Model 1199 Diaphragm Seal Systems Manual
2-4
Threaded Type Seals
FIGURE 2-3. Female Threaded Type
Seal.
Lower Housing Installation
Procedure
The threaded seal is preassembled at the factory; meaning the upper
housing and lower housings are bolted together at the required torque
specifications. The lower housing of the diaphragm seal has either a
male or female thread connection for attachment to a process pipe
nipple. When threading the lower housing to the process pipe, care
should be taken not to overtighten. The applied torque should comply to
ANSI B1.20.1 or applicable torque requirements for pipe connections.
Upper Housing Installation The threaded seal is supplied with carbon steel, 304 SST, or 316 SST
bolts and nuts. The torque specifications for the bolts attaching the
upper and lower seal housing are specified on the seal torque label for
certain seal types. The torque specifications for the RTW seal is a
minimum of 135 in-lbs (15 N-m), for all bolt materials.
Gasket Installation Threaded seals with flushing connection rings come with a sealing
gasket. When connecting the diaphragm seal, gasket, and flushing
connection ring make sure the gasket is properly aligned on the gasket
sealing surface.
Alternative System Installation
Procedure
An alternative to threading the entire transmitter/seal system to the
process piping is to unbolt the seal upper and lower housing and thread
the lower housing to the hard piping separately. Bolt the upper and
lower housings together to the required torque specification.
Note that certain gaskets, such as Grafoil
™
of Teflon
®
(PTFE), need to
be replaced once they have been torqued. Thus this alternative system
installation procedure may require gasket replacement.
Mounting
Ring
Flushing
Connection
(Lower Housing)
Gasket
NPT Process
Connection
Diaphragm
Process Side
Bolts
3051-3031D23B
Upper
Housing
Capillary
Connection
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