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Introduction
BS 4504 is a British Standard that specifies the dimensions, tolerances, and pressure ratings of circular flanges for pipes, valves, and fittings. It provides a unified system of flange dimensions to ensure interchangeability across industrial piping applications.
Nominal sizes (DN): Covers DN10 to DN4000.
Pressure ratings (PN): Typically PN2.5, PN6, PN10, PN16, PN25, PN40, PN63, and PN100.
Flange types included: Welding Neck, Slip-On, Threaded, Blind, and Loose/Plate flanges.
Dimensional coverage: Outside diameter, bolt circle, number and size of bolt holes, flange thickness, and raised face details.
Materials: Applicable to a wide range of steels, stainless steels, and alloys for pressure piping and mechanical applications.
BS 4504 was extensively used in the UK and Commonwealth countries for oil & gas, petrochemical, power generation, and general engineering projects. It has since been technically aligned with the European standard EN 1092-1, but is still commonly referenced in many international projects and procurement specifications.
Catalog
- Dimensions of PN 2,5 flanges
- Dimensions of PN 6 flanges
- Dimensions of PN 10 flanges
- Dimensions of PN 16 flanges
- Dimensions of PN 25 flanges
- Dimensions of PN 40 flanges
- Dimensions of PN 63 flanges
- Dimensions of PN 100 flanges
- Dimensions of PN 160 flanges
- Dimensions of PN 250 flanges
- Dimensions of PN 320 flanges
- Dimensions of PN 400 flanges
Have You Any Question?
What to do if Mixed Materials are found in the project?
When materials get mixed up, it’s like building a Lego set with wrong pieces eventually everything falls apart.
The only viable solution requires 100% PMI testing on every individual flange using calibrated XRF analyzers, eliminating material certification risks through a certified processes.
Every factory out there claims they check their flanges with those XRF guns Piece by Piece. In all of Tsingshan Group’s backyard, only 3 manufacturers actually full-test every piece. We’re one of them.
Why Small Foundries happen the mix-ups?
These monster forging machines won’t start unless you order over 15 tons , like buying 100 pens when you need 10 . Factories have to mash together different steel batches.
Keeping materials separate costs small foundries 28% extra, like trying to sort Legos with a toddler wrecking them daily.
6/10 suppliers can’t track materials properly, it’s shipping mystery boxes that’ll bite us when things go wrong.
What is the standard lead time for orders? How do you handle delays caused by emergencies (e.g., pandemics, logistics disruptions)?
The standard lead time is 1 week, adjusted based on product complexity and order volume.
For unexpected risks, we implement the following measures:
—-Maintain backup suppliers and diversified logistics channels.
—-Monitor supply chain status in real time and provide early warnings to customers.
—-Prioritize critical orders and offer expedited service options.
What specific quality control steps are implemented during production?
Three-tier QC system:
—-Incoming Quality Control (IQC): Verify raw material specifications and certifications.
—-In-Process Quality Control (IPQC): Sample-test key parameters at each production stage.
—-Outgoing Quality Control (OQC): 100% visual/functional inspection, packaging checks, and destructive testing on samples.
—-Use SPC (Statistical Process Control) and automated inspection tools to ensure consistency.
How do you continuously improve product quality and on-time delivery rates?
Data-driven approach: Monthly analysis of customer complaints, return rates, and delivery performance.
PDCA Cycle (Plan-Do-Check-Act): Implement process upgrades or supplier training based on findings.
Closed-loop feedback: Regularly survey customer satisfaction and integrate results into KPI evaluations.
Intended Use: Suitable for supplier manuals, contract annexes, official websites, or sales communication to enhance client trust and reduce collaboration friction.