Table of Contents
Advertisement
Cleaning Procedures and Equipment
Quarterly Tasks
The quarterly statement of work involves a much more detailed and comprehensive
decontamination schedule and should only be conducted by experienced computer
room contamination-control professionals. These actions should be performed three
to four times per year, based on the levels of activity and contamination present. All
room surfaces should be thoroughly decontaminated including cupboards, ledges,
racks, shelves and support equipment. High ledges and light fixtures and generally
accessible areas should be treated or vacuumed as appropriate. Vertical surfaces
including windows, glass partitions, doors, etc. should be thoroughly treated. Special
dust cloths that are impregnated with a particle absorbent material are to be used in
the surface decontamination process. Do not use generic dust rags or fabric cloths to
perform these activities. Do not use any chemicals, waxes or solvents during these
activities.
Settled contamination should be removed from all exterior hardware surfaces
including horizontal and vertical surfaces. The unit's air inlet and outlet grilles
should be treated as well. Do not wipe the unit's control surfaces as these areas can
be decontaminated by the use of lightly compressed air. Special care should also be
taken when cleaning keyboards and life-safety controls. Specially treated dust wipes
should be used to treat all hardware surfaces. Monitors should be treated with optical
cleansers and static-free cloths. No Electro-Static Discharge (ESD) dissipative
chemicals should be used on the computer hardware, since these agents are caustic
and harmful to most sensitive hardware. The computer hardware is sufficiently
designed to permit electrostatic dissipation thus no further treatments are required.
After all of the hardware and room surfaces have been thoroughly decontaminated,
the access floor should be HEPA vacuumed and damp mopped as detailed in the
Weekly Actions.
Biennial Tasks
The subfloor void should be decontaminated every 18 months to 24 months based on
the conditions of the plenum surfaces and the degree of contaminant accumulation.
Over the course of the year, the subfloor void undergoes a considerable amount of
activity that creates new contamination accumulations. Although the weekly above
floor cleaning activities will greatly reduce the subfloor dust accumulations, a certain
amount of surface dirt will migrate into the subfloor void. It is important to maintain
the subfloor to a high degree of cleanliness since this area acts as the hardware's
supply air plenum. It is best to perform the subfloor decontamination treatment in a
short time frame to reduce cross contamination. The personnel performing this
operation should be fully trained to assess cable connectivity and priority. Each
exposed area of the subfloor void should be individually inspected and assessed for
possible cable handling and movement. All twist-in and plug-in connections should
be checked and fully engaged before cable movement. All subfloor activities must be
conducted with proper consideration for air distribution and floor loading. In an
effort to maintain access floor integrity and proper psychrometric conditions, the
number of floor tiles removed from the floor system should be carefully managed. In
most cases, each work crew should have no more than 24 square feet (six tiles) of
open access flooring at any one time. The access floor's supporting grid system
should also be thoroughly decontaminated, first by vacuuming the loose debris and
then by damp-sponging the accumulated residue. Rubber gaskets, if present, as the
metal framework that makes up the grid system should be removed from the grid
98 T9840 URM
December 2012
Advertisement
Table of Contents
