Nov. 22, 2019
Flexible Metal Conduit Features
1. Flexible metal conduit is filled with axial displacement after internal
pressure.
Axial displacement refers to the displacement in the length direction of the
hose. When the metal hose is filled with liquid for pressurization, an axial
thrust is generated. As the pressure increases, the axial thrust increases,
thereby causing the hose to axially elongate, when the hose net sleeve is
engaged to a certain extent. , axial elongation is stopped.
Flexible Metal Conduit
2. Flexible metal conduit can compensate the lateral displacement of the
pipeline
Lateral displacement refers to the displacement perpendicular to the
direction of the hose. When the pipe produces lateral displacement, the metal
hose can be laterally displaced due to the lateral force due to the structural
characteristics, and its displacement force is much smaller than that of the
ordinary steel pipe.
3. Flexible metal conduit and tank resonance
The stiffness ratio and mass ratio of the storage tank and the main inlet and
outlet pipelines are quite different. If the basic natural vibration frequencies
of the two tanks are the same or similar, resonance will occur under the action
of the earthquake, thus increasing the damage of the storage tank, so the metal
hose The basic natural vibration frequency should be higher than 50% of the
basic natural vibration frequency of the tank.
Metal hoses manufactured in strict accordance with the production standard
specifications have a basic natural vibration frequency higher than 10 Hz. When
the basic natural vibration frequency of the tank is lower than or equal to 7
Hz, the resonance effects of the tank and the metal hose may be disregarded.
As a Conduit Fittings Manufacturers, share with you the
selection of metal hoses.
Flexible metal conduit is widely used in the petrochemical industry, but
there are also problems in the application, mainly due to the choice of hose
length and improper installation. If the length of the hose is too long, it will
cause instability of the system, increase fluid resistance, increase mechanical
damage and vibration. If the length of the hose is too short, it will not
achieve the purpose of compensation, vibration reduction and noise cancellation.
Therefore, determining the length of the metal hose is a top priority. In
addition, the following factors should be considered: the nature of the medium,
operating temperature, operating pressure, nominal diameter of the connecting
pipe, site type, connection method, displacement mode, etc.
Installation type
The correct installation of the flexible metal conduit is an important part
of ensuring that its performance is fully utilized. The flexible metal conduit
is usually installed after the root valve of the tank inlet and outlet. The
flexible metal conduit also has a valve to make the tank and the pipeline
directly form a soft connection for the inspection and replacement of the
flexible metal conduit. Flexible metal conduit has limited axial displacement
capability under natural conditions. When the installation length is equal to
the natural length, it must not withstand strong axial stretching and breakage,
resulting in pipeline leakage. Therefore, the installation length of the metal
hose is less than the natural length to ensure a certain degree of freedom.
2. Installation precautions
(1) The flexible metal conduit must be inspected before installation, and the
problem is found to be eliminated in time;
(2) During the hoisting process, measures should be taken to prevent damage
to the metal hose;
(3) Short-circuit pipes should be installed after the metal hose to
compensate for the deviation of the hose gap size;
Our company also has Liquid Tight Conduit for sale, welcome
to consult.
