Siemens SITRANS P Brochure & Specs page 174

SITRANS P measuring instruments for pressure
Flushing rings
For diaphragm seals
■
Overview
2
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
■
Design
Installation example
2/174 Siemens FI 01 · 2009
© Siemens AG 2008
■
Technical specifications
Flushing ring for remote seals of sandwich and flange design
Nominal diameter
• DN 50
• DN 80
• DN 100
• DN 125
• 2 inch
• 3 inch
• 4 inch
• 5 inch
Sealing face
• To EN 1092-1
• To ASME B16.5
Flushing holes (2 off), female
thread:
Material
Nominal pressure
PN 16 ... PN 100
PN 16 ... PN 100
PN 16 ... PN 100
PN 16 ... PN 100
Class 150 ... class 600
Class 150 ... class 600
Class 150 ... class 600
Class 150 ... class 600
Form B1
Form B2
Form D/Form D
Form C/Form C
Form C/Form C
Form E
Form F
RF 125 ... 250 AA
RFSF
RJT ring groove
• G¼
• G½
• ¼-18 NPT
• ½-14 NPT
Stainless steel 1.4404/316L