• Author / Uploaded
• Shyam Singh

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Questions 1) For a vertical with column internal dia =48” and height (T-T )=80ft, the vessel MAWP is 60psi. the vessel part MAWP for bottom dished head (2:1 ellip type ) will be a) 94.6 psi b) 82.8 psi c) 95.5 psi

d)none of above

2) What is the geometric unsharpness allowed as per code for a thickness of 2” (50.8mm) as per code? a) 0.02”

b) 0.03”

c) 0.01”

d) none of the above

3) A 1” thick plate was joined with 1-1/2” plate with a groove weld to make a tori dish to shell joint. The allowable reinforcement for the joint shall be a) ¼”

b) 3/16”

c) 5/16”

d) 1/8”

4) A 2” SA 516 grade60 material can be used for pressure vessel without impact testing up to a temperature of __________deg F a) 26 deg F b) 63 deg F c) 99 deg F d) -4 deg F 5) The length of charpy impact sample shall be a) 4”

b) 2”

c) 2.165”

d) none of the above

6) A groove weld made with 1-1/4”thickness plate with SMAW process for PQR qualification and the test were found acceptable. This PQR can be used up to a maximum weld thickness of a) 1-1/4”

b) 2.5”

c) 8”

d) none of the above

7) A pressure vessel was manufactured and ready for hydro test. The operating pressure is 90 psi. The MAWP is 100 psi. the hydro test pressure for this vessel is a) 130 psi

b) 117 psi

c) 150 psi

d) 135 psi

8) The pressure vessel was constructed with 3” thickness hemispherical head and 4-1/2”thickness shell. The material of construction is SA516 grade 70. The permissible misalignment for the circumferential seam between head and shell is a) 3/16”

b) 3/8”

c) 5/16”

d) 1/8”

9) The pressure vessel long seam (E=1) was tested for radiography with a thickness of plate 1-1/4” and the joint flush ground. The maximum slag length acceptable for this weld will be a) 0.417”

b) 0.833”

c) ¼”

d) slag cannot be accepted as E=1

10) The pressure vessel cir seam was to be taken spot radiography and the thickness was ½”. The maximum acceptable slag length for this joint will be

11) A 2” thickness vessel was having joint efficiency of 0.85 a corrosion patch was observed at 6” from weld. The joint efficiency to be considered for deciding the minimum thickness for this patch shall be a) 0.85

b) 1

c) 0.70

d) 0.90

12) The plate IQI required for 1” thickness welded plate with 1/8” reinforcement shall be a) 30

b) 12

c) 40

d) 15

13) A pressure vessel thickness is 1-1/4” and longitudinal seam for shell was radiographed ( reinforcement = 3 mm & E = 1 ). The maximum length of lack of penetration acceptable is a) 12mm

b) 24mm

c) 6mm

d) LOP is not acceptable

14) A column was hydro tested having total height of 45 feet. The top pressure gauge is reading 45 psig. The bottom pressure gauge will read approximately a) 22.5 psig b) 67.5 psig c) 45 psig

d) none of the above

15) The term “away from the weld” for recalculating the required thickness (vessel with E