The difference arises because the API 5L formula includes a standardized conversion factor (0.02466) that accounts for manufacturing tolerances, pipe ovality, and other factors. In contrast, calculating weight using density (7850 kg/m³) assumes an ideal solid material without considering these...
The percentage of welds to inspect depends on your project requirements and past issues. Based on API 650:
Liquid Penetrant Testing (PT): Typically 10–20% for non-critical welds and 100% for critical areas.
Ultrasonic Testing (UT): 100% for critical welds; spot checks (10–20%) for others...
Yes, you are correct. The CSA Z662 standard, which governs oil and gas pipeline systems in Canada, includes references to various testing methods for materials, including fracture toughness and drop-weight tear testing (DWTT). While CSA does not have a document that is entirely equivalent to API...
Hello,
If the requested X70 API 5L pipe dimensions (18" x 92mm) are outside the permissible limits in Table 9 (e.g., maximum WT for this OD is 45mm), here’s how you can proceed:
Deviation Agreement: If the client insists on the dimensions, both parties can agree to a deviation, but this must be...
Good morning!
Here are clear steps for each valve test you mentioned:
1. Low-Pressure Closure Test
Objective: Checks for leakage at low pressure.
Procedure:
Close the valve.
Apply the required low-pressure test fluid (usually air or water) to one side of the valve.
Check for leakage on the...
