Price Comparison Document for the Transformer Repair Project of Raw Coal Rods at Chongqing Xiangyu Salt & Chemical Co., Ltd.

1. Price comparison conditions
This quotation project—repair of the raw coal rod transformer for Chongqing Xiangyu Salt & Chemical Co., Ltd.—has been approved by Chongqing Xiangyu Salt & Chemical Co., Ltd. The project owner is Chongqing Xiangyu Salt & Chemical Co., Ltd., and the project now meets the conditions for competitive bidding. We are hereby inviting quotations and conducting a price comparison for this project.
2. Project Overview
2.1 The two oil-immersed, self-cooled transformers (model: S9-2000/10) in the raw coal briquette section have been experiencing oil leakage from high- and low-voltage porcelain bushings, aging of the cooling oil, deterioration of the breather, frequent operation under impulsive loads, prolonged overloading, and moisture absorption in the windings due to nearly three years of shutdown. Since the start-up of Project 2060, these transformers have never undergone a thorough overhaul. Replacing them with units from other sections and putting them into operation now poses serious safety risks.
2.2 Fault Symptoms: Two oil-immersed, self-cooled transformers have been experiencing oil leakage from the high- and low-voltage porcelain bushings, aging of the cooling oil, deterioration of the breather, frequent impact loads during operation, prolonged overloading, and moisture absorption in the windings due to nearly three years of shutdown. Since the start-up of Project 2060, these transformers have never undergone a thorough overhaul. Currently, there is a serious risk if they are simply transferred to other process sections for operation; therefore, they must be sent out for professional maintenance and repair.
2.3 Contract Duration: The delivery period shall be determined based on Party A’s production requirements (typically 7–15 days for minor repairs). Party B shall meet Party A’s time requirements; for each day of delay in delivery, a penalty of RMB 2,000 will be deducted. In case of special circumstances, both parties shall negotiate and communicate accordingly.
2.4 Project Scope: Repair of two raw coal rod transformers for Chongqing Xiangyu Salt & Chemical Co., Ltd.
3. Payment Terms: The quotation includes 13% value-added tax and factory-delivery freight, under a single-invoice system. Twelve months after the transformer has passed the initial acceptance inspection by Party A, Party B shall issue an invoice for 13% value-added tax. Within one month, Party A shall pay Party B 50% of the repair fee. The remaining 50% shall be paid one year after the transformer is put into normal operation and begins to function as intended.
4. This contract is valid for a period of one year.
5. Qualification Requirements for Bidders
5.1 An independent legal entity registered in the People’s Republic of China, capable of performing the contract, with a registered capital of RMB 500,000 or more;
5.2 Bidders shall provide more than three recent performance records of similar transformer maintenance work within the past year.
5.3 Before signing the contract, Party B shall pay a performance bond equal to 10% of the contract amount (based on the contract value). The bond will be fully refunded upon completion of the contract and confirmation that there are no objections.
6. Maintenance and After-sales Requirements
6.1 Maintenance and testing shall comply with relevant national standards and industry standards, including but not limited to the following standards:
"Electric Power Safety Work Procedures (Substation Section)" (State Grid Corporation of China) – 2010
DL/573-2010 "Guidelines for Maintenance of Power Transformers"
GB10237-1998 "Insulation Levels of Power Transformers and Air Gaps for External Insulation in Insulation Tests"
DLT 722-2014 Guidelines for Analysis and Interpretation of Dissolved Gases in Transformer Oil
GB50150-2006 "Standard for Handover Tests of Electrical Equipment in Electrical Installation Engineering"
DL/T7595-2000 Code of Practice for Operation of Power Transformers
DL/T 596-2005 "Code for Preventive Testing of Power Equipment"
GB/T16274-1996 "Technical Parameters and Requirements for Oil-Immersed Power Transformers"
GB1094.5-2008 "Power Transformers—Part 5: Withstand Capability Under Short-Circuit Conditions"
GBJ233-91 Code for Construction and Acceptance of Substation Engineering
DL/T 573-2021 Guidelines for Maintenance of Power Transformers
DL/T 596-2021 Code for Preventive Testing of Power Equipment
GB 26860-2011 Code for Electrical Safety Work—Electrical Part of Power Plants and Substations
DL/T 5759-2017 Code for Construction and Acceptance of Electrical Installation Works for Distribution Systems
6.2 The delivery of the two transformers must meet the following requirements:
(A) Addressing Transformer Oil Leaks: Inspection and replacement of the core and windings; replacement of high- and low-voltage bushings and pipe seals; replacement of internal O-rings in the tap-changer; inspection and replacement of the pressure relief valve; cleaning of the oil conservator oil level gauge and replacement of its cover seal; replacement of the sealing rope on the main tank cover, as well as the seals at both ends of the gas relay and the flange seal at the bottom oil pipe connection of the transformer body.
(B) Transformer Oil Testing and Analysis: Replace the desiccant and breather, and perform transformer oil filtration.
(C) Withstand voltage testing, DC resistance measurement, cleaning of transformer casing, and overall anti-corrosion painting.
(D) Inspect the tap changer of the transformer body and replace all aged components.
(E) Provide after-sales service and relevant test and inspection reports upon return to the factory.
(F) Includes round-trip shipping fees.
6.3 The transformer will be covered by a one-year warranty following repair. The repair company must ensure that the materials of replacement parts meet the on-site usage requirements and guarantee that no quality issues will arise within one year. Should any quality issues occur, the replacement parts shall be provided free of charge, and the bidding company shall be responsible for the round-trip shipping costs.
7. Technical Requirements for Transformer Maintenance of Two Units

1. The technical parameters of the transformer are as follows:
Transformer Nameplate Parameters
Product Model: S9-2000/10 Rated Capacity: 2000 kVA Rated Voltage: 10/0.4 kV
Frequency: 50 Hz, Number of phases: 3, Rated current: 115 A
Connection Group: YD11 Impedance Voltage: 5.840% Date of Manufacture: 2007.3
Manufacturer: Nanyang Xinte Factory Serial Number: 0704018
Oil weight: 968 kg; Equipment body lifting weight: 2819 kg; Total weight: 5107 kg

8. Quotation deadline.
Deadline: 3:00 PM (Beijing Time), March 13, 2025
9. Contact Information
Please send your qualification and quotation documents to the email address: xiangyuyanhua@163.com.
Contact: Wu Jiangling
Phone: 13251157583
Address: No. 98, Longxiang Avenue, Wanzhou District, Chongqing City
Supervisor: Kang Jing 023-61002070 or 13340314091

Disclaimer: The official platform for our company’s announcement of this tender is the website of Chongqing Xiangyu Salt & Chemical Co., Ltd.: http://www.cqxyyh.com. Apart from this, our company has not published any tender information on any other websites, forums, or media platforms. Any tender information reproduced from other sources and attributed to our company as the tendering entity is unauthorized and therefore invalid. We reserve the right to pursue legal action against such unauthorized reproductions.