EN 14638-3-2010 pdf download.Transportable gas cylinders – Refillable welded receptacles of a capacity not exceeding 150 litres – Part 3: Welded carbon steel cylinders made to a design justified by experimental methods.
The frequency of reversals of pressure shall not exceed 5 cycles/mm. The temperature measured on the outside surface of the cylinder shall not exceed 50 C during the test.
After the test, one cylinder shall be sectioned to measure the profile and to ascertain that this profile is sufficiently close to that in the described design, to the satisfaction of the inspection body.
The second cylinder shall be subjected to a burst test in accordance with E)8. 1 .7.I
7.2.4 Impact test
7.2.4.1 General
7.2.4.1.1 The integrity of the cylinder shell, of the specified thickness(es). materials and mechanical properties, to withstand loadings other than internal pressure shall be demonstrated by a series of impact tests.
The specified impact energy and striking velocity shall be achieved by striking the test cylinder with a moving striker or by dropping the cylinder from an appropriate height. In all cases, the location of the impact shall be as specified In the test procedure and the direction of impact shall pass through the axis of the cylinder.
The strikers (flat surface and edge) shall be of metallic material having a hardness that is higher than that of the cylinder and sufficiently robust to prevent the impact energy being absorbed by deflection of the striker.
7.2.4.1.2 The cylinders tested shall have representative minimum thickness and shall be completely finished induding the permanent protective devices.
7.2.4.1.3 The cylinders shall be filled with water so that the total mass corresponds to at least the tare of the cylinder, plus the mass of the maximum content specified by the manufacturer (gross weight of gas cylinders) or reach this weight through an effective system. In no case shall the total contents of the cylinders exceed 95 % of the water capacity. Cylinders used for permanent gases shall be filled with water to 40 % of the water capacity of the cylinder. In neither case shall the cylinder be pressurized for the
j)impact test. (J
7.2.4.1.4 The choice of the impact areas of the cylinder shall correspond to the most critical zones, taking into account the shape of the cylinder, the protective elements and the foreseen handling systems. Consideration shall be given to areas of minimum thickness, welds, areas hardened due to deformation. The impact areas selected shall be agreed with the parties and recorded in the test report.
7.2.4.2 FIat surface impact test
The striker shall be a flat surface with a length equal to the overall cylinder length and width equal to the cylinder diameter.
Two un-pressunsed cylinders shall be impacted at five different positions in accordance with 7,2.4.1.4.
The tests shall be repeated with two further cylinders. These cylinders shall be pressurised with compressed air or any other inert gas to the maximum working pressure or 5 bar, whichever is the lower.
NOTE Appropnate measures should be taken (e.g. in a cage) to ensure safe operation and to contain any energy that may be released. which is considerably more than that In the hydrauhc test.
If the cylinders withstand all of the impacts without leakage and with damage in excess of the criteria listed inEInnex C of EN 18O3:20O2(]. then on completion of the impacts, both cylinders shall be subjected only to a burst test. The results shall be satisfactory when the burst pressure Pb.> 1.3 p,.1.
If the cylinders withstand all of the impacts with visible damage below the rejection criteria (see IAnnex C of EN 1803:20O2J), then on completion of the impacts, one cylinder subject to a fatigue test in accordance with 7.2.3 but with only 6 000 cycles and one cylinder shall be subjected to a burst test in accordance with 8.2.1.
7.2.4.3 Edge impact test
The impact energy, F, shall be determined by
F=12M
where
F Is the energy, in Joules;
if is the maximum operating mass of the cylinder, in kg. The striking velocity. v, shall be between 4 m/s and 5 m/s.
Two un-pressurised cylinders shall each be impacted with the edge parallel to the cylinder axis (see Figure 3). The cylinders shall then be impacted with the edge perpendicular to the cylinder axis. The tests shall be repeated with two further cylinders. These cylinders shall be pressurised with compressed air, or any other inert gas, to the maximum working pressure or 5 bar, whichever is the lower.
NOTE Appropriate measures should be taken (e.g. in a cage) to ensure safe operation and to contain any energy that may be released, which is considerably more than that in the hydraulic test.
If the cylinders withstand all of the impacts without leakage and with damage in excess of the criteria listed inEj)Annex C of EN 1803:2002(jI then on completion of the impacts, both cylinders shall be subjected only to a burst test. The results shall be satisfactory when the burst pressure Pb.> 1,3 ph.EN 14638-3-2010 pdf download.

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