Siemens SITRANS P - Manual (Page 174)

SITRANS P measuring instruments for pressure
Flushing rings
For diaphragm seals
2/174 Siemens FI 01 · 2009
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Overview
Flushing ring
Flushing rings are required for flange-mounted and sandwich-
type remote seals (Order No. 7MF4900 ... 7MF4923) if the dan-
ger exists that the process conditions and the geometry of the
connection could cause the medium to form deposits or block-
ages.
The flushing ring is clamped between the process flange and
the remote seal.
Deposits can be flushed away from the diaphragm through the
holes in the side, or the pressure volume can be vented. Different
nominal diameters and forms permit adaptation to the respec-
tive process flange.
Process connection
For flanges to EN and ASME:
DN 50, 80, 100, 125; PN 16 ... 100 or
DN 2 inch, 3 inch, 4 inch, 5 inch; Class 150 ... 600
Standard design
Material: CrNi-Stahl, mat. No. 1.4404/316L
Sealing faces and flushing holes: See Selection and Ordering
data
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Design
Installation example
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Technical specifications
Dichtung
Spülring
Measuring
point flange
Flushing outlet
Remote seal flange
Gasket
Flushing inlet
Flushing ring
Flushing ring for remote seals of sandwich and flange design
Nominal diameter Nominal pressure
• DN 50 PN 16 ... PN 100
• DN 80 PN 16 ... PN 100
• DN 100 PN 16 ... PN 100
• DN 125 PN 16 ... PN 100
• 2 inch Class 150 ... class 600
• 3 inch Class 150 ... class 600
• 4 inch Class 150 ... class 600
• 5 inch Class 150 ... class 600
Sealing face
• To EN 1092-1 Form B1
Form B2
Form D/Form D
Form C/Form C
Form C/Form C
Form E
Form F
• To ASME B16.5 RF 125 ... 250 AA
RFSF
RJT ring groove
Flushing holes (2 off), female
thread: • G¼
• G½
• ¼-18 NPT
• ½-14 NPT
Material Stainless steel 1.4404/316L
© Siemens AG 2008