EN 12881-1:2005+A1:2008

2003-01.Slovenski inštitut za standardizacijo. Razmnoževanje celote ali delov tega standarda ni dovoljeno.Conveyor belts - Fire simulation flammability testing - Part 1: Propane burner testsNRPCourroies transporteuses - Essais de simulation d'inflammation - Partie 1: Essais avec brûleur propaneFördergurte - Brandtechnische Prüfungen - Teil 1: Prüfungen mit dem Propanbrenner53.040.20Deli za transporterjeComponents for conveyors13.220.40Sposobnost vžiga in obnašanje materialov in proizvodov pri gorenjuIgnitability and burning behaviour of materials and productsICS:SIST EN 12881-1:2006+A1:2008en,frTa slovenski standard je istoveten z:EN 12881-1:2005+A1:200801-julij-2008SIST EN 12881-1:2006+A1:2008SLOVENSKI
STANDARD
EUROPEAN STANDARD NORME EUROPÉENNE EUROPÄISCHE NORM
EN 12881-1:2005+A1
April 2008 ICS 13.220.40; 53.040.20 Supersedes EN 12881-1:2005 English Version
Conveyor belts - Fire simulation flammability testing - Part 1: Propane burner tests
Courroies transporteuses - Essais de simulation d'inflammation - Partie 1: Essais avec brûleur propane
Fördergurte - Brandtechnische Prüfungen - Teil 1: Prüfungen mit dem Propanbrenner This European Standard was approved by CEN on 26 August 2005 and includes Amendment 1 approved by CEN on 21 February 2008.
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 CEN 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 CEN Management Centre has the same status as the official versions.
CEN members are the national standards bodies of Austria, Belgium, Bulgaria, Cyprus, Czech Republic, Denmark, Estonia, Finland, France, Germany, Greece, Hungary, Iceland, Ireland, Italy, Latvia, Lithuania, Luxembourg, Malta, Netherlands, Norway, Poland, Portugal, Romania, Slovakia, Slovenia, Spain, Sweden, Switzerland and United Kingdom.
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B-1050 Brussels © 2008 CEN All rights of exploitation in any form and by any means reserved worldwide for CEN national Members. Ref. No. EN 12881-1:2005+A1:2008: E

Relationship between this European Standard and the Essential Requirements of EU Directive 98/37/EC.27 Annex ZB (informative)
!!!!Relationship between this European Standard and the Essential Requirements of EU Directive 2006/42/EC"""".28 Bibliography.29

It is therefore essential to conduct the tests with caution, having due regard to health and safety considerations and to terminate any test immediately if at any time it is considered advisable to do so.
In this regard it is recommended that no test should be supervised by only one person.

1 Scope This part of EN 12881 describes three methods for measuring the propagation of a flame along a conveyor belt which has been exposed to a relatively high localised heat source such as a fire. The damage suffered by the conveyor belt, as well as its tendency to support combustion, are measured by observing the extent to which the fire spreads along the test piece. Method A uses a test piece 2 m in length and consumes propane gas through the burner at the rate of (1,30 ± 0,05) kg per 10 min. Method B uses a test piece 2,5 m in length and consumes propane gas through two burners mounted above and below the test piece trestle at the rate of (1,30 ± 0,05) kg per 10 min for each burner. Method C uses a test piece 1,5 m in length and consumes propane gas through the burner at the rate of (565 ± 10) g per 50 min. 2 Normative references The following referenced documents are indispensable for the application of this European Standard. For dated references, only the edition cited applies. For undated references, the latest edition of the referenced document (including any amendments) applies. EN 10088-3, Stainless steels - Part 3: Technical delivery conditions for semi-finished products, bars, rods, wire, sections and bright products of corrosion resisting steels for general purposes. EN 22768-1:1993, General tolerances - Part 1: Tolerances for linear and angular dimensions without individual tolerance indications (ISO 2768-1:1989). ISO 65, Carbon steel tubes suitable for screwing in accordance with ISO 7-1. ISO 9162:1989, Petroleum products – Fuels (Class F) – Liquefied petroleum gases – Specifications. 3 Propane gas supply The burners used in each method shall be supplied from bottled propane gas complying with ISO 9162 which shall be fed to each burner, using high pressure propane hose having a minimum internal diameter of 6,3 mm, either: a) through a pressure reducing valve, a non-return valve and an orifice plate 1,7 mm thick with a 2,5 mm diameter hole; or b) through a pressure reducing valve and a non-return valve followed by a flowmeter calibrated to ensure that the correct mass of gas is consumed. Before and during the test, immerse each gas cylinder to approximately two-thirds of its height in a bath of water at a temperature of (25 ± 3) °C. Ensure that each gas cylinder is not emptied at the end of a test by more than 90 % of its gas mass capacity.

(450 ± 9) mm and an overall height of (220 ± 5) mm. The burner shall be made of welded steel tube complying with ISO 65, having a bore designation of DN 15 medium or heavy series. The tubing shall have
52 holes, each having a diameter of (1,5 ± 0,1) mm, spaced at 50 mm intervals. 4.1.4 Anemometer, or other means of measuring the air velocity in the gallery, which shall be located at a height of 350 mm on the centreline of the gallery, at least 7,25 m inside the gallery entrance and 750 mm from the end of the trestle nearest the gallery entrance. NOTE It is important that the air flow in the gallery is laminar and to this end equipment to assist in producing laminar flow may be used. 4.1.5 Thermocouple, to measure the temperature of the incoming air, located as shown in Figure 1.

a) Plan view of gallery
b) Cross-section of front of gallery Key 1 Rear of gallery 2 Position of thermocouple on centre line 3 Front of gallery Figure 1 — Location of thermocouple for measuring the temperature of incoming air

Key 1 Direction of air flow
9 Test piece 2 Additional bar
10 Edge of test piece flush with front of trestle 3 To be clear of any cross bracing
11 350 mm to flow line 4 Propane burner
12 Rod retainers 5 DN 15 heavy series tube
13 DN 15 heavy series trestle 6 Detail of trestle
14 Detail of rod retaining angle 7 Bars made of austenitic chrome/nickel steel,
diameter 10 mm, length 1,4 m 8 Gallery entrance Figure 2 — Propane burner trestle showing positions of burner and test piece

=
(450 ±9)220 ±5
a) Elevation 250 x 9 = 450
b) Plan view Key 1 Threaded 2 Hole (x 52) Figure 3 — Burner for Method A 4.2 Preparation of test pieces Cut two test pieces, each 2 m long × 1 200 mm wide or of full width if the conveyor belt is less than
1 200 mm wide. Lay the test pieces out for 24 h in dry conditions at any ambient temperature above 0 °C immediately prior to testing to remove residual curvature. 4.3 Temperature at commencement of test The ambient temperature at the commencement of the test shall be between 5 °C and 30 °C. 4.4 Number of tests Carry out two tests, one on each side of the belt, so that both covers are tested.
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