SY/T 7635-2021 in English

Analysis of the core content of the standard

SY/T 7635-2021, as the industry standard for the process design of submarine oil pipelines in my country, systematically regulates the technical requirements for the entire process from pipe diameter selection to pipe cleaning operations for the first time. This standard particularly emphasizes the differentiated design principles for high-freezing crude oil and heavy oil pipelines.

Comparative Analysis of Key Technologies

Key Points for Implementation of the Standard

Industry application suggestions

1. Digital delivery: It is recommended to establish a three-dimensional design model that includes crude oil physical properties (Appendix A) and sea condition data
2. Emergency drills: In response to Article 5.7.5, replacement operation simulations need to be performed regularly to test the emergency power supply system
3. Pig cleaning optimization: In combination with Article 5.10.3, it is recommended to use a wax deposition monitoring system to dynamically adjust the pigging frequency

Standard evolution analysis

Compared with GB 50253-2014 land pipeline standard, this version has the following major breakthroughs:

• Added a new mud temperature influence coefficient unique to the seabed environment (Article 4.4)
• Unique heavy oil cold start calculation formula (Appendix D)
• Clearly define the speed control range of the intelligent pig (1-3m/s)