the industry. Mr. Hodgson had the chance to meet Mr. John Wormeli while working on a project for Pacific Gas & Electric. The team consisting of Mr. Hodgson and Mr. Wormeli were developing updated welding procedures for Pacific Gas & Electric. Little did Mark know, Mr. Wormeli was interviewing Mark to continue what he had started in 1977 and asked Mark to begin teaching the CPWI+ program. Mark is now sharing his considerable knowledge and experience by conducting this CPWI+V program.


This program presents the codes and standards used in the construction of pipelines and distribution systems in the oil and gas industry. Successful completion of this seminar leads to a Certificate for Pipeline Welding Inspection (CPWI+V) from the National Welding Inspection School. Successful completion includes a passing score of 75% or greater  examination. A calculator will be required for this program.


NO video or audio recording devices are allowed during our "Hands-On" CPWI+V™ course without the expressed written consent of NWIS. Thank you for your cooperation.


Course Curriculum


The applicable editions of the following codes and standards presented in the program are listed:


API 1104, Welding of Pipelines and Related Facilities

Appendix B, API 1104, In-Service Welding

ASME B31.4, Liquid Transportation Systems for Hydrocarbons

ASME B31.8, Gas Transmission and Distribution Systems

API 5L, Specification for Line Pipe

DOT Part 192, Transportation of Natural and Other Gas by Pipeline

DOT Part 195, Transportation of Hazardous Liquids by Pipeline

Specifications for Electrodes and Filler Metals


Additional topics presented in this program include:


Preparation of Welding Procedures

Welder Qualification

Visual Welding Inspection

Pipe Inspection

Weld Joint Designs

Preheat Considerations

Electrode Selection

Weld Passes and effect on Properties

Removal of Arc Burns

Weld Repair Techniques

Weld Toughness (CVN Testing)

Weld and Heat-Affected Zone Hardness

Formulas for Welding Inspection

Weld Defects and Causes

Effect of Magnetism on Weld Quality

Measurement of Welding Parameters


The first day begins with an introduction and scope of the 4 day seminar plus 1 day test. Definitions of pipeline terminology and mechanical testing activities are presented. A detailed presentation of API 1104 including welding procedure development, welder qualification, visual inspection criteria and related topics are covered this first full day.


The second day includes detailed presentations of ASME B31.4 and ASME B31.8, for Liquid and Gas Pipelines respectively. In-Service Welding is presented in depth to assure all attendees are aware of the need for safe and proper procedures when welding on loaded, pressurized pipelines. The details of Appendix B, API 1104, including the proper method for welding procedure development and welder qualification are discussed.


Also covered on this second day is the “Inspection of Pipe” using API 5L as the foundation for the acceptance criteria. Inspection items which will be covered for the welding inspector are the dimensional tolerances and the inspection tools used to determine compliance to the pipe manufacturing tolerances.


The effect of magnetism on pipe ends in relation to welding of the root pass will be covered and shown on PowerPoint slides and weld cross-sections. The carbon equivalent of the pipe is discussed in the context of potential hardness and possible cracking. Preheat requirements are discussed in the event the carbon equivalent is higher than industry accepted values.


Welding electrode selection and the electrode classification system is presented this second day to provide the attendees with the reasons for selecting the electrodes and/or filler metals for the procedure which will assure the deposited weld metal strength meets or exceeds the strength requirements of the pipe material. Other properties such as impact strength (CVN testing) and the very important hardness values of the weld and HAZ are discussed for both new construction and In-Service welds.


Weld Defects and Related cross-sections are presented on the second day also to assist in learning the specific pipeline weld defects and causes for these defects.


The fourth day will be an all "Hands-On" learning experience in the shop. Everything learned and discussed in the classroom the previous two days will be used by the attendee in the open shop. The attendee will be required to measure and inspect various pipe welds and diameters along with actual welding with each of the welding processes in the welding booths. A list of just a few of the items which must be completed by each attendee is presented below. It is expected that the entire day will be necessary to complete the "Hands-On" training program.


Fourth Day




1) Inspect  pipe welds  to determine Visual Defect/s (if any) on O.D. and I.D. The measurement tools including a Dial Caliper and tape measure will be furnished at each pipe sample location within the shop.


2) Measure the 24" pipe to determine the precise diameter at the pipe end using a "PI" (Diameter) tape. The "PI" tape will be provided at the pipe location in the shop.


3) Measure the Wall Thickness of the 24" Pipe to three decimal places at four locations at the marked end using the Ultrasonic Thickness Gage . The UT Gage will be provided.


4) Measure the Gauss Level (magnetic field strength) on the designated pipe using the F.W. Bell Gaussmeter.Determine the gauss level at 12,3,6 and 9 O' clock positions. The gaussmeter will be provided.


5) Measure the Amperage and Voltage during welding in the test booth using the Fluke Amp/Volt meters. Record the welding parameters on the form provided. These meters will be provided.


6) Calculate the travel Speed in Inches per Minute (IPM) of the welding in the test booth. A tape measure, stop watch, and calculator will be provided.


7) Calculate the Heat Input (in Joules per Inch) for the welding being done in the test booth. A calculator, ammeter, voltmeter, tape measure and stop watch will be provided.


8) Measure the Tensile specimens for width and thickness and calculate the area of each of four specimens. The specimens, the dial calculator and the calculator will be furnished.


9) Conduct  Tensile Tests and calculate the Ultimate Tensile Strength of each specimen and, based on the given Pipe Grade (X42,X52,X60,X70), determine if the specimen is acceptable or if it failed according to API 1104. The specimens will be marked for each test. The calculator will be furnished.


10) Conduct  Bend Tests, one Root Bend and one Face Bend, and one Nick Break Test and determine their acceptance or failure in accordance with API 1104.


11)  Arc Burn will be demonstrated  by grinding and by using ammonium persulfate in accordance with ASME 31.8 and DOT requirements.




Fifth Day (Half-Day)


The "CPWI+V"  test will be administered in the classroom  at 7:00 am-1:00 pm. The written test, along with the  Hands on Visual Test, will be administered at NWIS Training Inc facility. Upon completion and passing the course  a certificate, a laminated certification card, and letter of attendance, with a unique registration number, is issued to all attendees who have passed the exam. You will be notified by mail in 7-10 days of your results.


The test time will be 6 hours.  A composite score of 75% is required for passing. 60% of the students test score will be from the wrtten portion of the test and 40% of the test score will be from the hands on visual portion of the test.


Must be 18 years old and  have industry knowledge

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NWIS Training, Inc.

16380 Hwy 290 W

Burton, TX 77835

(979) 289-9000

Business Hours

Monday - Thursday  8:00 - 4:00

Friday  8:00 - 12:00