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Revision Log

Light Sources Directorate Policies and Requirements Manual

Number: LS-ESH-PRM-1.5.4
Date: 5/4/2010
Revision: 2
Prepared by: R. Chmiel
Approved by: Andrew Ackerman (ESH&Q Manager)

1. SCOPE: As part of an effort to identify and control the risks presented by maintenance and troubleshooting of beam line equipment, management of each beam line is required to label any potentially hazardous equipment that is needed to operate the beam line.  This document provides guidance for the labeling of these items, as well as information about requirements for lockout/tagout of beamline equipment.  If, after reading this document, you still have questions, please contact a member of the NSLS ESH&Q staff.

2. RESPONSIBILITIES: The beam line Local Contact or designee is required to follow these requirements. The NSLS ESH&Q Staff will inspect labels during Tier I safety tours to confirm that the equipment labeling is appropriate.

3. REQUIREMENTS: Inspect your entire beam line.  For most X-ray lines, that means from the shield wall to the end station.  Some beam lines may have equipment behind the shield wall. Inspection of these items will need to be coordinated with an X-Ray maintenance period for access. Any front-end controllers or power supplies that you do not own and that are under or adjacent to your beam line and wired to NSLS equipment located behind the shield wall, will be labeled by NSLS Staff.  For VUV/IR beam lines, all equipment that is downstream of the first isolation valve and meets the criteria is to be labeled.  Equipment upstream of that valve is considered the beam line ‘front end’ equipment and will be captured by Light Source Staff. The goal here is to identify equipment that could cause harm to someone unfamiliar with a particular device.  These rules should be considered as the minimum requirements for labeling on the beam lines.  You may choose to label other devices, but we caution that too many labels can dilute their effectiveness. If you are not sure if a device needs a label, contact an NSLS ESH&Q Staff member.

Remember it is the responsibility of the Beamline Local Contact to assure that any equipment added to the beamline, whether commercial off the shelf or custom, new or used, must be labeled properly prior to use.

3.1 ELECTRICAL EQUIPMENT: All electrical equipment that outputs voltages greater than or equal to 50 volts to another piece of equipment must be labeled. In addition, the equipment that receives that power needs to be labeled. Non-commercial self-assembled equipment is of particular concern and must be carefully inspected and labeled if it meets the labeling criteria. The following common beam line equipment shall be labeled: 

  • Ion pumps and controllers

  • Ion gauges and controllers

  • High voltage detectors and power supplies

  • Ion chambers and power supplies

  • Electron multipliers and power supplies

Place the label so that it is obvious to anyone approaching the device for service.  Note: You may need more than one label. 

Do not cover manufacturer’s warning labels on commercial devices, but do add the NSLS label, even if the device has a manufacturer label.  These labels indicate NSLS Lock Out/Tag Out (LOTO) requirements, which are necessary to have (in addition to the hazard warning) for anyone working on a device.

Items that can be placed in a safe state by unplugging the power cord, and do not provide power output to other devices, need not be labeled.  Examples include, read out panels and meters.

Many beam line components are wrapped with heating tape for vacuum bake out and, when operating, get hot enough to present risk to personnel.  These items are not to be labeled. These are best identified during BLOSA training with an entry on the beam line BLOSA checklist. 

3.2 MECHANICAL EQUIPMENT: Mechanical equipment with sufficient stored energy to present risk to personnel shall be labeled. The following two common mechanical components should be labeled:

  • Pneumatic valves

  • Vibration isolation springs

We have labels designed to convey mechanical concerns.  These labels are different from those used for electrical hazards. Place the label so that it is obvious to anyone approaching the device for service.

Note: Use more than one label if necessary.


  1. Any new equipment that requires a label should have one affixed before the device is put into service.

  2. Compliance with the labeling requirements will be reviewed during quarterly Tier I safety inspections.

PRM Table of Contents

Document Review Frequency 3 Years

Review signatures on file with master copy of controlled document

Document Number: LS-ESH-PRM-1.5.4

> See NSLS Quality Control Coordinator for original revision and review signatures <

Rev Description Date
1 Original Document 03/26/08
2 Changed Approved by to A. Ackerman.
Changed Prepared by to R. Chmiel

For information regarding this document contact Robert Chmiel,