Class 150 ductile iron pipe delivers a 150 رطل لكل بوصة مربعة working pressure rating (plus 100 رطل لكل بوصة مربعة surge allowance) per ANSI/AWWA C150/A21.50-91, and its cement-mortar lining combined with غلاف من البولي إيثيلين supports an expected service life > 100 years in normal soils. Its دفع على, mechanical, مقيدة و flanged joint systems simplify trench-side work while ensuring leak-tight performance. Fully compliant with AWWA C150/C151, C104/C105, C110/C111 and international ISO 2531, EN 545, EN 598 standards, this class offers a versatile, sustainable and cost-effective piping solution for water, wastewater, irrigation and industrial networks.

سيناريوهات التطبيق

Class 150 DI pipe suits a broad spectrum of projects:

• Municipal water mains in low- to medium-pressure zones, where 150 psi service is sufficient for distribution loops and rural systems.

• Gravity and force sewer mains, relying on cement-mortar lining to prevent tuberculation and control flow in wastewater applications.

• Agricultural irrigation networks, benefiting from the pipe’s smooth lining (Hazen–Williams C≈140) to reduce pump energy usage versus PVC alternatives.

• Industrial process and plant piping, where flanged Class 150 fittings connect to pumps and valves under moderate pressures.

عمر الخدمة

• > 100 عام under normal burial conditions using cement-mortar lining and polyethylene sleeving.

• Utilities report continuous service of DI mains exceeding a century with minimal rehabilitation.

• Life-cycle cost analyses demonstrate DI’s superior total-cost performance over 100 years compared with PVC and alternative materials.

التركيب والتوصيل

وصلات الضغط والمفاصل الميكانيكية

• وصلات الضغط على الوصلات feature a single rubber gasket in the bell, allowing rapid, field-friendly assembly without bolting.

• Mechanical (MJ) joints use gland-and-bolts plus elastomeric gaskets; ideal where restrained-joint performance is required without thrust blocks.

Restrained & Flanged Systems

• الوصلات المقيدة (e.g., Field-Lok®) lock spigot and bell under pressure surges, preventing separation in horizontal or vertical runs.

• أطراف ذات حواف bolt directly to pumps, valves or equipment via Flex-Ring® gaskets, ensuring rigid, leak-free connections.

الحماية من التآكل

• Internal lining: Cement-mortar per ANSI/AWWA C104 provides a durable barrier against tuberculation.

• الطلاءات الخارجية: Options include bonded zinc, asphaltic enamel or water-borne epoxy per ANSI/AWWA C105.

• Polyethylene sleeving: Loose encasement shields against stray currents and aggressive soils.

المعايير الدولية

• ANSI/ AWWA C150/A21.50 – Pressure-class thickness design.

• ANSI/ AWWA C151/A21.51 – Centrifugal-cast DI pipe dimensions and tolerances.

• ANSI/AWWA C104/C105 – Cement-mortar lining and polyethylene encasement specifications.

• ANSI/AWWA C110/C111 – Mechanical and push-on joint performance.

• ISO 2531:2012, EN 545, EN 598 – Metric pipe and fitting standards for water applications.

Comparative Parameters (Classes 52, 53, 150, 350)

المزايا

• متانة استثنائية: Proven > 100 year lifespan minimizes replacements.

• قوة عالية: Meets AWWA tensile/impact requirements for trench loads and surges.

• مقاومة التآكل: Cement-mortar and encasement virtually eliminate decay.

• Installation Flexibility: Multiple joint systems adapt to site constraints.

• الاستدامة: Up to 60 % recycled iron content; fully recyclable at end-of-life.

الأسئلة الشائعة

1. What does “Class 150” signify?
   A working pressure rating of 150 psi plus 100 psi surge allowance, per ANSI/AWWA C150.

2. How long will Class 150 pipe last?
   With proper lining and encasement, service lives exceed 100 years.

3. Which joint types are available?
   Push-on, mechanical, restrained and flanged joints per AWWA C110/C111.

4. How is corrosion controlled?
   Cement-mortar lining plus polyethylene sleeving or epoxy coatings per AWWA C104/C105.

5. What sizes are offered?
   Nominal diameters from 3″ to 64″ per ANSI/AWWA C151.

دراسات الحالة

• Huntsville, AL Water Utility: A Black & Veatch analysis showed a 3 % annual O&M saving by using DI mains over 50 years, representing > $17 million present value.

• University of Michigan LCCA: A 1 000 ft, 8″ DI main demonstrated lower total cost of ownership versus PVC across a 100-year horizon.

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