API 650 - Section - 8 (METHODS OF EXAMINING JOINTS)

Question 1

plates shall be considered of the same thickness when the difference in their specified or design thickness does not exceed ,,,,,,

Answer 1

3 mm (1/8 in.).

Question 2

Radiographic examination is required for ,,,,,

Answer 2

shell butt-welds,
annular-plate butt-welds
flush-type connections with butt-welds

Question 3

Number and Location of Radiographs:
vertical butt joints: (plate ≤ 10 mm (3/8 in.)
-one spot radiograph shall be taken in the ,,,,,,,,,,,of completed vertical joint
-thereafter,,,,,,,,,of which shall be at intersections.
-,,,,,,,,,,,spot radiograph shall be taken in
each vertical joint in the lowest course

Answer 3

≤ 10 mm (3/8 in.)
first 3 m (10 ft)
25 %
one random

Question 4

Number and Location of Radiographs:
vertical butt joints: (plate > 10 mm (3/8 in.) and ≤ 25 mm (1 in.)
-,,,,,, spot radiograph shall be taken in the ,,,,,,,,,,,of completed vertical joint
-thereafter ,,,,,,,,of which shall be at intersections.
-,,,,,,,,,,,spot radiograph shall be taken in
each vertical joint in the lowest course, as close to bottom as is practical

Answer 4

one
first 3 m (10 ft)
100% or all
2

Question 5

Number and Location of Radiographs:
vertical butt joints: (plate > 25 mm (1 in.)
-Shall be ,,,,,, radiographe
- ,,,, junctions of vertical and horizontal shall be radiographed

Answer 5

fully

All

Question 6

Number and Location of Radiographs:
butt-weld around the periphery or insert plate:
-shall be ,,,,,,, radiographed.

Answer 6

completely

Question 7

Number and Location of Radiographs:
Horizontal butt joints:

• ,,,,,,, spot radiograph shall be taken in the first 3 m (10 ft)
• ,,,, junctions of vertical and horizontal shall be radiographed

Answer 7

One

All

Question 8

Maximum Thickness of weld Reinforcement for flush and uniform crown
≤ 13 (1/2),,,,,,,,,
> 13 (1/2) to 25 (1),,,,,,
> 25 (1)

Answer 8

1.5 (1/16)
2.5 (3/32)
3 (1/8)

Question 9

Welds examined by radiography shall be judged as acceptable or unacceptable by the standards of ,,,,,,

Answer 9

Paragraph UW-

51(b) in Section VIII of the ASME Code.

Question 10

When a section of weld is shown by a radiograph to be unacceptable under the provisions of 8.1.5 or the limits of the deficient welding are not defined by the radiograph, ,,,,,, adjacent to the section shall be examined by radiography

Answer 10

two spots

Question 11

After the structure is completed, the films shall be the property of the ,,,,,,, unless otherwise agreed
upon by the Purchaser and the Manufacturer

Answer 11

Purchaser

Question 12

Has vision (with correction, if necessary) to be able to read a ,,,,,,,, standard chart at a distance of not
less than ,,,,,,,

Answer 12

Jaeger Type 2
300 mm (12 in.

Question 13

Maximum permissible undercut is ,,,,,,,,,, in depth for

• vertical butt joints
• vertically oriented permanent attachments
• attachment welds for nozzles
• manholes
• flush-type openings
• and the inside shell-to-bottom welds

Answer 13

0.4 mm (1/64 in.)

Question 14

Maximum permissible undercut is ,,,,,,,,,, in depth for
horizontal butt joints,
horizontally oriented permanent attachments,
annular-ring butt joints,

Answer 14

0.8 mm (1/32 in.)

Question 15

The frequency of surface porosity in the weld does not exceed ,,,,,,,, in any 100 mm
(4 in.) of length, and the diameter of each cluster does not exceed

Answer 15

one cluster (one or more pores)
2.5 mm (3/32 in.)

Question 16

Maximum Thickness of weld Reinforcement for butt joint on each side of plate
≤ 13 (1/2),,,,,,,,,
> 13 (1/2) to 25 (1),,,,,,
> 25 (1)

Answer 16

• Vertical Joints
  2.5 (3/32)
  3 (1/8)
  5 (3/16)
• Horizontal Joints
  3 (1/8)
  5 (3/16)
  6 (1/4)

Question 17

All defects in areas thicker than the minimum shall be feathered to at least a ,,,,,, taper.

Answer 17

4:1

Question 18

Vaccum testing box is approximately,,,,,,,,Wide and ,,,,,,long with a ,,,,,,window on the top

Answer 18

150mm
750mm
clear

Question 19

Vacuum testing shall be performed in accordance with a ,,,,,,,prepared by the Manufacturer of
the tank

Answer 19

written procedure

Question 20

A partial vacuum of ,,,,,,,,,,,,,,,,,,, to ,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,gauge shall be used for the test.
A second partial vacuum test of ,,,,,, to shall be performed for the detection of very small leaks.

Answer 20

Partial Vacuum:
21 kPa (3 lbf/in.2, 6 in. Hg)
35 kPa (5 lbf/in.2, 10 in Hg)

2nd Partial Vacuum:
56 kPa (8 lbf/in.2, 16 in. Hg)
70 kPa (10 lbf/in.2,20 in. Hg)

Question 21

The vacuum-box test shall have at least ,,,,,overlap of previously viewed surface on each
application

Answer 21

50 mm (2 in.)

Question 22

During vacuum-box testing, The metal surface temperature limits shall be between ,,,,,,,and ,,,,

Answer 22

4 °C (40 °F)

52 °C (125 °F)

Question 23

During vacuum-box test, A minimum light intensity of,,,,,,,,, at the point of examination is required during the application of the examination and evaluation for leaks

Answer 23

1000 Lux (100 fc)

Question 24

The vacuum shall be maintained for the greater of either at least ,,,,,,,,, or the time required to view the
area under test

Answer 24

5 seconds

Question 25

As an alternate to vacuum-box testing, a suitable ,,,,,,,,,,,, can be used to test the
integrity of welded bottom joints for their entire length

Answer 25

tracer gas and compatible detector

Question 26

Tracer gas testing technique shall be capable of detecting leakage of ,,,,,,,

Answer 26

1 × 10–4 Pa m3/s (1 × 10–3 std cm3/s) or smaller.