American Petroleum Institute

Rotor Repair - First Edition
 N RP 687

Annotation

This recommended practice covers the minimum requirements for the inspection and repair of special purpose rotating equipment rotors, bearings and couplings used in petroleum, chemical, and gas industry services.

This recommended practice is separated into 7 specific chapters. Chapters 2 through 7 are to be used separately from each other and in conjunction with Chapter 1. Refer to Chapter 1, Section 2 for the process used to overhaul and refurbish a rotor.

Tutorial Discussion: The document covers equipment manufactured to the requirements of API 612 Special Purpose Steam Turbines, API 613 Special Purpose Gears, API 617 Special Purpose Centrifugal Compressors, API 619 Special Purpose Rotary Positive Displacement Compressors, API 671 Special Purpose Couplings, and Hot Gas Expanders used in FCCU Power Recovery and Nitric Acid Services.

Note: A bullet (•) at the beginning of a paragraph indicates that either a decision is required or further information is to be provided by the owner. This information should be indicated on the appropriate data sheets; otherwise it should be stated in the quotation request or in the order.

The basis of repair recommendations shall be to return dimensions required for spare parts interchangeability to the latest design fits and clearances and produce a safe reliable rotating element capable of at least 5 years of uninterrupted operation.

Note: Returning these dimensions to the latest design fits and clearances will allow the repair to:

Maintain interchangeability with other units.

Use existing spare parts.

Eliminate errors in manufacturing future spare parts that could be caused by undocumented dimensional changes.