A mobile steam cleaning system

Abstract

The present invention discloses a mobile steam cleaning system to solve the technical problem of timely recycling and treating the wastewater and waste gas generated by steam cleaning at the cleaning target. The mobile steam cleaning system includes a movable steam cleaning platform, which is provided with a steam generating unit, a soft water supply unit and a fuel supply unit. In addition, it is provided with: a wastewater and waste gas collection unit, which is used to collect the wastewater and waste gas generated by steam cleaning at the cleaning target in real time; a gas-water separation cooling unit, which is used to connect the wastewater and waste gas to a treatment tower for water spray cooling and natural separation of gas and water from top to bottom, and the cooled gas and water flow out from the upper and lower parts of the treatment tower respectively; and a water treatment unit and an exhaust gas purification unit. The mobile steam cleaning system can timely collect and treat the wastewater and waste gas generated by steam cleaning at the cleaning target, thereby reducing the drainage operation after steam cleaning.

Description

Technical Field

[0001] The invention relates to a mobile cleaning system, in particular to a mobile steam cleaning system. The mobile steam cleaning system is suitable for cleaning underground tanks at gas stations and mobile oil tankers. Background Art

[0002] At present, there are two main cleaning methods for underground tanks and mobile tank trucks at gas stations, one is the manual cleaning method with high-pressure water jets, and the other is the steam fumigation tank cleaning method. The former cleaning method consumes a large amount of water, and the cleaning effect on the oil stains on the surface of the tank is not ideal. The latter cleaning method is to dissolve the oil stains on the surface of the tank through saturated steam under high temperature and high pressure and vaporize them, which can make the surface cleaned by saturated steam reach an ultra-clean state. At the same time, saturated steam can effectively cut into any tiny holes and cracks, peel off and remove the stains and residues therein, so this cleaning method has a better cleaning effect; however, since gasoline and diesel are used as the fuel for the steam generation unit, the combustion emissions will pollute the surrounding atmosphere. In addition, the wastewater and exhaust gas generated by steam cleaning in the tank body cannot be recovered and treated in time, which increases the difficulty of subsequent operations and pollution to the environment. Summary of the invention

[0003] The object of the present invention is to provide a mobile steam cleaning system to solve the technical problem of timely recycling and treating waste water and waste gas generated by steam cleaning at a cleaning target.

[0004] According to one aspect of the present invention, a mobile steam cleaning system is provided. The mobile steam cleaning system comprises a mobile steam cleaning platform, wherein the mobile steam cleaning platform is provided with: a steam generating unit, wherein the steam generating unit is used to heat soft water by burning fuel to generate saturated steam required for steam cleaning; a soft water supply unit, wherein the soft water supply unit is used to provide the steam generating unit with treated soft water required for steam generation; a fuel supply unit, wherein the fuel supply unit is used to provide the steam generating unit with fuel required for steam generation; a waste water and waste gas collecting unit, wherein the waste water and waste gas collecting unit is used to collect waste water and waste gas generated by steam cleaning at a cleaning target in real time; a gas-water separation cooling unit, wherein the gas-water separation cooling unit is used to connect the waste water and waste gas into a treatment tower for water spray cooling and natural separation of gas and water from top to bottom, wherein the cooled gas and water flow out from the upper part and the lower part of the treatment tower respectively; a water treatment unit, wherein the water treatment unit is used to purify the water flowing out of the treatment tower and reuse the purified water as cooling water for the treatment tower and / or transmit it to other application points; and an exhaust gas purification unit, wherein the exhaust gas purification unit is used to purify the gas flowing out of the treatment tower and then discharge it.

[0005] The above-mentioned mobile steam cleaning system includes a movable steam cleaning platform, and the steam generating unit, soft water supply unit, fuel supply unit, waste water and waste gas collection unit, gas-water separation cooling unit, water treatment unit and tail gas purification unit are arranged on the movable steam cleaning platform, so that it can be moved with the movable steam cleaning platform, thereby ensuring the mobility of the steam cleaning system. The above-mentioned mobile steam cleaning system utilizes the waste water and waste gas collection unit to collect the waste water and waste gas generated by steam cleaning at the cleaning target in real time, and these waste water and waste gas then enter the treatment tower of the gas-water separation cooling unit for water spray cooling and natural separation of gas and water from top to bottom, and the separated gas is then purified by the tail gas purification unit before being discharged, and the pollution to the environment is greatly reduced, and the separated water enters the water treatment unit for purification and the purified water is reused as cooling water in the treatment tower and / or transmitted to other application points, so as to realize the reuse of steam water. Since the mobile steam cleaning system can timely collect and process the wastewater and waste gas generated by steam cleaning at the cleaning target, it reduces the drainage work after steam cleaning; the wastewater and waste gas are cooled together, which not only saves equipment but also can fully recover the water in the waste gas and can also perform preliminary purification of the waste gas.

[0006] According to one aspect of the present invention, another mobile steam cleaning system is provided. The mobile steam cleaning system includes a movable steam cleaning platform, which is provided with: a steam generating unit, which is used to heat soft water by burning fuel to generate saturated steam required for steam cleaning; a soft water supply unit, which is used to provide the steam generating unit with treated soft water required for steam generation; a fuel supply unit, which is used to provide the steam generating unit with fuel required for steam generation; a waste water and waste gas collection unit, which is used to collect waste water and waste gas generated by steam cleaning at the cleaning target in real time; a gas-water separation cooling unit, which is used to cool the waste water and waste gas and separate gas and water, and the cooled gas and water flow out of the gas-water separation cooling unit respectively; a water treatment unit, which is used to purify the water flowing out of the gas-water separation cooling unit to help realize the reuse of the purified water; and an exhaust gas purification unit, which is used to purify the gas flowing out of the treatment tower and then discharge it.

[0007] The above-mentioned mobile steam cleaning system includes a movable steam cleaning platform, and the steam generation unit, soft water supply unit, fuel supply unit, waste water and waste gas collection unit, gas-water separation cooling unit, water treatment unit and tail gas purification unit are arranged on the movable steam cleaning platform, so it can be moved with the movable steam cleaning platform, ensuring the mobility of the steam cleaning system. The above-mentioned mobile steam cleaning system uses the waste water and waste gas collection unit to collect the waste water and waste gas generated by steam cleaning at the cleaning target in real time, and these waste water and waste gas then enter the gas-water separation cooling unit for cooling and gas-water separation together, and the separated gas is then discharged after purification treatment by the tail gas purification unit, and the pollution to the environment is greatly reduced, and the separated water enters the water treatment unit for purification treatment, thereby helping to realize the reuse of the purified water. Since the mobile steam cleaning system can collect and treat the waste water and waste gas generated by steam cleaning at the cleaning target in time, the drainage operation after steam cleaning is reduced; the waste water and waste gas are cooled together, which not only saves equipment but also can fully recover the water in the waste gas and can also preliminarily purify the waste gas.

[0008] The present invention is further described below in conjunction with the accompanying drawings and specific embodiments. Additional aspects and advantages of the present invention will be partially given in the following description, partially become apparent from the following description, or be learned through the practice of the present invention. BRIEF DESCRIPTION OF THE DRAWINGS

[0009] The drawings constituting a part of this specification are used to assist in understanding the relevant embodiments. The contents provided in the drawings and the related descriptions in this specification can be used to explain the present invention, but do not constitute improper limitations on the present invention. In the drawings:

[0010] Figure 1 It is a structural schematic diagram of an embodiment of a mobile steam cleaning system of the present invention.

[0011] Figure 2 It is a schematic diagram of the structure of the treatment tower in the embodiment of the mobile steam cleaning system of the present invention.

[0012] In the figure, a dotted line with an arrow indicates a flow path for gas, a solid line with an arrow indicates a flow path for liquid, and a dashed line with an arrow indicates a flow path for LNG (liquefied petroleum gas). DETAILED DESCRIPTION

[0013] The present invention is described clearly and completely below in conjunction with the accompanying drawings. A person skilled in the art will be able to implement the present invention based on these descriptions. Before describing the present invention in conjunction with the accompanying drawings, it should be particularly noted that:

[0014] The technical solutions and technical features provided in each part of this specification, including the following description, may be combined with each other unless there is a conflict.

[0015] The contents involved in the following description generally only involve a partial embodiment of the present invention rather than all the embodiments. Therefore, based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without making creative work should fall within the scope of protection of the present invention.

[0016] In this specification and claims and related sections, the terms "comprises," "comprising," "including," "having" and any variations thereof, are intended to cover a non-exclusive inclusion.

[0017] Figure 1 A schematic structural diagram of an embodiment of a mobile steam cleaning system of the present invention. Figure 2 It is a schematic diagram of the structure of the treatment tower in the embodiment of the mobile steam cleaning system of the present invention.

[0018] like Figure 1-2 As shown, a mobile steam cleaning system 100 is a mobile steam cleaning system for cleaning underground tanks and mobile tank trucks at gas stations, including a movable steam cleaning platform 101, wherein the movable steam cleaning platform 101 is provided with a steam generating unit 110, a soft water supply unit 120, a fuel supply unit 130, a wastewater and waste gas collection unit 140, an air-water separation and cooling unit 150, a water treatment unit 160, an exhaust gas purification unit 170 and a water flushing unit 180.

[0019] The steam generation unit 110 is used to heat soft water by burning fuel to generate saturated steam required for steam cleaning. The steam generation unit 110 is an existing one, and this embodiment preferably uses a steam generator using liquefied petroleum gas as fuel.

[0020] The soft water supply unit 120 is used to provide the steam generating unit with processed soft water required for steam generation. The soft water supply unit 120 is available in many types and brands of water softening equipment on the market, and can be selected according to the technical requirements of the steam generating unit 110.

[0021] The fuel supply unit 130 is used to provide the steam generating unit 110 with the fuel required for steam generation. In conjunction with a steam generator fueled by liquefied petroleum gas, the fuel supply unit 130 may be an LNG fuel tank. Of course, if the steam generating unit 110 is fueled by gasoline or diesel, the fuel supply unit 130 may be a tank of the corresponding oil.

[0022] The wastewater and waste gas collection unit 140 is used to collect wastewater and waste gas generated by steam cleaning at the cleaning target in real time. Here, "real time" means that the steam cleaning operation and the operation of collecting wastewater and waste gas generated by steam cleaning at the cleaning target are basically carried out continuously, but there is a necessary response time.

[0023] When the mobile steam cleaning system is a mobile steam cleaning system for cleaning underground tanks at gas stations and mobile tank trucks, the wastewater and waste gas generated by steam cleaning can be directly introduced into the wastewater and waste gas collection unit 140 through the existing outlet on the tank body and through a pipeline.

[0024] In this embodiment, the wastewater and waste gas collection unit 140 includes a waste gas recovery flow path and a waste water recovery flow path, wherein the waste gas recovery flow path is mainly composed of a waste gas recovery pipeline, a fan 141 and a waste gas discharge pipeline connected in sequence, and the waste water recovery flow path is mainly composed of a waste water recovery pipeline, a water pump 142 and a waste water discharge pipeline connected in sequence. As a further improvement to this embodiment, an intermediate container may be further provided on the waste gas recovery flow path and / or the waste water recovery flow path to temporarily store the recovered waste gas and / or waste water.

[0025] The gas-water separation cooling unit 150 is used to cool the wastewater and waste gas and separate the gas and water, and the cooled gas and water flow out of the gas-water separation cooling unit 150. Specifically, the gas-water separation cooling unit 150 has a treatment tower 151 for receiving the wastewater and waste gas for water spray cooling and natural separation of gas and water.

[0026] The processing tower 151 adopts a tower design, and the processing space is expanded as much as possible in the height direction, so as to ensure that the floor space of the processing tower 151 is appropriate, which is conducive to the arrangement and installation of equipment on the movable steam cleaning platform 101. In addition, the internal processing space of the processing tower 151 is mainly expanded vertically, which is conducive to water spray cooling and natural separation of air and water.

[0027] The water treatment unit 160 is used to purify the water flowing out of the treatment tower 151 and reuse the purified water as cooling water in the treatment tower 151 and / or to other application points. The water treatment unit 160 is also available. Many different types and brands of water purification equipment can be found on the market, and can be selected according to the technical requirements of water purification. In this embodiment, a filter cartridge filter is specifically used to microfilter the water to ensure that the filtered water reaches an ideal cleanliness.

[0028] In this embodiment, the "other application points" include a water flushing unit 180, which is connected to the water treatment unit 160 so as to use purified water as flushing water, so as to use water flushing in conjunction with steam cleaning.

[0029] The tail gas purification unit 170 is used to purify the gas flowing out of the treatment tower 151 before discharging. The tail gas purification unit 170 is also existing. Many different types and brands of gas purification equipment can be found on the market, and can be selected according to the technical requirements of gas purification. In this embodiment, a bag filter is specifically used.

[0030] It can be seen that the above-mentioned mobile steam cleaning system 100 includes a movable steam cleaning platform 101, and the steam generating unit 110, the soft water supply unit 120, the fuel supply unit 130, the wastewater and exhaust gas collection unit 140, the gas-water separation and cooling unit 150, the water treatment unit 160 and the exhaust gas purification unit 170 are arranged on the movable steam cleaning platform 101, so it can be moved with the movable steam cleaning platform 101, ensuring the mobility of the steam cleaning system.

[0031] The movable steam cleaning platform 101 may be mainly composed of a chassis of a trailer. In this case, the movable steam cleaning platform 101 may include a wheel system 102 .

[0032] The above-mentioned mobile steam cleaning system 100 utilizes the wastewater and waste gas collection unit 140 to collect the wastewater and waste gas generated by steam cleaning at the cleaning target in real time. These wastewater and waste gas then enter the treatment tower 151 of the gas-water separation cooling unit 150 for water spray cooling and natural separation of gas and water. The separated gas is then purified by the exhaust gas purification unit 170 and discharged, and the pollution to the environment is greatly reduced. The separated water enters the water treatment unit 160 for purification and the purified water is reused as cooling water in the treatment tower 151 and / or transmitted to other application points, which can realize the reuse of steam water. Since the mobile steam cleaning system 100 can timely collect and treat the wastewater and waste gas generated by steam cleaning at the cleaning target, the drainage operation after steam cleaning is reduced.

[0033] Since the mobile steam cleaning system can timely collect and process the wastewater and waste gas generated by steam cleaning at the cleaning target, it reduces the drainage work after steam cleaning; the wastewater and waste gas are cooled together, which not only saves equipment but also can fully recover the water in the waste gas and can also perform preliminary purification of the waste gas.

[0034] like Figure 2As shown, in a specific embodiment, the treatment tower 151 includes a water collection area A, an air-water mixing area B, an air flow spray cooling area C, an air flow demisting area D and an air flow discharge area E arranged in sequence from bottom to top along the height direction of the treatment tower 151; the treatment tower 151 is respectively provided with a drain port connected to the water treatment unit 160, a waste gas input port 151B connected to the waste gas outlet of the wastewater and waste gas collection unit 140, a wastewater input port 151A connected to the wastewater outlet of the wastewater and waste gas collection unit 140 and a waste gas purification unit 17. 0 connected, a water sprinkler 151F and a demister 151G are provided in the treatment tower; the drain outlet is located in the water collection area A, the waste gas input port 151B is located between the upper part of the water collection area A and the lower part of the air-water mixing area B, the waste water input port 151A is located between the upper part of the air-water mixing area B and the lower part of the air flow spray cooling area C, the exhaust port 151E is located in the air flow discharge area E, the water sprinkler 151F is arranged in the air flow spray cooling area C, and the demister 151G is located in the air flow demister area D.

[0035] Specifically, in the treatment tower 151, the demister 151G adopts a baffle demister, and the inlet of the baffle demister is arranged horizontally above the water sprinkler.

[0036] Specifically, in the treatment tower 151, the drain port includes an overflow port 151C close to the upper part of the water collection area A, the overflow port 151C is connected to the water sprinkler 151F through a water circulation pipeline, and a control valve is installed on the overflow port 151C, which is opened when the water level in the water collection area reaches a set threshold and closed when it does not reach the set threshold; and the drain port also includes a drainage and sewage discharge structure 151D located at the lower part of the water collection area A. The control valve is preferably a float control valve 151H, and the float control valve 151H is connected to a float located on the water surface of the water collection area.

[0037] The working principle of the above-mentioned treatment tower 151 is as follows: wastewater and waste gas enter the interior of the treatment tower 151 from the wastewater input port 151A and the waste gas input port 151B respectively, the wastewater passes through the gas-water mixing zone B from top to bottom, and the waste gas passes through the gas-water mixing zone B from bottom to top. At the same time, the cooling water sprayed from the water sprinkler 151F moves from top to bottom to cool the waste gas and wastewater and enters the water collection area A together with the cooled wastewater. The cooled waste gas moves upward to the demister 151G above the water sprinkler 151F for further gas-water separation, and the gas finally enters the airflow discharge area E and is discharged from the exhaust port 151E, while the water in the water collection area A is discharged through the drain port (when the water level in the water collection area A reaches the set threshold, the water flows out from the overflow port 151C, and the drainage and sewage structure 151D can be opened for drainage and / or sewage when necessary).

[0038] It can be seen that the above-mentioned treatment tower 151 has a simple structure but can effectively realize the cooling of waste gas and wastewater, separation of waste gas and wastewater, preliminary purification of waste gas (achieved by water spraying), waste gas demisting (creating favorable conditions for subsequent exhaust gas purification), exhaust, drainage and sewage discharge, and the design is relatively ingenious.

[0039] like Figure 1 As shown, in order to improve the compactness of the equipment layout on the movable steam cleaning platform 101, the soft water supply unit 120 can adopt a water softener, the water treatment unit 160 can adopt a water filter, and the water softener and the water filter can be integrated and installed in the same shell to form a water treatment box 104; and, the fuel supply unit 130 can adopt an LNG fuel tank, the steam generating unit 110 can adopt a steam generator fueled by liquefied petroleum gas, and the exhaust gas purification unit 170 can adopt an exhaust gas filter, and the LNG fuel tank and the exhaust gas filter can be integrated and installed in the same shell to form a gas treatment box 103.

[0040] The water softener and the water filter are both pressure vessels for treating water. The water softener and the water filter can be integrated and installed in the same housing to form a water treatment box 104. In fact, the same housing is used, which not only improves the compactness of the relevant equipment, but also saves the manufacturing cost of the equipment. Similarly, a similar effect can be produced through the gas treatment box 103.

[0041] Furthermore, the water treatment box 103 and the gas treatment box 104 can be arranged in parallel along the width direction of the movable steam cleaning platform 101 to form a first equipment column, and the first equipment column is arranged at the front end of the length direction of the movable steam cleaning platform 101; the waste water and waste gas collection unit 140 and the gas-water separation cooling unit 150 are arranged in parallel along the width direction of the movable steam cleaning platform 101 to form a second equipment column, and the second equipment column is arranged beside the first equipment column; the steam generator is arranged at the rear end of the length direction of the movable steam cleaning platform 101, and a water flushing unit 180 for flushing the cleaning target is arranged between the second equipment column and the steam generator on the movable steam cleaning platform 101, and the water flushing unit 180 is connected to the water treatment unit 160 so as to use the purified water as flushing water. The above arrangement makes the first equipment column as far away from the steam generation unit as possible, reducing the safety risk of use; on this basis, the flow path of gas and water is shortened as much as possible to save energy consumption.

[0042] In addition, the movable steam cleaning platform 101 is provided with a vacuum suction unit 190 for vacuum suction of the cleaning target and a power generation unit 1100 for powering the movable steam cleaning platform 101, respectively, between the water flushing unit 180 and the steam generator 110. The vacuum suction unit 190 is already available, and is particularly common in cleaning equipment for underground tanks at gas stations and mobile tank trucks. Its main function is to absorb contaminated oil and other contaminants in the tank by generating negative pressure. The power generation unit 1100 can power the movable steam cleaning platform 101, thereby improving the convenience of using the mobile steam cleaning system.

[0043] The above is a description of the relevant contents of the present invention. A person skilled in the art will be able to implement the present invention based on these descriptions. Based on the above contents of this specification, all other embodiments obtained by a person skilled in the art without making any creative work shall fall within the scope of protection of the present invention.

Claims

1. A mobile steam cleaning system, comprising a movable steam cleaning platform, wherein the movable steam cleaning platform is provided with: A steam generating unit, the steam generating unit is used to generate saturated steam required for steam cleaning by heating soft water by burning fuel; a soft water supply unit, the soft water supply unit being used to provide the steam generating unit with treated soft water required for steam generation; A fuel supply unit, the fuel supply unit is used to provide the steam generating unit with fuel required for steam generation; It is characterized in that The movable steam cleaning platform is also provided with: A wastewater and waste gas collection unit, the wastewater and waste gas collection unit is used to collect wastewater and waste gas generated by steam cleaning at the cleaning target in real time; An air-water separation cooling unit, which is used to connect the wastewater and waste gas to the treatment tower for water spray cooling and natural separation of air and water, and the cooled gas and water flow out from the upper and lower parts of the treatment tower respectively; a water treatment unit for purifying water flowing out of the treatment tower and recycling the purified water as cooling water to the treatment tower and / or transmitting the purified water to other application points; and An exhaust gas purification unit, which is used to purify the gas flowing out of the treatment tower before discharging; The interior of the treatment tower includes a water collection area, an air-water mixing area, an airflow spray cooling area, an airflow demisting area and an airflow discharge area which are arranged in sequence from bottom to top along the height direction of the treatment tower; The treatment tower is respectively provided with a drain port connected to the water treatment unit, a waste gas input port connected to the waste gas outlet of the waste water and waste gas collection unit, a waste water input port connected to the waste water outlet of the waste water and waste gas collection unit, and an exhaust port connected to the tail gas purification unit, and a water sprayer and a demister are provided in the treatment tower; Furthermore, the drain port is located in the water collection area, the waste gas input port is located between the upper part of the water collection area and the lower part of the air-water mixing area, the waste water input port is located between the upper part of the air-water mixing area and the lower part of the air flow spray cooling area, the exhaust port is located in the air flow discharge area, the water sprayer is arranged in the air flow spray cooling area, and the demister is located in the air flow demister area; The drain outlet includes an overflow outlet close to the upper part of the water collection area, the overflow outlet is connected to the water sprinkler through a water circulation pipeline, and a control valve is installed on the overflow outlet, which is opened when the water level in the water collection area reaches a set threshold and closed when it does not reach the set threshold; the drain outlet includes a drainage and sewage discharge structure located at the lower part of the water collection area; The wastewater and waste gas collection unit includes a waste gas recovery flow path and a wastewater recovery flow path. The waste gas recovery flow path is mainly composed of a waste gas recovery pipe, a fan and a waste gas exhaust pipe connected in sequence. The wastewater recovery flow path is mainly composed of a wastewater recovery pipe, a water pump and a wastewater exhaust pipe connected in sequence. The waste gas exhaust pipe is connected to the waste gas input port of the treatment tower, and the wastewater exhaust pipe is connected to the wastewater input port of the treatment tower.

2. The mobile steam cleaning system according to claim 1, characterized in that: The demister adopts a baffle demister, and the inlet of the baffle demister is arranged horizontally above the water sprinkler.

3. The mobile steam cleaning system according to claim 1, characterized in that: The control valve is a float control valve, which is connected to a float located on the water surface of the water collection area.

4. The mobile steam cleaning system according to claim 1, characterized in that: The soft water supply unit adopts a water softener, the water treatment unit adopts a water filter, and the water softener and the water filter are integrated and installed in the same housing to form a water treatment box; and / or, The fuel supply unit adopts an LNG fuel tank, the steam generation unit adopts a steam generator using liquefied petroleum gas as fuel, the exhaust gas purification unit adopts an exhaust gas filter, and the LNG fuel tank and the exhaust gas filter are integrated and installed in the same shell to form a gas processing box.

5. The mobile steam cleaning system according to claim 4, characterized in that: The water treatment box and the gas treatment box are arranged side by side along the width direction of the movable steam cleaning platform to form a first equipment row, and the first equipment row is arranged at the front end of the movable steam cleaning platform in the length direction; The wastewater and waste gas collection unit and the gas-water separation cooling unit are arranged in parallel along the width direction of the movable steam cleaning platform to form a second equipment row, and the second equipment row is arranged beside the first equipment row; The steam generator is arranged at the rear end of the length direction of the movable steam cleaning platform. A water flushing unit for flushing the cleaning target is arranged between the second equipment column and the steam generator on the movable steam cleaning platform. The water flushing unit is connected to the water treatment unit so as to use purified water as flushing water.

6. The mobile steam cleaning system according to claim 5, characterized in that: A vacuum suction unit for vacuum suction of the cleaning target and a power generation unit for supplying power to the movable steam cleaning platform are respectively provided between the water flushing unit and the steam generator.

7. The mobile steam cleaning system according to any one of claims 1 to 6, characterized in that: It is a mobile steam cleaning system used for cleaning underground tanks at gas stations and mobile tank trucks.

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