NTPC LIMITED
PROJECT	: SINGRAULI STPP STAGE – I (5x2000 MW)
PACKAGE NAME	: RLA OF CRITICAL PIPING

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“Salient Technical Features of the equipment/systems/services covered in IFB No. CS- 1110(R&M)-999-2 dated 17.05.2014, Bidding Document No. CS-1110(R&M)-999-2 are mentioned below. These Salient Technical Features are mentioned only to facilitate the prospective bidders to prima-facie understand the requirements under the tender and shall not in any way limit or alter the scope of work and technical features/specification of equipment/ systems/ services covered in the Bidding Documents. Detailed provisions in regard of scope of work and technical features/ specification of equipment/ systems/ services, contained in the Bidding Documents shall be final and binding.”

SALIENT TECHNICAL FEATURES

Brief Scope of Work

The Brief scope of work for the subject RLA Study of Critical Piping Package for Singrauli STPP Stage- I (5x 200 MW) is as follows:

a)RLA Study Of Critical Piping ( Viz Main Steam, CRH, Hot Re-Heat, Feed Water, HP & LP Bypass Piping) system for 5 units of 200 MW each.

b)RLA Activity involves Visual inspection of Critical Piping system, Hanger & support inspection of critical piping system, Metallography Analysis, Advanced Ultrasonic testing ( Like LPA / TOFD) OD & Thickness Measurement, Hardness Testing , Dye Penetrant Testing etc. for all Weld Joints, Bends & Tees , Straight Pipe etc

c)Stress Analysis For Hanger And Supports Design Check / Recommendation For future Replacement.

d)Remaining Life Calculation Using FEM ( Finite Element Method )analysis for the piping system.

e)Based on the completion of the Residual life assessment ( RLA ) / Condition Assessment ( CA) for various piping systems of the plant, the contractor shall submit a comprehensive report to the owner. The report will consist of all results, recommendations and improvement proposals

f)Recommendation regarding replacement of various piping components, wherever considered essential, this recommendation shall be in three parts

a.Components requiring immediate replacement

b.Component which will need replacement after Three ( 3 ) years

c.Component which will need replacement after Six( 6 ) years.

g)Suggest measures for improvement of plant performance and up-gradation needed considering operation at full load and extension of life by 20 years after R&M based on recommendations. These proposals shall be subdivided into

a.Root cause analysis

b.Immediate measures

c.Measures to be taken in future

d.Improvement / change in O&M practices

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h)Installation & dismantling of scaffoldings for accessing complete surface of Critical Piping is in the scope of Bidder.

i)Complete Removal of Insulation from the piping system ( As per Scope) is included in Bidder’s scope.

j)Supply of New Insulation Material and its associated accessories and installation of same is in the scope of Bidder

k)Disposal of Removed Insulation is in the scope of Bidder.

Approximately 20-25 Days time has been planned for shutdown for each unit during which time RLA & CA of critical piping system mentioned above is to be completed.

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