API 510 Question Bank (API 510 QB002)

Hie! folks,

This is the second question bank for API 510 Pressure Vessel Inspector Exam. For your information this second question bank questions are open book questions, you can refer code books during exam to answer. 

1. A standard  seamless , ASME F & D head (Torispherical) is used for the following conditions:

Material of Construction = SA 515 gr 60

Design Pressure = 250 psig 

Design temp = 580ºF

Inside Crown Radius = 72 inches 

Minimum available thk. = 1.14 inches 

Category B welds are spot radiographed.

Corrosion allowance = 0.125 inches 

Allowable stress at design temp.   = 16400 psig

Your assessment is:

a. The head does not meet code requirements.

b. The head meets the code requirements.

c. Suitability would depend on decision of pressure vessel inspector.

d. Data are not adequate.

2. A pressure vessel is to be constructed with MDMT = +20°F, M.O.C = SA 515 gr 60 . Impact testing not performed.

Required shell thickness = ¾ , dished head thk. =  1-⅛ " ( torisph. head). Determine if this material is suitable for:

a. Both shell as well as dished head

b. Suitable for head but not for shell

c. Suitable for shell only but not for head

d. Not suitable for either

3. For a certain pressure vessel with spot radiography, and all Welds  type 1, 

Vessel diameter =  72 inch I.D.  

M.O. C = SA 515 gr 70 

Design temp. = 600°F 

Allowable stress at design temp. = 20,000 psi  

If shell thk. = 5/8" and C. A = 1/8", the MAWP for the shell will be:

a. 234 psi

b. 168 psi

c. 256 psi 

d. None of the above

4. A pressure vessel (M.O.C. 516 gr. 70) has external jacket spread over 72 inches length of the shell. (Jacket pressure = 180 psi, Jacket temperature = 350°F) the vessel OD = 36 inches. Shell thickness= 0.5 inch, C.A. = Nil.  Decide which of the following are applicable in the present case.

a. Shell thickness is OK.

b. Shell thickness is NOT OK.

c. Data are not adequate.

d. Acceptance of shell thickness depends on opinion of vessel engineer.

5. Choose correct hydrostatic test pressure from given options for a vessel   with the following data:

Design Pr = 360 psi

Design temp = 675ºF

M.O.C = SA 537 Cl. 1

Allow stress (Ambient) = 18600 psi

Allow stress (675°F) = 16900 psi

a. 540 psig 

b. 515 psig

c. 450 psig

d. None of above

6. Impact test requirement for the two plates is to be assessed for MDMT = 0ºF, to be used for Vessel which will be hydrotested and used for steady operation. 

Plate A. Plates 537 class 1,    2.0 inch thick 

Plate B. Plates 515 gr 60,      0.75 inch thick 

Your assessment is:

a. Plate (A) and plate (B) both require impact test.

b. Only (A) requires, (B) is exempt.

c. Only (B) requires, (A) is exempt.

d. Both do not require impact testing.

7. For vessel shell, thk= 4.0 inch, max. weld mismatch shall be as follows:

a. Long seam = ¼”, circ seam = ½”

b. Long seam = ¼”, circ seam = 7/32”

c. Long seam = 7/32”, circ seam = ¼”

d. Long seam = 5/8”, circ seam = ½”

8. Toughness (opposite of brittleness) will be best for which materials:

a. Materials represented by curve A

b. Materials represented by curve B

c. Materials represented by curve C

d. Materials represented by curve D

9. In a pressure vessel one of the 2:1 ellipsoidal dished head is removed and a new seamless dished head of same type is installed with a single ‘V’ joint with backing strip and full radiography. What is the joint category, type and efficiency of the joint now?

a. Category-B,  Type-1 &  E-0.9

b. Category-B,  Type-2 &  E-0.9

c. Category-A,  Type-2 &  E-1.0

d. Category-B,  Type-2 &  E-1.0

10. A pressure vessel of overall height 80’ has its part MAWP at various parts as detailed in the sketch. What is the vessel MAWP (hydrostatic head 1’ = 0.433 psi)?

a. 419 psi

b. 420 psi

c. 430 psi

d. 426 psi 

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