API Spec 1B:1995 pdf download.Specification for Oil – Field V-Belt
a. In measuring the length of a V – belt, the belt shall be ro – tated around the sheaves at least two revolutions of the belt: to seat the belt properly in the sheave grooves; to divide equally the total force between the two strands of the belt; and to determine the midpoint of the center distance travel of the movable sheave, which shall define the center distance. b. The V – belt length (effective or datum) shall be calculated by adding the appropriate circumference of one of the mea – suring sheaves to twice the measured center distance be – tween the two sheaves. V – belts are not acceptable when the determined length varies from the standard length more than the values given in Tables 3,4,5 and 6. c. The belt ride shall not exceed the values given in Tables 7, 8,9, and 10.
2.9 NOMENCLATURE
3.2 METHOD This standard covers Classical V – belts and sheaves (A, B, C and D cross sections) and Narrow V – belts and sheaves (3V, 5V and 8V) which are generally used in multiple sets for power transmission applications. Appropriate information is provided for the use of joined V – belts in these cross – sections. Power rating formulas and design information is also in – cluded for molded notch V – belts (AX, BX, CX, 3VX and 5VX) and V – belts with aramid tensile member (5VA and AVA) which have greater power capacity than the conven – tional belts.
2.10 DETAILS FOR DIMENSIONAL CHECKING OF BELTS
The two methods of establishing the dimensions of meas – uring sheaves as specified in 2.7.A, 2.7.B and 2.7.C shall be by either: a. Fixing the outside diameter, the groove angle, and the groove top width. b. Fixing a diameter – over – balls or rods, and the outside diameter, and either the groove angle or groove top width. (See Figure 3). The diameter – over – balls, groove angle dimensions are given in Tables 7, 8,9 or 10. The diameter – over – balls, groove angle method is considered to be the most accurate way of fixing groove dimensions and is recommended. The cross section dimensions of the belt shall be checked by measuring the distance from the top of the belt to the top of the sheave groove (Figure 4). This measurement provides the ” ride ” of the belt with respect to the top of the groove which shall be within the limits given in Tables 7, 8,9 or 10.
API Spec 1B:1995 pdf download
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