Diaphragm Seals - ABB 2600T Série Mode D'emploi

6 Diaphragm seals

6.1 Seals handling
− Diaphragm seals equipped transmitters require a particular
attention during handling and installation to avoid damaging the
device.
− For capillary equipped transmitters (gauge or differential) avoid
lifting the device by gripping the capillary.
− Avoid excessively bending the capillary, the maximum bending
radius is 12.5 cm (5 inches).
− The diaphragm surface is delicate and could be damaged.
Therefore, leave the diapgragm protection covers in place until the
final installation and when the ptotection has been removed, avoid
placing the seal with the diaphragm in contact with a hard surface.
6.2 Seals installation
Before proceeding with the installation be sure that the diaphragm
seal MWP (Maximum Working Pressure limit) is in compliance with the
mating process connection.
The diaphragm seal MWP is written on the transmitter main nameplate
(MWP for differential pressure transmitters, OVP for gauge and
absolute pressure transmitters). Check that the fill fluid type and
temperature limit is in compliance with your environmental/process
conditions. The transmiiter has been delivered with wetted materials
according to the model numer specified on the nameplate. Before
proceeding with the installation consider wetted material process
compatibility.
If you are installing a diaphragm seal which requires a gasket (S26CN,
S26F, S26J, S26M, S26P, S26R, S26S, S26U, S26V, S26W ) be sure
to use a suitable gasket for your processfluid, check that the
temperature and pressure limit are compatible with your application.
Properly position the gasket so that it does not tpress down the
diaphragm. A gasket not properly installed may affect the transmitter
measurement. When installing flushing rings make sure that the gasket
is properly aligned on the gasket sealing surface.
6.3 Bolt torquing
During the installation of flanged or wafer type seals the bolts have to
be torqued to the specific flange and gasket requirements. The torque
requirement is a function of the gasket and bolts material.
6.4 Vacuum application consideration
When installing remote diaphragm seals in application working below
the atmospheric pressure, check that the fill fluid curves are in
compliance with your application. The transmitter must be located
below or at the bottom process tap. In case of doubts please refer to
the integral instruction manual that can be downloaded at www.abb.
com/pressure or refer to your ABB Instrumentation dealer.
6.5 Wafer (pancake) seals (model S26W)
Wafer seals installation requires the user to apply a blind flange to
connect the seal to the process, the type, size and material of the
blind flange must be in compliance with the mating process
connection counterflange.
6.6 Off-line threaded and flanged seals
(models S26T and S26M)
The upper and lower housing is preassembled at the factory. When
connecting the S26T off-line threaded seal to the process pipe, do not
overtighten the seal. Torque value should be in compliance with
ANSI B1.20.1 or applicable torque requirements for pipe connections.
In case the lower housing needs to be disassembled from the upper
housing, when riassembling be sure to replace the gasket with a new
gasket of the same tipe (see spare part list for part number).
The bolts should be thighten to 25 Nm.
6.7 Saddle and Socket seals (model S26V)
Saddle and Socket seals are delivered with all the parts necessary to
perform a correct installation.
The lower housing has to be welded to the process pipe.
When welding the lower housing to the process pipe, the upper
housing has to be removed.
The upper housing can be installed on the lower housing whe it has
cooled down.
Before positioning the upper housing be sure that the gasket has
been properly placed in its seat.
Bolts torque value for socket and saddle seal is 20 Nm.
6.8 Sanitary seals (model S26S)
ABB sanitary seals may be supplied with a 3A symbol which is printed
on the seal body. To properly install 3A approved seals please refer to
the integral version of the instruction manual that can be downloaded
from www.abb.com/pressure.
6.9 Threaded seals for Pulp&Paper (model S26K)
Threaded seals for Pulp&Paper should be installed considering the
proper torquing value which is a function of the thread type.
2600T Series Pressure transmitters | SOI/266-XC Rev. J 15
6 Diaphragm seals