Manual

Meriam Process Technologies www.meriam.com ph: 800.817.7849 fax: [phone]
Model 951
Orice Plates
Concentric-Segmental-Eccentric
The most common primary ow element is the concentric orice plate,
often called the “sharp-edged” orice plate. Its main advantages are: low
cost, accuracy, ease of installation, variety of construction material and
quick delivery. Much test data has been compiled about orice plates
and, with the necessary information, an exacting design can be made
providing for excellent metering accuracy.
Engineered for each application, Meriam orice plates are precision bored
to exact dimensions with a sharp upstream edge to ensure accuracy.
Orice information is stamped on the unique handle. This handle is
designed to facilitate storage of the plate without damage to the orice
bore.
Standard Meriam orice plates are 304 Stainless Steel. Monel, brass, P.V.C.,
316 Stainless Steel and other materials are available. Meriam orice plate
dimensions meet ISA specications. Meriam can provide blank orice
plates for your own boring, too.
Orice Plates Design Criteria & Tolerances
84
Standards and specications for orice plates are listed by the ISA, AGA and
ASME.
All of these do not agree in all ways. Please indicate which specications you
require so we will provide your orice plates the way you want them.
Edges – Square and sharp, will not reect a beam of light when viewed with-
out magnication.
Finish – 15-32 micro-inch roughness
Flatness – Flatness within 0.010 inches, per inch of dam height.
Bore – Orice bore tolerance in strict accordance with AGA. Gas Measure-
ment Committee Report No. 3, ASME Fluid Meters Committee Report, and
with other societies’ recommendations.
Meriam has furnished many orice plates for nuclear and fossil red power
plants, chemical plants, reneries, steel mills and to original equipment
manufacturers for incorporation in their equipment and systems.
Meriam can also provide readout instruments and accessories for complete
ow metering installation.
Line Pipe Size
½”-1½” 2” - 3” 3½”-6” 8”-12” 14”-36”
Orifice Edge
Thickness “e”
1
/
64
”
1
/
32
”
1
/
16
”
1
/
8
” ¼”
Orice Edge Thickness