api_510_pc_20_31_aug0505_exam_2_open

8/10/2019 API_510_PC_20_31_Aug0505_Exam_2_Open

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DAILY EXAM 2 (OPEN)

Note: Encircle the letter of only one answer which you think is most appropriate.

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

Material of Construction = SA 515 gr 60Design Pressure = 250 psigDesign temp = 580FInside Crown Radius = 72 inchesMinimum 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 = +20F, M.O.C = SA 515

gr 60 . Impact testing not performed.Required shell thickness = , dished head thk. = 1- " ( torisph. head).Determine if this material is suitable for:

a. Both shell as well as dished headb. Suitable for head but not for shellc. 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 70Design temp. = 600FAllowable 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 psic. 256 psid. None of the above


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DAILY EXAM 2 (OPEN)

4. A pressure vessel (M.O.C. 516 gr. 70) has external jacket spread over 72inches length of the shell. (Jacket pressure = 180 psi, Jacket temperature =350F) 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 withthe following data:

Design Pr = 360 psi

Design temp = 675FM.O.C = SA 537 Cl. 1Allow stress (Ambient) = 18600 psiAllow stress (675F) = 16900 psi

a. 540 psigb. 515 psig

c. 450 psigd. None of above

6. Impact test requirement for the two plates is to be assessed for MDMT = 0F,

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 = , circ seam = b. Long seam = , circ seam = 7/32c. Long seam = 7/32, circ seam = d. Long seam = 5/8, circ seam =

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

a. Materials represented by curve Ab. Materials represented by curve Bc. Materials represented by curve Cd. Materials represented by curve D


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DAILY EXAM 2 (OPEN)

9. In a pressure vessel one of the 2:1 ellipsoidal dished head is removed and anew seamless dished head of same type is installed with a single V joint withbacking strip and full radiography. What is the joint category, type and

efficiency of the joint now?

a. Category-B, Type-1 & E-0.9b. Category-B, Type-2 & E-0.9c. Category-A, Type-2 & E-1.0d. Category-B, Type-2 & E-1.0

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

a. 419 psib. 420 psic. 430 psid. 426 psi

---------------------End-----------------------

32'

54'

80'

4'

426 psi

440 psi

442.5 psi

454.64 psi

api_510_pc_20_31_aug0505_exam_2_open

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