W912P5-16-R-0002TSpecsAm8Page.pdf

Unit 4 Rehabilitation Old Hickory Powerhouse W912P5-16-R-0002 Amendment No. 0008 Sumner County, Tennessee

d. All data shall be recorded on the Contractor-supplied inspection sheets which shall be provided to the Government inspector prior to departure from the Contractor's facilities. Sample inspection sheets applicable for some of the required inspections are contained at the end of the section.

e. A Thrust Runner Finished Inspection Report documenting the refurbishment and containing the results of the finished inspection measurements shall be submitted prior to shipment and shipment shall not be made until the authorized by the Government.

3.7 REFURBISHMENT OF THRUST BEARING SHOES

The thrust bearing shoes are described in Paragraph 1.1.2. The requirements governing the refurbishment of thrust bearing shoes shall apply to an entire set of shoes. The thrust shoes shall be refurbished as specified below and to tolerances stated in the document, "Tolerances for Stationary Thrust Bearing Shoe Segments," found at the end of this Section and the Section 48 13 13.03, Thrust Bearing High Lift, shoe babbitt modifications.

3.7.1 General Refurbishment Requirements

The refurbishment of the shoes shall be by rebabbitting followed by machining. The Government will inform the Contractor in writing if the as needed work item to machine the shoe backside is authorized. General requirements that apply for all thrust shoe refurbishment and as needed work items are listed below:

a. Measure the shoe thickness at a minimum of three locations per shoe (near the shoe ID, center, and OD) in undamaged locations. The results of the measurements and measurement locations shall be submitted to the Government prior to the beginning of any refurbishment as part of the Contractor's detailed refurbishment procedure. These measurements are in addition to the shoe measurements and inspections which were performed in the field under Paragraph 3.2.2.

b. A Thrust Bearing Shoe Scaled Drawing(s) of an average thrust shoe shall be created from the measurements taken according to Paragraphs

3.2.2 and 3.3.2 and additional measurements as required. The drawing shall show all features and shall be in sufficient scope and detail to permit fabrication of an identical thrust shoe (minus imperfections and wear). The tolerances for decimals shall be to the nearest 0.001 inch and for fractions to the nearest 1/64 inch. The drawing shall meet the drawing standards and the requirements for submittal as listed in these Specifications.

c. The Contractor shall submit a detailed Thrust Bearing Shoe Refurbishment Procedure a minimum of 10 calendar days prior to commencing the refurbishment work, including a detailed step-by-step babbitting procedure (if applicable) and the scaled drawing created according to Paragraph b, above. The thickness measurements taken in Paragraph a above, shall be included as well as the proposed thickness for the refurbished shoes. If the refurbishment includes babbitting, the Government's intention is that the shoes be machined and/or ground to the original or as measured existing thickness (combined shoe and babbitt thickness) plus the thickness removed from the runner and thrust collar (if applicable). The Contractor shall not perform any

SECTION 48 13 13.06 Page 15