Metal Bellows Correctedn 7/11/00 2:41 PM Page 15
PURGE CONNECTIONS (PART NUMBER P#)
Purge Connections are installed upstream of the bellows and
downstream of the liner attachment to:
• Prevent packing or caking of media borne solids in the
convolutions which would prevent the bellows from freely
flexing.
• Introduce a cooling media such as steam between the outside
of the liner and the inside of the bellows.
The number of purge connections around the circumference can be specified by adding the number after the
letter P in the Accessories portion of the part number, such as P2 or P3, etc.
PLY TESTABLE (PART NUMBER PT)
A ply testable bellows has an extra ply of material that is not required to satisfy basic design conditions. It is
a redundant ply that acts as a protective barrier between the media and the essential bellows material. By
tapping into the cavity between the redundant ply and the essential
bellows material, it is possible to detect a leak that occurs in the
redundant ply. If a leak occurs, the essential bellows material is still
present to hold pressure with full design compliance.
The ply testable bellows allows for a 100% safety factor on design. This is
a requirement for certain hazardous ASME code applications. It is highly
recommended for applications in which the cost of replacement or cost of
down time for a leaking bellows would be extreme. It is also recommended for applications in which a leak
would be very hazardous to personnel.
RED TOP
®
LEAK INDICATOR
(PART NUMBER RT)
The ply testable connection on the bellows can be fitted with a
pressure gage or another type of pressure sensing device. However,
bellows are very reliable and pressure gages that never change are
not noticed after a while. The Senior Flexonics Pathway patented
“Red Top” leak indicator is a device that extends a large red button
if a leak is detected. The red button is very noticeable from several
meters distance.
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