SS Pipe Size Chart – IS/ANSI/DIN Standards Explained

 

Selecting the correct stainless steel (SS) pipe size is critical in achieving safe, cost-effective, and efficient pipeline design. With different international and Indian standards like IS (Indian Standard), ANSI/ASME (American), and DIN (German) in use across industries, it's essential to understand how pipe size, wall thickness, OD, ID, and pressure ratings vary.



At Udhhyog, we supply SS pipes conforming to IS, ANSI/ASME, and DIN standards, helping engineers, contractors, and buyers select the right specification for plumbing, structural, fluid, and process applications.

🧾 What Is a Pipe Size Chart?

An SS pipe size chart provides standardized information about:

  • Nominal Bore (NB) or Nominal Pipe Size (NPS)

  • Outer Diameter (OD)

  • Wall Thickness (mm or schedule)

  • Inner Diameter (ID)

  • Applicable Standard (IS/ANSI/DIN)

Udhhyog helps you interpret these standards and select the correct pipe size based on use case, material grade (SS 304/316/202), and pressure rating.

🇮🇳 IS Standard for SS Pipes – Indian Standard

✔️ Standard: IS 1239 (for ERW pipes), IS 3589 (for large diameter), IS 6911 (for stainless steel grades)

NB (mm)OD (mm)Wall Thickness (Class B/C)
1521.32.65 mm / 3.25 mm
2533.73.25 mm / 4.0 mm
4048.33.25 mm / 4.0 mm
100114.34.5 mm / 5.4 mm

📌 IS standards are typically used in civil, water, fire safety, and general plumbing in India.

🇺🇸 ANSI/ASME Standard (American)

✔️ Standard: ASME B36.10M / B36.19M

  • ASME B36.10M = carbon steel & welded pipes

  • ASME B36.19M = stainless steel pipes (sch 5S, 10S, 40S, 80S)

NPS (Inch)OD (mm)SCH 10S (mm)SCH 40S (mm)SCH 80S (mm)
½”21.31.652.773.73
1”33.42.773.384.55
2”60.32.773.915.54
4”114.33.056.028.56

🧪 ANSI standards are globally accepted in chemical, petrochemical, pharma, and oil & gas pipelines.

🇩🇪 DIN Standard (German/European)

✔️ Standard: DIN 11850, DIN 17457, and EN 10217-7

Nominal DN (mm)OD (mm)Wall Thickness (mm)
DN 10131.5
DN 25291.5 – 2.0
DN 50531.5 – 2.5
DN 1001042.0 – 3.0

🔍 DIN and EN standards are widely used in hygienic, food-grade, dairy, and pharmaceutical industries in Europe.

📊 Unified SS Pipe Size Chart – Cross-Reference Table

NPS (Inch)NB (mm)OD (mm)IS (Class B)ANSI SCH 40SDIN Equivalent (DN)
½”1521.32.65 mm2.77 mmDN 15
1”2533.43.25 mm3.38 mmDN 25
1½”4048.33.25 mm3.68 mmDN 40
2”5060.33.65 mm3.91 mmDN 50
4”100114.34.5 mm6.02 mmDN 100

Udhhyog helps you match the right IS, ANSI, or DIN specification based on your project’s standard code and technical requirement.

🧰 Applications Based on SS Pipe Standards

StandardTypical Use Cases
ISFirefighting systems, housing plumbing, borewell, general water lines
ANSI/ASMEOil & gas, chemical lines, power plants, HVAC
DIN/ENFood-grade processing, dairy, pharma, CIP systems

📦 Udhhyog Stainless Steel Pipe Range

We supply SS pipes across:

  • Grades: SS 304, SS 316, SS 202

  • Type: Seamless, ERW, Welded

  • Finish: Polished, unpolished, mirror, brush

  • Sizes: ½ inch to 24 inch (DN10 to DN600)

Each delivery includes:

✅ Mill Test Certificate (MTC)
✅ Standard marking (IS, ANSI, or DIN)
✅ Custom cutting & finishing

💰 SS Pipe Price Guide by Standard (Indicative)

StandardSizeThicknessGradePrice/ Meter (₹)
IS 123950mm NB3.65 mmSS 304₹420 – ₹460
ANSI B36.192” NPSSCH 40SSS 316₹650 – ₹700
DIN 11850DN 401.5 mmSS 304L₹580 – ₹610

📞 For latest price list & downloadable PDF chart, contact Udhhyog now.

🙋 Frequently Asked Questions (FAQ)

❓1. What is the difference between NPS and NB?

Answer: NPS (Nominal Pipe Size) is the American standard (ANSI), while NB (Nominal Bore) is used in Indian standards (IS). They may refer to the same size, but wall thickness may vary between standards.

❓2. Can I use ANSI pipes in a system designed for IS?

Answer: Not directly. Though dimensions may be close, wall thickness and pressure class differ. Udhhyog helps match equivalent options or offers custom production as per standard.

❓3. What if my project uses DIN pipes?

Answer: No problem! Udhhyog supplies DIN-standard stainless steel pipes used in food, pharma, and cleanroom applications. We can also provide EN 10217-7 certified tubes for EU projects.

❓4. How can I know which schedule or wall thickness I need?

Answer: Share your pressure, fluid type, and installation environment. Udhhyog’s technical experts will recommend the ideal thickness (Class B/C or SCH 40/80) based on your standard.

❓5. Are IS pipes lower in quality than ANSI or DIN?

Answer: Not at all. IS pipes conform to BIS quality norms. The difference lies in the standard’s sizing and usage scope. ANSI/DIN are often used in global and process-specific industries.

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