Final answer:
The maximum static pressure at the point of discharge should not exceed 30 PSI when using compressed air to clean fixtures and jigs, as per OSHA recommendations.
Step-by-step explanation:
When using compressed air to clean out fixtures and jigs, one should always observe proper safety precautions, including maintaining the air pressure below a certain maximum value to prevent injury and equipment damage. The Occupational Safety and Health Administration (OSHA) recommends that when using compressed air for cleaning purposes, the static pressure at the point of discharge should not exceed 30 PSI when dead-ended. This is because higher pressures can cause debris to be ejected at high speeds, which can potentially cause injury to the operator or others nearby. Compliant air nozzles or shields should also be used to reduce the risks associated with cleaning at pressures higher than 30 PSI.