Floor Loading; Localized Pressure; Measure Contact Area; Occupied Pressure - Upright X26 Ultra Narrow Service Manual

Section 1 - General Information
1-11 F
LOOR
Floor Loading is defined as pressure imposed onto load-bearing surfaces, and can be measured as
Localized Pressure or Occupied Pressure. To calculate Floor Loading, find the Total Weight of the
machine.
TOTAL WEIGHT = MACHINE WEIGHT + MAXIMUM PLATFORM CAPACITY.
Refer to the machine specifications or contact UpRight or your UpRight dealer.
L
O C A L I Z E D
/ ² (PSI)
KG CM
Localized Pressure is measured in kilograms
per square centimeter (pounds per square
inch). It is the pressure exerted onto a small
area (contact area). Each tire and/or outrigger
imposes Localized Pressure which can cause
damage to the load-bearing surface.
NOTE: The formulas shown here are for vertical lift
machines. Applying these formulas to machines
with extending platforms will yield average
pressures for machines in stowed position.
Extending a platform causes increased localized
pressure in the direction of extension, and
decreased localized pressure at the opposite end.
M
EASURE THE
Measure the contact area of the contacting sur-
face (tire or outrigger).
The tire contact area can be determined by placing the loaded tire on a clean surface. The tire will leave
an imprint from which an area can be determined.
C
ALCULATE THE
Find the pressure exerted at each contacting surface.
NOTE: The wheel load can usually be found on a label on the
machine, or on the serial plate.
If you know the wheel load, use this formula:
LOCALIZED PRESSURE = WHEEL LOAD ÷ CONTACT AREA
If you do not know the wheel load, use this formula:
LOCALIZED PRESSURE = (TOTAL WEIGHT ÷ 4) ÷ CONTACT AREA
O
C C U P I E D
BAR (PSF)
Occupied Pressure is measured in bar (pounds per
square foot). It is the total pressure imposed onto the
work surface over the area of the machine (occupied
surface area). This is especially important when the
work surface is supported by beams. The Occupied
Pressure must not exceed the maximum load that the surface can support.
Page 1-16
L
OADING
P
R E S S U R E
C A
ONTACT REA
L
OCALIZED
P
R E S S U R E
OCCUPIED PRESSURE = TOTAL WEIGHT ÷ (LENGTH X WIDTH)
TIRE
P
RESSURE
WIDTH

Floor Loading

Figure 1-8: Contact Area
LUG TIRE OUTRIGGER
CONTACT AREA
Figure 1-9: Occupied Surface Area
LENGTH
Service Manual