Types of flexible couplings This standard covers the lubrication of the following types of flexible couplings and generally applies to other types of lubricated couplings. ?C gear couplings; ?C chain couplings; ?C metallic grid couplings. Some types of flexible couplings do not require lubrication for operation. Types of lubricants The types of lubricants for flexible couplings covered in this standard are: ?C oils; ?C greases. Lubrication methods and practices The lubrication methods and practices covered in this standard are: ?C Self-contained. In this category lubricants can be oils or greases. ?C Externally supplied. In this category@ the couplings can be continuously supplied with oil at a specified flow rate@ be dip lubricated@ submerged in oil@ or intermittently lubricated with oil that is replenished periodically. Exceptions Food and drug industry The lubricants covered by this standard are not recommended for food and drug industry applications where contact with the product being manufactured may occur. The user shall assume the responsibility for selecting the proper lubricant@ with consultation with the coupling manufacturer@ for all food and drug industry applications. Experience Coupling manufacturer??s experience based recommendations for lubricants and lubrication methods may supersede the information provided in this document subject to agreement between the user and manufacturer. Cooling This standard does not apply to couplings where an oil flow is provided solely for cooling purposes.