The present invention relates to a protective device for
terminations of pipes carrying fluids under pressure in an engine, especially for
marine or special applications.
The field of application of the present invention especially
regards engines for marine or special applications, in which the main parts of the
surface of the engine close to the pipes delivering pressurized fluids do not reach
excessively high temperatures, in that these parts are generally clad in adiabatic
jackets, or with liquid-cooled air gaps, for thermal decoupling from the surrounding
Also in order to meet safety standards, pipes outside the
engine that deliver pressurized fluids, especially fuel and oil, at not particularly
high pressures (for instance around 5 bar), must be appropriately shielded against
the possibility of unexpected fracturing, for instance due to thermal shock, vibrations
or defects in materials.
In particular, in the event of a fracture, it is necessary
to prevent the pipe terminations from generating sudden splashes of fluid that can
be scattered over the engine and ignite when coming into contact with the hottest
parts thereof, such as turbines, exhaust manifolds, cylinder heads (in the area
of the gas exhaust openings).
Moreover it must be possible to recognize the point of
failure in order to carry out the necessary repair operations.
Protective jacketing systems using soft, not stiff, fire-retardant
materials that are wrapped around the pipes are known in the prior art: however,
these materials can become impregnated with fluid and thus eventually lose their
protective properties. Moreover they are not the ideal solution for protecting pipe
Therefore the purpose of this invention is to produce a
protective device for terminations of pipes carrying fluids under pressure, especially
oil and fuel, in an engine, especially for marine applications, which is capable
of overcoming the aforesaid drawbacks.
The object of the present invention is a protective device
for the pipe termination comprising two coupled half-bearings, that envelop the
termination at the point of connection to the engine structure. There is a double
seal that completely encapsulates the pipe termination.
Moreover discharge ducts are provided to allow the fluid
leaking from the fractured pipe to flow outwards in a visible manner, consisting
of drainage ducts through which the fluid can be seen to flow, in order to locate
and repair the point of failure.
In this way the engine is still soiled, but at controlled
and desired points, in which the temperatures are not high, and not at random with
splashing of parts that can reach high temperatures.
In particular the present invention relates to a protective
device for terminations of pipes carrying fluids under pressure, especially oil
and fuel, in an engine, especially for marine applications, as described more fully
in the claims, which are an integral part of this description.
Further characteristics and advantages of the invention
will be more apparent in the light of the detailed description of a preferred embodiment
and of an alternative embodiment thereof, illustrated, by way of a non-limiting
example, with the aid of the accompanying drawings, wherein:
- figure 1 shows an example of the protective device according to the present
- figure 2 shows a variant thereof.
Figure 1 shows an example of the termination 1 of a pipe
delivering oil to a turbine 2 of an engine not illustrated in the drawing.
The termination 1 is fixed to a flange 3 by means of a
The protective device of the termination 1 comprises two
half-bearings 5 and 6 which are coupled and fastened together by means of screws
The two half-bearings are substantially the same, one of
which (6) is illustrated in the enlarged view at the side. It comprises:
- a central part 8 suitable to contain the nut 4, or in any case to completely
envelop the fixing element of the pipe termination 1;
- a collar 9 at the pipe termination side, having a diameter of a size such as
to seal the pipe termination 1;
- a collar 10 at the side opposite the pipe termination, comprising a system to
discharge the fluid that may leak into the protective device in case of fracturing
of the pipe termination: in particular it comprises grooves 11 connecting the inside
with the outside.
Moreover a seal 12 may be applied to the lateral surfaces
of the half bearings. For instance it may be a previously applied silicone seal
with slight grooving. The seal 12 may comprise protrusions 15 on the rim for a better
"Anti-vibration keys" 14 may be present, for example on
the collar 10, suitable to prevent the clearance between the metal parts from turning
into a possible knocking effect between the surfaces and thus generating noise.
Holes 13 are provided for the fastening screws that fasten
the two half-bearings together.
The two half-bearings can be made of any material, provided
said material guarantees resistance to temperatures of up to 190°C, for example
resin or plastic, or die-cast or precision-cast aluminium.
The protective device is mounted after tightening the pipe
termination to the engine, thus it can also be advantageously used on existing engines
that have been in use for some time.
With reference to Fig. 2, an alternative embodiment of
the protective device is suitable for use on pipe terminations mounted on polygonal
head screw connections (e.g. with a hex head) instead of flange connections.
In this case the collar 10 of the half-bearing at the side
opposite the pipe termination has no grooves 11 connecting the inside with the outside,
in that the function of discharging the fluid, which may leak into the protective
device in the event of a fracture in the pipe termination, is performed by the non-coinciding
shapes of the collar 10 and of the polygonal head of the nut connection, the edges
of which coincide with the inside surface of the collar 10, while the central parts
are further away, acting as grooves.
It will be apparent to the person skilled in the art that
other alternative and equivalent embodiments of the invention can be conceived and
reduced to practice without departing from the true spirit of the invention.
From the description set forth above it will be possible
for the person skilled in the art to embody the invention without introducing any
further construction details.