AS ISO 8813-2021 pdf free download – Earth-moving machinery — Lift capacity of pipelayers and wheeled tractors or loaders equipped with side boom.
4.3.3 Machines with outriggers
Tipping load calculations for machines equipped with outriggers shall be made to develop lift capacitycharts both with and without outriggers being used, in accordance with 4.3.3.1 and 4.3.3.2.
4.3.3.1 When making calculations for machines not using outriggers, the requirements of 4.3.2 apply.
4.3.3.2 When making calculations for machines using outriggers, the steering position that results inminimum tipping load shall be used to develop the lift capacity chart.
4.4 Lift mechanism lift capacity calculations
This calculation is made at a load overhang to determine the load that can be lifted at the load hookwhen the load from the lift mechanism (defined in 3.14) is less than the tipping load.Sufficient loadoverhang dimensions shall be used to develop the lift capacity chart.See figure 9.
5 Verification testing, test results and validation of calculations5.1Test site
The test site shall consist of a firm and level horizontal concrete, steel or equally firm surface and shallbe level within 1 %.
5.1.1 Dead weight test site
The load shall be applied by lifting on a fixed anchor (the ” dead weight”) and adjusting the lifting forceto achieve the balance point.
5.1.2 Live weight test site
The load shall be applied by a weight of known mass (the “live weight”) with the load overhang adjustedto achieve the balance point.
5.2Test equipment
5.2.1 Force transducer of sufficient capacity or weights of known mass.5.2.2 Means to measure the load overhang distance.
5.2.3 Means to determine that the lift point line is perpendicular to the ground reference plane.
5.2.4 Means to monitor pressure in all hydraulic circuits that will be under pressure during the liftcapacity tests.
5.3Test equipment accuracy
Accuracy of the instrumentation for the relevant parameters measured, as listed in 5.2, shall be asspecified in Iso 9248.
5.4Test conditions
5.4.1 Lift capacity shall be determined under static conditions.
5.4.2 The machine used for the tests shall conform in all significant aspects with the machinespecifications used for calculation.
5.4.2.1 Wheeled machines shall be tested at the steering position that resulted in the minimum tippingload as established in 4.3.2.
5.4.2.2 Machines with outriggers shall be tested with and without the outriggers being used, and in theconfigurations established in 4.3.3.
5.4.3 Tyres on wheeled machines shall be inflated and ballasted in accordance with the manufacturer’srecommendations.
5.4.4Track tension on crawler machines shall be adjusted to the manufacturer’s recommendation.
5.4.5 Prior to test, the machine shall be cleaned, in operating condition, and operated until the engineand lifting component fluids are at normal operating temperatures.
5.4.6 All lifting systems, rope and reeving shall be in accordance with the machine manufacturer’sspecifications. If hydraulic lift mechanisms are used, the working and the holding circuit pressure(s)shall be checked for compliance with the manufacturer’s recommendations.
5.4.7 Safety precautions shall be observed while conducting the tests. This includes following alloperating instructions furnished by the manufacturer of the machine to be tested and the test equipmentused.Means shall be provided to prevent the machine from overturning during the tests but shall notappreciably influence the test resuits.
5.5 Verifying test methods
5.5.1 All static lift capacity tests shall be run with adjustable counterweights in the extended position.
5.5.2 For dead weight tests, the boom shall be in the prescribed overhang positions to verify thecalculations. The magnitude of the force and the overhang distance that achieves the balance point orthe lift mechanism force limit shall be measured.The load lift line shall be kept vertical within ±0,25°during the test.
5.5.3 For live weight tests, the load shall be applied by a weight of a known mass and the load overhangbe adjusted to verify the balance point or lift mechanism force limit. The live weight should be kept lessthan 0,5 m from the ground reference plane while conducting the test, to reduce the possibility of themachine overturning.AS ISO 8813 pdf download.