Carbon/graphite is the ideal material for steam and gas turbine
packing rings, and ROC Carbon is the perfect source for
high-performance segmented packing rings. Our rings feature
precision manufacturing and special material grades for
optimum sealing performance and service life.
Carbon/graphite grades used are from our Group C graphite
and Group F carbon/graphite materials. These grades have
a fine-grain structure with excellent mechanical properties.
Retaining (or "garter") springs are made from
Inconel (for temperatures above 700° F) or stainless
steel. Stops are made from cadmium-plated steel or bronze.
Sealing effectiveness of ROC Carbon turbine rings is achieved
by a combination of careful design and painstaking craftsmanship
in manufacturing. Shaft clearance calculations take into
account the coefficient of thermal expansion of both the
shaft material and the selected carbon/graphite grade as
well as the exact operating temperature. Typical segment
ends are either overlap or light-tight butt joints, and
each joint is matched and marked. Ring faces are given a
commercial lap finish.
ROC Carbon maintains an extensive inventory of the most
popular packing ring styles. Nonstandard and obsolete parts
can be manufactured and delivered in 10 working days for
routine orders. Emergency orders can often be shipped in
a day or less.
Instant OEM part cross referencing
Over the past 40 years, we have compiled a comprehensive
database of 20,000 steam turbine model numbers and part
numbers. If you can supply either number, we can quickly
determine the correct ROC part number and respond with a
quote or ship the part immediately if it is in stock.
ROC Carbon’s engineering staff is available to help
you evaluate seal problems and to recommend solutions involving
seal geometry and material. For nonstandard parts for modified
machines, we will recommend the proper turbine ring ID if
you furnish steam conditions and shaft size.
For original equipment replacement parts, please furnish
the OEM part number or the specifications of the machine.
For custom-designed parts, we are pleased to furnish drawings. If
you wish, we will design a seal for you. For fastest response,
call our toll-free number: