A coating must be applied as a continuous film to perform its intended function. Early failure will occur if there is a discontinuity—a holiday, as it is commonly called—such as a pinhole, void, crack, thin spot, foreign inclusion, or contaminant in the coating film. Many of these defects are not readily visible, but they can be located using holiday detection equipment. Holiday detection is typically performed on coating systems designed for critical service such as immersion or chemical storage. It is also conducted on coating systems applied to steel that is in contact with soil and/or constantly wet. Examples include buried pipelines, the undersides of tanks, and sheet pilings Holiday detectors are instruments that use electricity to locate film discontinuities. Most coatings are poor electrical conductors, and so they act as insulators. On the other hand, a metallic substrate such as steel is conductive to electricity. A holiday detector consists of a power source, a ground wire, a probing electrode, and an indicator. (Note: the terms “ground” and “grounding” in this article are synonymous with “earth” and “earthing.”) Current would flow if the leads of the ground wire and the probing electrode were attached to the power source and their tips were touched. If the ground wire was connected to a coated piece of steel and the probing electrode was placed on the coating surface, the coating would act as an insulator, and no current would flow. However, if a holiday was present in the coating, there would be a pathway for the current to flow. Holiday detectors have an indicator such as a sound or a light to tell when current is flowing. So, when the indicator shows current flow, it means a holiday is present.

Low Voltage Holiday Detection

Low-Voltage Holiday Detectors Low-voltage holiday detectors are used on coatings that are thinner than 500 microns (20 mils). They are powered by a self-contained battery with a voltage that ranges from 5 to 90 volts direct current, depending on the manufacturer. Low-voltage holiday detectors have either a buzzer or a light to show when current is flowing.

High Voltage Holiday Detection


High-Voltage Holiday Detectors High-voltage holiday detection is used when a coating is thicker than 500 microns (20 mils). The basic components of high-voltage detectors still include a power supply, ground wire, probing electrode, and indicator. However, the power supply for these units will provide thousands or tens of thousands of volts, and the probing electrode will be made of copper wires or carbon-embedded rubber.

Holiday Testing on Concrete Substrates

Coatings applied to concrete substrates can also be tested for discontinuities using either low-voltage or high-voltage holiday detectors, depending on the coating thickness. Concrete can be conductive depending on its moisture content, the type and density of concrete, and the location of the reinforcing steel (rebars or wire mesh).

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Potable Water Tank Inspection​

What is a Potable water tank

Potable water tanks are water storage tanks holding drinkable water, these tank shall comply with the rules and regulations of the food safety department of Dubai municipality.

As per a recent circulation sent from Dubai municipality, all the water tanks in schools, hotels, and commercial buildings, such as malls and tourist attractions, shall be considered as potable water tank, this is to push the vision of having drinkable tap water in Dubai.

 

What are the common types of Potable water tanks

There are various types of water tanks covered by the guideline, namely;

·        Reinforced Cement Concrete Tanks “RCC Tanks”:

§  RCC tanks are typically used in the basement/ground level, and are used to store the raw DEWA water and sometimes the filtered and chilled water in the ground level.

·        Glass-Reinforced Plastic panels Tank “GRP Tanks”:

§  GRP Tanks can be used at the ground level as well as at the upper levels to store the water prior to the distribution, they are the most common type of tanks found for water storage purposes.

·        Plastic Tanks:

§  Typically used at schools due to the price point, we’ve observed that these tanks age poorly and generally require replacing after few years of service.

·        Galvanized Tanks:

§  Steel tanks are rarely used for storing potable water.

 

Do you have to get your water tanks inspected?

Yes! Recently Dubai Municipality announced Circular Ref. No. DM-FSD-CR01 related to Drinking Water Tanks Inspection. Whereas Dubai Municipality Food Safety Directorate – Drinking Water Control Unit issued new water system monitoring and inspection guidelines. The scope of implementation covers the following: schools, residential, commercial buildings, universities, government buildings, hospitals, mosques, public buildings and factories with sources of un-bottled water.

The new guideline requests the owners or operators of all Dubai-based premises, from the categories mentioned, to obtain a conformity certificate for all of the domestic water tanks in every facility, except the private villas. The guideline includes a list of legal action which will be taken by DM against noncompliant parties.

B Safe Safety is an accredited inspection body. Hence, obtaining our certification for the domestic water tanks will waive any fines and problems that you may face during the routine Dubai municipality visits.

What we are checking during the inspection.

The third party inspection for potable water tanks is mainly consisting of two parts;

·        Chemical properties of the water:

o   This includes the pH level, TDS value, chlorine concentration, bromate level, and Escherichia coli test.

·        Physical condition of the tank:

o   This will observe if the tanks’ physical condition is complying with the regulations, checking for rust, cracks, uncovered openings, etc.

 

Documentation & Reporting.

Upon the completion of the inspection and the finishing up the lab results an initial report will be issued, and a follow up email will be sent to the client.

Then, assuming everything is satisfactory, a certificate will be issued. The certificate is valid for 1 year after the inspection.

In case the tank was not satisfactory, we will provide assistance for explaining the problem as well as the corrective actions, and a re-inspection shall be conducted after rectification.

Here at B Safe Safety, our certificates and initial reports are made to be easy to understand, simplicity and accuracy are our aim when it comes to certification and documentation.

B Safe Safety is an authorized body for analysis, inspection, and certification services in UAE.

Booking and inquires.

We ensure the potable water tanks undergoing our safety inspection are complying with the requirements of the food safety department.

We adhere to local regulations without compromising our thought out flexibility, this ensures that you will evade any issues with the local authorities so long you have obtained our certification.

We are known for our competitive pricing, flexible scheduling, and punctual timings, for any requests or inquires do not hesitate to contact us.