Chapter - 9 Inspection Methods and Limitations

Question 1

Careful ,,,, inspection of every vessel is of paramount importance to determine other forms of inspection that may need to be made.

Answer 1

visual

Question 2

When any covering (Insulation) is found to be defective, a ,,, amount of the covering in the vicinity of the defect should be removed to find out whether the base metal is deteriorating and to determine the extent of the damage

Answer 2

sufficient

Question 3

Refer to API RP ,,, for additional information on CUI.

Answer 3

API RP 583 for

Question 4

Where operating deposits such as coke are normally permitted to remain on a vessel surface, it is important to determine the condition of the vessel surface behind the ,,,

Answer 4

deposits

Question 5

Magnetic flux scanning techniques are also available that provide a fast qualitative technique for the detection of corrosion losses on large surface areas for
vessels up to ,,,,, wall thickness.

Answer 5

0.5 in. (1.3 cm)

Question 6

A possible strategy for vessels with general (i.e. uniform) corrosion is to divide the vessel into its major design sections (i.e. shell, head, and nozzles) and identify at least ,,, measurement location for each design item

Answer 6

one

Question 7

In some cases, the excess thickness of the shell or head plates is used by the designer as ,,, reinforcement.

Answer 7

nozzle

Question 8

tubes need not be ,,,, or ,,, until actual perforation occurs.

Answer 8

plugged

replaced

Question 9

tubes need not be plugged or replaced until actual

,,,,, occurs.

Answer 9

perforation

Question 10

Ladders, Stairways, Platforms, and Walkways:

Visual inspection should be supplemented by ,,,, and ,,, to remove oxide scales or other corrosion products

Answer 10

hammering

scraping

Question 11

Ladders, Stairways, Platforms, and Walkways:

The tightness of bolts can be determined by ,,,with an inspector’s hammer or ,,,, or by trying the nuts with a ,,,,,

Answer 11

tapping
a small ball peen hammer
wrench.

Question 12

Ladders, Stairways, Platforms, and Walkways:

Crevices should be checked by picking at them with a ,,,,

Answer 12

pointed scraper

Question 13

Ladders, Stairways, Platforms, and Walkways:

If desired, thickness measurements of the platforms and structural members can be made with ,,,,

Answer 13

transfer calipers.

Question 14

Foundations and Supports:
Cradles are often ,,,, to vessel shells to prevent moisture from accumulating in the crevice and causing
corrosion

Answer 14

seal-welded