P.O. BOX 330, BRANDAMORE, PA 19316
(610) 942-3190 Fax: (610) 942-3672
Commonly Used Primary Flow Devices
Used in industrial
and municipal sewers and in sewage treatment plants. The throat sections
create a constriction for the flow. This produces a head (depth of
flow) that is related to the volume discharge. The approaching flow
should be reasonably free of turbulence, eddies and waves for accurate
measurements to occur. The advantages of the Parshall flume are its
ability to self-clean and function over a wide operating flow range
with little loss in accuracy. Parshall flume size is determined by
the throat width. The flume is typically prefabricated fiberglass
and comes in many sizes.
flumes were designed to be inserted into an existing round pipe or
conduit with suitable slope, approximately 2%. The flume is primarily
used in manholes with open round channels/pipes. Some advantages of
the flume are easy installation, good accuracy and minimal flow restriction.
Disadvantages are that the flow rate range is small and they have
poor resolution (small change in flow depth to flow rate discharge).
The Palmer-Bowlus flume size is determined by the size of the pipe
or conduit in which they fit, not by the throat width. However, flume
size should be selected to suit the flow rates expected (select a
flume size equal to or less than the conduit size). When installing
the Palmer-Bowlus flume it is important that the approaching slope
(2% or less) should be straight (25 pipe diameters) and the discharge
slope should be equal to or greater than the approaching slope. The
flume itself should be level. The approaching flow should be reasonably
free of turbulence, eddies and waves for accurate measurements to
are typically prefabricated fiberglass and come in many sizes.
Many other type of flumes/weirs may
be monitored by the PDS-360 flowmeter.
ELECTRONICS, INC. P.O. Box 330, Brandamore, PA 19316
942-3190 FAX: (610) 942-3672