Samson Media 6, Монтаж и эксплуатация

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2.5 Orifice plate assembly
The direction of flow must match the arrow.
Unobstructed pipe sections are required up-
stream and downstream of the orifice plate
assembly. For the orifice tubes delivered by
SAMSON, these sections are ensured by the
weld-on calibration pipes. For orifice flanges,
the unobstructed pipe section upstream of the
orifice plate is specified in the order confir-
mation. Make sure the orifice plate assembly
as well as the seals are properly aligned with
the pipeline.
Do not install any control valves that con-
stantly change the operating state of the pro-
cess medium (e.g. manually operated control
valves or temperature regulators) upstream of
the orifice plate assembly. The operating state
should match the conditions calculated dur-
ing sizing as closely as possible. It is, how-
ever, favorable to install equipment that
keeps the operating state constant (e.g. pres-
sure regulators) upstream of the assembly.
2.5.1 Accessories
We recommend to install a shut-off valve as
well as an equalizing valve in the differential
pressure lines. They can be used to shut off
both differential pressure lines and to bypass
the indicating unit when checking zero.
2.5.2 Valve block
SAMSON offers a valve block composed of
three valves (see Fig. 4) as accessory equip-
ment. The valve block is flanged directly to the
bottom of the dp cell.
When measuring the flow rate in liquids and
gases, the SAMSON valve block can also be
mounted above the dp cell, so that the con-
nection arrangement of (+) to (+) and (–) to (–)
can be maintained. Due to this reverse instal-
lation, the pressure gauge connection can no
longer be used and is to be sealed with an
O-ring and a G ½ - LH screw cap.
14
EB 9527-3 EN
Installation
Fig. 3 · Orifice plate assembly
For gas For steam For liquids
Attachment of differential pressure lines on orifice plate assembly
Type 91
Orifice Tube
65
d
Inlet 20 to 50 x d
Outlet 5 x d
Type 90 Orifice Flange
Warning!
Max. perm. operating pressure of
40 bar for Type 90 and Type 91