The following is a list of items which generally need to be addressed when preparing to lay-up a unit or system;

1. Safety — of personnel and property

2. Systems and/or equipment to lay-up

3. Condition of unit(s)

4. Estimated period of lay-up and work to be performed

5. The lay-up environment such as possibility of freezing

6. Estimated time available to start up unit

7. Availability of manpower to inspect and monitor unit(s) during lay-up

8. Value of unit and possible financial consequences of lay-up procedure selected

9. Compatibility between lay-up and operational chemical treatments

10. Disposal of lay-up solutions

11. System auxiliaries such as fuel additive feed systems, soot blowers etc.