There isn't a standard that says "You Must" put any step by step method to isolate eneregy, wether it be gas, steam, chemical, air pressure,steam eneregy, but there should always be a step by step method to control all eneregy. I do suggest that you do post it on the machine or have a book with those step by all machines. We used to call in the army by the numbers from 1- 100000 how to isolate all sources of eneregy prior to working on a machine, a forklift, a circuit breaker, etc etc.
Also I think this is key, remember just because OSHA or anyother Federal agency puts a standard in place, does not mean you can not make that standard more strigent to protect life limb and property. OSHA writes the standards, but OSHA does not tell you how to implement them, the implementation is on you. The standards are the bare minimum, you can always add on but never take away from a standard.
"Safety First, Safety Always"
CSP, CDS, CIH