Chemical energy must be controlled via a mechanical energy isolating device that physically prevents the transmission or release of the chemical. Chemical energy lockout devices use positive means such as a lock and key to keep the associated energy isolation device in the safe position and prevent equipment energization. Specific handling instructions may be required for some chemicals. Be aware of any special handling procedures or PPE that specific chemicals may require. Verifying the absence of chemical energy after performing lockout/tagout can be done by attempting to operate the associated components and by observing the level indicators and/or associated gages to ensure they indicate 0 pressure.