Civil Natural Gas

Scenario 1: Civil Natural Gas (Suitable for Residential Building Inlet Projects)

1. Core Requirements & Product Selection

 Sealing Key: High-seal fittings and safety valves are required for civil natural gas. We integrate resources from over 3 natural gas fitting manufacturers in China. Regular models (threaded malleable iron fittings, excellent sealing, DN20–DN80) are in sufficient stock and ship within 10 days. For projects with special natural gas pressure (e.g., high-pressure inlet), we can coordinate 30-day customized high-pressure models with Chinese manufacturers and provide high-pressure sealing test reports to ensure safety.

 Product Specification Matching:

Household Inlet Connection: DN20–DN25 threaded fittings (elbows, straight joints, suitable for gas stove installation). Chinese manufacturers produce high-accuracy threads for excellent sealing.

Building Main Line Connection: DN50–DN80 flange fittings (suitable for whole-building supply, flange sealing surfaces with natural gas-specific gaskets).

Valve Selection: Natural gas-specific ball valves (DN20–DN25) for households (with overcurrent protection, auto-closes on leakage); natural gas-specific gate valves (DN50–DN80) for main lines (corrosion-resistant to natural gas). Based on local natural gas composition, we match Chinese manufacturers with appropriate corrosion resistance to ensure long-term use.

 Material Assurance: Fittings have sulfur content ≤0.045% (prevents sulfide corrosion). Chinese manufacturers conduct sulfur content tests for each batch and provide test reports.

2. Construction & Acceptance Standards

 Installation Specifications:

Apply natural gas-specific sealant to threaded fittings (specialized sealant sourced from Chinese chemical manufacturers, 5% cost increase); avoid regular Teflon tape (prone to leakage).

Install valves horizontally (ensures normal overcurrent protection); position ≥50cm away from fire sources. We provide installation case references from Chinese residential natural gas projects for your team’s operation.

 Key Acceptance Indicators:

Air Tightness Test: Maintain 0.1MPa air pressure for 24 hours with no leakage (interface testing with soapy water).

Safety Test: Normal valve overcurrent protection (auto-closes when flow exceeds limit). We provide safety acceptance reports from Chinese natural gas projects to support your project.

3. Common Issues & Solutions

· Issue 1: Threaded interface sealing performance degrades after long-term use.

Solution: Reapply natural gas-specific sealant every 2 years (specialized sealant sourced from Chinese manufacturers); or select "fittings with seal rings" (sufficient stock from Chinese manufacturers, 10% more expensive than regular models, double sealing). For anti-loosening structures, 30-day customization can be coordinated with Chinese manufacturers to adjust thread design.

· Issue 2: Unstable pressure due to fluctuating household gas usage.

Solution: Install "pressure-stabilizing fittings" at household inlets (sufficient stock from Chinese manufacturers, 20% more expensive than regular fittings, auto-adjusts pressure). For customized pressure parameters, 30-day coordination with Chinese manufacturers is available to match local natural gas pressure.