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Skill of the Craft for Users at the STAR Complex

October 2003

1. Introduction

Many of the tasks necessary to maintain, repair, and debug the STAR detector will be carried out by Physicists (Ph.D. and graduate students). Much of this work is deemed to be within the "skill of the craft" for physicists, and as such does not require additional work planning or work permits. The purpose of this document is to define which sorts of tasks fall within this "skill of the craft" for physicists.

The following requirements apply to all personnel working at the experiment:

  • No one person is allowed to work alone on the detector or experimental equipment, two person rule applies. This excludes monitoring of experimental subsystems from the control room (unless required by procedure) or administrative desk tasks at the facility.
  • All work will be performed by authorized and appropriately trained personnel listed on a published roster maintained by the experiment.
  • If tasks are not listed as "skill of the craft", consultation is required with a Work Control Coordinator, to evaluate the task.


2. Electrical

Work on electrical devices is deemed skill of the craft if:

Voltage is < 50 V AC (or DC); AND maximum current is < 10 mA OR stored energy is < 10 Joules.

Examples of tasks allowed under this definition include:

  • removing and replacing electronic modules in VME, NIM, CAMAC crates.
  • connecting and disconnecting front panel cables (lemo, BNC, etc.) from electronics modules.
  • Instruments, detectors, and data acquisition systems may be tested and analyzed using conventional diagnostic equipment such as digital multimeters, oscilloscopes, network analzers, etc.
  • using a multimeter to measure voltages (< 50 V AC or DC) on typical PMT supplies (N.B. typical maximum currents for PMT supplies are ~2.5 mA).
  • using logic analysers to debug circuit boards.
  • using Multimeters to check various currents and voltages on circuit boards.
  • Using a computer (connecting and disconnecting computer to electrical outlet, connecting and disconnecting peripheral equipment to computer, turning on and off, etc.).
Examples of tasks which are not allowed under this definition include:
  • working with 110, 208, or 480 V AC line power sources.
  • working with exposed leads from the TPC and FTPC Low voltage power supplies.
  • measuring the output of the PMT High Voltage supply with a hand held multimeter.
  • Any work on magnet DC power buss or buss covers.

 

3. Mechanical

Movement of mechanical equipment around the STAR complex is allowed if:

No objects greater than 50 kg (110 lbs.) are to be lifted by hand
The lifting of objects greater than 20 kg (44 lbs.) is done by two persons

Examples of tasks allowed under this definition include:

  • moving computers around the facility
  • removing crates from electronics racks (once they have been unplugged)
  • carrying diagnostic equipment (multimeters, oscilloscopes,logic analyzers, etc.) around the facility.
  • Use of portable mechanical lift (i.e. foot operated lift for installing LV power supplies.
Examples of tasks not allowed under this definition:
  • operation of building cranes
  • movement of TPC sector insertion tooling
  • movement of EMC installation tooling
  • movement of the STAR detector
  • operation of hydraulic systems
  • operation of forklift
  • operation of manlifts or working on scaffolding
  • use of rigging equipment (e.g. come-alongs, etc.)
  • use of bench mounted power tools


Only safety rated ladders are to be used, and a second person must be present for working on a ladder at heights above 1.2 meters (4 feet) or must be present during tie-off procedure.

All operations within 1 meter of the beam pipe must be approved by the Experimental Shift Leader.
 
 

4. Work other than skill of the craft for a physicist

Any tasks which do not fall within the definitions given above for skill of the craft either:
  •  require approved procedures, and the individual(s) performing the task have been trained, and are documented as trained, in the procedure.
  • require further work planning. For STAR this work planning is performed by activity manager or group leader in conjuciton with either Ralph Brown (Work Control Coordinator) or Anthony Krupien (Work Control Supervisor).
Examples of tasks which require further work planning are:
  •     modifications to facility air, gas or water systems
  •     installation, modification, or upgrade of new or existing detector systems, or installation of electrical cabling, except as required in trouble shooting and short term repair as covered under this document.

 

Experimental Shift Leader :(name listed and posted in Experimental Counting House)

Experimental Spokesperson:                       T. Hallman

Deputy Experimental Spokesperson:         J. Thomas
                                                                    S. Vigdor

Liaison Physicist:                                        W. Meng

Liaison Engineer:                                         A. Pendzick

Work Control Coordinator:                         R. Brown
                                                                     A. Krupien

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This form written by
Liz Mogavero
mogavero@bnl.gov