Roberto Herrera
Quiz by , created more than 1 year ago

formación para el trabajo CERTIFICACION API 510 (MODULO API 510) Quiz on API 510 Math questions, created by Roberto Herrera on 02/12/2015.

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Roberto Herrera
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API 510 Math questions

Question 1 of 14

1

A pressure vessel has an MAWP of 500 psi at 400°F and is made of SA-516 Grade 70 material with a
stress value of 20,000 psi and has a measured thickness of 0.875 inches. The efficiency is 1.0, the inside
radius is 24 inches and there is no corrosion allowance. The observed corrosion rate is 0.01 inches/year
and the next planned inspection is 5 years. What will be the MAWP at the end of five years?

Select one of the following:

  • 633 psi

  • 500 psi

  • 450 psi

  • 900 psi

Explanation

Question 2 of 14

1

A pressure vessel has an MAWP of 350 psi at 300°F and is made of SA-515 Grade 60 material with a
stress value of 16,000 psi. The efficiency of the longitudinal joint is 0.70 and the inside radius is 36 inches
with a 0.125 inch corrosion allowance. The measured thickness is 0.750 inches and the corrosion ,"ate is
0.020 inches per year. The next planned inspection is in 6 years. What will be the MAWP at the end of six
years?

Select one of the following:

  • 1) 440 psi

  • 2) 350 psi

  • 3) 602 psi

  • 4) 157 psi

Explanation

Question 3 of 14

1

An eight foot diameter vessel has a large area of general corrosion (32 in. in length and width) and has
thickness readings taken in the circumferential (Iettered rows, ego 1 a, 2a, 3a,) and longitudinal (numbered rows, 1 a, 1 b, 1 c) directions as shown below. What would be the least thickness along the most critical element considering longitudinal joint?
1 a~0.298"
1 b-O.264"
1 c-O.223"
2a-O.243"
2b-O.230"
2c-O.180"
3a-O.192"
3b-O.185"
3c-O.204"
4a-O.185"
4b-O.193"
4c-O.210"
5a-O.267"
5b-O.220"
5c-O.246"

Select one of the following:

  • 1) 0.206"

  • 2) 0.193"

  • 3) 0.179"

  • 4) 0.195

Explanation

Question 4 of 14

1

A six foot diameter vessel has a large area of general corrosion (24 in. in length and width) and has had
thickness readings taken in the circumferential direction (numbered rows, ego 1 a, 1 b, 1 c) and in the
longitudinal direction (lettered rows, ego 1a, 2a, 3a,) as shown below. What would be the least thickness
along the most critical element considering the circumferential direction?
1 a-0.456
1b-O.458
1c-O.398
2a-0.443
2b-0.423
2c-O.399
3a-O.388
3b-O.334
3c-O.368
4a-0.443
4b-0.457
4c-0.447
5a-O.550
5b-O.589
5c-O.498

Select one of the following:

  • 1) 0.447 in.

  • 2) 0.363 in.

  • 3) 0.191 in.

  • 4) 0.422 in.

Explanation

Question 5 of 14

1

A pressure vessel is 48 in. in diameter. There is some widely scattered pitting present. The wall thickness including a 0.125 in. corrosion allowance is 0.750 in. One group is encircled by an eight inch diameter circle that contains the following:

One 1" dia. x 0.20" deep pit, three 3/4" dia. pits x 0.20" deep pits and, one 1-1/2" dia. x 0.15" deep pit. A straight line is drawn through the most pits within the circle and includes the 3/4",1", and 1.5" pits.

a. What is the total area of the pits within the 8 in. circle?

Select one of the following:

  • 1) 2.500 in2

  • 2) 3.876 in2

  • 3) 1.325 in2

  • 4) 7.250 in2

Explanation

Question 6 of 14

1

Problem # 5
A pressure vessel is 48 in. in diameter. There is some widely scattered pitting present. The wall thickness including a 0.125 in. corrosion allowance is 0.750 in. One group is encircled by an eight inch diameter circle that contains the following:

One 1" dia. x 0.20" deep pit, three 3/4" dia. pits x 0.20" deep pits and, one 1-1/2" dia. x 0.15" deep pit. A straight line is drawn through the most pits within the circle and includes the 3/4",1", and 1.5" pits.

b. What would have to be done to the pits in the straight line to make them acceptable?

Select one of the following:

  • 1) Nothing they are acceptable as is

  • 2) Weld repair the 1.5" dia. pit

  • 3) Fill all pits with an epoxy material

  • 4) None of the above applies

Explanation

Question 7 of 14

1

A pressure vessel is found to have a corroded area that includes the longitudinal welded seam. An evaluation must be made to determine whether the thickness al the weld or remote from the weld governs. The inside radius is 36 in., which includes a 0.125 in. corrosion allowance. The MAWP is 500 psig, S'" 17500 psi, the nameplate has no extent of radiography shown under the Code symbol stamp. The longitudinal welded sea m is Type 1. What would be the width of the band of the weld as a result of the evaluation if the width from toe to toe was 1.000 in?

Select one of the following:

  • 1) 7 in.

  • 2) 2 in.

  • 3) 3.022 in.

  • 4) 7.044 in.

Explanation

Question 8 of 14

1

There has been corrosion in the center of an ellipsoidal head. The head is a 2: 1 elliptical with a D of 60 inches and an h of 15 inches. What is the required thickness in the center portion of this head if the MAWP is 300 psi, E'" 1.0 and the S = 15600 psi ?

Select one of the following:

  • 1) 0.520 in.

  • 2) 0.750 in.

  • 3) 1.050 in.

  • 4) 0.889 in.

Explanation

Question 9 of 14

1

A torispherical head is found to have corrosion in the center portion. The crown radius is 36 inches, the MAWP is 450 psi, S '" 20,000 and UW-11(a)(5)(b) has been applied. What is the required thickness in the center portion of the head?

Select one of the following:

  • 1) 0.567 in.

  • 2) 0.405 in.

  • 3) 1.005 in.

  • 4) 2.00 in.

Explanation

Question 10 of 14

1

A pressure vessel shell has a measured thickness of 0.678 inches and a required thickness of 0.570 inches. The short term corrosion rate is 0.023 inches per year- and the long term corrosion rate is 0.015 inches per year. What is the remaining life of the shell?

Select one of the following:

  • 1) 7.200 years

  • 2) 6.000 years

  • 3) 8,123 years

  • 4) 4.695 years

Explanation

Question 11 of 14

1

The bottom head of a vessel has had the following thickness readings taken since being put into service in 1997. 1997 = 0,750",1999 = 0.720", 2000 = 0.650",2002 = 0,623", The required thickness is 0.553 in, What is the next inspection interval?

Select one of the following:

  • 1) 2.0 years

  • 2) 2,755 years

  • 3) 6.2 years

  • 4) 10 years

Explanation

Question 12 of 14

1

The following readings were taken for a pressure vessel. New in 1992 - 0.689", 1994 - 0.527", 1996- 0.500", 1998 - 0.467". What is the short term corrosion rate?

Select one of the following:

  • 1) 0,036 in./year

  • 2) 0.006 in./year

  • 3) 0,016 in./year

  • 4) 0.037 in./year

Explanation

Question 13 of 14

1

The following readings were taken for a pressure vessel. New in 1992 - 0.689", 1994 - 0.527", 1996- 0.500", 1998 - 0.467".
what is the long term corrosion rate?

Select one of the following:

  • 1) 0.037 in./year

  • 2) 0,0235 in./year

  • 3) 0.100 in./year

  • 4) 0,001 in./year

Explanation

Question 14 of 14

1

A torispherical head is to be repaired by replacement of the center portion of the head. What is the required thickness for a dished repair plate that is 50% of the head diameter, the material is SA-516 Grade 70 and S = 18,000, P = 300 psi, the crown radius is 96 in" E=0.65 and a Type 2 joint will be used.

Select one of the following:

  • 1) 2,000 in.

  • 2) 1,233 in.

  • 3) 0,556 in,

  • 4) 0.234 in.

Explanation

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