Tank inspection programme
- Inspection of storage tanks for dangerous liquids (Regulation on the storage of dangerous liquids in stationary storage tanks, Official Gazette of the Republic of Slovenia, št. 104/2009, 29/2010 in 105/2010) – accredited activity :
- aboveground and underground tanks made of sheet steel in the workshop and are, due to installation, transported to the storage area
- tankss welded from steel sheet at the place of installation
- Control of leakage of stationary tanks with overpressure – accredited activity
- Other tightness control of reservoirs – non-accredited activity
- Control of the breakthrough strength of tank insulation – non-accredited activity
- Control of wall thickness of tanks with ultrasound – non-accredited activity
- Review of storage status – non-accredited activity
- Control of explosive atmosphere – non-accredited activity
Inspection of storage tanks for dangerous liquids
Inspection of tanks for storage of dangerous liquids, or “Control of measures to prevent the leakage of dangerous liquids from stationary tanks” as defined in the Regulation on the storage of dangerous liquids in stationary storage tanks (Official Gazette of the Republic of Slovenia, št. 104/2009, amendments no. 29/2010 in 105/2010).
The company deals with review of tanks since 2000 on the basis of the Rules on how storages and transport facilities for dangerous and harmful substances must be constructed (Official Gazette of SRS, No. 3/79 and Official Gazette of the Republic of Slovenia, No. 67 / 02 – ZV-1). In 2011, we became an accredited control body of type C, according to the standard SIST EN ISO / IEC 17020, reg. no. K-113 for:
Inspection body Inspekt
- Control of measures to prevent the leakage of dangerous liquids from stationary tanks
- Control of the tightness of stationary tanks with overpressure
- Before the first filling of the tank
- Periodic inspections of the stationary tank during its operation
- Periodic inspections of the emptied stationary tank
- Inspections after the reconstruction of the stationary tank or before its recharging, if the stationary tank has not been filled with dangerous liquids for more than two years
Inspection period
Occasional verification of the measures to prevent the leakage of dangerous liquids during its operation should be carried out by periodic inspection of the stationary tank during its operation at least every five years.
Occasional checking of measures to prevent the leakage of hazardous liquids should be carried out by periodic inspection of the emptied tank for:
- underground or aboveground stationary tank with a nominal volume of less than or equal to 10.000 m3, at least every 15 years
- underground or aboveground stationary tank with a nominal volume greater than 10.000 m3, at least every 10 years
Tightness control of stationary tanks
Control with supervision of interlayer liquid
The tightness of the double wall tanks in operation is supervised by controlling the level of the interlayer liquid (rezervin, anti-corrosive liquid) that is poured into the space between the two walls of the tank.
The level of liquid in the interspace of double wall tanks is controlled visually in the tightness control tank, and the signaling of the liquid level can also be by sound or light.
Inspection by overpressure control (accredited activity)
The control of the tightness of the double-walled tanks can also be carried out by an electronic device that controls the tightness by overpressure and warns us with an alarm in case of leakage (spillage).
Inspection by negative pressure control
The tightness of the dual-bottomed tanks is controlled by the negative pressure control in the bottom interspace.
- Pressure test of tanks, pipelines and other equipment
- Hydrostatic test of tightness of the tanks
Control of the breakthrough strength of tank insulation
Control of the breakthrough strength of the tank insulation is carried out by the Holiday Detector PHD1-20 manufactured by BUCKLEYS
Basic technical data for inspection by insulation meter:
- scan speed 4 cm / s
- inspection scope 20 μm to 6.5 mm
- maximum continuous current <1 mA
- acceptable sensitivity 0-500 μA
- overlap between passages of at least 3 cm
Control of the wall thickness of the tanks by ultrasound
The purpose of investigation is to determine the actual thickness of the materials from which the tanks for storage of dangerous liquids are built and compliance with the prescribed requirements and standards. Investigations are carried out on the ground with calibrated equipment used by staff that is certified.
Explosive atmosphere control
In accordance with the Explosion Protection Rules, we must prevent an explosion and protect workers in front of it, classify workplaces into explosion hazard zones, create elaborate of explosion hazard, and assess the risk of an explosion. We carry out control of the explosion atmosphere in the storage area and in the tanks for storage of dangerous liquids. Control in tanks is carried out:
- before carrying out any work in the tank
- after cleaning the tank after termination of use
- for other needs
Examination of storage condition and making of assessment
Qualitative, and especially for the environment, safe storage and handling of dangerous liquids according to national and European standards must be ensured by proper equipment, control and maintenance. Environmental impacts should be kept to a minimum, so that storage is safe for the natural and urban environment and for employees.
Accreditation Certificate (PDF)
Annex to the Accreditation Certificate (PDF)
Commitment to impartiality and independence (PDF)
Most common mistakes in tanks and in hazardous liquids stores
The tank or tanks containment system is not tight
Flange connections of the pipelines are not tight
The tank does not have a built-in anti-overfill device
Heavily corroded bottom of the tank
The containment system does not have a built-in system for audible or light alert on possible leakage from the tank
The storage has no containment system of the appropriate dimensions (volume, height)
The storage does not have a suitable fuel transfer station (filling and discharging the tank)
The flow of hazardous liquids must be carried out on an appropriate impermeable surface, the drainage of which must be driven through the containment system. In order to satisfy the requirement, the surface must be drained through an oil catcher and a shut-off valve. The shut-off valve must be closed during the transfer time on the pretensioner platform to prevent the passage of the dangerous liquid into the sewage system. The oil catcher is manufactured in accordance with the SIST EN 858 standard and prevents oil, gasoline, gas oil, fuel oil and other dangerous substances from flowing into the environment.
