570 Study Guide - Annex C - Examples of Repairs

Question 1

A split-sleeve is used to repair a pipe made of A-106 gr B. Which of following is true?

A. Low hydrogen welding rods shall always be used
B. Low hydrogen welding rods shall always be used if base metal is below 50F
C. Welding is not allowed below 50F
D. The pipe should be preheated to 300F
E. No can do. Split sleeves are not allowed

Answer 1

B. Low hydrogen welding rods shall always be used if base metal is below 50F

Question 2

A full encirclement split-sleeve is used to repair piping made of A-106 gr B. The temperature is below 50F. Which type of AWS electrodes should be used?

A. E-XX10 or E-XX14
B. E-XX10 or E-XX16
C. E-XX10 or E-XX18
D. E-XX14 or E-XX16
E. E-XX14 or E-XX18
F. E-XX16 or E-XX18

Answer 2

F. E-XX16 or E-XX18

Question 3

A full encirclemnt repair sleeve is installed on a pipe. The circumferential fillet welds shall be:

A. Made with a minimum of 3 passes
B. Always welded with E-7018 electrodes
C. Started at the top of the sleeve and welded downward
D. Started at the bottom of the sleeve and welded upward
E. Started at the top of the sleeve and welded upwards. (this is called “air welding”)

Answer 3

D. Started at the bottom of the sleeve and welded upward

Question 4

A full encirclement repair sleeve is installed on a pipe. The circumferential fillet welds shall use electrodes with a diameter NOT exceeding:

A. 1/8"
B. 5/32"
C. 3/16"
D. 7/32"
E. 1/4"
F. 9/32"
G. 5/16"

Answer 4

B. 5/32”

Question 5

A full encirclement repair sleeve is installed on a pipe. The longitudinal groove weld shall use electrodes with a diameter not exceeding:

A. 1/8"
B. 5/32"
C. 3/16"
D. 7/32"
E. 1/4"
F. 9/32"
G. 5/16"

Answer 5

C. 3/16”

Question 6

The longitudinal welds on encirclement repair sleeves shall:

A. Be fused to the existing pipe wall
B. Be made with rods larger than 3/16”
C. Use a backing strip to prevent fusion with the pipe wall.
D. Be fillet-weld with a minimum of 2 passes

Answer 6

C. Use a backing strip to prevent fusion with the pipe wall

Question 7

All repairs made to on-stream piping systems must conform to:

A. API 579
B. API 580
C. API 2201
D. AWS D1. 1

Answer 7

C. API 2201

Question 8

What is the maximum size of small fillet-weld repair patch?

A. 1/2 the pipe diameter
B. 1/2 the pipe circumference
C. 6 inches
D. 12 inches
E. Unlimited

Answer 8

A. 1/2 the pipe diameter

Question 9

What is the minimum corner radius of a small fillet-weld repair patch?

A. 1/2 inch
B. 1 inch
C. 2 inches
D. 6 inches
E. Unlimited

Answer 9

B. 1 inch