API 650 self-anchored tank roof drains

Impact Tests for High Alloys
Impact tests are not required for the high-alloy (austenitic stainless steel) API 650 self-anchored tank base materials, nickel alloy based materials, aluminum base materials, and weld deposited for the nonferrous (aluminum) materials. Impact tests are not required for austenitic stainless steel welds deposited by all the welding processes for services of –200°F and above. Austenitic stainless steel welds deposited for service below –200°F by all welding processes shall be impact tested in accordance with Q.6.2 except that the required impact values shall be 75% of the values as given in Q.2.2.2, Item c.

The API 650 is widely used for tanks designed to withstand low internal pressures, for the API 650 self-anchored tank storage of typical products such as crude oil, petrol, chemicals and water. We have extensive experience when it comes to API 650 tanks, varying from tanks built in the factory up to +/- 500m3, to tanks built on-location up to +/-15,000 m3.

In the event of continuous heavy rainfall, the inspection of the API 650 self-anchored tank farm should be strengthened to monitor and pay close attention to the soil moisture content of the tank farm in order to quickly take emergency measures. Check whether the seals of the oil unloading port and the oil measuring port are in good condition in time to prevent rainwater from leaking into the API 650 self-anchored tank from the oil unloading port and the oil measuring port, which will affect the oil quality.