Pipe Standards & Specifications

Pipe Threads

The machined threads of Crane Fluid Systems fittings are supplied to conform with the gauging requirements of BS EN 10226-2 and BS 21. Threads on all fittings are chamfered to assist assembly and avoid ‘cross threading’. Female fittings have a chamber behind the thread, permitting the male thread to be assembled without restriction or ‘bottoming’.

Design Standards

ISO 49:1994 is the international standard for ‘Malleable cast iron fittings’ threaded to ISO 7-1. This standard was revised in December 1994 and, compared with the 1983 edition, contained some technical revisions relating to use of alternative ferrous materials, hot dip zinc coatings, dispatch condition, pressure/temperature ratings, acceptance tests, marking and quality assurance. BS EN 10242:1995 is the new British European Standard for ‘Threaded pipe fittings in malleable cast iron’ first published in August 1995 and very closely follows ISO 49:1994, the main difference being the inclusion of two informative annexes relating to ‘Assessment of conformity’ and the ‘Relationship with the essential requirements of the Construction Products Directive (84/106/EEC)’.

All European Standards have to be adopted by the member countries of the EU and any conflicting national standards withdrawn. BS 143 and 1256:2000 has been retained to cover those fittings not in BS EN 10242. It should also be noted that BS EN 10242 details a number of fitting types and sizes which were not included in BS 143 & 1256 because they were not in regular demand and/or not available from UK manufacturers. BS 143 & 1256:2000 specifies requirements for the design and performance of ‘Malleable cast iron and cast copper alloy threaded pipe fittings’ and has developed over many years. BS 143 was first published in 1922 and BS 1256 in 1945, subsequently the two standards were combined in 1968. The BS 143 design requires fittings to have taper external threads and taper internal threads conforming to BS EN 10226 whereas the BS 1256 design has taper external threads and parallel internal threads. The 1986 revision was more closely related to ISO 49:1983 and more accurately reflected the ranges of fittings available from UK manufacturers. BS 143 & 1256 has always been technically more demanding than ISO 49 and consequently BS EN 10242.

BS 143 & 1256 were amended in August 1995 to delete those fittings now covered by BS EN 10242, so the scope of BS 143 & 1256 is now essentially:

  1. BS 143 design and BS 1256 design fittings in malleable iron not covered by BS EN 10242,
  2. BS 143 design fittings threaded to ANSI B1.20.1 (NPT)

Conformance of Crane FS Fittings

Both malleable iron and steel fittings have been verified by the British Standards Institute (BSI) as conforming to BS EN 10242 and BS 143 & 1256, as appropriate, and as such are permitted to bear the British Standards Kitemark Logo - Kitemark Licence No. KM00382.

Some small size fittings are manufactured in steel and will conform to BS EN 10241.

UL Certified Products

Many malleable fittings are covered by UL certification. UL is a global leader in testing, inspection, certification, auditing and validation. UL Listing means that UL has tested representative samples of the product and determined that it meets UL’s requirements. These requirements are based primarily on UL’s published and nationally recognised Standards for Safety. UL approved fittings have been approved for use in fire protection such as sprinkler systems. Malleable Fittings Covered:

140, 144, 145, 146, 147, 148, 149, 150, 151, 152, 155, 156, 161, 171, 177, 185, 192, 193, 197, 199.

Constructed of blackheart malleable iron according to Standard BS EN 1562:1997, Grade EN-GJMB-300-6 Fittings may also utilise an optional zinc coating (galvanised) as described in BS EN 10242:1995, Sec. 5.2.

For the details of the fittings range covered see the UL Certifications Directory at: https://www.ul.com/database

The Pressure Equipment Directive 97/23/Ec (PED)

The Directive applies to the design, manufacture and conformity of pressure equipment and assemblies of pressure equipment with a maximum allowable pressure greater than 0.5 bar. Individual piping components, such as fittings, are excluded from the scope of the Directive and therefore cannot be CE marked. However, Crane FS pipe fittings are manufactured to the appropriate European standards and satisfy the essential safety requirements of the PED.

A ‘Certificate of Incorporation for Pipe Fittings’ can be accessed on the website, or will be provided on request from Crane FS.

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