Agricultural and forestry machinery

BS EN 909:1999 pdf free.Agricultural and forestry machinery—Centre pivot and moving lateral types irrigation machines—Safety.
3 Definitions For the purpose of this standard, the definitions given in EN 292-1:1991 and EN 292-2: 1991 apply together with the following.
irngation machine constiluted of a long length pipe supported by towers equipped with wheels iluiven by motors, including a fixed point where water and energy arrive
NOTE This irnganon rnachiiw can be used eilher on a complete circle or on a circle quadrant. It can he movable Le. the pivot point can inoi, fnm a working twaduon to a new working position, during the moveriwflt the watenng IS stopped.
pivot point fixed point from which the rotation of the whole machine is performed
NOTE It is characterized by a structure fixed on a concrew flagstone leaving the machine free to ru(ate. Here feeding of water and energy are perfonued.
3.3 moving lateral sprinkling lateral built on the same pnncipal as centre pivot, the displacement of which is lateral (translatory motion)
NOTE The control tower receives or pumps the waler and receives or produces its own electrical energy.
3.4 control tower in the case of a movable system, tower wiuch initiates the movement of the whole sprinkling lateral
NOTE It can be situated In the centre of the lateral or at one of the ends and be equipped with two or four wheeb. some of them could be driving and pce.ibIy steering.
3.5 irrigation gun large sprinkler with slow motion return used at the end of an inigation machine generally watering a sector.
4 Safety requirements andor measures
4.1 General
The machines shall comply as appropriate with EN 292 for hazards which are not dealt with and especially with EN 292-2: 1991/A1:1995, annex A when EN 292 does not give precise requirements.Unless otherwise specified in this standard, the machine shall comply with the requirements of EN 294:1992, Tables 1,3,4 and 6.
4.2 Starting control
The switching on control and the displacement control shall be separate. Those manual controls shall be placed on a panel lockable by a key. If the main control panel is not located on the pivot point or on the cart of a moving lateral an additional external circuit breaker shall be positioned at the pivot point or on the cart.
4.3 Stopping devices in plot limits In case of danger (road, railway, electrical line, buildings, …), in order to limit the (lisplacenlent of the centre pivot covering a circle quadrant and moving lateral type irrigation machine to the surface intended to be watered, two stopping devices shall be placed on two separate points, each stoppmg device shall be able independently to stop (or reverse) the displacement. The thrusts used shall have a minimum width taking into aceount machine (hialation and misalignment risk, their minimum height from the ground shall be 1 m. In case of danger zone one of the devices shall be a fixed impassable obstacle.
4.4 Alignment — Guiding
The alignment device shall be doubled with a safety device in case of misalignment. The safety device shall be activated in passive position. In case of breaking of the alignment device, a return spring or other mechanical device shall be able to bring back the mactune in safety position. For movable machines, in case of loss of guiding signal or deviation of more than 0,5 m, the machine shall stop.
4.5 Stability
4.5.1 Pirot point
The fixation of the pivot point shall withstand a horizontal load F = 10 000 N applied to the top of the pivot point (horizontal axis of the elbow) and a r(wersing moment of Frh = 40 000 Nm (h is the vertical distance from the application point of F to the ground). Each anchorage shall be able to withstand half of the load applied by the spray line, the anchorages shall be completely apparent and treated against corrosion.
4.5.2 Span
The span stability shall be checke(I by using the calculation note of prEN 12325-2:1996, annex A. The JX”IllUSSil)le h)ad in accor(laIlce with the elastic limit, shall be weighted with (he coefficient 1,5 under static conditions. The following loading (1Se.S will be considered for a machine with and without water.
— difference of slope L)CLWCCI1 tWo consecutive spans = 15 % (see example in Figure 1);
— total slope over several spans or the entirety = 10 % (see example in Figure 2);
— relative angle between two consecutive towers = ±150 (see example in Figure 3);
— relative angle between any two towers of the machine = ±300 (sec example in Figure 4);
— ground clearance II beneath these spans, or beneath the overhang at any point of the
installation  minimum ground clearance specified by the mamifacturer (F’Igure 5);
— side effort due to track effect = ±10 000 N (5000 N per wheel).The minimum steel wall thickiwss shall not be less than 2,5 mm. Weldings of stnicture elements shall be able to withstand the constraints listed in prEN 1Z325-2: 1996, annex A.
4.5.3 Overhang
A cloggmg in(hcator shall be fitted on the overhang. Gun stroke frequency shall be different, from natural frequencY of the structure to avoid resonance risks. 4.5.4 Structure
The structure shall be (lesiglwd to WIth.Stafl(l a wind of 140 km/h perpendicular to the structure nleasnre(I at 10 m from the groun(l Oil an horizontal surface (in accordance with Eurxode 3).
Compliance with this requirement is checked by calculation.
NOTE A European Standard on the climatic conditions of the installation area is in progress in CEN/TC 250/SC 1. 4.5.2 and 4.5.4 will be revised in due course to take into account the provisions of that standard.
4.6 Power supply
4.6.1 General
The devwes used for the power supply shall conforiri to EN 602(4-1.
NOTE Further requirements on traiLing cables will be added at the next revision of the standard.
4.6.2 Level of protection (according to EN c)529)
4.6.2.1 Gear moto,
The gear motors case shall be equipped with a device to hold and protect the supply cable intake or supplied with a reinforced cable. They shall be IP 44.
4.6.2.2 Main control panel
It shall not be less than JP 55 and equipped with a double internal door.
4.6.2.3 Other panels
They shall not be less than IP 44.
4.6.2.4 Collector ring
The collector box shall be IP 55.
4.6.2.5 Booster pump
It shall not be less than IP 44.
4.6.2.6 Stopping devices in plot limits
The switches of the stopping devices shall be protected against humidity, dust and corrosion. They shall be IP 66 if external; if they are included in boxes, theses boxes shall be IP 44.
4.6.3 Movable machines
The length of the electrical supplying cable shall be superior to pipe’s one of 15 m minimum, a pulling off safety device shall be provided. The cable shall be able to withstand a traction effort equivalent to its weight, it shall be protected against abrasion.
4.7 Filters
The irigation machine shall be designed so that a filter can be fitted at the admission located at a maximum height of 1,50 m from the ground.BS EN 909 free download.Agricultural and forestry machinery