API 510 Pressure Testing Procedures 5

Question 1

Under what condition may an API 510 inspector waive a pressure test entirely for a vessel that has undergone major repair?

Accepted Answer

Only with documented engineering analysis demonstrating continued fitness-for-service without testing

Answer

A major repair waiver requires documented engineering justification confirming the vessel remains fit-for-service without a pressure test.

Question 2

If a hydrostatic test reveals a leak at a threaded connection, the correct action before retesting is to:

Accepted Answer

Apply thread sealant and retighten the connection, then retest

Answer

Minor threaded connection leaks can be corrected by applying appropriate sealant and retightening before conducting a new test.

Question 3

API 510 requires that the results of each pressure test be documented. Which of the following must be recorded as a minimum?

Accepted Answer

Test pressure, test medium, hold time, temperature, and test result (pass/fail)

Answer

Complete pressure test records per API 510 must include the test pressure, medium, hold time, temperature, and the outcome of the test.

Question 4

When a vessel has an internal lining, such as a refractory or rubber lining, how does this affect pressure testing requirements?

Accepted Answer

The lining must be inspected and its condition considered before the test to avoid damage from test pressure

Answer

Internal linings can be damaged by pressure testing if they are unbonded or cracked, so their condition must be evaluated before a test is performed.

Question 5

For pressure vessels in lethal service, what additional requirement applies to pressure testing compared to non-lethal service vessels?

Accepted Answer

Full radiographic examination of all pressure joints is required in addition to the pressure test

Answer

Vessels in lethal service require full radiography of all pressure joints per ASME Section VIII Division 1, providing additional assurance beyond pressure testing alone.

(API 510) Certified Pressure Vessel Inspector Practice Test

(API 510) Certified Pressure Vessel Inspector Practice Test

API 510 Pressure Testing Procedures 5