API 510 - Section - 7

Question 1

Corrosion rate is determined by the ,,,,

Answer 1

difference between two thickness readings divided by the time interval between the readings.

Question 2

Short-term (ST)corrosion rates are typically determined by the,,,,,, thickness readings

Answer 2

two most recent

Question 3

Long-term(LT) rates use the ,,,,reading and ,,,,, taken earlier in the life of the equipment

Answer 3

most recent

one

Question 4

For a new vessel or for a vessel for which service conditions are being changed, one of the following methods shall be used to determine the vessel’s probable corrosion rate

Answer 4

• Vessels operating in the same or similar service
• Estimated by a corrosion specialist.
• Published data on vessels in same or similar service
• On-stream inspection approximately 3 to 6 months of service

Question 5

A ,,,,, analysis may be used in the corrosion rate and remaining life calculations for the pressure vessel

Answer 5

statistical

Question 6

This ,,, approach may be applied for assessment of substituting an internal inspection or for determining the internal inspection interval

Answer 6

statistical

Question 7

Statistical analysis may not be applicable to vessels with ,,,,

Answer 7

random but significant localized corrosion

Question 8

The MAWP for the continued use of a pressure vessel shall be based on computations that are determined
using the ,,,, or the ,,,,, to which the vessel was built

Answer 8

• Latest applicable edition of the ASME Code

- Construction code

Question 9

The thickness measurement procedure shall be

approved by the ,,,,,

Answer 9

inspector

Question 10

Evaluation of Locally Thinned Areas:
For a corroded area of considerable size the wall thicknesses may be averaged over a length not exceeding vessels with inside diameters less than or equal to 60 in (150 cm),,,,,,,,which ever is less

Answer 10

one-half the vessel diameter or 20 in. (50 cm),

Question 11

Evaluation of Locally Thinned Areas:
For a corroded area of considerable size the wall thicknesses may be averaged over a length not exceeding vessels with inside diameters greater than 60 in. (150 cm), ,.,,,,,,,,which ever is less

Answer 11

one-third the vessel diameter or 40 in. (100 cm)

Question 12

The following criteria must be met in order to use thickness averaging:
1-the equipment does not operate in the ,,,,
2-the component is not in ,,,, service
3-a minimum of ,,,,thickness readings should be included in the data set
4-
5-lowest individual reading cannot be,,,,,

Answer 12

creep range
cyclic
15
less than 50 % of “t” required

Question 13

If circumferential stresses govern (typical for most vessels), the thickness readings are taken along a
,,,,, length

Answer 13

longitudinal

Question 14

If longitudinal stresses govern (because of wind loads, saddle support in horizontal vessels, or other factors), the thickness readings are taken along a ,,,, length (an arc).

Answer 14

circumferential

Question 15

when thickness averaging near structural discontinuities (e.g. a nozzle, conical section transition, and flange connection), the limits for thickness averaging shall be considered ,,,, for the reinforcement window area

Answer 15

separately

Question 16

When performing remaining life calculations in 7.2, the ,,,, average of any length in the corroded area is
substituted for tactual

Answer 16

lowest

Question 17

During the current inspection, ,,,,,, pits may be ignored

Answer 17

widely scattered

Question 18

Evaluation of Pitting:

• widely scattered pits may be ignored, if remaining thickness below the pit is ,,,,,
• total area of the pitting that is deeper than the corrosion allowance does not exceed,,,,,
• the sum of the pit dimensions that is deeper than the corrosion allowance along any straight 8-in. (20-cm) line does not exceed ,,,,

Answer 18

• > 1/2 “t”required
• 7 in.2 (45 cm2) within any8-in. (20-cm) diameter circle
• 2 in. (5 cm).

Question 19

Evaluation of Pitting:
An alternative to the procedures for components with thinning below the required thickness may be evaluated by employing the design by analysis methods of either ,,,,,,,,,, or ,,,,

Answer 19

ASME Code, Section VIII, Division 2 Appendix 4

API 579-1/ASME FFS-1, Annex B-1

Question 20

Joint Efficiency Adjustments:
When the vessel surface away from a weld is corroded and the joint efficiency is less than 1.0, an independent
calculation using the appropriate weld joint factor ,,,, can be made

Answer 20

(typically 1.0)

Question 21

Joint Efficiency Adjustments:
For this joint efficiency calculation, the surface at a
weld includes ,,,, on either side of the weld (measured from the toe) or ,,, on either side of the weld, whichever is greater

Answer 21

1 in. (2.5 cm)

twice the required thickness

Question 22

Corroded Areas in Vessel Heads:

In the central portion of the head, use the ,,,, head formula in the construction code

Answer 22

hemispherical

Question 23

Corroded Areas in Vessel Heads:

The central portion of the head is defined as the center of the head with a diameter equal to ,,,, of the shell diameter

Answer 23

80 %

Question 24

Corroded Areas in Vessel Heads:
For torispherical heads, the radius to use in the hemispherical head formula is the ,,,,, (equal to the outside diameter of the shell for standard torispherical heads, though other radii have been permitted)

Answer 24

crown radius

Question 25

Corroded Areas in Vessel Heads:
For ellipsoidal heads, the radius to use in the hemispherical head formula shall be the equivalent,,,,,,, where D is the shell diameter (equal to the inside diameter) and K1 is given in Table 7.1

Answer 25

spherical radius K1 × D

Question 26

Corroded Areas in Vessel Heads:

For many ellipsoidal heads, D/2h = ,,,,,

Answer 26

2.0

Question 27

FFS Evaluations:

To evaluate metal loss in excess of the corrosion allowance,,,,,,,as applicable

Answer 27

API 579-1/ASME FFS-1, Parts 4, 5, or 6

Question 28

FFS Evaluations:

To evaluate blisters, HIC/SOHIC damage, and laminations,,,,,

Answer 28

API 579-1/ASME FFS-1, Part 7 and Part 13,

Question 29

FFS Evaluations:

To evaluate weld misalignment and shell distortions,,,,,

Answer 29

API 579-1/ASME FFS-1, Part 8

Question 30

FFS Evaluations:

To evaluate crack-like flaws,

Answer 30

API 579-1/ASME FFS-1, Part 9

Question 31

FFS Evaluations:

To evaluate potential creep damage on components operating in the creep regime

Answer 31

API 579-1/ASME FFS-1, Part 10

Question 32

FFS Evaluations:

To evaluate the effects of fire damage

Answer 32

API 579-1/ASME FFS-1, Part 11

Question 33

FFS Evaluations:

To evaluate dent and gouge damage on components

Answer 33

API 579-1/ASME FFS-1, Part 12

Question 34

Current ASME code design stress value factor is,,,

Answer 34

3.5

Question 35

Earlier ( Pre-1999) ASME code design stress value factor is,,,

Answer 35

4.0 or 5.0

Question 36

When the extent of radiography originally performed is not known, use joint efficiency of
,,,,,for Type No. (1)
,,,,, for Type No. (2) butt welds
,,,,,, for seamless shells, heads, and nozzles

Answer 36

• 0.7
• 0.65
• 0.85

Question 37

Reports & Records:

Permanent records will be maintained ,,,,,,, of each equipment item;

Answer 37

throughout the service life

Question 38

Reports & Records:
Pressure vessel and pressure-relieving device records shall contain four types of information pertinent to
mechanical integrity

Answer 38

1- Construction and design information
2- Inspection history.
3- Repair, alteration, and rerating information
4- FFS assessment documentation requirements