M2
recommended use of 18 mm for 5/8,
In existing facilities, it is
instead of the 16 stated in the last
preferred to convert values to exact
guide. All other designations remain
kPa and round to next lowest 0.1
the same.
kPa, unless strong reasons exist not
to use this method.
Metric pipe designations are:
Ex 1, A load capability exactly
15 18 20 25 32 40 50 65 80 90 100 125
converts to 9.58 kPa. Round to 9.5
150 mm
kPa. This is rounded, easy to
remember, less than 1 % error.
Over 150, inch x 25 = mm
(24 " x 25 =
600 mm)
Ex 2, at Richmond VA Federal
Building renovation:
Units
Use units from the ASHRAE SI
Guide.
"Existing Structure Allowable Live
Load Per Original 1959 Building
Structural
Plans Are As Follows:
Lobbies, Stairs, and Corridors- 4.8
The primary lesson learned is design
kPa, Toilets-2.9 kPa, All Other
dimensions must be rounded dimensions.
Areas 3.8 kPa"
Bar spacing, wall and slab thickness,
and similar dimensions, shall be even
Situations needing mass loading
mm (100, 250, 400 mm) not conversions.
might use the following rounded,
(ex, 305 mm)
slightly conservative, rule:
Calculations End results of structural
kPa x 100 = kg/m2
(5 kPa x 100 =
calculations, and all summary data
500 kg/m2)
shall be SI. Calculations shall be SI
to the fullest degree feasible.
Steel Deck thicknesses are being
soft converted
Cambers State in even mm. (ex, 20, 22
(ex, 38 mm).
mm)
Structural Steel shall be specified
Floor Load capacity is specified in
in SI only, such as 250 MPa. Shapes
kPa.
shall be specified according to the
millimeter sizes and dimensions in
Significant hinderance to use of kPa
ASTM A6M.
has been allowing dual dimensions. No
feel for kPa is acquired unless kPa
Welds are shown in even mm sizes.
only are used.
(ex, 5, 6 mm)
Our typical office rating is 5 kPa:
Wind Pressures are given in Pa.
with 4 kPa and
1 kPa components. Drawings and
Wind Speeds are most frequently
calculations should reflect these
given in m/s.
numbers only.
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