Standard operating procedures

I cannot tell you about carbon dioxide manufacturing and refilling but I can tell you about standard operating procedures in industrial plants.

The following material will provide you more information about standard operating procedures:
How to structure quality management system documentation - https://advisera.com/9001academy/knowledgebase/how-to-structure-quality-management-system-documentation/
How to structure work instructions in the ISO 9001 QMS - https://advisera.com/9001academy/blog/2015/06/16/how-to-structure-work-instructions-in-the-iso-9001-qms/
- Enroll for free course - ISO 9001:2015 Foundations Course - https://advisera.com/training/iso-9001-foundations-course/
- book – Discover ISO 9001:2015 Through Practical Examples – https://advisera.com/books/discover-iso-9001-2015-through-practical-examples/

Is there a difference between Procedure & Standard Operating Procedure

Yes and no. Everything depends on what you do in each case. Some organizations use that terminology interchangeably. Other organizations use the word procedure for a more general document stating: what to do, by whom and when, and then when they need to specify the “how” they use “Standard Operating Procedure” or “Work Instruction”. Please check this image - and this article “How to structure quality management system documentation” - https://advisera.com/9001academy/knowledgebase/how-to-structure-quality-management-system-documentation/