GB2160157A - Transport tank for service vehicles - Google Patents

Abstract

A self supporting transport tank for reception of fluids or powder and for use for example in a fire service vehicle and having at least three mounting points (18) is assembled in mechanically secure and hermetic manner from plate-like endwalls (4), a floor (5), a roof (6) and contoured sidewalls. The sidewalls (2, 3) comprise several sections (11-14) spaced apart from each other in a direction between the endwalls and recessed towards a central longitudinal axis (10) of the tank. The recesses (11-14) may be of part cylindrical form or flat sided, and reinforcing elements (27) may be situated between adjacent recesses in the tank sidewalls (2, 3). Suitably the endwalls (4), sidewalls (2, 3), the roof (6) and floor (5) are produced from glass-fibre reinforced plastics and the mounting means (18) are suitably incorporated in the floor as metal plates. <IMAGE>

Description

SPECIFICATION Transport tank for service vehicles The invention relates to a self-supporting transport tank for reception of powders or fluids, having at least three fastening points, which is assembled from substantially plate-like end walls, floor and roof elements and contoured sidewalls, in mechanically secure and hermetic manner.

Different transport containers are already known, according to DE-A-19 19 491, which are combined from two or more container shapes closed at one extremity. These transport containers intended for a road tanker consist of fibre-reinforced plastics material and are produced by coating appropriate moulds with fibre- reinforced plastics material. Following the production of the separate components, these are assembled into a transport container and are joined together complementarily at connection points by being coated with fibre-reinforced plastics material.

Furthermore, it is already known from DE-A-21 08 216 to produce a housing for a transport container from preshaped thermally insulated wall elements, one wall element overlapping the other at the edges of the housing. For secure connection of the separate wall elements, the corner sections are filled with liquid sealant or adhesive.

A transport container consisting of GR(glass reinforced plastics) is also known from DE-B-25 15 567 which comprises several prefabricated and in particular plane-surfaced container elements.

These container elements are bonded to each other at the seams by means of synthetic resin. To reinforce the container which is utilised as an extinguisher fluid tank for a fire service vehicle, the load-carrying container elements are joined together by means of slots and lugs incorporated therein, the lugs of one container element being inserted into the slots of another container element. The seal between the slots and lugs is difficult to maintain because of the differential expansions of the container elements and because of the vibrational stresses incurred upon utilising such transport containers on vehicles. Furthermore, a container of this kind requires the incorporation of several supporting plates within its internal volume and extending longitudinally and transversely thereto, to secure the required strength of the transport container.

It is an object of the present invention to provide a transport container which may be produced economically from varied materials and which possesses high strength and is such that other items of equipment may be installed and secured thereon.

The problem of the present invention is resolved in that at least the sidewalls comprise several sections which are spaced apart from each other in the direction between the end walls and are recessed towards a central longitudinal axis of the transport tank. The advantage of this layout consists in that a sectional reinforcement of the transport container is obtained by imparting a shape to the sidewalls, and that other items of equipment or components may be accommodated within the recessed sections which may be curved for the purpose of reinforcement. It is possible in uncomplicated manner to make use of straight reinforcing elements extending straight throughout these regions.Although it is already known that si- dewalls of transport containers may be provided with indentations or uninterrupted corrugations for reinforcement thereof, these corrugations or folds commonly extend parallel to the central longitudinal axis of the transport container and throughout its whole length. The incorporation of reinforcing elements as well as of internal components if appropriate, in the transport containers, is rendered very difficult thereby. A surge inhibition, for example upon starting off or decelerating a vehicle, is secured by means of the recessed section and the different tank cross-sections produced thereby in the longitudinal direction which is suitably the direction of travel when installed in a vehicle. The number of internal surge walls or baffles may thereby be reduced, or their installation may be obviated.A transport tank of this kind may advantageously be utilised as an extinguisher fluid tank for fire service vehicles since it may be produced at lost cost and low weight.

Provision is made according to another feature of the invention that the recessed sections of the transport tank may be formed by approximately cylindrical recesses which at right angles upright axes have a cross-section of a circular segment having an arc height smaller than a radius. Thanks to the spatial curvature of the sidewalls of the transport container, a reinforcement is obtained in horizontal as well as vertical directions, thereby increasing the strength of the container without installation of complementary reinforcing elements.

According to another advantageous embodiment of the invention, it is arranged for the axes of the recesses to be approximately at right angles to the floor of the transport tank and to extend throughout the height of the sidewalls. In view of the successive cylindrical recesses, a displacement of liquid for example extinguisher liquid in the longitudinal direction of the transport container and at right angles to the longitudinal axis of these cylinders causes consecutive compression and expansion of the liquid and the forming of turbulence which acts against the initiation of a surge.In practice, the turbulence forms a counterforce against the extinguisher fluid accelerated in one direction, whereby a circular flow and counterflow may be generated in the wider tank section by impingement of the extinguisher fluid volumes led through the narrower cross-section between the curved walls.

It is advantageous if several recesses are arranged one behind another in the direction of the central longitudinal axis of the transport tank, notional points of intersection of curved surfaces of the adjacent recesses being situated outside the transport tank and spaced from the sidewalls, since reinforcing sections are provided between adjacent recesses.

Within the ambit of the invention, it is also possible to provide reinforcing elements at least in the sidewalls, between the adjacent recesses. Reinforced end sections may be exploited for installation or fastening of auxiliary equipment.

It is also possible to provide reinforcing elements in terminal areas of the sidewalls facing towards the endwalls andlor in the endwalls, and these reinforcing elements may accommodate coupling elements of external coupling devices so that the securing forces are ducted into the reinforcing elements and the wall elements of the transport tank are not loaded thereby.

According to another embodiment of the invention, it is provided that the endwalls, sidewalls, the roof element and the floor element are produced from GRand that the floor element incorporates carrying frame elements, having at least three areally distributed bearing points for fastening elements. Thanks to constructing the tank of plastics material or GRP, the risk of corrosion by chlorides forming in stored water or by water containing minerals, which may for example also have high electrical conductivity values, is reduced or obviated. Furthermore, a distortion- free three-point suspension of the transport container may moreover be secured by this design.

It is also possible according to the invention that the bearing points may be formed by metal elements, e.g. thick-walled metal plates or the like, which are installed facing the external covering surface, thereby obviating through-bores in the container walls and thereby assuring the hermeticity of the transport container or tank.

In a modified embodiment of the invention a section of each sidewall is recessed towards the middle of a vehicle on which the tank is mounted by a distance which corresponds approximately to a depth of equipment modules installed in the region of sides of the vehicle, a distance between the recessed sections on opposite sides being greater than a clearance between two longitudinal stringers of a chassis frame of the vehicle. A complementary reinforcement of a transport tank of this kind is secured by the recessing of particular sections with respect to the sidewalls.

It is also advantageous if the recessed sections of the sidewalls have further sections situated in an area facing towards the floor of the transport tank and displaced towards the centre of the vehicle beyond the recessed sections, a spacing between these two other sections at right angles to the sidewall being smaller than a clearance between longitudinal stringers of the chassis frame, since the floor section of the transport tank is complementarily reinforced thereby and the mounting and fastening of the transport tank on the chassis frame are simplified thereby.

It is advantageous to provide reinforcing angles extending parallel to the sidewalls and having respective flanges extending parallel to the base of the transport tank and parallel to sides of the recessed sections and situated in edge sections connecting the two recessed sections of the sidewalls to the base or floor, so that apart from comple mentarily increasing the rigidity of the edge sections between the different walls of the transport tank, these reinforced sections may at the same time be co-opted for securing the transport tank on the chassis frame.

A modified embodiment is advantageous, according to which the wall sections of plane area of the sidewalls and/or endwalls, as well as of the recessed sections are constructed as sandwich elements and preferably have a panel of expanded plastics material acting as a bearer element between two covering layers consisting of GRP, since bulging of the walls upon charging the transport tank and during high sideways accelerations, such as could always occur during an operational journey in the case of a service vehicle, may be prevented thereby in a weight-saving manner.

Suitably the wall sections reinforced with bearer elements are joined with high-strength strips or mats situated in the GRP, for example carbon fibres, to provide reinforcing inserts, and thereby retaining uncomplicated processing of the materials and an uncomplicated production sequence of the transport tank, whilst nevertheless securing a high-strength edge joint and an additional assurance against the occurrence of cracks in the edge sections.

It is also possible within the scope of the invention that the sidewalls have a spacing in the direction at right angles to each other which corresponds approximately to a distance between opposite sides of a service vehicle receiving the transport tank, and the recessed sections receive equipment modules provided in the region of the vehicle sides, the tank being of generaliy T-shaped form. This allows the reaction forces to be divided in uncomplicated manner in the region of the sections of the transport tank extending between the two sides of the vehicle across the chassis frame and an optional extension of the part of the transport tank extending between the equipment modules and forming the stem of the T-form may be provided for so that the same may be adapted to different desired capacities.

The invention will now be described, by way of example, with reference to the accompanying partly diagrammatic drawings, in which: Figure 1 is a simplified diagrammatical illustration of part of a transport tank constructed according to the invention; Figure 2 is a simplified diagrammatic plan view of a transport tank according to the invention with auxiliary equipment secured thereon; Figure 3 is a fragmentary plan view of a modified arrangement of displaced sections in the sidewalls of a transport tank according to the invention; Figure 4 is a partially sectional side elevation taken along the lines IV-IV in Figure 5 of a modified embodiment of a transport tank constructed according to the invention; Figure 5 is a plan view of the transport tank of Figure 4, arranged on a chassis frame of a service vehicle;; Figure 6 is a partly sectional end view of the transport tank of Figures 4 and 5 taken along the lines VI-VI of Figure 5; Figure 7 is an edge section of a transport tank in cross-section.

In Figure 1 is illustrated a self-supporting transport container or tank 1 which is constructed in mechanically secured and hermetically sealed manner from sidewalls 2,3, end walls 4, a base element 5 and a roof element 6. The individual walls or wall elements suitably consist of flanged or edged steel sheet or of GRP. Walls of plastics material may if desired be constructed as sandwich elements, filling materials such as expanded polyurethane panels, for example, being inserted between separated glass-fibre reinforced plastics material layers.In this connection, the production of the transport tanks is commonly performed in such manner that the roof element 6 is installed in the manner of a box lid on unitary component comprising the two sidewalls 2,3, the endwalls 4 and the base element 5, and is joined in mechanically secured and hermetically sealed manner to the sidewalls 2,3 and the endwalls 4. At least one opening, e.g. a manhole 7 allowing for access to the internal volume of the transport tank 1 is commonly provided in the roof element 6, so that the connection of the separate parts may also be performed from the inside during the production of the transport tank and that cleaning or repair is possible whilst the transport tank is in service.Furthermore, if the transport tank 1 is utilised as an extinguisher fluid tank for a fire service vehicle, a suction or intake pipe 8 is placed above the floor element 5 within said tank 1, and which is provided with a coupling flange for external connection to a post-connected pump. A draining aperture 9 is also provided in the floor element 5, through which the transport tank 1 may be flushed through and cleaned.

Sections 11,12,13,14 which are inwardly displaced with respect to the sidewalls 2,3 in the direction of a central longitudinal axis 10 are situated at intervals along the sidewalls 2,3 of the transport tank 1 in a direction at right angles to the endwalls and parallel to a central longitudinal axis 10. Sections 11,12 are spaced apart from adjacent sections 13,14 in the direction of the central longitudinal axis 10 by a corresponding distance 15. At least the floor element 5 is reinforced by reinforcing elements 16, e.g. comprising carrying or bearer frame elements or the like, and which provide fastening elements 17 for bearing points 18 of the transport tank 1, for example on a chassis frame 19 of a vehicle.Between the fastening elements 17 and the chassis frame 19 are situated elastic support elements 20 which allow for movement mobility of the chassis fpme 19 with respect to the rigid transport tank 1.

As shown in Figure 2 the sections 11,12,13,14 are formed by part cylindrical recesses 21 of arcuate circular segmental section in plan view and having upright central axes 22. An arc height 23 of each circular segment is smaller than a radius 24 in the embodiment shown.

In the embodiment according to Figures 1 and 2, the central longitudinal axes 22 of the sections 1114 extend substantially at right angles to the floor element 5 and extend throughout the height of the sidewalls 2,3. The central longitudinal axes 22 of mutually adjacent sections 11,13 and 12,14 are situated at a distance 25 from each other at which the points of intersection of the curved surfaces of the sections 11,13 and 12,14 are situated outside the sidewalls 2,3, meaning that the sections closest to each other of the mutually directly adjacent sections 11,13 and 12,14 are spaced apart from each other in the direction of the central longitudinal axis of the transport tank 1.

Sidewall sections 26 of plane area are thus left between adjacent recessed sections 11,13 and 12,14. As shown in Figure 2, reinforcing elements, for example U-sections 28, may be installed in these sidewall sections internally of the tank. If the transport container or tank is produced from glassfibre-reinforced plastics material, these reinforcing elements may preferably be co-laminated into the plastics material laminate, thereby establishing an intimate joint between the walls of the transport tank 1 and the reinforcing elements 27. At the same time, the hermeticity of the transport tank 1 between the internal volume 29 and the outside is assured.As shown in the case of the reinforcing element 27 illustrated as a co-laminated U-section 28 between the sections 12 and 14 - the roof element being removed in this area - a carrying frame 31 for equipment module chests 32 may be secured by means of connecting elements 30, e.g.

screws or the like. The connecting elements 30, or the screws forming these, are inserted into blind holes of the reinforcing elements 27, to which end the U-section is suitably reinforced by means, for example, of an appropriate flat iron insert.

Through-bores should be avoided so that the hermeticity of the transport tank is not affected. Advantageously it is also possible to secure lugs or coupling elements of quick-release connectors on the reinforcing elements 27 by means of several connecting elements 30, and to suspend or install the carrying frame 31 in these coupling elements or connectors.

As apparent from Figure 2 three bearing points 18 are provided in the base element 5, so that a three-point suspension may be established by means of the elastic support elements 20, depicted in Figure 1, and thus a statically defined system for connection between a transport tank and a chassis frame 19 of a vehicle.

As further apparent in the area of the right-hand side endwall 4 of the transport tank 1, reinforcing elements 27, for example integrated with lugs or the like may also be installed at least in the edge sections between the endwall and sidewalls 2,3, so that equipment modules or carrying frames for pumps, hose reels or the like may be installed in the area of the end wall. In the case of all these reinforcing elements and bearing points, it should be considered that these should be secured directly beneath the outer covering layer - if the transport tank is produced from GR- and otherwise externally on the tank, to assure the hermeticity of the transport tank 1. These reinforcing elements may moreover be formed by various materials and sections.It is thus possible to replace the metal sections described by aluminium sections, plastics material sections with appropriate metal inserts which are formed in unit therewith, wooden elements or the like. It need merely be assured that these materials cannot be attacked by the fluid contained in the internal volume 29 of the transport tank 1 or are appropriately protected against such an attack.

In a modified embodiment in Figure 3 is shown a transport tank 33 which is provided in sidewalls 38 with sidewall recesses 34-37 situated at intervals along the central longitudinal axis 10. These recesses have flat inner sides formed parallel to the central longitudinal axis 10 and extend inwardly of the sidewall 38 towards the internal volume of the transport tank 33. The recesses 34-37 are separated from each other in the longitudinal direction of the central longitudinal axis 10 by sidewall sections 39 of substantially plane surface. The advantage of this arrangement consists in that the sidewall is equally reinforced in horizontal and vertical direction according to the disclosures in Figures 1 and 2, by being appropriately shaped.

Another advantage of the design of a transport tank according to the disclosures in Figures 1 to 3 consists in that when transporting liquids the constriction by areas of reduced cross-section of the transport tank 1 or 33 to a width 40 or 41, and the subsequent enlargement to a width 42 or 43, inhibits or diminishes the surging movement in the di rection of the endwall 4 situated in the direction of deceleration during violent displacements of the transport tank 1,33 in the direction of the central longitudinal axis 10. This is accompiished by build up of a counterflow which is engendered by the different widths, namely by transition from the width 42 and 43 to the width 40 and 41 and generates a damming or barrier force which acts against the surge effect.This damming force or counterflow is also intensified by the fact that after passing through the narrower cross-section and the subsequent cross-sectional enlargement, the flowing liquid impinges on the wall sections of the transport tank 1 which subsequently narrow again, is deflected thereat and that this causes a kind of vortex generation in the liquid which also comple mentarily acts against the onset of a surge.

In the case of a design of this kind of a transport tank, it is possible as a result to install fewer baffles or baffles of lesser size or to omit these com pletely, thereby securing a saving on labour and a simplification in the structure of the transport tank 1 or 33.

A transport tank 44 comprising endwalls 45,46, a top 47, a base 48 and sidewalls 49,50, is shown in Figures 4 to 6.

In the region of the top 47, the transport tank 44 has a flange 51 closed by a lid whilst carrying liquids in the transport tank 44. The lid may be removed for maintenance purposes, so that the inside of the transport tank 44 may be entered. As further apparent from these Figures, the transport tank 44 comprises sections 56 and 57 which are recessed or set back with respect to the sidewalls 49,50, towards the longitudinal central axis 55 extending centrally between stringers 52 of a chassis frame 53 of a service vehicle 54. With respect to these sections 56,57 recessed towards the central longitudinal axis 55 other lower sections 58 - as best apparent from Figure 6 - are additionally also set back in the direction of the central longitudinal axis 55 with respect to the sections 56,57.

As also apparent from Figure 6, a distance 59 between the other sections 58 and extending at right angles to the sidewalls 49 and 50 is a little smaller than a clearance 60 between the two stringers 52 of the chassis frame 53. A distance 61 between the sections 56,57 which are less set back with respect to the sidewalls 49 and 50 is a little greater than the clearance 60 between the facing sides of the stringers 52. In the same way, a distance 62 between the sidewalls 49 and 50 and the set back sections 56 and 57 corresponds approximately to a depth 63 of equipment modules 64 which in conjunction with the sidewalls 49,50 form the sides 65 of the service vehicle 54.Thanks to this form of the transport tank 44, which is approximately T-shaped in plan view, an even weight distribution of the weight of the transport tank on the two stringers 52 is obtained and a stable mounting of the same on the chassis frame 53 is secured. Thanks to the other sections set back with respect to the sidewalls 49,50, the transport tank 44 is located and secured on the chassis frame 53 in the direction at right angles to the central longitudinal axis 55.

Furthermore, a comparatively small area only is required for the transport tank 44 in the area of the sides 65 of the service vehicle 64, thus leaving the highly accessible areas in the region of sides 65 of the service vehicle for stowage of commonly very bulky items of equipment. At the same time, the additional sections 58 form a suction sump in the area of the base 48 of the transport tank 44, from which a suction pipe 66 extends in the direction of one of the end walls 45. A pump, or an intermediate pipe leading to a pump, may suitably be connected in this region. An overflow pipe 67 passing through the transport tank 44 is provided to prevent pressure accumulation in the transport tank and to draw fluid issuing from the top 68 of the transport tank 44 off to the underside, i.e. below the chassis frame 53.

As also apparent from these Figures, a reinforcing angles 69 wherein are mounted fastening means 70 which connect the transport tank 44 to the chassis frame 53 via elastic intermediate bearers 71, is co-laminated in the edge section between the base 48 and the sections 56,57 set back with respect to the sidewalls 49,50.

To secure an adequate strength of the planar wall sections in the area of the sidewalls and endwalls 49,50 and 45,46 as well as of the set back sections 56,57, these planar wall sections are constructed as sandwich elements. These comprise two covering layers 72,73 formed from GRP, between which is situated a bearer element 74.

A cross-section through an edge section or an area of transition between the section 56 and the rear endwall 46 is shown in Figure 7 to enlarged scale but in simplified diagrammatical illustration.

As apparent, outer and inner covering layers 72 and 73 consist of plastics material, a polyester resin or the like, reinforced with glass fibre mat, condenser yarn or the like. After applying an inner covering layer 73 on a mould, the planar wall sections are reinforced by application of support elements 74, which may for example be formed by expanded plastics material plates for example of expanded polyurethane, whereupon another outer covering layer 72 of GRis applied. These support elements 74 are thereby clamped between the outer and inner covering layers 72,73 and, as considered in a static mode, what is formed is a bearer or beam having two mutually spaced apart flanges.

As also apparent from Figures 4 and 7, a complementary reinforcing insert 75 which may for example be formed by a mat or strip of high-strength fibres, for example carbon fibres of the like, may be provided between the support elements 74 and the outer and inner covering layers 72,73. By an appropriate enveloping arrangement of this reinforcing insert 75, as shown in Figure 4 by an overlapping arrangement over the endwalls, sidewalls and the set back sections or an enveloping or overlapping arrangement between the base 48 and top 47 as well as the sections 56 and 57 of the transport tank 44, it is possible to obtain a structure of high strength and a relief of stress on the edge sections not reinforced by the support elements 74 - as apparent from Figure 7.

Another advantage of this T-shaped tank layout consists in that by simply varying the height or length of the tank portion extending parallel to the central longitudinal axis 55, the tank capacity may be adapted to different requirements in uncomplicated manner, in which connection the fundamental design of the tank may however always remain the same. The other sections 58, for example a driving engine or the like may thus also be provided between the equipment modules immediately following the suction sump. It is also possible to lead the suction pipe in the direction of the endwall 46, that is to say the stern-side section of the service vehicle 54, and to install an extinguisher fluid pump directly thereon. As apparent from Figure 5, a driver's cab 76 or other equipment modules of the service vehicle 54 adjoin the endwall 45 of the transport tank 44.

Claims (17)

1. A self-supporting transport tank for reception of powders or fluids, comprising at least three mounting points, which is assembled in mechanically secured and hermetic manner from substantially plate-like endwalls, a floor, a roof and contoured sidewalls, in which at least the sidewalls comprise several sections spaced apart from each other in a direction between the endwalls and recessed towards a central longitudinal axis of the transport tank.

2. A transport tank according to claim 1, in which the recessed sections of the transport tank are formed by part cylindrical recesses having upright axes and a cross-section transversely thereof in the shape of a circular segment having an arc height less than a radius thereof.

3. A transport tank according to claim 2, in which the central longitudinal axes of the recesses extend approximately at right angles to the floor of the transport tank and throughout the height of the sidewalls.

4. A transport tank according to claim 2, in which several recesses are arranged one behind another in the direction of the central longitudinal axis of the transport tank, notional intersections of curved surfaces of adjacent recesses being situated outside the transport tank at a distance from the si- dewalls.

5. A transport tank according to claim 1, in which reinforcing elements are situated between adjacent recesses, at least in the sidewalls of the tank.

6. A transport tank according to claim 5, in which reinforcing elements are situated at least in terminal sections of the sidewalls and the adjacent endwalls and these reinforcing elements accommodate coupling elements of external coupling devices.

7. A transport tank according to one of the claims 1-6, in which the endwalls, sidewalls, the roof and floor elements are produced from glassfibre-reinforced plastics material, and that carrying frame members which have at least three areally distributed bearing points for fastening elements are incorporated in the floor element.

8. A transport tank according to claim 7, in which the bearing points are formed by metal elements comprising heavy-gauge metal plates or the like and which are installed facing an outer covering layer.

9. A transport tank according to claim 1 mounted on a service vehicle in which a section of each sidewall is recessed towards the central axis of the vehicle by a distance which corresponds approximately to a depth of equipment modules situated in the region of the sides of the vehicle, a spacing between the sections of the opposed sidewalls being greater than a clearance between two longitudinal stringers of a chassis frame.

10. A transport tank according to claim 8, in which in a basal section of the transport tank, the recessed sections of the sidewalls have further sections recessed towards the centre of the vehicle beyond these sections, a spacing between these further sections at right angles to the sidewalls being smaller than a clearance between two stringers of the chassis frame and between which the further recessed basal section extends.

11. A transport tank according to one of the claims 1,9 or 10, in which reinforcing angles extend parallel to the sidewalls and have respective flanges aligned parallel to the base of the transport tank and parallel to sides of the recessed sections is situated in edge sections connecting the two recessed sections of the sidewalls to the floor.

12. A transport tank according to one of the claims 1 or 9 to 11, in which planar wall sections of the sidewalls and/or end walls and of the recessed sections are constructed as sandwich elements and comprise panel-like support elements between two covering layers of glass-fibre-reinforced plastics material.

13. A transport tank according to one of the claims 1 or 9 to 12, in which wall sections reinforced by support elements are joined together by means of reinforcing inserts, by means of highstrength strips or mats situated in the glass-fibrereinforced plastics material.

14. A transport tank as claimed in claim 13, in which the reinforcing elements comprise carbon fibres.

15. A transport tank according to one of the claims 1 or 9 to 14 on a service vehicle, in which the sidewalls have a spacing therebetween which corresponds approximately to a distance between opposite sides of the service vehicle and the recessed sections accommodate equipment modules in the region of the vehicle sides.

16. A transport tank substantially as described with reference to the accompanying partly diagrammatic drawings.

17. A service vehicle incorporating a transport tank and substantially as described with reference to the accompanying drawings.