18 Jan This test was conducted to ASTM D standards. See Engineering details below. HOSE: 4″ “GOODYEAR OILFIELD. ASTM–D – Designation: D – 94 (Reapproved ) Standard Test Methods for Rubber Ho. These test methods cover procedures for inspection and test of all types and constructions of rubber hose. In case of conflict between provisions of these.
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A number in parentheses indicates the year of last reapproval. A superscript epsilon e indicates an editorial change since the last astk or reapproval. This standard has been approved for use by agencies of the Department of Defense. These methods have been approved for use by agencies of the Department of Defense to replace Methods,,and of Federal Test Method Standard No.
The values given in parentheses are for information only. It is the responsibility of the user of this standard to establish appropriate safety and health practices and determine the applicability of regulatory limitations prior to use. Current edition approved May 1, Originally approved in Last previous edition approved in as D — 94 General Test Methods 3. The length of samples required depends on the tests which are required.
Standard – Standard Test Methods for Rubber Hose ASTM D –
The following will show the minimum length required for the various atm Nominal Bore Diameter, mm in. Use mm for all sizes of jacketed rubberlined?
NOTE 1—Volumetric samples can dd380 used for burst tests when hose is nominal 76 mm 3 in. In the case of woven-jacketed rubber-lined hose, or hose with a helical wire reinforcement, determine the length under a kPa psi internal pressure.
Use of a pi p tape graduated to read the diameter directly is acceptable.
Astm d pdf | sfdmdrd |
asfm On diameters aetm 25 mm 1 in. The measuring device shall be capable of measuring in increments of 0. All diameter measurements shall be made at least 25 mm 1 in. Wire shall be omitted from the prolongation or sample length unless the detailed physical tests include requirements that ashm the effect of the wire or metal elements in the construction. Additional length taken for purpose of tests shall be paid for by the purchaser, provided they conform to the speci?
Measurement of Hose 6. It shall not include the length of? On hose mm 6 in. For hose that has a visual inside diameter variation at the end of the hose, for example, the? Use a micrometer with a rounded anvil in contact with the inside of the hose. Contact asstm of the anvil should be about 8 mm long.
Support for the anvil should be smaller in diameter than the anvil to avoid inward? Care is needed to be sure that the anvil and the foot are square to the surface of the hose. Sufficient force shall be applied to obtain?
D — 94 6. Where backing is used on a rubber element, remove the backing before measuring thickness. Prepare the opposite side of the rubber element, adjacent to other reinforcing members, for thickness measurement as speci?
The samples to be tested shall be kept in this room for at least 30 min previous to the time of testing. NOTE 2—These special test conditions shall be con? Perform the separation without the use of a solvent, if practicable, and without excessive stretching of the rubber.
Make the separation a little at a time while the rubber is gripped near the point of separation. If it is necessary to use a solvent in the separating operation use commercial isooctane. If isooctane is used, place the rubber so as to permit free evaporation of the solvent from all parts of its surface, and allow it to rest at least 1 h before being tested. When specimen thickness is less than 1. At times acceptable test specimens cannot be obtained or true values do not result from dumbbells prepared from the hose.
In such cases substitution of sheet material in accordance with the section on pieces from Practice D is recommended. Then open these rings and lay them out? Accurately cut on each specimen a central strip of lining 38 mm 1. Separate these strips from the jacket at one end for a distance of about 38 mm. Since the width of these specimens will be less than 25 mm 1 in. NOTE 3—Adhesion tests on hose smaller than 6. Number of Tests 9. If the results do not meet the speci?
Should the results of either of these tests be below the speci? Separation of Rubber Parts Separate the rubber parts to be tested from the 3 Cut the hose to form a longitudinal specimen mm 6 in.
Flatten the specimen thus prepared and draw two parallel lines 25 mm 1 in. Determine adhesion in accordance with Lay sections of hose in a straight line on an inclined table. Pass a steel ball, 3. Hg below the external pressure. No statement is made about either the precision or bias of the ball method for measuring adhesion of hose lining since the results merely indicate whether there is conformance to the criteria speci?
Types of Tests In the latter case, the test may be used as an inspection proof test with a minimum safe limit. Bursting strength is determined on short specimens cut from the full hose lengths, but in tests for service effects and for proof inspection, the full lengths are used as specimens. The specimens may be tested, as required, in straight, curved, or kinked positions, depending upon the stresses which are desired to be evaluated. Normally the hose or hose assembly is submerged under water and a constant stream of bubbles is an indication of leakage.
Application of Pressure Connect the hose to the waterline or pump and? This is important as a safety measure because expansion of air compressed in the hose, when suddenly released by bursting or other failure, might result in serious accident. Measure the pressure with a calibrated gauge.
Submerge the hose and couplings entirely in water such that visual observations of the hose assembly is permitted.
Any evidence of leakage from the hose or couplings shall be reported. Initial appearance of bubbles may be an indication of air entrapped in the hose wall. Agitate the hose after 2 min to break the air bubbles from the hose surface. Following this a steady stream of bubbles from any location shall be considered failure satm meet the test.
Shorter or longer lengths may be burst tested when circumstances dictate, for example, when a burst on a manufactured part is speci?
The pressure shall be raised ast speci?
Standard Test Methods for Rubber Hose
Refer zstm Practice D for terminology and other statistical calculation details. Both repeatability and reproducibility are short-term; a period of a few days separate replica to test results.
A test result is the average value as speci? These were tested in varying numbers of laboratories as given in Table 1 on two different days. The appropriate value is that value of r or R associated with a mean value in the precision table closest to the main level under consideration at any given time, for any given hose in routine testing operations. Two single test results, obtained under normal test method procedures, that differ by more than this tabulated r for any given level must be considered as derived from different or non-identical sample populations.
Two single test results obtained in two different laboratories, under normal test method procedures, that differ by more than the tabulated R for any given level must be considered to have come d3380 different or nonidentical sample populations. For the r and R statements, the difference in the two d308 results is expressed as a percentage of the rhythmic mean of the two test results. Reference values do not exist for this test method since the value of the test property is exclusively de?
Bias, therefore, cannot be determined.
Hydrostatic Pressure Tests All original observations and measurements shall be taken at this pressure. Measurements shall be made using a graduated tape. The designated test pressure shall be applied at the rate speci? The test pressure shall be applied for a minimum of 15 s prior to taking? NOTE 5—The application of a pressure of 70 kPa 10 asgm prior to initial measurements is to assure that the hose is round, straight, and at manufactured length at the time of measurement.
On very low pressure hose, such as ducting, this initial pressure might have a major d30 on the attributes being measured.
In such cases a lower initial pressure will provide a more valid evaluation of these attributes. Repeatability in measurement units. Between laboratory standard deviations. Reproducibility in measurement units. Number of laboratories participating in testing this type of hose. The results shall be reported as elongation if the?