API SPEC 7F-2010 pdf download.Oil Field Chain and Sprockets.
1 Scope This specification covers the manufacture of the components for, and the assembly and packaging of, single and multiple strand, number 40 through 240, standard and heavy series roller chains for oil field applications, including chain designation, chain length tolerance, tensile strength specifications, pin and bushing press-out specifications, and dynamic test requirements. For informational purposes, Annex A provides recommendations for installation, lubrication, and maintenance of oil field chain drives and Annex B includes a basic description of roller chain sprockets. 2 Normative References The following referenced documents are indispensable for the application of this document. For dated references, only the edition cited applies. For undated references, the latest edition of the referenced document (including any amendments) applies. ASME 1 B29.1, Precision Power Transmission Roller Chains, Attachments and Sprockets ASME B29.26, Fatigue Testing Power Transmission Roller Chain 3 Roller Chain 3.1 Chain Designation Chain covered by this specification is identified by the designation shown in the following example and in more detail in ASME B29.1. 3.2 Heavy Series Chains Heavy series chains are made in ¾ in. (19.05 mm) and larger pitches and differ from standard series chains in thicknesses of link plates. Their value is only in the acceptance of higher loads during low-speed operation. 3.3 Dimensions The general dimensions for roller chains shown in Figure 1 and Figure 2 shall be as specified in ASME B29.1.
3.5 Tensile Strength 3.5.1 Single Strand Chain Standard and heavy series single strand chain meeting the requirements of this specification will have a minimum ultimate tensile strength equal to or greater than the values listed in Table 2. 3.5.2 Multiple Strand Chain For multiple strand chain, the minimum ultimate tensile strength equals that of the single strand multiplied by the number of strands. 3.5.3 Minimum Ultimate Tensile Strength Minimum ultimate tensile strength (MUTS), for chains covered by this specification, is defined in ASME B29.1. Chains covered by this specification shall have a MUTS equal to, or greater than, the values listed in Table 1. MUTS is not a measure of the load at which a chain may be applied; it is indicative only of the tensile strength quality of the chain. Any chain tests made to verify the MUTS set by this specification are to be considered destructive. Consequently, all chain specimens subjected to such tests, failed or otherwise, are deemed unfit for application purposes. 3.6 Preloading Chains covered by this specification shall be preloaded during manufacture to a tensile load of at least 30% of the minimum ultimate tensile strength listed in Table 2. 3.7 Minimum Press-out Force 3.7.1 General The values in Table 2 represent the minimum force required to start movement of a single pin or bushing in a single link plate. The purpose of these values is to provide for the testing of pin and bushing retention characteristics. This is indicative of the aperture condition in the link plates and the interference fits of the pins and bushings in their respective link plates.
3.7.2 Pin and Pin-link Plates Chain link assemblies that are assembled with riveted pinheads shall have the rivet removed, exercising care not to remove the link plate metal below the surface of the link plate. One of the link plates shall be removed carefully to avoid destroying the joint integrity between the pins and the link plates. The remaining plate shall be placed in a hydraulically or mechanically operated testing machine with the pin link level and supported to prevent movement when pressure is applied. A single axial load shall be slowly applied to the pin, pressing the pin out of the joint toward the inside of the plate. A force less than the specified press-out load, as applicable for the subject chain, shall constitute failure of the test. 3.7.3 Roller Link Plate One of the roller link plates shall be removed using the same method as described for the pin link. Remove the two rollers from the bushings and place the plate with the two bushings in the testing machine with the plate supported to prevent movement when pressure is applied. A single axial load shall be slowly applied to the end of the bushing, pressing the bushing out of the plate. A load that is less than the specified press-out load shall constitute failure of the test.