Plumbing Renovation

Scenario 3: Plumbing Renovation (Suitable for Old Building Renovation Projects)

1. Core Requirements & Product Selection

 Low-cost & Durability Key: Low-cost fittings and basic valves are required for renovation. We integrate resources from over 4 black malleable iron fitting manufacturers in China. Regular models (black malleable iron, 15% cheaper than galvanized fittings, DN25–DN80) are in sufficient stock and ship within 10 days. For non-standard angle fittings (e.g., 135° elbows) required for complex renovation layouts, we can coordinate 30-day customization with Chinese manufacturers and provide angle test reports to ensure compatibility.

 Product Specification Matching:

---Household Branch Connection: DN25–DN40 threaded fittings (elbows, straight joints, suitable for in-home installation). Chinese manufacturers produce threads with accuracy meeting international standards.

---Main Water Supply Connection: DN50–DN80 flange fittings (suitable for whole-building renovation, easy flange disassembly for later maintenance).

---Valve Selection: Cast iron ball valves (DN25–DN40) for households (low-cost); cast iron gate valves (DN50–DN80) for main lines (durable). Based on renovation budgets, we match cost-effective products from Chinese manufacturers to reduce overall costs.

 Material Assurance: Fittings are uniformly made of Q235B carbon steel (no recycled materials). Chinese manufacturers conduct appearance inspections for each batch to ensure no sand holes or deformation.

2. Construction & Acceptance Standards

 Installation Specifications:

---Apply anti-rust paint to black malleable iron fittings before installation (included with shipments, moisture-resistant paint from Chinese manufacturers); wrap threads with Teflon tape.

---Avoid heavy impacts on valves (cast iron valves are brittle); tighten handwheles with moderate force. We provide renovation installation guides from Chinese old buildings for your team’s operation.

 Key Acceptance Indicators:

---Sealing Test: Maintain 0.6MPa water pressure for 12 hours with no leakage.

---Appearance Test: No sand holes in fittings; smooth valve operation. We provide renovation project acceptance checklists from China to support your project.

3. Common Issues & Solutions

· Issue 1: Black malleable iron fittings rust easily.

Solution: Apply anti-rust paint annually (specialized paint sourced from Chinese manufacturers, 3% cost increase); or select "low-cost galvanized fittings" (10% more expensive than black malleable iron, sufficient stock from Chinese manufacturers). For stronger anti-corrosion treatment, 30-day customization can be coordinated with Chinese manufacturers to add galvanization processes.

· Issue 2: Non-standard size fittings required for complex renovation layouts.

Solution: Use "45°/90° elbow combinations" (sufficient stock from Chinese manufacturers) for adaptation. For special sizes, 30-day customization can be coordinated with Chinese manufacturers to adjust molds for rapid production.