Site Preparation Guide, Second Edition - HP Integrity cx2620 Server

Table 2-2 Floor Loading Term Definitions
DefinitionTerm
The weight of the raised panel floor system, including the understructure. Expressed
in lb/ft
2
(kg/m
2
).
Dead load
The load that the floor system can safely support. Expressed in lb/ft
2
(kg/m
2
).Live load
The load that a floor panel can support on a 1-in
2
(6.45 cm
2
) area at the panel’s weakest
point (typically the center of the panel), without the surface of the panel deflecting
more than a predetermined amount.
Concentrated load
The maximum load (per floor panel) that the floor system can support without failure.
Failure is expressed by floor panels breaking or bending.
Ultimate load is usually stated as load per floor panel.
Ultimate load
The load a floor panel can support (without failure) when a wheel of specified
diameter and width is rolled across the panel.
Rolling load
Computed by dividing total equipment weight by the area of its footprint. This value
is expressed in lb/ft
2
(kg/m
2
).
Average floor load
Floor loading can be an issue in both raised and nonraised flooring environments. Rolling load
can be the most detrimental in a raised flooring environment, while total dead load can be an
issue for either. The information presented in this section addresses raised floor installations.
NOTE: Have a floor system consultant for the appropriate flooring environment verify any
floor system under consideration for a server installation.
Raised Floor Loading
Raised floor loading is a function of the manufacturer’s load specification and the positioning
of the equipment relative to the raised floor grid. While HP cannot assume responsibility for
determining the suitability of a particular raised floor system, it does provide the following
guidelines:
• Because many raised floor systems do not have grid stringers between floor stands, the
lateral support for the floor stands depends on adjacent panels being in place. To avoid
compromising this type of floor system while gaining under-floor access, remove only one
floor panel at a time.
• Larger floor grids (bigger panels) are generally rated for lighter loads.
CAUTION: Do not position or install any equipment cabinets on the raised floor system until
you have carefully examined it to verify that it is adequate to support the appropriate installation.
Average Floor Loading
The average floor load value is not appropriate for addressing raised floor ratings at the floor
grid spacing level. However, it is useful for determining floor loading at the building level, such
as the area of solid floor or span of raised floor tiles covered by the server footprint.
Typical Raised Floor Site
This section contains an example of a computer room raised floor system that is satisfactory for
the installation of a server.
Based on specific information provided by HP, Tate Access Floors has approved its Series 800
all-steel access floor with bolt-together stringers and 24 in. (61.0 cm) by 24 in. (61.0 cm) floor
panels.
Facility Characteristics 37