ANALYTICAL AND LABORATORY EQUIPMENT 15
sinks, drip cups, anti- siphon traps and dilution vessels. If these form part of a maintenance system with demountable joints, it can be altered without damage to the original design. Tis means that any maintenance or requirement to expand can be done without further cost.
Fig. 2. Disposal of chemical waste requires a drainage system that provides a safe and long lasting solution in addition to the typical end user-requirements of value, efficiency and reliability.
Plastic chemical drainage systems have advanced greatly in recent years and now offer diverse, complete solutions, which has resulted in them becoming a popular choice for specifiers and contractors. As with all types of material, plastics have differing standards and performance benefits.
For example, the disposal of detergents (including non-ionic detergents) can affect certain types of plastic when under distress.
Crystalline polymer materials, such as Vulcathene from Durapipe UK, offer high resistance to attack and would therefore be more suitable than amorphous polymers, including PVC-U, PVC-C and ABS, which can be softened and in some cases result in stress cracking.
Despite plastics taking market share, borosilicate glass is also commonly seen in this type
of application; although its price often means that it is not used for whole systems. Both chemical and heat resistant, borosilicate glass is ideal for components such as bottle traps and dilution/recovery vessels. Tese strengths in addition to its ability to withstand strong chemical solutions mean it is often used in place of cast iron that has a tendency to corrode. However, borosilicate glass does have weaknesses, including its fragility, which makes it difficult to handle.
As well as making sure the chosen material is fit for purpose, the ideal chemical drainage system must offer versatility for all parties. Tis means a quick and easy installation, resulting in a secure system that keeps site costs to a minimum.
For the specifier, the solution needs to offer a comprehensive range of pipe fittings and additional items such as wastes,
In addition to choosing the right material, regulations and legal requirements always need to be met. Although there are guidelines for laboratory users to follow in terms of what can and cannot be disposed of down a sink, there are currently no specific British or CEN Standards for the performance of a chemical waste drainage system while standards relating to domestic waste are not valid.
“Compromising on just one element could mean that the system fails, budgets are exceeded, or legal standards aren’t met.”
Chris Ricketts, BSS Industrial
Technical guidance So, those requiring technical guidance should look for systems that offer assurances in the form of independent testing and approvals by bodies such as the BBA (British Board of Agreement).
Ultimately, the disposal of chemical waste requires a drainage system that provides a safe and long lasting solution in addition to the typical end user requirements of value, efficiency and reliability.
Careful consideration of the individual environment, supported by tried and tested options provide reassurance to the specifier and give end users the confidence that they are choosing a purpose-designed pipe system that will last and won’t be compromised over its lifetime.
Chris Ricketts is with BSS Industrial, Leicester, UK.
www.bssindustrial.co.uk
www.scientistlive.com
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