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FAQ
Medical tents
How can you couple a number of tents together?
Medical tents can be coupled together without difficulty at the entry side using velcro connectors via the circumferential collar. In order to connect tents at an angle of 90° a docking tent is necessary.
Is there insulation for the tents?
Using additional insulation awnings it is possible to achieve warm and cold insulation.
Why is it possible to remove all awnings individually?
Depending on operational requirements, entry awnings or separation walls can either be inserted or removed.
Why can one remove the floor individually?
Depending on the ground quality it may be necessary to remove the ground sheet. If, for example, during an accident situation the rapid erection tent is to be positioned over the accident vehicle due to weather conditions or as visual protection, then the tent ground sheet can be quickly removed thanks to velcro connectors.
What resistance does the tent/shower have against chemicals?
Vetter pneumatic tents are resistive against a number of chemicals. Details concerning this are contained in the operating instructions as well as in the area of Documentation. However, in special cases please contact us.
Is the tent awning flame resistant?
The awning material is flame resistant according to DIN 4102, B 1.
Are there any limitations when using at warm or cold temperatures?
Owing to material characteristics, tents and their support frames are operational between -40°C to +50°C. Please also read the operating instructions to this. Please refer to instruction manual.
Can the tents and showers be repaired?
Minor damage to the support frame can be repaired without difficulty using repair sealing patches from the repair kit. This also applies to minor damage to the awnings or to the flooring which again can be repaired with the supplied repair material.
Can the safety valve be exchanged?
The safety valve used in the support frame can be exchanged for an original Vetter spare part by a specialist without any difficulty. After exchange, the specialist must carry out a test in order to prove perfect operation.
How do you clean the tent or shower?
It is best to remove rough dirt with clean water. Finally, clean the tent surface and support frame with warm soapy water and a brush. Dry thoroughly after cleaning!
How are the tents and showers stored?
After operation, tents and showers are only to be stored into the pack bag after they have been thoroughly cleaned and a visual inspection as well as function test carried out. After cleaning you must ensure that the complete tent, including all fittings, are thoroughly dry. The storage location must be cool and dry. For more information please refer to DIN 7716.
Are tents and showers subject to an inspection cycle?
Tents as well as their support frames are not subject to any test regulations. However, in order to maintain their operational readiness the tents must be given a visual as well as a function inspection by a specialist after each operation, but at least once every year.
How can the tent and shower frame be tested?
When testing the tent frame it should be inflated to the operating pressure (REMEMBER: the safety valve should not blow!). An intensive visual inspection must be made in this condition. The pressure must not reduce by more than 10% within a period of one hour. If the pressure exceeds this tolerance value then the complete tent frame must be washed with soapy water in order to determine any possible leaks.
How can I suction off or drain the liquid with a decontamination tent or shower?
Basins which are full can be simply emptied with the corresponding pump. A special suction jet is available for the remaining amount.
Are there integrated gloves for the decontamination showers?
Yes, gloves are integrated into the shower curtain if required
General questions
How are you able to tell the age of a Vetter product?
You are able to tell the age of Vetter products by the serial number. From August 1994 onwards an eight digit number is used (e.g. 01115678). The first two digits indicate the month of production (in this case January). The next two digits indicate the year of production (in this case 2011). The following four digits are only product-related numbers and have no connection with product age.
How is the air requirement calculated?
The maximum air requirement is the volume of air in litres that is necessary to produce the maximum permitted operating pressure in the unloaded condition at normal room temperature. The maximum air requirement can be calculated by the following formula: Nominal capacity in litres * (permissible operating pressure in bar + 1 bar surrounding atmospheric pressure) Example: A S.Tec 12 lifting bag has a nominal capacity of 61,4 litres and a permissible operating pressure of 12 bar/174 psi. The atmospheric pressure is normally 1 bar/14.5 psi. This results in an air requirement of 798,3 litres.
Can you combine inflation devices and products from various manufacturers?
It is technically possible to use products from one manufacturer with the inflation device of another manufacturer as long as the coupling systems are compatible and the maximum operating pressure identical. However, it is imperative that the following be observed: Only when the product and corresponding inflation device is from one manufacturer can you assume that this system has been subjected to a construction test and acceptance test by the manufacturer. In addition to this any manufacturer guarantee becomes invalid when components from different manufacturers are combined together and therefore the user is always completely liable if any damage occurs.
Why are there different coupling systems?
In order to ensure that no controller having a higher operating pressure is connected to a product with a lower operating pressure, the manufacturer of controllers, products and inflation hoses has fitted them with coupling systems which correspond to the pressure category. For example, if the user were to inflate a lifting bag (1 bar/14.5 psi) with a controller for a S.Tec 12 lifting bag (12 bar/174 psi) then the bag would unavoidably burst due to the extremely high inflation pressure. The regulations for product liability oblige the manufacturer to design a product which eliminates human error to the greatest extent possible. However, due to the different coupling systems this error is eliminated.
Why do the inflation hoses have different colours?
The colour of the inflation hose simplifies correct control of the different bags when in operation. Precisely when the position of individual bags have to be changed due to the operation situation it may happen that wrong bag control takes place because the side arrangement of the bags in relation to the controller is no longer the same. The bag arrangement to the controller is simplified by hose colours.
Why must a controller be used?
Pressure devices must be protected against unintentional over-inflation. The component-tested safety valve on the controller stops a product being pressurized at a pressure higher than the permitted operating pressure. If, due to additional load, there is a pressure increase in the product then the safety valve will activate and counter this increase. The specified manometer reliably indicates the bag pressure. In addition to this there is a blocking and releasing device for safe bag operation.
What does the safety factor signify?
The safety factor gives the relationship between the bursting pressure and the permissible operating over-pressure. For example, if a S.Tec 12 Lifting bag 12 bar/174 psi has the safety factor "4" then the bursting pressure must be 48 bar/696 psi.
Who is allowed to re-seal a safety valve?
Safety valves are given a seal as a visual indication against non-permitted adjustment. At present there is a difference between customs seals and seal plates. If the corresponding seal is no longer available then the safety valve (on the controller or the inflation hose and safety hose) is not allowed to be used any more. If the specialist has the corresponding measurement device as well as his own sealing pliers then he is allowed to re-seal the safety valve. Otherwise the safety valve must be exchanged for a new one.
Are you allowed to repair piston valves?
Generally, defective piston valves are only allowed to be maintained by a specialist. However, in order to exchange the sealing ring of the piston rod considerable time is required for the repair in addition to having the corresponding special tool. If material and time is calculated, it is generally better to exchange the complete piston valve.
Who is allowed to re-bond defective hoses?
If required, inflation hoses and air supply hoses can be fitted with new coupling components by a specialist. In doing this it is not necessary to use crimp sleeves because this requires a special tool; normal hosing sleeves can be used. Generally a repaired sleeve should be tested for leaks at 1.5 times the operating pressure.
Lifting bags 1 bar/14.5 psi
Can water be used as an inflation agent?
With lifting bags you must only use air for inflation. Water is not practical solely due to the considerable weight involved.
Why do the inflation hoses have different colours?
The colour of the inflation hose simplifies correct control of the different bags when in operation. Precisely when the position of individual bags have to be changed due to the operation situation it may happen that wrong bag control takes place because the side arrangement of the bags in relation to the controller is no longer the same. The bag arrangement to the controller is simplified by hose colours.
How soft should the supporting ground be?
As opposed to mechanical or hydraulic lifting equipment, lifting bags have a very low contact pressure. Lifting bags (1 bar/14.5 psi) produce a pressure of 1.0 kg/cm2 on the ground. This is less than a normal person produces when he places his foot on the ground. Therefore this means that lifting bags can be used everywhere where you are able to walk or step.
How flat must the ground be when using lifting bags?
Due to their flexible design, lifting bags can also adapt to extremely uneven ground. In order to avoid bag damage, the contact area should be free of any pointed objects, as well as puncturing or sharp edges. Note: You can drive over the contact area with a truck tyre without damaging this, after that the bag can be used.
Can you use lifting bags on top of each other?
Lifting bags 1 bar/14.5 psi must never be used on top of each other. With this configuration the total height of both bags would exceed the diameter or the smallest side length of the base area therefore causing bending of the bag column during operation and leading to catapulting of the bag outwards.
In general, must a load lifted by a lifting bag be sub-supported?
Every load lifted must be sub-supported irrespective of the applied lifting device. Each lifting device can fail in extreme cases!!! If the lift is necessary for rescuing a trapped person or if work must be carried out underneath the lifted load then a corresponding non-positive construction is absolutely necessary.
Up to what angle between ground and load can the lifting bag be used?
In general a load is never completely lifted with the lifting bag but elevated from one side. In doing this there is always an angle between the load to be lifted and the supporting ground. Determination of the maximum permissible angle is therefore not possible because this is largely dependent on the grip of the bag surface and the load, respectively ground. Logically, a lifting bag having smooth or oily surfaces will slip quicker than contact surfaces which are rough thus offering better gripping characteristics. If, due to operational circumstances, a large angle between load and ground is necessary then bag slippage must be expected and therefore corresponding counter-measures taken to ensure safety.
Can the hose be released on a lifting bag when under pressure and still supporting the load?
Generally the pressure on a lifting bag must only be released via a controller. For example if the hose is released from the bag then the load will uncontrollably lower and cause an accident.
Should a lifting bag be used when the carrying loops are torn?
Carrying loops are exclusively used for bag transportation and to position. The existence of the loops has no influence on the functional or operational safety. However if a loop is torn off then the specialist must carefully check to see if any damage has been caused to the pressure container wall.
Can you repair the lifting bag yourself?
The lifting bag 1 bar/14.5 psi can, under certain circumstances, be repaired by the user with the Vetter repair instructions. Repair instructions are contained in the repair material set or can be ordered.
What is the definition of the term "pneumatic lifting device"?
The term "pneumatic lifting device" is understood to be the fittings on a bag which correspond to DIN 14 152 T 1. For example a lifting device set according to DIN consists of the following individual components: • Pressure bag • Inflation hose • Controlling component (with manometer and safety valve) • Air hose (this is normally on the pressure regulator) • Pressure regulator • including compressed air bottle
What does the term "lifting bag" mean?
Lifting bag is the product name for pneumatic bags used for lifting purposes from the production range of Vetter GmbH. However, due to that fact that the product name is no longer protected, then this term is currently used as a category name.
When must lifting bags be tested?
DGUV-G-305:002 specifies this in Section 4 (pneumatic lifting device): a) Visual test after each operation/application by the user b) A visual test and function test should be carried out at least once every year by a specialist according to the preliminary remarks in GUV c) A pressure test every five years by - a specialist having additional manufacturer training for lifting bags <1 bar/14.5 psi OR - the manufacturer for lifting bags 1 bar/14.5 psi In addition to this a visual test and function test should be carried out when there is any doubt about the function or safety. An extensive test is especially necessary after repair has been made.
Who is the specialist for testing lifting bags?
The specialist for the testing of lifting bags is defined in the preliminary remarks of DGUV-G-305:002 as follows: The specialist working according to these principles is authorized to test fire service devices and equipment if he has specialist training and experience, as well as having the sufficient knowledge in the field of the devices and equipment to be tested and that he is conversant with the pertinent public work protection regulations, accident prevention regulations, guidelines and generally recognized regulations for technology (e.g. DIN, CEN, ISO, VDE regulations) enabling him to judge the working safety condition of the corresponding device or the corresponding equipment. The user decides whether the specialist meets the corresponding conditions before commissioning him as a lifting bag tester.
Who is a specialist with additional qualification according to the preliminary remarks in DGUV-G-305:002
For the five yearly inspection of pneumatic lifters with an additional operating pressure >1 bar/14.5 psi the DGUV-G-305:002 Section 4.2.1.2 requires that the specialist tester undergo additional training carried out by the manufacturer or by a trainer authorized by the manufacturer. This training should and must impart specific product knowledge about the product of the corresponding manufacturer as well as the special and correct execution of the pressure test. Specialists, who have already successfully completed a training course at Vetter GmbH, already have this required additional training. If this training is more than 5 years old then a refresh course is required. Information to training courses you can get under vetter.info@idexcorp.com.
Must the test be documented?
Yes. Generally every test must be documented.
Lifting bags 8 / 10 / 12 bar/ 116 / 145 / 174 psi
Why do the inflation hoses have different colours?
The colour of the inflation hose simplifies correct control of the different bags when in operation. Precisely when the position of individual bags have to be changed due to the operation situation it may happen that wrong bag control takes place because the side arrangement of the bags in relation to the controller is no longer the same. The bag arrangement to the controller is simplified by hose colours.
Can water be used as an inflation agent?
With mini lifting bags if may be necessary to use water during special operations (e.g. operations at greater water depths). Depending on the low flow rate there is a high risk caused by sudden increases in pressure due to the fact that water cannot flow so quickly through the hose to the safety valve. Of course special regulators with water resistant manometers and safety valves are required when operating with water.
What does the Load/Path diagram indicate?
Lifting is produced by bulging of the top and bottom plates with mini lifting bags. In doing this the contact area with the ground or load decreases with increasing bulge. However, power is the product of area x pressure. If the effective area decreases with constant pressure then the lifting power will also correspondingly decrease. Consequently, a mini lifting bag produces the greatest possible power, at the beginning of the lift, i.e. at this point it has the greatest possible area. With a maximum bulge the contact area is practically point-shaped and therefore the lifting power no longer exists. Owing to the fact that the progression of power is dependent on the geometrical shape (square or rectangular) via the lift path, a curve cannot be calculated. Instead of this a technical measurement is made for each shape of bag. Individual Load/Path diagrams are available on request.
Why must the lower mini lifting bag be inflated first?
Depending on the operational situation, 2 mini lifting bags must be positioned on top of each other in some individual cases. If, in doing this, the supporting ground is soft (earth or something similar) then the lower bag must always be inflated first. The bulging bag adapts to the shape of the ground and increases stability. After doing this the second bag on the top can be inflated. Therefore, just for routine reasons, on ground capable of support the lower bag must always be inflated first.
Is the contact nipple allowed to be exchanged on mini lifting bags?
The connection nipple can be exchanged by a specialist (refer to GUV-G 9102) if it was damaged due to incorrect use. The instructions for this can be obtained by downloading or on request.
Why cannot 3 to more mini lifting bags be positioned over each other?
Mini lifting bags can, in certain situations, be positioned on top of each other when the angle between ground and load is not too large. However, one cannot say how large this angle should be because this is dependent on different parameters, e.g. ground quality, stability of the load etc. For safety reasons a person must never stand in front of the bag because a bag may catapult out. Owing to the fact that a mini lifting bag will always try to achieve a spherical shape it will correspondingly behave like a sphere with regard to position stability. Because a load is not normally completely lifted with the mini lifting bag but only elevated from one side, then the angle between ground and load becomes greater as lift progresses. The bag adapts to this changing angle by slightly rolling to the outside. If the angle is too large then the bag can be catapulted out. However if 3 bags are positioned on top of each other then this WILL certainly result in the bag catapulting outwards.
Why is a back-pressure valve not permitted in the connection nipple?
Mini lifting bags are pressure containers and must therefore be fitted with a safety valve in order to avoid exceeding the maximum operating pressure. With a mini lifting bag the contact area to the load and ground corresponds to the load being lifted at a maximum operating pressure (Power = Area x Pressure). If, due to movement of the load, an additional weight loading is applied to the bag then it will be pressed together by the load. Consequently the bag volume decreases and the bag pressure increases. The safety valve opens and the pressure reduced until the contact area corresponds to the current load. If a safety valve were to be built into the connection nipple then this would separate the safety valve from the bag and become ineffective and the bag would burst. Therefore, due to safety reasons, there must always be a connection between the bag (pressure container) and the safety valve.
Can you repair the mini lifting bag yourself?
Generally mini lifting bags 8 / 10 / 12 bar cannot be repaired. It is only the connection which can be exchanged.
What is the test pressure when carrying out a pressure test on a lifting bag?
The reference sheet HP 30 (carrying out pressure testing) specifies the test pressure for testing with water at 1.3 times the permitted maximum operating pressure. This means: S.Tec 12 Lifting bags are tested for leaks or non-typical deformations using a test pressure of 18 bar / 261 psi water pressure within a minimum period of 3 minutes and a maximum period of 5 minutes.
Must the test be documented?
Yes. Generally every test must be documented.
Safety cushions
Which compressed air cylinders can be used for inflation of Safety Cushions?
Equipment air cylinders or inhaling air bottles whose valves are not fitted with an excess flow valve.
What happens when I use an inhaling air container with an excess flow valve for inflation of the Safety Cushion?
A piston is pressed through the excess flow valve against a retaining spring by the volume flow. In doing this the cross-section of the valve is narrowed and the set-up time of the bag extends from 30 seconds to approximately 3 minutes. Therefore the permit is cancelled and the suitability for fire service operation no longer exists.
Can I see if the valve on my pressure container is fitted with an excess flow valve?
No. Bottle valves fitted with an excess flow valve are not marked and the excess flow valve cannot be recognized in the assembled condition of the valve.
What is the jump rate of the bag – how often, how many people etc.?
The jump bag is ready for the next jump as soon as it completely erects after use. The command for jumping is made by the operational leader. The recovery time between jumps depends on the cushion size: SP 16 - 10 sec. SP 25 - 20 sec. SP 60 - 20 sec.
Can over-jumps be made?
Over-jumps are generally not permitted due to the danger of injury.
How can the jump bags be secured to the ground?
Jump bags should generally not be secured to the ground because this hinders bag function (bulging of the ground cover).
When in operation, are there any limitations with regard to heat/cold?
Jump bags can be used in a temperature range from –40°C to +50°C. Higher temperatures can, under certain conditions, reduce the life duration due to quicker material ageing. For more information please refer to the instruction manual.
Can safety cushions be repaired?
Small areas of damage on the support frame can be repaired without difficulty and finally tested by a specialist having additional training (also refer to DGUV-G-305:002) using the VETTER repair set. Damage in the area of the landing cover or the side covers and ground covers should be generally carried out by the manufacturer.
Can the safety valve be exchanged?
Yes, but only by a specialist with additional training by the manufacturer. Exchange of the safety valve as well as the final test must be documented.
How must the jump bags be stored?
Basically, the jump bags must only be cleaned, tested and then stored in the original packing case in a cool and dry location. Please refer DIN 7716.
How can be jump bag be tested?
The repetitive test must only be carried out by a trained specialist (training at the manufacturer) according to the requirements specified in DGUV-G-305:002, Section 3.2. For more information please contact vetter.info@idexcorp.com .
Rescue Paths
What type of under-support can you use for the walkway?
Rescue walkways are intended for the human rescue on thin ice or on open water. Also they are used for traversing unstable or boggy ground.
What is the load carrying capacity of the rescue walkway?
The rescue walkway is able to carry 3 to 4 people simultaneously depending on the length. Load capacity approx. 95 kg/m² (2,255 lbs/sq.ft.)
How can I connect a number of walkways together?
If necessary, rescue walkways can be connected together in length or in width without any difficulty using securing lines.
Leak Sealing Bags
Can I easily connect the bag without losing any air?
Pipe sealing bags, test sealing bags as well as leak sealing bags are fitted with a self-closing connection coupling. If the inflation hose is uncoupled then the valve will automatically close and the bag remains pressurized. Even the inflation hoses 1.5 bar/21.75 psi and 2.5 bar/36.25 psi are fitted with self-closing couplings.
How can be bags be tested / When must they be tested?
It is sufficient to carry out a detailed visual test for cracks, cuts or punctures as well as checking to see if the inflation coupling is in perfect condition and, if necessary, the existing securing fittings. A periodical test, e.g. annually, should be made on the bag in the tensioned condition at the maximum operating pressure.
How must the bags be stored?
Leak sealing bags should, the same as other rubber products, be stored in a cool and dry location according to DIN 7716.
Gully Sealing Bags
Are the bags resistant against oil and chemicals?
VETTER universal gully sealing bags are resistant against a number of oils or chemicals. Details can be obtained in special cases from the manufacturer who on request will also make material specimens available for independent resistance examinations.
What is with square gullies?
The VETTER Universal Gully Sealing Bag 2.5 bar/36.25 psi was specially developed of square gullies. Due to the fact that these bags are used in round drainage pipes, the shape of the floor inlet is irrelevant.
Pneumatic Collection Containers
How can I pump out/suction out the liquid?
Filled containers can be emptied with the corresponding pumps. Any remaining liquid can be extracted with a special suction jet.
Against what is the sheet resistant?
The insertion containers can be supplied in two different materials: PVC and Alcryn. PVC is resistant against: e.g. nitric acid, hydrochloric acid, caustic soda etc. Alcryn is resistant against: e.g. ASTM Oil No. 1-3, gear oil, petroleum, gasoline (non-leaded). More information on request.
Why are containers not closed?
As the name indicates, collection containers are used for collecting hazardous liquids leaking from, or underneath, defective tanks. Collection containers are not transport containers and do not therefore need a closure. For transportation purposes there are permitted transport containers available having a special design.
How can I repair the support frame?
Small areas of damage can be sealed temporarily during operation using a patch from the repair set.
How can be sheets be repaired?
Damage in the area of the inner sheet can be easily and quickly repaired with normal repair sets for PVC sheets.
Pneumatic Tents and showers
Wie kann man mehrere Zelte miteinander verbinden?
Tents of the same height, width and roof shape can be connected together longitudinally without any difficulty using Velcro fasteners to form one large unit. The PZ 30 and PZ 40 can also be coupled together. A docking tent is required to connect tents at a 90° angle.
Is there insulation for the tents?
Using additional insulation awnings it is possible to achieve warm and cold insulation.
Why is it possible to remove all awnings individually?
Depending on operational requirements, entry awnings or separation walls can either be inserted or removed.
Why can one remove the floor individually?
Depending on the ground quality it may be necessary to remove the ground sheet. If, for example, during an accident situation the rapid erection tent is to be positioned over the accident vehicle due to weather conditions or as visual protection, then the tent ground sheet can be quickly removed thanks to velcro connectors.
What resistance does the tent/shower have against chemicals?
Vetter pneumatic tents are resistive against a number of chemicals. Details concerning this are contained in the operating instructions as well as in the area of Documentation. However, in special cases please contact us.
Is the tent awning flame resistant?
The awning material is flame resistant according to DIN 4102, B 1.
Are there any limitations when using at warm or cold temperatures?
Owing to material characteristics, tents and their support frames are operational between -40°C to +50°C. Please also read the operating instructions to this. Please refer to instruction manual.
Can the tents and showers be repaired?
Minor damage to the support frame can be repaired without difficulty using repair sealing patches from the repair kit. This also applies to minor damage to the awnings or to the flooring which again can be repaired with the supplied repair material.
Can the safety valve be exchanged?
The safety valve used in the support frame can be exchanged for an original Vetter spare part by a specialist without any difficulty. After exchange, the specialist must carry out a test in order to prove perfect operation.
How do you clean the tent or shower?
It is best to remove rough dirt with clean water. Finally, clean the tent surface and support frame with warm soapy water and a brush. Dry thoroughly after cleaning!
How are the tents and showers stored?
After operation, tents and showers are only to be stored into the pack bag after they have been thoroughly cleaned and a visual inspection as well as function test carried out. After cleaning you must ensure that the complete tent, including all fittings, are thoroughly dry. The storage location must be cool and dry. For more information please refer to DIN 7716.
Are tents and showers subject to an inspection cycle?
Tents as well as their support frames are not subject to any test regulations. However, in order to maintain their operational readiness the tents must be given a visual as well as a function inspection by a specialist after each operation, but at least once every year.
How can the tent and shower frame be tested?
When testing the tent frame it should be inflated to the operating pressure (REMEMBER: the safety valve should not blow!). An intensive visual inspection must be made in this condition. The pressure must not reduce by more than 10% within a period of one hour. If the pressure exceeds this tolerance value then the complete tent frame must be washed with soapy water in order to determine any possible leaks.
How can I suction off or drain the liquid with a decontamination tent or shower?
Basins which are full can be simply emptied with the corresponding pump. A special suction jet is available for the remaining amount.
Are there integrated gloves for the decontamination showers?
Yes, gloves are integrated into the shower curtain if required
Oil and Water Aspirators
Can I use the aspirator for chemicals?
VETTER oil and water aspirators are intended for aspirating oil, water or dust media. Acids, caustic solutions or toxic dust must not be aspirated. This also applies to operations involving inflammable, gas forming liquids which must also not be aspirated. More information on request.
How large or small can solid particles be for aspirating?
Relatively large foreign bodies can be aspirated depending on the extremely large hose diameter (38 mm). However, this is dependent on the condition of the corresponding material and should therefore be tested before a long operational period.
Why do VETTER aspirators not have stainless steel containers?
Small areas of damage on containers made of glass fibre reinforced plastic can be repaired without difficulty using the economical repair set (vehicle dealer) and can therefore be reused. Dents or deformations in metallic containers cause leaks in the area of the adapter cover and require the container to be exchanged. Glass fibre reinforced plastic keeps its shape.
Are VETTER oil and water aspirators explosion-proof?
Liquid aspirators working according to the vacuum principle are not explosion-proof because an explosive mixture of air and gas is always produced by its functional principle when aspirating inflammable liquids.
Is it possible to use the aspirator in explosive areas
In the so-called explosion protection zone 0 only special explosion-proof equipment may be brought into use
General questions
How are you able to tell the age of a Vetter product?
You are able to tell the age of Vetter products by the serial number. From August 1994 onwards an eight digit number is used (e.g. 01115678). The first two digits indicate the month of production (in this case January). The next two digits indicate the year of production (in this case 2011). The following four digits are only product-related numbers and have no connection with product age.
How is the air requirement calculated?
The maximum air requirement is the volume of air in litres that is necessary to produce the maximum permitted operating pressure in the unloaded condition at normal room temperature. The maximum air requirement can be calculated by the following formula: Nominal capacity in litres * (permissible operating pressure in bar + 1 bar surrounding atmospheric pressure) Example: A S.Tec 12 Lifting bag has a nominal capacity of 61,4 litres and a permissible operating pressure of 12 bar/174 psi. The atmospheric pressure is normally 1 bar/14.5 psi. This results in an air requirement of 798,3 litres.
Why are there different coupling systems?
In order to ensure that no controller having a higher operating pressure is connected to a product with a lower operating pressure, the manufacturer of controllers, products and inflation hoses has fitted them with coupling systems which correspond to the pressure category. For example, if the user were to inflate a lifting bag (1 bar/14.5 psi) with a controller for a S.Tec 12 Lifting bag (12 bar/ 174 psi) then the bag would unavoidably burst due to the extremely high inflation pressure. The regulations for product liability oblige the manufacturer to design a product which eliminates human error to the greatest extent possible. However, due to the different coupling systems this error is eliminated.
Why do the inflation hoses have different colours?
The colour of the inflation hose simplifies correct control of the different bags when in operation. Precisely when the position of individual bags have to be changed due to the operation situation it may happen that wrong bag control takes place because the side arrangement of the bags in relation to the controller is no longer the same. The bag arrangement to the controller is simplified by hose colours.
Why must a controller be used?
Pressure devices must be protected against unintentional over-inflation. The component-tested safety valve on the controller stops a product being pressurized at a pressure higher than the permitted operating pressure. If, due to additional load, there is a pressure increase in the product then the safety valve will activate and counter this increase. The specified manometer reliably indicates the bag pressure. In addition to this there is a blocking and releasing device for safe bag operation.
What does the safety factor signify?
The safety factor gives the relationship between the bursting pressure and the permissible operating over-pressure. For example, if a S.Tec 12 Lifting bag 12 bar/174 psi has the safety factor "4" then the bursting pressure must be 48 bar/694 psi.
Who is allowed to re-seal a safety valve?
Safety valves are given a seal as a visual indication against non-permitted adjustment. At present there is a difference between customs seals and seal plates. If the corresponding seal is no longer available then the safety valve (on the controller or the inflation hose and safety hose) is not allowed to be used any more. If the specialist has the corresponding measurement device as well as his own sealing pliers then he is allowed to re-seal the safety valve. Otherwise the safety valve must be exchanged for a new one.
Are you allowed to repair piston valves?
Generally, defective piston valves are only allowed to be maintained by a specialist. However, in order to exchange the sealing ring of the piston rod considerable time is required for the repair in addition to having the corresponding special tool. If material and time is calculated, it is generally better to exchange the complete piston valve.
Who is allowed to re-bond defective hoses?
If required, inflation hoses and air supply hoses can be fitted with new coupling components by a specialist. In doing this it is not necessary to use crimp sleeves because this requires a special tool; normal hosing sleeves can be used. Generally a repaired sleeve should be tested for leaks at 1.5 times the operating pressure.
Pipe and Test sealing Bags
When do pipe and test sealing pads need to be discarded?
There is no stipulated time specification for discarding the pipe and test sealing pads. Decisive for possibly-necessary discarding is the results of regularly scheduled, mandatory tests performed on the pipe and test sealing pads as per BGR 126, BGR 117, BGI 802, BetrSichV (German Operational Safety Code) and ArbSchG (German Industrial Safety Act ) and the manufacturer's testing regulations. For more information please refer to the operating instructions in the download section.
How do the pads need to be stored?
The sealing pads should always be stored, just like other rubber products, in accordance with DIN 7716 in a cool and dry place.
Can the pads be repaired?
Only corrective maintenance to a slight degree in case of small damage points in the area of the expandable pad surfaces is possible. A set of repair materials is available on request. The operating organisation can also easily replace connection couplings, etc.
What is the pad resistant to?
Pipe sealing pads and test sealing pads, just as with leakage sealing pads, are resistant to a number of acids, alkalines and solvents (see the chemical resistance list in the catalogue). You can request a detailed chemical resistance list from the manufacturer. We are glad to provide material samples for your own investigations of the chemical resistance.
Do the pads have to be braced?
Due to the water backpressure, pipe-sealing devices often have to withstand large pressure forces. For that reason the pad, especially when using large pipe dimensions, must be braced frictional to the pad. According to the UVV (Accident Prevention Standards), bracing is mandatory during pressure tests.
How can the coupling and the valve extension be replaced?
Connection couplings and valve extensions are fixated on the pad connecting thread with a two-component, synthetic-resin adhesive. To release them, this bond must be carefully heated with a hair dryer until the coupling can be easily unscrewed. While doing so, avoid directly heating up the rubber material. After that, screw the replacement coupling on again together with the adhesive and let it cure for at least 24 hours.
Can I uncouple the pad without it losing air?
Tube sealing pads and test sealing pads are, just as with leakage sealing pads, equipped with an automatically-closing connection coupling. If the filling hose is uncoupled, the valve automatically closes and the pad remains pressurised. The 1.5 and 2.5 bar filling hoses are also equipped with automatically-closing couplings.
What counter pressure do the pads withstand?
The amount of the max. counter pressure in the pipeline depends on many factors, e.g., the pipeline material, etc. 0.5 bar pipe sealing pads and testing pads are tested for a max. counter pressure of 2 m WC; 1.5 bar pipe sealing pads and testing pads are tested for a max. counter pressure of 5 m WC; the pads with working overpressures of 2.5 bar are tested for a counter pressure of 10 m WC. Please refer to the last page of the catalogue for exact information on the counter pressures.
How long can the pads remain in the channel?
No time limit is specified for the service life of sealing pads. During long deployments however, periodic checks, e.g. daily, of the working overpressure should be performed in the pads.