SIST EN 818-7:2002

SLOVENSKI STANDARD
01-november-2002
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Short link chain for lifting purposes - Safety - Part 7: Fine tolerance hoist chain, Grade T
(Types T, DAT and DT)
Kurzgliedrige Rundstahlketten für Hebezwecke - Sicherheit - Teil 7: Feintolerierte
Hebezeugketten, Güteklasse T (Ausführung T, DAT und DT)
Chaînes de levage a maillons courts - Sécurité - Partie 7: Chaînes de tolérance serrée
pour les palans, classe T (Types T, DAT et DT)
Ta slovenski standard je istoveten z: EN 818-7:2002
ICS:
53.020.30 Pribor za dvigalno opremo Accessories for lifting
equipment
2003-01.Slovenski inštitut za standardizacijo. Razmnoževanje celote ali delov tega standarda ni dovoljeno.

EUROPEAN STANDARD
EN 818-7
NORME EUROPÉENNE
EUROPÄISCHE NORM
February 2002
ICS 53.020.30
English version
Short link chain for lifting purposes - Safety - Part 7: Fine
tolerance hoist chain, Grade T (Types T, DAT and DT)
Chaînes de levage à maillons courts - Sécurité - Partie 7: Kurzgliedrige Rundstahlketten für Hebezwecke - Sicherheit
Chaînes de tolérance serrée pour les palans, classe T - Teil 7: Feintolerierte Hebezeugketten, Güteklasse T
(Types T, DAT et DT) (Ausführung T, DAT und DT)
This European Standard was approved by CEN on 8 November 2001.
CEN members are bound to comply with the CEN/CENELEC Internal Regulations which stipulate the conditions for giving this European
Standard the status of a national standard without any alteration. Up-to-date lists and bibliographical references concerning such national
standards may be obtained on application to the Management Centre or to any CEN member.
This European Standard exists in three official versions (English, French, German). A version in any other language made by translation
under the responsibility of a CEN member into its own language and notified to the Management Centre has the same status as the official
versions.
CEN members are the national standards bodies of Austria, Belgium, Czech Republic, Denmark, Finland, France, Germany, Greece,
Iceland, Ireland, Italy, Luxembourg, Malta, Netherlands, Norway, Portugal, Spain, Sweden, Switzerland and United Kingdom.
EUROPEAN COMMITTEE FOR STANDARDIZATION
COMITÉ EUROPÉEN DE NORMALISATION
EUROPÄISCHES KOMITEE FÜR NORMUNG
Management Centre: rue de Stassart, 36  B-1050 Brussels
© 2002 CEN All rights of exploitation in any form and by any means reserved Ref. No. EN 818-7:2002 E
worldwide for CEN national Members.

Contents
page
Foreword .3
Introduction .4
1 Scope.4
2 Normative references.5
3 Terms and definitions.5
4 Hazards .6
5 Safety requirements.7
6 Verification of safety requirements.14
7 Marking.18
8 Manufacturer's certificate.18
9 Information for use and assembly of the hoist chain into the hoist.18
Annex A (normative)  Calculation of dimensions, working load limits and mechanical
properties.20
Annex B (normative)  Selection criteria for fine tolerance chain for power driven hoists.
Types T, DAT and DT .23
Annex C (informative)  Designation system for hoist chain - grade T .31
Annex D (informative)  Approximate mass of Grade T hoist chain .32
Annex E (informative)  Chain use .33
Annex ZA (informative)  Relationship of this document with EC Directives.34
Bibliography.35
Foreword
This document EN 818-7:2002 has been prepared by Technical Committee CEN /TC 168 "Chains,
ropes, webbings, slings and accessories", the secretariat of which is held by BSI.
This European Standard shall be given the status of a national standard, either by publication of an
identical text or by endorsement, at the latest by August 2002, and conflicting national standards shall
be withdrawn at the latest by August 2002.
This document has been prepared under a mandate given to CEN by the European Commission and
the European Free Trade Association, and supports essential requirements of EC Directive(s).
For relationship with EC Directive(s), see informative annex ZA, which is an integral part of this
document.
The other parts of EN 818 are:
Part 1: General conditions of acceptance
Part 2: Medium tolerance chain for chain slings - Grade 8
Part 3: Medium tolerance chain for chain slings - Grade 4
Part 4: Chain slings - Grade 8
Part 5: Chain slings - Grade 4
Part 6: Chain slings - Specification for information for use and maintenance to be provided by
the manufacturer.
This is the first edition of this part of EN 818.
The annexes A and B are normative. The annexes C, D, E and ZA are informative.
According to the CEN/CENELEC Internal Regulations, the national standards organizations of the
following countries are bound to implement this European Standard: Austria, Belgium, Czech
Republic, Denmark, Finland, France, Germany, Greece, Iceland, Ireland, Italy, Luxembourg, Malta,
Netherlands, Norway, Portugal, Spain, Sweden, Switzerland and the United Kingdom.
Introduction
This European Standard has been prepared to be a harmonized standard to provide one means of
conforming with the essential safety requirements of the Machinery Directive and associated EFTA
regulations.
These chains are intended for use in serial hoists. The multiple pitch is fine toleranced.
The extent to which hazards are covered is indicated in the scope of this European Standard. In
addition, lifting equipment should conform as appropriate to EN 292 for hazards which are not
covered by this standard.
Annex A is normative and gives the bases for the calculation of the dimensions and the mechanical
properties of hoist chains.
Annex B is normative and gives selection criteria for the nominal size of hoist chains, Grade T, types T,
DAT and DT for serial hoists.
Annex C is informative and gives a designation system for recording the identifying features of fine
tolerance short link chain Grade T. Since this system is not widely used it has been included in this
first edition of this standard as an informative annex; however, should its use become more generally
accepted then the status of the information would need to be reviewed.
1 Scope
This European Standard specifies the requirements related to safety for hoist chain, Grade T (type T
quenched and tempered and types DAT and DT case hardened), for use in serial chain hoists manual
and power driven.
Type DAT and type DT hoist chains possess surface hardnesses greater than core hardness and are
used for power driven chain hoists to offer greater resistance to wear.
Type DT hoist chain differs from DAT hoist chain in having higher surface hardness and/or greater case
depth to optimise wear resistance.
The standard is applicable to electrically welded round steel short link hoist chains conforming to
EN 818-1.
The range of nominal size of hoist chains covered by this European Standard is from 4 mm to 22 mm.
The hazards covered by this European Standard are identified in clause 4.
2 Normative references
This European Standard incorporates, by dated or undated reference provisions from other publications.
These normative references are cited at the appropriate places in the text, and the publications are listed
hereafter. For dated references, subsequent amendments to or revisions of any of these publications
apply to this European Standard only when incorporated in it by amendment or revision. For undated
references, the latest edition of the publication referred to applies (including amendments).
EN 292-1:1991, Safety of machinery – Basic concepts – General principles for design – Part 1: Basic
terminology, methodology.
EN 292-2:1991/A1:1995, Safety of machinery – Basic concepts – General principles for design – Part 2:
Technical principles and specifications.
EN 818-1:1996, Short link chain for lifting purposes – Safety – Part 1: General conditions of acceptance.
EN 1050:1996, Safety of machinery – Principles for risk assessment.
EN ISO 7500-1, Metallic materials - Verification of static uniaxial testing machines - Part 1:
Tension/compression testing machines (ISO 7500-1:1999).
EN 10025, Hot rolled products of non-alloy structural steels; technical delivery conditions (includes
amendment A1:1993).
ISO 643, Steels – Micrographic determination of the ferritic or austenitic grain size.
ISO 4301-1, Cranes and lifting appliances – Classification – Part 1: General.
ISO 6507-1, Metallic materials – Vickers hardness test – Part 1: Test method.
ISO 4965, Axial load fatigue testing machines - Dynamic force calibration - Strain gauge technique.
3 Terms and definitions
For the purposes of this European Standard the terms, definitions and symbols given in EN 818-1 apply.
4 Hazards
The release of a load due to failure of hoist chain puts at risk either directly or indirectly the safety or
health of those persons within the danger zone of lifting equipment.
In order to provide the necessary strength and durability of hoist chain, this European Standard lays down
requirements for the design, selection of materials of construction and testing to ensure that specified
levels of performance are met.
Fatigue failure has not been identified as a hazard for type T chain when hoist chain selected according
to annex B and having the specified levels of performance and design given in this European Standard is
used in serial hoists.
Fatigue failure has been identified as a hazard for hoist chains types DAT and DT used in power driven
hoists. Therefore this European Standard specifies levels of design and performance, with particular
reference to fatigue resistance.
Since failure can be caused by the incorrect choice of grades and specification of lifting hoist chain this
European Standard also gives the requirements for marking and the manufacturers certificate.
Dimensional incompatibility between the hoist chain and mating parts of the hoist (chain wheel, chain
guide and loading device) may lead to premature failure and this European Standard contains
dimensional requirements for correct assembly and fit.
Table 1 lists those hazards, which require action to reduce risk identified by risk assessment as being
specific and significant for hoist chain of Grade T Types T, DAT, DT.
Table 1 — Hazards and associated requirements
Hazards identified in annex A of Relevant clause of annex A of Relevant clause/subclause
EN 1050:1996 EN 292-2:1991/A1:1995 of this standard
1.e Mechanical hazard due to 1.3.2   } 5
inadequacy of strength 4.1.2.3 }
4.1.2.4 }
4.2.4 6
1.7.3   }
4.3.1   } 7
1.5 (Types DAT, DT only) - 5.5.6
Fatigue failure and 6.2.7
5 Safety requirements
5.1 General
The hoist chains shall conform to the requirements of EN 818-1.
5.2 Dimensions
5.2.1 General
A selection of nominal sizes and dimensions is given in 5.2.2 and 5.2.4. Other nominal sizes may be
used, provided that nominal sizes shall not exceed the range specified in 5.2.2 and that the dimensions
and tolerances are calculated in accordance with annex A.
Whilst the nominal link pitch p is based upon 3 d (where d is the nominal size of the hoist chains) this
n n n
may be varied but shall not exceed the limits 2,6 d to 3,2 d . The nominal link pitch p shall be subject to
n n n
the tolerances specified in annex A.
NOTE  Compatibility between the hoist chain and the mating parts of the hoist requires agreement on the
nominal size and dimensions and on the distribution of tolerances between the chain manufacturer and the hoist
manufacturer.
5.2.2 Nominal size d
n
The nominal size shall not be below 4 mm or above 22 mm, a selection of nominal sizes is listed in
Table 2.
5.2.3 Tolerances on material diameter
The tolerances on material diameter for the selected nominal sizes shall be as listed in Table 2. These
and all other nominal size material diameter tolerances shall be calculated in accordance with A.1.
5.2.4 Pitch and widths
The dimensions and tolerances of the 3 d pitch and the width for the selected nominal sizes shall be
n
as listed in Table 2. The dimensions and tolerances of the pitch and width shall be calculated in
accordance with A.1.
These dimensions and tolerances and all other nominal size and pitch ranges and tolerances of multiple
pitch lengths, shall be calculated in accordance with A.1.
The tolerances of multiple pitch lengths shall be calculated in accordance with A.1.
Table 2 — Selected dimensions
Dimensions in millimetres
Pitch Width Gauge length of Weld
11 x p diameter
n
1 1)
Nominal Material tolerance internal external tolerance d
s
size diameter w w
3 2
d tolerance p min. max. max.
n n
4 ± 0,2 12 0,25 4,8 13,6 132 0,6 4,3
...