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APPENDIX C
Air &
Multipurpose
General Purpose
Heavy Duty
Push-on
Chemical
Transfer
Cleaning
Equipment
Food
Transfer
Washdown
Marine
Material
Handling
Abrasives
Bulk Transfer
Cement & Concrete
Mining
Petroleum
Aircraft Fueling
Dispensing
Dock
Transfer
Spray
Steam
Vacuum
Veyance
Water
Discharge
Suction &
Discharge
Washdown
Welding
Coupling
Systems
APPENDIX
312
How To Select The Right Hose
GENERAL INFORMATION
In order to obtain the best service from any particular hose
application, two important conditions must be fulfilled:
1.
To select the right hose for the job.
2.
To make sure, that after having obtained the right hose,
it is fitted correctly and used in a proper manner.
When considering a particular hose application, the following
basic factors should be considered:
1.
Inside diameter.
2.
Outside diameter.
3.
Materials being conveyed (e.g., air, water, acids, oils,
steam, etc.).
4.
Precise composition of substance (important in the case
of oils, solvents, spraying media, foods, beverages,
petroleum products, gases, etc.).
5.
Concentration (in the case of chemicals).
6.
Maximum temperature of substance.
7.
Maximum pressure (including any possible surge or
back pressure).
8.
Degree of vacuum (in the case of suction hose).
9.
External conditions. The scope of this factor is possibly
the widest of all and covers such things as:
Abrasion.
Climactic conditions.
Direct heat.
Radiated heat.
Contamination from oil, grease, solvents, acids, etc.
End loads.
Flexings — degree and cycle.
Crushing conditions.
Kinking conditions.
10.
Details of couplings (particularly in specialized
applications).
Steam Hose
Air, steam and water hoses are the three types of hose most
used in industrial plants. The following instructions apply in
general to these types of hose. Since steam service is usually
the most severe in the average plant, particular attention is
directed to steam hose. In selecting a hose for a steam
installation it is important that the type recommended
is sufficient to handle the maximum working pressure. Your
Goodyear Engineered Products representative will assist in
making recommendations.
At elevated temperatures, steam severely affects rubber hose
of all types, so it is important that temperature be considered
in the choice of a steam hose. High steam temperature and
pressure can cause deterioration in certain reinforcing
members used in hose and a relatively small increase in
temperature can greatly affect hose performance.
The steam pressure is important in that it determines the
minimum temperature condition under which the hose will
be used. If the steam is saturated, its temperature is directly
related to its pressure. The temperature may be determined
from the Saturated Steam Table on page 317. However, if steam
is superheated, the degree of superheating must be known to
determine the actual temperature which the hose must with-
stand.
The flex factor takes into consideration the magnitude of
the flexing and its time cycle. A flexing that is rapid and
continuous, even though of small magnitude, would be
considered as severe as flexing that is large in magnitude
but with an extremely long time cycle. The degree of flexing
is an important factor in the ultimate life of the hose.
Refer to R.M.A. Technical Information Bulletin #1P-11-1.
Air Hose
Many fine types of air hose, equipped with tough, abrasion-
resisting covers and with are offered tube stocks which will
successfully resist oil mist, if present. Where tools are
lubricated through hose, only the very best quality air hose
with highest grade oil-resisting tube should be used. The
recommended working pressure should be sufficient to
withstand the maximum pressures encountered.
Water Hose
In the selection of the correct water hose for any service,
the same principles apply as for air and steam hose.
Suction Hose
Most Goodyear Engineered Products vacuum or suction hose
are designed to withstand full vacuum. However, in some of
the lighter styles, less than full vacuum is recommended.
Use the information in this catalog to help determine the best
hose for your application. To assist your efforts to collect the
data necessary to make a proper hose recommendation, use
the form on the next page.
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