Page 4 - CorrugatedCatalog110913Rev8LR

Assembly Components
3
In order to produce an assembly, the fabricator will need answers to the following fve
questions.
1. Hose (type, alloy, and size): page 4-18
2. Fittings (type, alloy, and size for each end): pages 19-21
3. Length of the Assembly (either overall length or live length): page 22-24
4. Fabrication Options: page 25
5. Accessories: page 28
If you have the answers to these questions, a metal hose fabricator will be able to make your
custom assembly. If you do not have the answers to all fve questions, you will need to obtain
them. The next section (S.T.A.M.P.E.D.) is designed to help you obtain the information
necessary to determine the answers.
In this section, we will discuss the various components that make up a corrugated metal hose assembly,
and what information a metal hose fabricator will need in order to make an assembly for your
application. If you need assistance determining this information, we have also included an explanation
of how to analyze the application and make the appropriate selections.
To properly design a metal hose assembly for a particular application, the following design
parameters must be determined. To help remember them, they have been arranged to form the
acronym “S.T.A.M.P.E.D.”
1. SIZE
The diameter of the connections to which the assembly will be installed is needed to provide a proper ft.
This information is required.
2. TEMPERATURE
As the temperature to which the assembly is exposed (internally and externally) increases, the strength of
the assembly’s components decreases. Also, the coldest temperature to which the hose will be exposed
can affect the assembly procedure and/or ftting materials. If you do not provide this information, it will be
assumed that the temperatures are 70° F.
3. APPLICATION
This refers to the confguration in which the assembly is installed. This includes both the dimensions of
the assembly, as well as the details of any movement that the assembly will experience. This information
is necessary to determine assembly length and required fexibility.
4. MEDIA
Identify all chemicals to which the assembly will be exposed, both internally and externally. This is
important since you must be sure the assembly’s components are chemically compatible with the media
going through the hose, as well as the environment in which the hose is to be installed. If no media is
given, it will be assumed that both the media and the external environment are compatible with all of the
available materials for each component.
5. PRESSURE
Identify the internal pressure to which the assembly will be exposed. Also, determine if the pressure is
constant or if there are cycles or spikes. This information is important to determine if the assembly is
strong enough for the application. If no pressure is given it will be assumed that the pressure is low and
there are no pressure surges or spikes.
6. END FITTINGS
Identify the necessary end fttings. This is required since fttings for the assembly must be chosen to
properly ft the mating connections.
7. DYNAMICS
Identify the velocity at which the media will fow through the assembly. Since corrugated metal hose does
not have a smooth interior, rapid media fow can create a resonant frequency that will cause the hose to
vibrate and prematurely fail. If no velocity is given, it will be assumed that the velocity is not fast enough
to affect the assembly’s performance.
S.T.A.M.P.E.D.