45 Pressure Vessels

Question 1

Which pressure vessel RT marking designation indicates a joint efficiency of 0.85?

Answer 1

RT-3 indicates that spot radiographic inspection was performed on all longitudinal and circumferential seams, but no nozzle connection welds were radiographed.

Question 2

Which nameplate marking indicates a pressure vessel safety valve?

Answer 2

UV

Question 3

Weld type 1

Answer 3

Double welded butt joint

Question 4

Weld type 2

Answer 4

Single welded butt joint with backing strips that remain in place after the weld

Question 5

Weld type 3

Answer 5

Single welded butt joint without backing strip

Question 6

Weld type 4

Answer 6

Double full-fillet lap joint

Question 7

Weld type 5

Answer 7

Single full-fillet lap joint with plug weld

Question 8

Weld type 6

Answer 8

Single full-fillet lap joint without plug weld

Question 9

RT-1?

Answer 9

100% longitudinal and circumferential seams and nozzle welds radiographed. 1.0 joint efficiency

Question 10

RT-2

Answer 10

100% longitudinal seams radiographed and spot RT is done on circumferential seams. 1.0 joint efficiency and also considered full radiography.

Question 11

RT-4

Answer 11

Some radiography, 0.7 joint efficiency

Question 12

According to BPVC (Boiler and Pressure Vessel Code), what is the major difference between shakedown and ratcheting?

Answer 12

Shakedown results in small permanent plastic deformations that do not increase with pressure cycling (it is static). Ratcheting produces plastic deformations that increase over time (it is progressive)

Question 13

The preferred fluid for hydrostatic testing of boilers and pressure vessels is?

Answer 13

For safety, hydraulic testing uses liquids not gases. To reduce costs and avoid contaminating the pressure vessel, water is used.

Question 14

Power boilers marked with?

Answer 14

S

Question 15

Boiler assemblies marked with?

Answer 15

A

Question 16

Electric boilers marked with?

Answer 16

E

Question 17

Miniature boilers marked with?

Answer 17

M

Question 18

Pressure piping marked with?

Answer 18

PP

Question 19

Pressure valves marked with?

Answer 19

V

Question 20

Heating boilers marked with?

Answer 20

H

Question 21

Feature used to facilitate cleaning the inside of a water boiler?

Answer 21

Handhole and large manways.

Question 22

What compromises pressure vessel integrity?

Answer 22

Embrittlement, corrosion and erosion

Question 23

What is chattering?

Answer 23

Rapid opening and closing of a PRV due to some installation/valve defect. The resultant vibration may cause failure in the valve or associated piping.