BS EN 10311:2005 is the British and European standard that defines requirements for joints used to connect steel tubes and fittings, specifically for the conveyance of water and other aqueous liquids. BSI Knowledge Scope and Purpose
The standard provides a comprehensive framework for the classification, requirements, and testing of various jointing methods for low-alloy and non-alloy steel tubular products. Its primary goal is to ensure the strength and integrity
of these connections to improve the durability and longevity of water transport systems. iTeh Standards Key Joint Types Defined
The standard specifies several methods for connecting tubes and fittings: Butt Welded Joints
: Made between tubes or fittings with ends prepared according to Welded Spigot and Socket (Sleeve) Joints
: Features a parallel spigot end and a sleeve end that can be parallel or slightly tapered. : Both the spigot and sleeve ends are parallel. Welded Collars
: Provides specific examples and requirements for pipe collars. Flange Joints : Standards for mechanical flange connections. iTeh Standards Relationship with Other Standards BS EN 10224
: This standard is often used in conjunction with BS EN 10311. Together, they superseded the older BS 534:1990 Potable Water Regulations
: While it covers joints for aqueous liquids, users must still comply with national regulations for materials in contact with drinking water, as BS EN 10311 does not provide specific restrictions for every EU/EFTA state. Standard Structure
The document is typically organized into the following sections for technical reference: Normative References for symbols) Terms, Definitions, and Symbols Types of Joint Classification Requirements and Testing Evaluation of Conformity iTeh Standards
For procurement or technical compliance, the official document can be accessed through the BSI Knowledge portal or authorized standards resellers like iTeh Standards specific testing requirements for these joints or how they compare to the superseded BS 534 SIST-EN-10311-2005.pdf - iTeh Standards 25 Mar 2005 —
BS EN 10311:2005 is the European standard that defines the methods and requirements for connecting non-alloy steel tubes and fittings used specifically for conveying water and other aqueous liquids . It provides a standardized framework for the strength, integrity, and testing of these joints to ensure they can withstand long-term operational pressure without leaking or failing . Scope and Purpose
The standard is a critical tool for pipeline designers, civil engineers, and manufacturers. Its primary goals include:
Defining Jointing Methods: It covers a specific range of joint types, including butt welded, flange, threaded, and mechanical couplings .
Ensuring Water Quality: It is suitable for systems carrying water intended for human consumption, provided appropriate coatings are applied .
Performance Verification: It establishes testing procedures to verify that a joint will maintain its performance over time under foreseeable stresses . Key Joint Types Covered
The standard details several connection methods, each suited for different installation needs:
Welded Joints: Includes butt welded joints and welded spigot and socket (sleeve) joints. For pipes over 711 mm in diameter, welding can be performed inside, outside, or both .
Flange Joints: These must follow the design and dimensions specified in EN 1092-1 or EN 1759-1 .
Mechanical Couplings: Covers slip-on, grooved, and shouldered couplings designed for quick assembly .
Threaded Joints: Utilizes specific thread standards, typically referencing the EN 10226 series . Critical Limitations
Users of BS EN 10311 should be aware of what the standard does not cover:
Tube Materials: It specifies jointing methods but does not define the material or dimensional requirements for the tubes themselves (which are typically covered by BS EN 10224) .
High-Temperature Systems: It is not intended for heating networks where high-temperature resistance is required .
Flexible Joints: Joints that allow for significant angular deflection or center-line offsets are explicitly excluded . Availability of the PDF
Official copies of the standard in PDF format can be purchased through authorized national standards bodies such as the BSI Knowledge store or the ANSI Webstore . These versions often include Digital Rights Management (DRM) to prevent unauthorized distribution . BS EN 10311:2005 - BSI Knowledge
Based on the standard designation BS EN 10311, here are the key features and characteristics of this document.
BS EN 10311 is the British/European standard titled: "Joints for the connection of steel tubes and fittings for the conveyance of fluids."
BS EN 10311:2005 (current version) is titled: "Steel tubes and fittings for onshore and offshore pipelines - Joints for steel pipelines and fittings - Qualification of jointing procedures."
This standard specifies the requirements for the qualification of jointing procedures for metallic materials used in pipelines. It covers a wide range of jointing methods, including:
The standard applies to pipelines used for the conveyance of fluids (liquids, gases, or slurries) under pressure. It is commonly cited in the water, gas, oil, and chemical processing industries.
Pipelines fail most often at joints. Reasons include poor fit-up, incorrect welding procedures, inadequate inspection, or selection of a joint type unsuited to the operating environment. BS EN 10311 addresses these issues by mandating a structured approach to:
For companies operating under the Pressure Equipment Directive (PED) 2014/68/EU or the Construction Products Regulation (CPR), compliance with BS EN 10311 is often cited as a presumed conformity route for joints.