Section 8.3 Engineering Tests, Type Tests, and Certification
Section 8.3 covers
(a) type of tests and certification of
(b) engineering tests of
(a) the manufacturer's name and the equipment or component designation or model
(b) two sets of assembly and detail drawings showing details as specified in Section 8.3
(a) the name of the applicant (see 188.8.131.52.1)
(b) the name of the manufacturer
(c) the manufacturer's designation of the type or model tested
(d) the certifying organization's label/mark and the method of affixing the label/mark to each component or each piece of equipment subsequently manufactured, where required
(e) the method of testing, the test report, and a list of the instruments used
NOTE: This may be attached to the certificate.
(f) the conditions for use of the certificate and label/mark
(g) a statement to the effect that the component or equipment tested has met the specified test requirements
(h) any other information required in ASME A17.1/CSA B44
(i) the edition of the Code under which the component was tested and certified
(a) ±1% — masses, forces, distances, time, speeds, and hydraulic pressure
(b) ±2% — accelerations, retardations, and flow rating
(c) ±5% — voltages and currents
(d) ±10% — temperatures
(a) the porting having the range of the maximum loads for which the buffer is designed
(b) the porting having the range of the minimum loads for which the buffer is designed
(a) The instruments shall be the recording type.
(b) The instruments shall provide data for the plotting of the buffer performance curves showing time intervals, travel of test weight, velocity of test weight, and retardation of test weight during the buffer stroke, and shall be accurate to within the following tolerances:
(1) The timing device shall record time in increments of not more than 1/60 s during the entire buffer stroke.
(2) Time increments and total time shall be recorded with an error of less than ±0.5%.
(3) The position of the test weight at each time interval shall be recorded with an error of less than ±0.1%.
(4) Time, travel, velocity, and retardation shall be determined by means of a device that will provide the accuracy specified.
(a) the foundation for buffers of the spring-return type
(b) the underside of the center of the test drop-weight for buffers of the gravity-return type
After filling the buffer with oil, the procedure outlined below shall be followed to ensure that a constant oil level has been established.
(a) The buffer shall be fully compressed at slow speed, and shall then be allowed to return to its fully extended position and remain there for at least 10 min. The oil level shall then be checked.
(b) If the oil level as previously determined has changed, due to the elimination of entrapped air or due to the retention of air under pressure within the buffer, the change in level shall be noted and the procedure repeated until a constant oil level is obtained when the buffer is in its extended position.
(c) If the oil level tends to remain above the level to which it was filled, the air vents, if provided, should be checked for obstructions.
(d) When a constant oil level has been established, the level shall be adjusted to the manufacturer's lowest gauge line, and the exact level noted and recorded before making the drop tests hereinafter specified.
(a) three drop tests with a total test weight equal to the manufacturer's rated maximum load for which the porting is designed [see 184.108.40.206(a)]
(b) one drop test with a total test weight equal to the manufacturer's rated minimum load for which the porting is designed (see 220.127.116.11)
Following each drop test, the buffer shall be held in its fully compressed position for a period of 5 min, and shall then be allowed to return freely to its fully extended position and stand for 30 min to permit return of the oil to the reservoir and to permit escape of any air entrained in the oil.
On each of these tests, the average retardation of the test weight, during the stroke of the buffer, shall not exceed 9.81 m/s2 (32.2 ft/s2), and any retardation peak having a duration of more than 0.04 s shall not exceed 24.5 m/s2 (80.5 ft/s2).
On completion of the drop tests, no part of the buffer shall show any permanent deformation or injury.
(a) Two drop tests shall be made as follows:
(1) One drop test shall be made with the porting as specified in 18.104.22.168(a), with a total test weight equal to 120% of the manufacturer's rated maximum load, from a height such that the maximum velocity attained by the falling weight during the buffer compression shall be equal to 125% of the rated car speed for which the buffer is rated. In this test, the retardation shall be noted and shall be permitted to exceed the values specified in 22.214.171.124.1.
Immediately following this test, the buffer shall be examined externally for visible deformation or injury. If no damage is apparent, the buffer shall then be fully compressed at low speed and then released to determine if it will return freely to its extended position.
(2) After the buffer has been examined externally and has returned freely to its extended position, a second drop test shall be made from the same height and with the same load as specified in 126.96.36.199.1(a). During this test, the retardation shall not exceed the corresponding retardation developed in the test specified in 188.8.131.52.1(a) by more than 5%.
(b) If, for a given stroke of a buffer having more than one porting, the construction of the buffer varies for the different portings, then a strength test similar to that specified in (a)(1) shall also be made for the porting having the range at minimum loads for which the porting is designed as specified in 184.108.40.206(b).
Following each drop test, the buffer shall be held in its fully compressed position for a period of 5 min, and shall then be allowed to freely return to its fully extended position and stand for 30 min to permit return of the oil to the reservoir and to permit the escape of any air entrained in the oil.