If the term "shall" indicates a mandatory requirement, what does "should" imply?

The term "should" in the context of standards and guidelines implies a recommendation or best practice rather than a requirement that must be followed. This means that while it is encouraged to follow the guidance provided, there is flexibility, and it is not legally binding or mandatory like the term "shall." It reflects an expectation that, if circumstances allow, the recommendation would be adhered to, but there may be situations where following it might not be feasible or necessary.

In professional practices such as welding and pipeline construction, understanding the distinction between "shall" and "should" is crucial, as it helps in interpreting the standards and determining the level of compliance required. This understanding plays a vital role in ensuring safety and quality in operational procedures while allowing for professional judgment.