ISO 12628:2022

Overview

ISO 12628:2022 specifies test equipment and procedures for determining the dimensions, squareness and linearity of preformed pipe insulation used in building equipment and industrial installations. Applicable to thermal insulating products supplied as one piece, half sections or segments, this international standard defines how to measure circumference, outside and inside diameter, wall thickness, length, deviation from squareness and deviation from linearity to support consistent quality assessment and conformity checking.

Key Topics

• Scope and terms: Definitions for circumference, outside/inside diameter, thickness, length, thickness uniformity, deviation from squareness and deviation from linearity, plus inner and outer chords for segments.
• Apparatus requirements: Typical instruments include metal tape measures, metal pipe supports, racks, thickness gauges (0.5 N load distributing plate), conical mandrels, calipers, metal squares and flat reference surfaces. Stated accuracy examples: caliper 0.1 mm, thickness gauge/readings 0.5 mm, diameter reading 1 mm, circumference reading 3 mm.
• Test specimens: Tests use full-size products where possible; half sections or segments may be joined with tape. Minimum piece size when divided is 100 mm. Number of specimens is defined by the product standard or, if unspecified, at least three.
• Conditioning and test conditions: Standard ambient conditioning is (23 ± 5) °C (or dispute case: 23 ± 2 °C and 50 ± 5 % RH). Tropical conditions may use (27 ± 5) °C and (65 ± 5) % RH.
• Measurement procedures: Options for paired measurements (e.g., circumference and inside diameter; inside and outside diameter; thickness plus one diameter) ensure thickness and concentricity assessment. Procedures cover circumference, diameters, thickness uniformity, length, squareness and linearity, plus chord measurement for segments.
• Results and reporting: Clauses define calculation, expression of results, measurement accuracy and required content of the test report.

Applications

ISO 12628:2022 is used for:

• Manufacturers - production control, acceptance testing and product specification verification for preformed pipe insulation.
• Testing laboratories - standardized test methods for certification and quality assurance.
• Specifiers and procurement - verifying dimensional tolerances and installation fit for mechanical services and industrial piping.
• Installers and inspection bodies - on-site acceptance checks and conformity assessment to ensure proper fit, thermal performance and installation integrity.

Adopting ISO 12628 helps reduce installation errors, improve insulation performance predictability, and harmonize test data across suppliers.

Related Standards

• This edition merges and replaces earlier documents (ISO 12628:2011 and EN 13467:2018) and was prepared by ISO/TC 163 in collaboration with CEN/TC 88. Users should consult relevant product standards for specimen counts and any additional product-specific requirements.