BS/EN 13467-2018 pdf download.Thermal insulating products for building equipment and industrial installations – Determination of dimensions, squareness and linearity of preformed pipe insulation.
6.2 Number of test specimens
The number of test specimens shall be as specified in the relevant product standard. If the number is not specified, then at least three test specimens shall be used.
In the absence of a product standard or any other European technical specification the number of test specimens may be agreed between parties.
6.3 Conditioning of test specimens
The test specimens shall be stored for at least 611 at (23 ± 5) °C. In case of dispute they shall be stored at (23 ± 2) °C and (50 ± 5) % relative humidity for the time stated in the relevant product standard.
7 Procedure
7.1 Test conditions
The test shall be carried out at (23 ± 5) °C. In case of dispute it shall be carried out at (23 ± 2) °C and (50 ± 5) % relative humidity.
7.2 Test procedure
7.2.1 General
Determine the thickness, d, of the test specimen and its inside and outside diameter, D1 and D0, from one of the following methods (pairs of measurements):
a) outside circumference and inside diameter;
b) inside diameter and outside diameter;
c) inside diameter and thickness;
NOTE 2 Determination of deviation from squareness and deviation from linearity are not relevant for all materials and/or applications.
7.2.2 Circumference — outside diameter, inside diameter, wall thickness, inner chord
7.2.2.1 General
The appropriate apparatus, described In Clause 5. shall be used for the measurements below.
During the measurement any longitudinal joints shall be kept close together.
The pipe insulation shall not be visibly deformed due to the measuring process.
Measure pipe insulation, with a length smaller than or equal to 600 mm, at two locations, either at the ends or 100 mm from each end.
Measure pipe insulation, with a length larger than 600 mm, as above with one extra measurement for each additional 400 mm in length evenly distributed along the length, with a maximum of 5 measurements.
The pipe insulation may be cut into smaller pieces at appropriate locations to facilitate measurement. The reading accu racy of the measurements shall correspond to the accuracy of the apparatus.
7.2.2.2 Circumference — outside diameter
Measure the circumference, C, of the test specimen using a metal tape.
Measure the outside diameter, D0, using either a metal tape or a caliper. Each measurement shall consist of two readings at right angles to the longitudinal axis of the test specimen at the selected locations. The readings of the outside diameter shall also be made at right angles to each other.
7.2.2.3 Inside diameter
Measure the inside diameter, U, using either a metal tape or a caliper. Each measurement shall consist of two readings at right angles to the longitudinal axis of the test specimen at the selected locations. The readings of the inside diameter shall also be made at right angles to each other.
Alternatively the inside diameter may be measured with a conical mandrel moved into position along the major axis of the pipe insulation.
NOTE For inside diameter greater than 55 mm the use of a conical mandrel can be impractical.
For circular segments, measure the inner chord, ch, and use this dimension for calculation of the inner diameter according to the formula in Table 1.
7.2.2.4 Thickness
Measure the thickness, d, using either a metal tape, a caliper or a thickness gauge. Each measurement shall consist of four readings at right angles to each other at the selected locations (d1, d 2, d and d4, see Figure 1).
When a thickness gauge is used on a metal pipe (see 511.2) the pipe insulation shall be supported (see Figure 3). Before making measurements on the pipe insulation the thickness gauge shall be read with the measuring plate resting on the metal pipe. The pipe insulation shall then be suspended on the metal pipe and the thickness gauge read again. The difference between the two measurements is the thickness of the test specimen at that location. The load distributing plate of the thickness gauge shall be raised between each new reading.
7.2.2.5 Thickness uniformity
Determine the deviation from thickness uniformity, Ad, at each location by deducting the lower reading
of thickness from the higher reading.
7.2.3 Length
Place the pipe insulation on a flat surface. Measure the length, I, twice, using a metal tape, at diametrically opposite sides on the surface of the pipe insulation (see Figurel).
The length Is measured with an accuracy of 1 mm for length s 600 mm and an accuracy of 2 mm for length > 600 mm.
7.2.4 Deviation from squareness
Place the pipe insulation on a flat surface. Place the metal square on the flat surface against the end of the pipe insulation (see Ejgure). Measure the deviation from squareness, v, as the maximum distance from the top edge of the pipe insulation to the metal square. It is measured with a metal tape by rotating the pipe insulation until the point is reached where the distance between the metal square and the pipe insulation is a maximum. The measurement is carried out at both ends of the pipe insulation.
The deviation from squareness is measured with an accuracy of 1 mm.
7.2.5 Deviation from linearity
Place the pipe insulation on a flat surface and rotate it until a gap is observed between the pipe Insulation and the flat surface. Measure the deviation from linearity, L, when the gap is at maximum using either a metal tape or a thickness gauge (see Figure 6) with an accuracy of 1 mm.BS/EN 13467-2018 pdf download.