What Is API 650?
API 650 is used for:
atmospheric storage tanks
large oil storage tanks
standard temperature conditions
What Is API 620?
API 620 is designed for:
low-pressure tanks
cryogenic storage
liquefied gases
Key Differences
Pressure
API 650 → atmospheric pressure
API 620 → low pressure
Applications
API 650 → oil storage
API 620 → LNG and special liquids
Cost
API 650 → more economical
API 620 → higher cost due to complex design
How to Choose
Choose API 650 when:
storing crude oil
large capacity required
cost efficiency is important
Choose API 620 when:
storing pressurized liquids
special temperature conditions required
Engineering Support
Professional manufacturers such as Zhongneng Huajian Metal Structure can help determine the appropriate standard based on project requirements.
Conclusion
Both API 650 and API 620 serve important roles in industrial storage.
Selecting the correct standard ensures safety, compliance, and cost efficiency.
