Chilled & Hot Water Piping Interconnection Works in American Embassy, New Delhi

SCOPE OF WORK & TECHNICAL SPECIFICATIONS: Chilled & Hot Water Piping Interconnection Works (Existing Plantroom to New SPX Building) Location: US Embassy, Enclave Compound New Delhi, India Project Duration, Target Deadlines: Tentative Start Date is November 16, 2026 and completion date December 21 2026. (40 working days total) Penalty and Liquidated Damages (LD): Time is the strict essence of this contract to ensure winter heating is activated by late December 2026."Since heating must be activated before late December, any delay in handing over the charged pipelines beyond 20th December the liquidated damages (LD) clause may apply in accordance with contract clauses FAR 52.211-12 at the rate 1% per calendar day, the quantum of LD shall be 10% of the contract value". 1. Project Background & Objective The objective of this project is to hydraulically decouple the existing "CHILLER" from serving the residential blocks designated as "B Block" and "C Block", and to seamlessly interconnect these existing distribution loops to the high-capacity central plant located in the "NEW SPX BUILDING". The modification will utilize the existing infrastructure routed through a newly excavated tie-in zone. The final network configuration must guarantee strict isolation capabilities, dynamic flow balancing, and system parameters monitoring via accessible underground civil valve chambers (manholes). The design must withstand the harsh environmental parameters of New Delhi, preventing ground moisture ingress and condensation thermal losses. 2. Detailed Scope of Work (SOW) The Contractor shall provide all labor, premium materials, construction equipment, specialized tools, shoring, excavation machinery, dewatering systems, and professional supervision required to complete the following works on a turnkey basis: -- 1 of 10 -- 2.1. Pre-Construction, Mapping & Approvals • As-Built Verification: Physically survey, map, and verify the exact alignment depths, material conditions, and coordinates of the existing 250 mm (CHW)and 200 mm (HW) headers as referenced in the system line schematic. • Utility Clearance: Conduct rigorous Ground Penetrating Radar (GPR) scans to mark out buried electrical grids, telecom lines, and water infrastructure. Obtain utility clearances and permits • Method Statement: Submit a comprehensive Method Statement, Project Schedule (Gantt Chart), and localized Risk Assessment (RAMS) detailing execution steps, focusing on the critical plant shutdown window. 2.2. Civil Excavation & Structural Masonry • Excavation Operations: Excavate the earth at two distinct tie-in locations down to the necessary depth of 8 to 10 feet (approx. 2.4 m to 3.0 m) to establish clear access to the headers. Clear internal structural plan dimensions must be around 6 feet × 6 feet (1.8 m × 1.8 m). • Shoring & Trench Safety: Install robust structural timbering or steel sheets to secure loose soil walls in strict accordance with IS:3764 standards. Keep the workspace fully dry using continuous automatic dewatering pumps to handle subsurface water weeping or sudden precipitation. • Manhole Structural Foundation: Lay a 100 mm thick Plain Cement Concrete (PCC 1:4:8) mud-mat foundation, followed by a monolithic, minimum 150 mm thick Reinforced Cement Concrete (RCC) bottom slab of M25 Grade reinforced with 10 mm TMT bars at 150 mm center-to-center (c/c) both ways. • Wall Infrastructure: Construct load-bearing chamber walls using first-class burnt clay engineering bricks in a unified 1:4 Cement Mortar mix using Ordinary Portland Cement and graded Stone Dust. • Surface Finishing: Apply a smooth 10 mm thick cement plaster coat in a 1:4 ratio (cement to clean washed sand) on all internal and external masonry faces, complete with integrated liquid waterproofing additives. -- 2 of 10 -- • Structural Top Slab & Access Cover: Cast a heavy-duty, minimum 100 mm thick structural M25 concrete slab reinforced with 10 mm TMT steel bars at 150 mm c/c both ways. Integrate a 3 feet (900 mm) clear diameter circular Grade 316 Stainless Steel heavy-duty air-tight frame and cover matching Class D400 loading characteristics as per IS:1726. 2.3. Mechanical, Valving & Piping Modifications • Pipe Adaptation: Cut into the existing pipelines and install high-strength concentric/eccentric carbon steel reducers (300 mm → 250 mm and 300 mm → 200 mm) to seamlessly step down the primary distributions arriving from the New Building into the regional residential circuits. • Valving Matrix: Mount industrial-grade Butterfly Valves (BFV) for complete positive isolation lines and Static/Dynamic Manual Balancing Valves (BLV) positioned on the Chilled Water Return (CHWR) and Heating Water Return (HWR) lines for precise hydraulic regulation. • Structural Pipe Supports: Erect structural steel support frames (ISMC sections conforming to IS:2062) inside the chambers. All piping components must securely rest on adjustable saddle assemblies with 10 mm thick heavy- duty neoprene anti-vibration pads to isolate structural loads and prevent thermal bridging. • Welding & NDT Inspections: Execute multi-pass butt welding using certified IBR (Indian Boiler Regulations) or ASME Section IX qualified welders. Perform 100% Visual Inspection and a minimum of 25% Radiographic / Magnetic Particle Testing (MPT) on all newly formed field welds. • Hydrostatic Testing: Pressurize the newly completed interconnection loop assembly at 1.5× the maximum working pressure (minimum 10.5 kg/cm² / 150 PSI) and maintain it for an uninterrupted duration of 4 hours. Document pressure charts prior to wrapping and insulating. 2.4. Thermal Insulation & Anti-Corrosive Protection • Underground Pipe Protection (External Sections): Clean bare carbon steel surfaces to SA 2.5 standards, apply two initial coats of anti-corrosive -- 3 of 10 -- bitumastic primer, and wrap with a 4 mm thick polymer-modified asphaltic anti-corrosive tape (e.g., Pypk…