Carbon Steel Pipes to API 5L Grade B Standard Weight

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SUMMARY

This discussion focuses on the specifications and calculations required for procuring carbon steel pipes conforming to the API 5L Grade B standard for a chilled water piping project. The user is sourcing pipes from SEAH Korea, with diameters ranging from 250mm to 1000mm. Key parameters needed include the Coefficient of Linear Expansion (11.6 x 10^-6 K^-1), Longitudinal Elastic Modulus (1.96 x 10^4 kg/mm^2), and Allowable Stress (100 N/mm^2) at temperatures below 40°C. The discussion also highlights the equivalence between API 5L Grade B and ASTM A106/A53 Grade B, emphasizing the importance of specifying standards in purchase orders.

PREREQUISITES
  • Understanding of API 5L Grade B specifications
  • Knowledge of material properties such as Coefficient of Linear Expansion and Longitudinal Elastic Modulus
  • Familiarity with stress calculations in piping systems
  • Experience with procurement processes in engineering projects
NEXT STEPS
  • Research the detailed specifications of API 5L Grade B and its equivalents
  • Learn about the calculation methods for thermal expansion in piping systems
  • Investigate the impact of material properties on allowable stress in carbon steel pipes
  • Explore best practices for drafting purchase orders that specify engineering standards
USEFUL FOR

Engineers, procurement specialists, and project managers involved in the design and implementation of piping systems, particularly in chilled water applications, will benefit from this discussion.

danapillai
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Greetings!
This is for a Chilled water piping project (1000mm dia max). We are procuring pipes from SEAH Korea, from 250mm to 1000mm. And for calculations for support, load, thrust, etc, i need the following details for these pipes.

1. Coefficient of Linear Expansion
2. Longitudinal Elastic Modulus
3. Allowable stress (for temperature below 40 deg C)

I have got these details from a Japan manufacturer as 11.6 x 10^-6 K^-1 (0-100 deg C), 1.96*10^4 kg/mm^2 at 20 deg C, and 100 N/mm^2 respectively.

Please advise how to calculate these things for the particular standard mentioned.

Thanks!
 
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One could purchase the standard from API.

Apparently there is an equivalence among API 5L grade B/ASTM A106 Grade B/ASTM A53 Grade B. But there may be subtle differences.

Normally when one purchases a product, one specifies the applicable standard or code in the purchase order, which includes dimensional specs and materials properties, and the seller tests and certifies according to the standard.
 

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