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Catalog #07-130 Supersedes Catalog #03-130 Air & Multipurpose General Purpose APPENDIX-GENERAL INFORMATION Heavy Duty Push-on Percent length change (elongation or contraction) is reported as right twist (to tighten couplings) is the difference between the length at 10 psi or left twist. Standing at the pressure inlet Chemical (0.069 Mpa) (except wire braided or wire spiraled) and looking toward the free end of a hose, Transfer and that at the proof pressure times 100 divided a clockwise turning is right twist and by the length at 10 psi (0.069 Mpa). Elongation counterclockwise is left twist. occurs if the length of the hose under the proof Cleaning pressure is greater than at a pressure of 10 psi g. Kink test is a measure of the ability of woven Equipment (0.069 Mpa). Contraction occurs if the length jacket hose to withstand a momentary pressure at the proof pressure is less than at 10 psi while the hose is bent back sharply on itself at a Food (0.069 Mpa). point approximately 18 inches (457mm) from Transfer one end. Test is made at pressures ranging In testing wire braided or spiraled hose, the proof Washdown from 62% of the proof pressure on sizes 3 pressure is applied and the length recorded. The inches (76 mm) and 3.5 inches (89 mm) to 87% pressure is then released and, at the end of 30 on sizes under 3 inches (76 mm). This is a test Marine seconds, the length is measured; the applied to woven jacket fire hose only. measurement obtained is termed the "original length." Material Handling h. Volumetric expansion test is applicable only to Abrasives specific types of hose, such as hydraulic or c. Percent change in outside diameter or Bulk Transfer power steering hose, and is a measure of its circumference is the difference between the Cement & Concrete volumetric expansion under ranges of internal outside diameter or circumference at 10 psi pressure. (0.069 Mpa) and that obtained under the proof Mining pressure times 100 divided by the outside diameter or circumference at 10 psi (0.069 Design Considerations Mpa). Expansion occurs if the measurement at In designing hose, it is customary to develop a Petroleum the proof pressure is greater than at 10 psi design ratio, which is a ratio between the minimum Aircraft Fueling (0.069 Mpa). Contraction occurs if the burst and the maximum working pressure. Dispensing measurement at the proof pressure is less than Dock at 10 psi (0.069 Mpa). Burst test data is compiled and the minimum value Transfer is established by accepted statistical techniques. d. Warp is the deviation from the straight line This is done as a check on theoretical calculations, drawn from fitting to fitting; the maximum Spray based on the strength of reinforcing materials and deviation from this line is warp. First, a on the characteristics of the method of fabrication. measurement is taken at 10 psi (0.069 Mpa) Steam and then again at the proof pressure. The Minimum burst values are used as one factor in the difference between the two, in inches, is the establishment of a reasonable and safe maximum warp. Normally this is a feature measured on Vacuum work pressure. woven jacket fire hose only. MAXIMUM WORKING PRESSURE IS ONE OF THE Water e. Rise is a measure of the height a hose rises ESSENTIAL OPERATING CHARACTERISTICS THAT A Discharge from the surface of the test table while under HOSE USER MUST KNOW AND RESPECT TO ASSURE Suction & pressure. The difference between the rise at 10 Discharge psi (0.069 Mpa) and at the proof pressure is SATISFACTORY SERVICE AND OPTIMUM LIFE. Washdown reported to the nearest 0.25 inch (6.4 mm). It should be noted that design ratios are dependent Normally, this is a feature measured on woven on more than the minimum burst. The hose Welding jacket fire hose only. technologist must anticipate natural decay in f. Twist is a rotation of the free end of the hose strength of reinforcing materials, and the Coupling while under pressure. A first reading is taken accelerated decay induced by the anticipated Systems at 10 psi (0.069 Mpa) and a second reading environments in which the hose will be used and the at proof pressure. The difference, in degrees dynamic situations that a hose might likely Appendix between the 10 psi (0.069 Mpa) base and encounter in service. Additional that at the proof pressure is the twist. Twist Products Chemical Charts General Information Minimum Run Requirements © 2007 The Goodyear Tire & Rubber Company. 284
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