EN 10216-5 1.4404 Seamless Stainless Tubes Pressure Ratings

EN 10216-5 1.4404 seamless stainless steel tubes (equivalent to 316L) are widely utilized across industries such as chemical processing, oil and gas, heat exchangers, and food-grade applications. For end-users, one of the most critical parameters is the pressure rating, which determines whether the tubing can operate safely under specific service conditions.

However, how do you determine the pressure rating for these tubes? In this guide, we will delve into the various technical factors that influence pressure-bearing capacity and provide guidance on how to ensure your piping systems comply with European safety standards.

 

What is the pressure rating for EN 10216-5 1.4404?

EN 10216-5 is a European standard covering seamless stainless steel tubes intended for pressure purposes.
At room temperature, it can typically withstand pressures of up to 20–25 MPa (2900–3600 psi); the specific pressure-bearing capacity depends on the tube's outer diameter and wall thickness. The exact pressure rating must be determined through calculation, based on the tube dimensions, operating temperature, and the material's allowable stress.

 

EN 10216-5 1.4404 Seamless Stainless Tubes Pressure Ratings

Reference values at room temperature (~20°C), no corrosion allowance

Nominal Diameter (DN)	Wall Thickness (mm)	Pressure Rating at 1500°F (815°C) (psi)	Pressure Rating at 900°F (482°C) (psi)	Pressure Rating at 2000°F (1093°C) (psi)
15 to 100 mm	1.0 to 3.0 mm	3625 psi	5800 psi	2175 psi
500 to 600 mm	7.0 to 12.0 mm	870 psi	2610 psi	580 psi
100 to 150 mm	1.0 to 4.0 mm	3200 psi	5075 psi	1740 psi
400 to 500 mm	6.0 to 10.0 mm	1160 psi	2900 psi	725 psi
150 to 200 mm	1.5 to 5.0 mm	2900 psi	4640 psi	1450 psi
350 to 400 mm	5.0 to 9.0 mm	1450 psi	3190 psi	870 psi
200 to 250 mm	2.0 to 6.0 mm	2610 psi	4350 psi	1305 psi
300 to 350 mm	4.0 to 8.0 mm	1740 psi	3625 psi	1015 psi
250 to 300 mm	3.0 to 7.0 mm	2175 psi	4060 psi	1160 psi

⚠️ Note: These are simplified reference values. Actual design must follow applicable codes (e.g., EN 13480 or ASME B31.3).

 

 

How is Pressure Rating Calculated?

For seamless tubes under EN 10216-5, the internal pressure rating is typically calculated using the Barlow's Formula or formulas derived from EN 13480-3 (Metallic Industrial Piping).

 

P: Internal Pressure (MPa/bar)
S: Allowable Stress (based on the yield strength Rp0.2 at the operating temperature)
t: Minimum Wall Thickness (nominal thickness minus tolerance)
D: Outer Diameter

 

 

What is the pressure rating for 1.4404 stainless steel pipes at high temperatures?

1.4404 (316L) stainless steel pipes maintain a high pressure-bearing capacity even in high-temperature environments, typically withstanding pressures of up to 19,000 psi in high-pressure applications. However, their pressure-bearing capacity decreases as the temperature rises; when the temperature reaches 500°F (260°C), this capacity drops by 30% to 40%.

For instance, a 1-inch pipe with a Schedule 40 wall thickness rating will see its pressure-bearing capacity decline from 2,200 psi at 70°F to 1,200 psi at 800°F.

Temperature (°C)	Temperature (°F)	Relative Strength Factor	Pressure Rating (% of Room Temp)
20	68	1.00	100%
50	122	0.98	98%
100	212	0.95	95%
150	302	0.92	92%
200	392	0.88	88%
250	482	0.85	85%
300	572	0.80	80%
350	662	0.75	75%
400	752	0.70	70%
450	842	0.65	65%

 

What is the difference between TC1 and TC2?

EN 10216-5 defines two Test Categories: TC1 and TC2.
TC1: Standard testing. Suitable for general pressure applications.
TC2: Requires mandatory Ultrasonic Testing (UT) or Eddy Current Testing (ET) and specific longitudinal/transverse tensile tests.
Verdict: For critical high-pressure systems or hazardous media, TC2 is often mandatory to ensure there are no hidden internal flaws.

 

Checklist for Buying EN 10216-5 1.4404 Tubes

Before placing an order, ensure your supplier provides:
MTC 3.1 Certification: Confirming chemical composition and mechanical properties.
Intergranular Corrosion Test: Confirmed via EN ISO 3651-2 Method A.
NDT Results: Proof of Hydrostatic testing or Eddy Current/Ultrasonic testing.
Surface Condition: W2 (Cold finished) is preferred for better pressure integrity and surface smoothness.

 

Gnee Product Offering for EN 10216-5 Stainless Steel Tubes

Category	Description
Size Range (OD)	6.0 mm to 219.1 mm
Wall Thickness (WT)	0.5 mm to 20 mm (covers common EN ISO 1127 specifications)
Length Options	Fixed length or random length; up to 18 meters (suitable for long heat exchangers)

 

Standards & Quality Control

Category	Description
Standard Compliance	Fully compliant with EN 10216-5
Testing Categories	TC1 (Test Category 1) and TC2 (Test Category 2) available
Heat Treatment	100% solution annealed (+AT) to eliminate internal stress

 

Value-Added Services

Service	Description
U-Bending	Precision U-bending with stress relief treatment and leak testing for bent areas
Surface Finishing	Pickled & Passivated, Bright Annealed (BA), or Mechanical Polished finishes available
Precision Cutting	Cutting tolerance up to ±1.0 mm

 

Certification & Documentation

Document Type	Description
EN 10204 3.1 MTC	Material Test Certificate included for traceability and compliance
EN 10204 3.2 Certificate	Available upon request with third-party inspection