BS EN 1857-2010 pdf download.Chimneys Components Concrete flue liners.
The maximum and minimum internal transverse dimensions of the flue liner shall be those calculated from the manufacturer’s declared tolerances and the tolerances specified in 7.1. If direct measurement is to be carried out, two measurements should be taken at the observed maximum and minimum diameters.
The test also can be carried out using two gauges whose diameters are set at the minimum and maximum diameters. The minimum gauge should be able to be turned through 3600 within the whole length of the flue liner. The maximum gauge should not be able to enter the flue liner when turned through a rotation of 3600.
Fo- square and rectangular flue liners, the internal transverse dimensions shall be measured between the mid points of opposite sides of the flue liner.
A.1.2 Declared height
The maximum and minimum declared heights of a flue liner shall be those calculated from the manufacturer’s declared dimensions and the tolerances specified in 7.1. If direct measurement is to be carried out, two measurements should be taken at the observed maximum and minimum internal heights.
The test can also be carried out by using two gauges whose heights are set at the minimum and maximum internal heights. The minimum gauge should not be able to fit over the internal height of the flue liner. The maximum gauge should be able to fit over the internal height of the flue liner.
A.1.3 Wall thickness
The maximum and minimum wall thickness dimensions shall be those calculated from the manufacturer’s declared dimensions and the tolerances specified in 7.1 or direct measurement is to be carried out at the observed maximum and minimum thickness.
A.2 Straightness test
A.2.1 Apparatus
A straightness measuring device, such as a straight edge. having a length 100 mm less than the nominal
height of the flue liner under test.
A.2.2 Procedure
A.2.2.1 Place the measuring device along the line HT as shown in Figure Al.
A.2.2.2 Measure the maximum distance from the centre of the straight line created by the apparatus in
A.2. 1 spanning any concave curve on the outside of the flue liner to the flue liner surface (Os) as shown in
Figure A.l.
A heat generator capable of delivering completely combusted hot gas at the test temperature specified in Table 4, having a CO/CO2 ratio not greater than 0,01, with the appropriate volume flow for the cross section specified in Table A. 1.
The temperature of the products of combustion and the surface of the flue liner assembly shall be measured by a type K (Nickel-chromiumlNickel-aluminium) thermocouple, or similar, with an unsheathed junction located as shown in Figure A.3. The maximum deviations are ± 3 °C for temperatures up to 600 °C and ± 0,75 % for temperatures over 600 C.
A.4.2 Test assembly
Construct a test assembly of liners containing a minimum of one complete liner and two joints for flue liners less than or equal to 1,0 m manufacturer’s declared height to give a minimum overall height of 2.0 m jointed in accordance with the manufacturer’s instructions. Flue liners of manufacturers declared height greater than 1,0 m may be cut and the test assembly formed from two cut pieces, each having a height greater than 0.5 m and having only one joint near the centre of the assembly, jointed in accordance with the manufacturer’s instructions.
For thermal testing (heat stress and heat shock) the flue liner shall be insulated with a flexible material having a thermal resistance of (0,4 ± 0,04) m2 K at a temperature of 200 °C. The insulation material shall be capable of withstanding a temperature of (1 000 °C.
If a flue liner is further designated T by the manufacturer, the flue liner shall be tested without insulation.
A.4.3 Test environment and conditioning
A.4.3.1 Test room
The test room shall provide the following conditions:
a) ambient air temperature: 15 °C up to 30 °C;
b) draughts into the test room: ≤ 0,5 mIs:
NOTE This requirement Is assumed to be conformed to a closed room environment.
c) location of measurements: minimum height of 1,0 m above the floor and at least 1,0 m from the test room walls:
d) minimum distance between test chimneys and other structures (e.g. walls): 1.0 m:
e) free connecting space if the laboratory is divided in several levels.
These ambient air conditions are measured a maximum of 1,0 m from the test assembly.BS EN 1857-2010 pdf download.