Autodesk 235B1-05A761-1301 - AutoCAD MEP 2010, User Manual

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reverse flow The changing of direction of the fluid, such as water, that travels through a pipe or series of
pipes.
revision clouds A cloud-like boundary used to designate changes made to the final construction drawings.
rise/run The pitch of an inclined segment, usually expressed as the ratio of the vertical rise to the horizontal
run. Rise is the vertical difference in elevation from end to end of the segment. Run is the horizontal distance
covered by the segment. Also referred to as slope.
riser (1) A vertical assembly of pipe segments and fittings that distributes a fluid such as water in an upward
direction, typically between floors.
riser (2) A vertical assembly of piping that connects a faucet to the water supply stop valve. See also
component.
riser diagram See isometric riser diagram and orthographic riser diagram.
riser objects The common symbols used in a riser diagram: drop, riser, tee up, tee down, drop and run, drop
and turn, tee off top, tee off bottom, cross and riser, plan elbow, and plan tee.
routing Minimizes the number of steps when completing a layout. It calculates the position of the elbow
while drawing the next segment with a specific angle.
run (1) An assembly of building system components that is used to carry air or water from one point, such
as an air terminal or a pump, to another point, such as the junction of another run. See also component.
run (2) A portion of a pipe or fitting lying in a straight line in the same direction of flow as the pipe to
which it is connected.
sampling circuit A circuit whose output is a sampling of the values of the input at a series of points in time.
sand filter A filter consisting of graded layers of sand and aggregate for purifying domestic water.
sanitary A gravity drain system that requires piping to slope at a specific angle so that fluid drains properly.
The US standard for angles is typically a specific distance over one foot, i.e., 1/4 inch/1 foot.
schedule A tabulation of data extracted from objects in the drawing. Used to create bill of materials, panel
loads, and related tabulations.
schedule table The tabular representation of schedule data extracted from the drawing, formatted according
to rules set in a schedule table style.
schedule tag A unique annotation tag linked to a drawing object by a schedule anchor for the purpose of
extracting schedule data and displaying it in the drawing.
scheduling The process of producing graphical tables showing details of the materials required to purchase
and build the system. For example, a panel schedule is a table listing all the circuits and components associated
with a specific panel in a building structure.
schematic A not-to-scale 2D drawing or view, used to show the logic or flow of a plumbing system. Schematic
design is the initial design phase of a building project and usually includes the general arrangement of
equipment and basic system layout.
schematic design phase Initial design phase of a building project. Also referred to as conceptual or preliminary
design.
section (1) A representation of an object as it would appear if cut by an imaginary plane, showing the
internal structure.
section (2) A representation of a building, or portion thereof, drawn as if it were cut vertically to show the
interior.
section (3) An orthographic projection of a model.
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