Safety

Price vs. Value

“There is hardly anything in the world that someone cannot make a little worse and sell a little cheaper, and the people who consider price alone are that person’s lawful prey” – These words have been widely used in recent decades, and are usually attributed to nineteenth century thinker John Ruskin. (although there is no evidence to suggest he ever said it). An expanded version goes on to say: “It’s unwise to pay too much, but it’s worse to pay too little. When you pay too much, you lose a little money – that is all. When you pay too little, you sometimes lose everything, because the thing you bought was incapable of doing the thing it was bought to do. The common law of business balance prohibits paying a little and getting a lot – it can’t be done. If you deal with the lowest bidder, it is well to add something for the risk you run, and if you do that you would have had enough to pay for something better.” This basic rule should be common sense, but surprisingly often isn’t.  Mankind is at heart a race of bargain hunters.  We shop around in hopes of paying less, and usually finish up getting less.  Purveyors of cheap goods and services bend over backwards to avoid the terminology ‘cheap’, since the obvious connotation is ‘nasty’.  So they say ‘lower price’, or ‘inexpensive’ . . . but what they mean is ‘cheaper’.  And what you mostly get is less value. How does ‘cheap’ relate to value? Usually negatively. In economic terms value is the monetary worth of something, and ‘worth’ in turn can be measured in many ways.  A product or service that well performs the function for which it was designed, reliably and demonstrably long-term, will always contain more worth, or value, than that which is designed from the outset to cost less – but probably not perform so well, or last so long. Nowhere is the foregoing more true than in the case of mobile racking. Barpro SA prides itself in providing genuine value-for-money with its offering, and after more than twenty years and well over 200 STORAX systems in South Africa alone – most of which are still functioning as well as the day they were commissioned  – Barpro SA has an enviable and unequalled track record of designing and installing durable systems, and boasts a multitude of satisfied customers. If someone claims the ability to provide equivalent systems , but cheaper – beware and re-read the above.   Remember the rule of thumb is that “you get what you pay for”.

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Designing concrete floors with STORAX rails for mobile racking

We have designed a number of reinforced concrete floor slabs to support Storax loads with the rails cast in. There are a number of considerations when doing the design the main one being the moving point loads from the wheeled racks. – We use finite element analysis with plate elements and a spring support at each node to model    the subsoil stiffness and insulation underlay stiffness. – The rail stiffness is included in the model to reduce the maximum slab moments and hence  reduce the amount of rebar without effecting the factor of safety. – The sequence of construction is critical to a good installation which is as follows: – Note this is for a cold room slab and would be similar for a standard warehouse excluding the  insulating layers. – Level, compact and test the subsoil – Excavate strips under the rail positions – Cast the reinforced strips on an insulation layer with rebar protruding along the edges – Fix the rails to the strips by drilled anchors. – Adjust the rail alignment to the very fine tolerances using the adjustable rail clamps – Check that all the rail clamp bolts are tight – Recheck the alignment with a laser. – Place the under slab insulating layer – Fix the remaining rebar – Employ an expert flooring contractor to cast and power float the slab to tight tolerances – The strips are bonded into the final cast with the protruding rebar and the final slab acts as a  single monolithic unit taking advantage of the thicker slab under the rail point loads. The following list of items can easily trip up the designer: – Expansive clays in the subsoil-if there is any doubt in an experienced designer’s mind then a  Geotechnical report must be called for. – Concrete shrinkage-these slabs are generally large and have no expansion joints-they shrink  towards the centre point of the slab and if there is any restraint a crack will occur at the restraint-  i.e. all existing steel columns (and any other restraint) must be wrapped with compressible layer  e.g. jointex. These slabs are often cast on top of existing slabs which then require access ramps-  care must be taken to ensure the ramp is not anchored and can shrink with the slab. – There are surround reinforced concrete kerbs and the starter bars for these kerbs must be cast  into the slab. In cold rooms the moisture content of the concrete must be below specified levels before the temperature is drawn down-excess mixture will expand on freezing and cause problems. Extensions to existing freezer slabs have the problem that the new concrete touches frozen concrete and will not set-propriety products must be used in locally around the frozen areas or an igloo must be built locally to allow the temperature of the existing slab to be raised locally when casting. Rod Holmes CONSPEC cc CONSULTING CIVIL ENGINEERS 7 SURCINGLE AVE, HOUTBAY 7806 TEL/FAX: 021 790 5638

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Is oxygen reduction a viable alternative to sprinklers in cold and freezer stores?

Sprinkler systems in cold and freezer stores are problematic and expensive. If a sprinkler head is broken accidentally, ice builds up on the floor before the water can be turned off. Mobile racks cannot be moved until the ice is cleared. Frozen product which has been soaked by sprinklers should not be sold. If a fire occurs close to the cold store floor, it has every chance of being well established before the sprinklers activate. Even if the fire is put out, product is smoke damaged. As prevention is better than cure, the OXIT system from FX-Prevent in Holland decreases the air’s oxygen content from the normal 19.5% at sea level until there is insufficient oxygen for a fire to start.  In most cases employees can continue to work inside the freezer room.  Oxygen sensors keep the air composition constant by feeding in additional nitrogen when required.  Oxit systems for cold stores on the Highveld would have to take the increased altitude into account. So, could oxygen reduction systems be a safe and cost effective alternative to sprinklers?  We look forward to your views. You can read more here: www.fx-prevent.com

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