Number of Tests 9. Data are being collected to determine the precision and bias of the other hydrostatic pressure tests. B—Control valve from tank C. Shri Sai Satcharitra in Odia chapter list.
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A number in parentheses indicates the year of last reapproval. This standard has been approved for use by agencies of the Department of Defense. These methods have been approved for use byagencies of the Department of Defense to replace Methods , , , , , , , , , and of Federal Test Method Standard No.
The values given in parentheses are for informationonly. It is theresponsibility of the user of this standard to establish appro-priate safety and health practices and determine the applica-bility of regulatory limitations prior to use. Referenced Documents2. General Test Methods3. Significance and Use4. Current edition approved May 1, Published July Originally approvedin Last previous edition approved in as D — 94 United States The length of samples required depends on the testswhich are required.
The following will show the minimumlength required for the various tests Sample Length, mm in. Use mm for all sizes of jacketed rubberlined fire hose. NOTE 1—Volumetric samples can be used for burst tests when hose isnominal 76 mm 3 in. Wire shall be omitted from the prolongation or sample lengthunless the detailed physical tests include requirements thatmeasure the effect of the wire or metal elements in theconstruction. Additional length taken for purpose of tests shallbe paid for by the purchaser, provided they conform to thespecified requirements.
Measurement of Hose6. It shall not include the lengthof fittings except when specifically so requested and recorded. In the case of woven-jacketed rubber-lined hose, or hose witha helical wire reinforcement, determine the length under akPa psi internal pressure.
Use of a pi p tape graduated toread the diameter directly is acceptable. On diameters of25 mm 1 in. The measuring deviceshall be capable of measuring in increments of 0. All diameter measurements shall be made at least25 mm 1 in. Plug gauges,mm in.
Calipers,mm in. Scales,mm in. On hose mm 6 in. For hose that has a visual insidediameter variation at the end of the hose, for example, theflared or necked down end on wire braid reinforced hose,measurements shall be made at least 25 mm 1 in. Use amicrometer with a rounded anvil in contact with the inside ofthe hose.
Contact surface of the anvil should be about 8 mmlong. Support for the anvil should be smaller in diameter thanthe anvil to avoid inward flare. Care is needed to be sure thatthe anvil and the foot are square to the surface of the hose.
Sufficient force shall be applied to obtain firm contact with, butnot indent, hose surface. Where backing is used on a rubber element,remove the backing before measuring thickness. Prepare the opposite side of therubber element, adjacent to other reinforcing members, forthickness measurement as specified in the other paragraphs ofthis section, depending on the type of reinforcing member.
Test Conditions8. The samples to be tested shall be keptin this room for at least 30 min previous to the time of testing. NOTE 2—These special test conditions shall be confined to tension andimmersion testing only.
Number of Tests9. If the results do not meet thespecified requirements, prepare two additional specimens fromthe original sample and test. Should the results of either ofthese tests be below the specified requirements, consider thesample to have failed to meet the specifications.
Separation of Rubber Parts Separate the rubber parts to be tested from thebalance of the hose. Perform the separation without the use ofa solvent, if practicable, and without excessive stretching of therubber. Make the separation a little at a time while the rubberis gripped near the point of separation. If it is necessary to usea solvent in the separating operation use commercial isooctane. If isooctane is used, place the rubber so as to permitfree evaporation of the solvent from all parts of its surface, andallow it to rest at least 1 h before being tested.
Whenspecimen thickness is less than 1. At times acceptable test specimens cannot be obtained or truevalues do not result from dumbbells prepared from the hose. Insuch cases substitution of sheet material in accordance with thesection on pieces from Practice D is recommended.
Test Specimens Then open these rings and lay them outflat so as to give rectangular specimens of length equal to thefull circumference of the hose. Accurately cut on each speci-men a central strip of lining 38 mm 1. Separate these strips from the jacket at one end for adistance of about 38 mm.
ASTM D380 PDF
ASTM D380 – ゴムホースの標準試験法