**Top 21 Latest API 570 Exam Questions and Answers – ALL QUESTIONS ARE OPEN BOOK**

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**1. A 14” O.D. pipe has a corroded area on it. What is the maximum size of a small repair patch that may be used to cover the corroded area?**

**a) 3.5” **

**b) 7” **

**c) 6” **

**d) 6.5”**

**2. An NPS 4 Schedule 80 ( 0.337” wall) branch is welded into an NPS 12 Schedule 40 (.406” wall) header. What size cover fillet weld (tc) is required over the full penetration groove weld “ ( Express answer to the nearest hundredth)**

**a) 0,578” **

**b) 0.286” **

**c) 0.334” **

**d) 0.236”**

**3. A NPS 6 (6.6.25” od) seamless pipe made from ASTM A335 Grade P2 material operates at 800psi and 600 degrees F. The conditions require that a corrosion allowance of 0.125” be maintained. Calculate the minimum required thickness for these conditions.**

**a) 0.294” **

**b) 0.343” **

**c) 0.631” **

**d) 0.524”**

**4. A NPS 14 (14.00” od) seamless pipe made from ASTM A106 Grade. A material operates at 300 psi and 600 degrees F. The pipe must cross a small ditch and it must be capable of supporting itself without visible sag. A piping engineer states that the pipe must be at least 0.375” to support itself and the liquid product. He also states that a 0.125” corrosion allowance must be included. Calculate the minimum required thickness for the pipe.**

**a) 0.778” **

**b) 0.567” **

**c) 0.642” **

**d) 0.600”**

**5. A 10’ long carbon steel pipe is welded to a 10’ 18-8 stainless pipe and is heated uniformly to 475 degrees F from degrees F. Determine its total length after heating.**

**a) 20.067’ **

**b) 20.156’ **

**c) 20.234’ **

**d) 20.095’**

**6. A blank Is required between two NPS 10, 300 lb. class flanges. The maximum pressure in the system is 385 psi at 200 degrees F. A corrosion allowance of 0.175” is required. The inside diameter of the gasket surface is 9.25”. The blank is ASTM A516 Grade 70 material with no weld joint. Calculate the pressure design thickness required for the blank.**

**a) 0.789” **

**b) 0.692” **

**c) 0.556” **

**d) 0.768”**

**7. A NPS 14 (14.00” od) seamless pipe made from ASTM A53 Grade B material operates at 600psi 600 degrees F. Calculate the pressure design thickness for these conditions.**

**a) 0.243” **

**b) 0.442” **

**d) 0.205” **

**d) 0.191”**

**8. An NPS 6 piping system was installed in December 1989. The installed thickness is measured at 0.719”. The minimum thickness of the pipe is 0.456”. It was inspected in December 1994 and the measured thickness is 0.608”. An inspection in December 1995 revealed a 0.025” loss from the December 1994 inspection. On December 9. 1996, the thickness was measured to be 0.571”. What is the long-term corrosion rate of this system?**

**a) 0.01996”/year **

**b) 0.02567”1year **

**c) 0.02114” Iyear **

**d) 0.03546”/year**

**10. Using the data in Question No. 8, calculate the short-term corrosion rate in mils per year (MIP year)**

**a) 0.0012 MIP year **

**b) 0.012 MIP year **

**c) 0.12 MIP year **

**d) 12 MIP year**

**11. Using the information in Questions No. 8 and No. 9, determine the remaining life of the system, If service remains unchanged**

**a) 18 years **

**b) 5.44 years **

**c) 1.2 years **

**d) 6 years**

**12. Using the information in Question No. 10 and assuming an injection point in a Class 2 system with 7 years estimated until the next inspection what would the next interval be?**

**a) 10 years **

**b) 5 years **

**c) 3 years **

**d) 2.72 years**

**13. A seamless NPS 10 pipe, ASTM A106 Grade B material operates at 750 psi and 700 degrees F maximum. Considering only pressure design thickness, what minimum thickness is required?**

**a) 0.244” **

**b) 0.200” **

**c) 0.282” **

**d) 0.173”**

**14. A seamless NPS 16 pipe, ASTM A135 Grade A material operates at 550 psi and 600 degrees F maximum. The thickness of the pipe has been in service for 8 years. The original thickness at installation was measured to be 0.844”. Two years previous to the 0.40” measurement the thickness of the pipe was found to be 0.54”. Determine the greatest corrosion rate, i.e. short or long-term in mils per year (MIP year)**

**a) 55 MIP yea **

**b) 70 MIP year **

**c) .70 MIP year **

**d) 700 MIP year**

**15. A seamless NPS 12 pipe, ASTM A106 Grade B material operates at 750 psi and 700 degrees F maximum. The thickness of the pipe as determined by the last inspection is 0.305”. The pipe has been in service for 13 years. The original thickness at installation was measured to be 0.405”, Two years previous to the 0.305” measurement the thickness of the pipe found to be 0.316”. The next planned inspection is scheduled for 8 years. Using the appropriate corrosion rate determine what MAWP the pipe will withstand at the end of the next inspection period**

**a) 720 psi **

**b) 499 psi **

**c) 611 psi **

**d) 550 psi**

**16. A seamless NPS 6, ASTM A106 Grade A pipe operates at 300 degrees F and 765 psi. The allowable stress is 16,000 psi. Using the Barlow equation, determine the required thickness for these conditions**

**a) 0.446” **

**b) 0.332” **

**c) 0.231” **

**d) 0.158”**

**17. A seamless NPS 6, ASTM A106 Grade A pipe operates at 300 degrees F and 741 psi. The allowable stress is 16,000 psi. The owner-user specified that the pipe must have 0.125” for corrosion allowance. Using the Barlow equation, determine the required thickness for these conditions**

**a) 0.295” **

**b) 0.195” **

**c) 0.325” **

**d) 0.392”**

**18. An NPS 4 Schedule 80 (0.337” wall) branch connection is welded into an NPS 6 Schedule 40 (0.280” wall). A 0.375” reinforcing pas is used around the branch connection. The fillet weld sizes are as required by the Code. The branch connection is inserted into the header. The material of the branch and header is ASTM A672 Grade B70. What thickness would be used to determine whether heat treatment of the connection is required? (Express answer to the nearest hundredth)**

**a) 0.768” **

**b) 0.891” **

**c) 0.998” **

**d) 0.567”**

**19. An inspector finds a thin area in the body of an NPS 6, 600 lb. gate valve body. The body is made from ASTM A216 WCB material. The system operates at 900 psi and 750 degrees F. Using a corrosion allowance of 0.125”. what minimum required thickness must the valve body have to continue to safely operate? ( Round to the nearest 3 decimals)**

**a) 0.492” **

**b) 0.617” **

**c) 0.510” **

**d) 0.345”**

**20. A seamless NPS 10 pipe, ASTM A106 Grade B material, operates at 750 psi and 700 degrees F (maximum). The thickness of the pipe as determined by the last inspection is 0.30”. The pipe has been in service for 10 years. The original thickness (measured when installed) was 0.365”. Two years previous to the 0.30” measurement the thickness of the pipe was measured to be 0.31”. Determine the greatest corrosion rate i.e. short or long term.**

**a) 0.0050 inches per year **

**b) 0.0065 inches per year **

**c) 0.0100 inches per year **

**d) 0.0130 inches per**

**21. A seamless NPS 10 pipe, ASTM A106 Grade B material operates at 750 psi and 700 degrees F (maximum). The thickness of the pipe as determined by the last inspection is 0.30”. The pipe has been in service for 10 years. The original thickness (measured when installed) was 0.365”. Two years previous to the 0.30” measurement the thickness of the pipe was measured to be 0.365”. Two years previous to the 0.30”. The next planned inspection is scheduled for 7 years. Using the worst corrosion rate (short or long-term) determine what pressure the pipe will withstand at the end of its next inspection period.**

**a) 920 psi **

**b) 663 psi **

**c) 811 psi **

**d) 750 psi**

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are there mistakes in question 21

two phrases with same meaning ”Two years previous to the 0.30” measurement the thickness of the pipe was measured to be 0.365”. Two years previous to the 0.30”

may be to correct it.