EN877 Cast Iron Pipe: The Complete Technical & Buying Guide

1. EN877:2021 Standard Overview

EN877:2021 is the European standard for cast iron pipes and fittings used in drainage, sewerage, and rainwater systems. It is widely applied in building drainage, municipal engineering, and industrial sectors. The standard covers nominal diameters from DN40 to DN300, requiring pipes to deliver excellent corrosion resistance, fire resistance, and low-noise performance.

DINSEN’s EN877 cast iron pipes are manufactured in strict compliance with this standard, using a centrifugal casting process that ensures uniform wall thickness and stable performance.

• Material: Gray cast iron (EN-GJL-150 or superior), with tensile strength ≥ 200 MPa
• Connection methods: Push-fit (spigot & socket) or Hubless (SML) clamp connection
• Coating system: Dual-layer coating (epoxy primer + polyurethane topcoat), designed for high-corrosion environments

2. Dimensions & Specifications (DN40–DN300)

The following data is based on DINSEN’s internal EN877 technical documentation, covering commonly used nominal diameters. Wall thickness meets EN877 minimum requirements; weights are approximate values (kg/m).

• DN40: Outer Diameter 48 mm · Min. Wall Thickness 3.5 mm · Approx. Weight 4.2 kg/m
• DN50: Outer Diameter 58 mm · Min. Wall Thickness 3.8 mm · Approx. Weight 5.6 kg/m
• DN70: Outer Diameter 78 mm · Min. Wall Thickness 4.0 mm · Approx. Weight 7.9 kg/m
• DN80: Outer Diameter 88 mm · Min. Wall Thickness 4.0 mm · Approx. Weight 9.1 kg/m
• DN100: Outer Diameter 110 mm · Min. Wall Thickness 4.3 mm · Approx. Weight 12.2 kg/m
• DN125: Outer Diameter 135 mm · Min. Wall Thickness 4.5 mm · Approx. Weight 15.3 kg/m
• DN150: Outer Diameter 160 mm · Min. Wall Thickness 4.7 mm · Approx. Weight 18.9 kg/m
• DN200: Outer Diameter 210 mm · Min. Wall Thickness 5.3 mm · Approx. Weight 28.5 kg/m
• DN250: Outer Diameter 260 mm · Min. Wall Thickness 5.8 mm · Approx. Weight 37.0 kg/m
• DN300: Outer Diameter 310 mm · Min. Wall Thickness 6.3 mm · Approx. Weight 47.5 kg/m

Values above are typical; actual weight may vary slightly due to coating thickness. Custom sizes above DN300 are available upon request.

 3. Dual Coating System Explained

DINSEN EN877 CI Pipes come standard with a dual-layer anti-corrosion coating system, significantly extending service life:

• Primer: Epoxy-based, thickness ≥ 80 μm, providing excellent adhesion and cathodic protection
• Topcoat: Polyurethane or modified epoxy, thickness ≥ 60 μm, offering UV resistance, abrasion resistance, and chemical resistance

Total dry film thickness ≥ 140 μm, complying with EN877 Appendix C requirements. Standard coating colors include RAL 5005 (Signal Blue) and RAL 3000 (Flame Red), with custom colors available upon request.

✔ Salt spray test > 1000 hours (ASTM B117)

4. EN877 vs ASTM A888 Comparison

Buyers frequently compare EN877 with ASTM A888 (the U.S. standard). Below are the key differences:

Region: EN877 serves Europe and international markets, while ASTM A888 is primarily used in North America.

Material: EN877 uses gray cast iron (Grade 150), whereas ASTM A888 specifies gray cast iron (Grade 30B).

Dimension system: EN877 follows the metric system (DN), while ASTM A888 uses imperial measurements (NPS) with metric options available.

Minimum wall thickness: EN877 requires thicker walls (for DN100, 4.3 mm) compared to ASTM A888 (for 4″, approximately 4.0 mm).

Coating requirements: EN877 mandates a dual coating system, while ASTM A888 allows epoxy, bitumen, or even uncoated options.

Interchangeability: There are minor dimensional differences between the two standards. However, SML clamp connections can be adapted with proper fittings and adapters.

Selection Recommendation: For projects following European standards or exporting to Europe, prioritize EN877; for North American projects, ASTM A888 is preferred. DINSEN can supply both standards to meet global requirements.

5. Typical Application Areas

• High-rise building drainage and rainwater systems
• Municipal sewerage networks
• Industrial wastewater treatment facilities
• Underground utility tunnels
• Marine and offshore engineering projects
• Fire sprinkler systems (requires special coating)

EN877 Hubless pipes are the top choice for projects with strict safety and durability requirements, thanks to their high mechanical strength, Class A fire rating, and low thermal expansion coefficient.

6. Hubless (SML) Installation Key Points

Hubless (SML) clamp connection is the most advanced installation method for EN877 pipes, offering space savings, fast installation, and reliable sealing.

Installation Steps:

• Cutting: Use a dedicated cutting machine; ensure end face perpendicularity is ≤ 1 degree.
• Chamfering and Deburring: Remove internal and external burrs carefully to avoid damaging the sealing ring during insertion.
• Insertion depth: Ensure the insertion mark remains visible after assembly, confirming proper seating of the pipe within the fitting.
• Clamping tool: Use electric or hydraulic crimping pliers, following the manufacturer’s specified torque and pressure guidelines.
• Inspection: After clamping, visually check for continuous indentations around the joint and confirm there are no cracks or irregularities.

DINSEN provides complete SML fittings (elbows, tees, reducers) and EPDM sealing rings to ensure a leak-free system.

7. Purchasing Advice & Get a Quote

As a professional EN877 cast iron pipe manufacturer with over 20 years of export experience, DINSEN’s products are ISO 9001 and CE certified. We offer:

• Custom lengths (3m, 5.7m, or 6m) and coating colors
• One-stop supporting fittings, couplings, and sealing rings
• Third-party inspection reports (SGS, BV, etc.)
• Fast delivery and professional packaging (export-standard fumigation-free wooden crates)

Request a Quote for EN877 Pipes, Submit your project requirements, and the DINSEN technical team will respond within 2 hours.

Get a Quote Now: Contact us at info@dinsenpipe.com

 8. Frequently Asked Questions (FAQ)

Q: What is the difference between EN877 and EN598?

A: EN877 focuses on building drainage and rainwater systems with higher wall thickness and coating requirements. EN598 is used for sewerage applications with additional abrasion resistance requirements. DINSEN can produce both standards.

Q: How do DN and NPS correspond?

A: DN100 is approximately equivalent to 4″ NPS, and DN150 is roughly 6″. However, wall thickness and tolerances differ between the two systems. It is recommended to use fittings that match the corresponding standard.

Q: Can the dual coating be used for underground burial?

A: Yes, but for buried applications, we recommend additional protection such as epoxy coal tar or wrapping tape. DINSEN can provide complete anti-corrosion solutions for underground installations.

Q: Does Hubless connection require special tools?

A: Yes, dedicated crimping pliers and pressing dies are required. DINSEN can provide tool rental, purchase options, or on-site technical guidance.