Tips

Rack Safety Inspection

Whilst recently re-reading the “storage equipment manufacturers association” (SEMA) code of practice for the use of pallet racking in warehouses, I was struck by how it isn’t followed in South Africa. While local rack manufacturers at least say that they produce their products to SEMA standards, estimates of the percentage of warehouses who even try to follow this code vary from 2% downwards. Requests to meet with a warehouse PRRS are likely to be met with a blank stare. If, and increasingly when, a rack collapse occurs, the normal reaction from warehouse management is to say that it had been under-designed. If just the code’s system of rack inspections was implemented across the warehouse industry rack collapses could be reduced by over 80 %. Every warehouse should have a trained PRRS (person responsible for racking safety). Forklift drivers should be encouraged to report any rack impacts immediately to the PRRS for assessment and, if necessary, repair. Competent trained persons, who may or may not be the PRRS, should inspect the racking on a weekly basis, complete the necessary paperwork for all damages noted. Here the red, amber and green levels of damage are used. Level of damage is twice the SEMA limits. Affected bays to be immediately cleared and demarcated with hazard tape until repaired by a trained rack repairer. Outside SEMA limits but racks do not require immediate offloading although no new pallets should be placed in the affected area. Once the area is empty, the racks can be repaired, so long as this happens within 4 weeks. If it doesn’t, the area is treated as Red. Damage is within SEMA limits but is recorded and checked weekly to make sure it hasn’t got worse. As part of the weekly inspection additional aspects including pallet quality, beam deflections, cleanliness and rack protection should be recorded and commented on. The report should then be signed off by the warehouse manager and the necessary repairs authorized. Annually or preferably bi-annually, the racking should be inspected by an external technically competent person primarily to make sure that the internal inspections are being done properly and that the internally reported damage is actually being properly repaired or replaced. For proper inspections to happen, technically competent and competent people are needed. As far as is known, no rack safety or inspection training is currently offered in South Africa. In an effort to assist, Barpro is training staff in house and is now offering external racking checks. However, these aren’t much good if regular internal rack inspections are not already in place. Barpro is also making internal rack inspection documentation and rack testing tools available to facilitate internal rack inspections. Barpro would like to work with other concerned parties so as to promote rack safety in South African warehouses. If more information is required please contact Mark Pearce on mark@barpro.co.za & 021 5529190

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Lithium takes charge

Humanity has been fascinated by electricity for a long time. The word itself comes from the Greek “electron” which means amber as small particles were seen to stick to amber once it had been rubbed. It was the American Benjamin Franklin who first referred to an electric “battery “using the term in a letter to humorously suggest that electrical experimenters should receive battery salute for their successes. Although he was referring to an artillery battery, the same term was then applied to his glass, lead and brine system to store electricity for future use. As the storage of electricity is central to the modern world’s attempts to wean itself off fossil fuels, there has been huge interest in developing new battery chemistries to allow for the efficient storage of electrical energy in a multitude of applications. For materials handling equipment in warehouses, especially in those applications where electrical as opposed to diesel or gas power is required, including cold and freezer stores, batteries have traditionally been of the lead-acid type. Lead-acid batteries are heavy, weighing over 1000kgs for counterbalance forklift applications, require special well ventilated charging areas as they give off noxious gases when charging, as well as heat. They also require constant maintenance to check the sulphuric acid electrolyte levels and to balance the electrical discharge from the individual battery cells. In tough cold storage applications, lead-acid batteries with good maintenance should last for approximately 8000 hours of operation. When charging they can store about 70% of the electricity supplied with the rest ending up as heat, requiring a cooling-off period before use. Where forklifts and other materials handling equipment is being used on a multi-shift basis, each vehicle should have three lead-acid batteries, one on an eight-hour charge, one cooling off and one in use on the machine. Battery changes have always been difficult given lead-acid battery weights and sheer size. All these activities require a substantial non -productive area in warehouses and cold stores. Balancell, established in 2008 by Dr Ian de Vries, is based in Paarden Eiland, Cape Town. Its original objective was to design and fit monitoring equipment on warehouse motive batteries. While this proved difficult due to the tough environment, battery recharging heat, freezing temperatures in cold stores and corrosive sulphuric acid, the information received from the ruggedly designed solid-state battery monitors enabled lead-acid batteries to function more efficiently, in some cases doubling their useful lifecycles. Being involved with motive batteries, Dr de Vries identified the advantages of the new Lithium Ferro phosphate batteries (LFP). These should be distinguished from Nickel Manganese Cobalt Oxide (NMC) batteries which are used in lightweight applications like tablets and cell phones. LFP batteries, while heavier than the NMC variety, are more chemically stable and are inherently safe.  They will not self ignite nor burn if punctured or crushed, making them ideal for materials handling equipment. Balancell is now manufacturing battery packs at its Cape Town factory using LFP cells imported from China, which incorporate the original monitoring equipment as adapted for the new battery chemistry.  In comparison with lead-acid batteries, LFP batteries with the same amp-hour rating are typically a quarter of the size and weight. On charging they produce no gas, so don’t require a special charging area. They also thrive on opportunity charging, typically during lunch and tea breaks. Normal charging takes about two hours as opposed to eight for a Lead acid battery and is 95% efficient meaning minimal heat is emitted. An LFP battery has powered a forklift for 23 hours on one full charge. However LFP batteries don’t like being left for long in a discharged state, so the battery monitoring unit warns the driver and shuts them down at 10% of capacity. Pricewise, LFP batteries are approximately double the price of their lead-acid equivalent. But their life cycle is up to 2.5 times longer meaning that a forklift should only require one battery in seven years. Forklifts using the lead-acid variety require three batteries which will on average last for three years. No special battery charging areas are needed and the health and safety aspects of gassing, spilt acid and the sheer difficulty of battery changes are removed. All the forklifts at Cape Fruit Cooler’s new high volume throughput Richmond Park facility are powered with Balancell’s LFP batteries. Please click on the attached link: https://www.youtube.com/watch?v=7eRCeEHzfsQ&t=47s/ For more information on Balancell’s new batteries, why not contact them at info@balancell.com . John Petrie, with a lifetime’s experience in materials handling equipment, is now consulting for Balancell. He can be contacted directly on 082 907 0994 or johnpetrie@balancell.com

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Various types of Pallet support

Various types of Pallet support

The Foresta Timber Group supplies timber decking which can be used to support “disposable” pallets in mobile racking applications. While timber decking is cheaper per pallet than metal support or grids – they can have the following disadvantages Restricts air flow Can be an additional fire hazard Benefits – Adds support to the whole pallet Comparative costs per pallet Open Timber Decking – R100.00 per pallet position (ex Vat and Delivery) Pallet Support Beams – R115.00 per pallet position (ex Vat and Delivery) Steel  – R300.00 per pallet position (ex Vat and Delivery) [gravityform id=”5″ title=”true” description=”true”]  

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