Description
pipe 3″ SDR-32.5
GM pipe ASTM SDR 3″ SDR-32.5. ASTM series : C-class BS 3505. Ideal plumbing materials for Drain, rain water, sewerage system 0322-3540656
What is pipe 3″ SDR-32.5 gm upvc 4meter ?
Description
The 3″ SDR-32.5 GM UPVC pipe is a type of un plasticized polyvinyl chloride (UPVC, also known as rigid PVC) pressure pipe designed for conveying water and fluids in low- to medium-pressure applications. UPVC is a durable, corrosion-resistant thermoplastic material that does not contain plasticizers, making it rigid and suitable for long-term underground or above-ground use.
Specifications pipe 3″ SDR-32.5 gm upvc 4meter
The following table outlines key specifications for the 3-inch nominal size:
| Parameter | Value/Detail |
|---|---|
| Nominal Size | 3 inches (IPS) |
| Average Outside Diameter (OD) | 3.500 inches (88.9 mm) |
| Nominal Inside Diameter (ID) | 3.271 inches (83.1 mm) |
| Minimum Wall Thickness | 0.108 inches (2.74 mm) |
| SDR | 32.5 |
| Pressure Rating | 125 psi at 73°F (860 kPa); derates to 62% at 100°F (38°C) |
| Burst Pressure (Minimum at 73°F) | 400 psi (2,758 kPa) |
| Surge Pressure Allowance | 12.8 psi for 1 fps velocity change |
| Weight per Foot | 0.77 lbs/ft (1.15 kg/m) |
| Standard Length | 20 ft (6.1 m) |
| Joint Type | Gasketed bell-and-spigot (Ring-Tite™ or equivalent; ASTM D3139) |
| Gasket Material | Elastomeric (e.g., Rieber®; ASTM F477) |
| Material Properties | Tensile strength: 7,000 psi min.; Thermal expansion: 2 in./100 ft/50°F change; Pipe stiffness: ~57 psi |
| Standards | ASTM D2241 (pipe), ASTM D1784 (material), ASTM D3139 (joints), ANSI/NSF 14 (general), IAPMO listed |
| Color | Typically white or light gray (purple for reclaimed water, green for sewer force mains) |
| Flammability | Self-extinguishing; Flame spread: 10 (ASTM E162); Smoke development: 330 (ASTM E84) |
*Note: Dimensions are averages; tolerances per ASTM standards. For exact values, consult manufacturer datasheets.
Installation
Installation of 3″ SDR-32.5 GM UPVC pipe follows ASTM D2321 guidelines for underground burial and manufacturer recommendations (e.g., JM Eagle JME-06B or Uni-Bell UNI-PUB series). Key steps include:
- Preparation:
- Inspect pipes and fittings upon delivery for damage. Store off-ground and protected from sunlight/UV to prevent degradation.
- Cut pipe using a power saw or handsaw; bevel spigot end (15° angle, 1/16-inch depth) without special tools.
- Clean bell interior, gasket groove, and spigot end to remove dirt/debris.
- Joint Assembly:
- Seat the gasket fully in the bell groove.
- Apply pipe lubricant (enamel paint consistency) to the spigot bevel and first 4-6 inches.
- Align and push the spigot into the bell until the reference mark (typically 4.20 inches from end) is flush with the bell edge. Use leverage (e.g., pry bar) if needed, but avoid hammering.
- For curves: Allow up to 1-3° joint deflection per JM Eagle guidelines; minimum bend radius is 75 feet for 3-inch pipe (longitudinal bending only).
- Trenching and Embedment:
- Trench width: 12-18 inches wider than pipe OD on each side.
- Bedding: Use Class 1-4 materials (granular or compacted soil) per ASTM D2321; minimum cover 12-24 inches (deeper for traffic loads, up to 50 ft burial with E’ = 1,000 psi modulus).
- Lay pipe with bell facing uphill or in direction of flow. Support uniformly to prevent sagging.
- Backfill in layers (6-12 inches), compact to 85-95% proctor density; avoid stones >1.5 inches near pipe.
- Maximum deflection: 5% for SDR-32.5 (measure with go/no-go gauge); monitor post-installation.
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