Asbestos, sheet, compressed
Asbestos, metallic, cloth sheet
Gasket, metallic, asbestos,
In addition to the standard packing and gasket chart,
most ships have a packing and gasket chart made up
specifically for that ship. The shipboard chart shows
the symbol numbers and the sizes of packing and
Figure 15-23.--Corrugated ribbon packing.
gaskets required in the ship's piping systems,
machinery, and hull fittings.
installed and after run-in, it normally needs no further
adjustment. This means that maintenance is greatly
reduced. The resiliency and no-lint structure of CRP
Corrugated ribbon packing (CRP) is a relatively
remain unchanged at any temperature. There is no
new packing material; it is a 100 percent graphite
lubricant or additive to be squeezed out, vaporized, or
material expressly suited for installation in steam, feed,
carbonized. Also, it has a long shelf and service life.
and condensate valves. CRP (fig. 15-23) contains no
binders, resins, fillers, lubricants, or other additives. It
has the lubricating quality typical of pure graphite with
the capability for rapid heat dissipation, thus reducing
wear. Unlike conventional graphite, which is brittle,
CRP is flexible and highly resilient. When CRP is
and warning stickers must be clearly visible on
formed in a valve stuffing box, it restructures as shown
all containers to assure prevention of its use for
in figure 15-24.
This restructuring capability allows CRP to be
wrapped around the valve stem in any size valve
Use CRP with anti-extrusion rings made of graphite
stuffing box and to be formed into a ring by
filament yarn (GFY) packing. Install the rings at the
compression. It forms a solid endless packing ring
bottom (first ring) and at the top (last ring) of every
when it is compressed.
stuffing box. Set the GFY to prevent the CRP from
CRP is easily cut to a predetermined length. It does
being forced out of the stuffing box (extruded) through
not turn rock hard or shrink at any temperature. Once
Figure 15-24.--Sectional views of corrugated ribbon packing after restructuring.