CN87103389A

CN87103389A - Pressure tank construction for corrosive medium

Info

Publication number: CN87103389A
Application number: CN198787103389A
Authority: CN
Inventors: 唐纳德·F·费尔格里夫
Original assignee: Airclean Engineering Products
Current assignee: Airclean Engineering Products
Priority date: 1986-05-09
Filing date: 1987-05-05
Publication date: 1987-12-30
Also published as: CA1261770A; EP0244946A3; AU7098287A; EP0244946A2; JPS6322389A

Abstract

The steel hot-water cylinder has anticorrosive coat on internal surface, there is recessed internal surface at two ends.Jockey is connected the pre-coated end with pre-coated tank inner surface, the unlikely coating that makes of sweating heat is degraded.The comparable existing person of this structure increases the volume of jar, and material thickness comparable sidewall in end is for thin, and the method for proposition can not make pre-application layer degrade when weld assembly.

Description

Pressure tank construction for corrosive medium

The present invention relates to have on its internal surface the improved hot water cylinder of steel of anticorrosion coating.

Typical pottery or glass lining hot-water cylinder have a columnar sidewall and a columniform top, and the inner surface of concave is arranged at the top, form " just " head of tank.The inner surface that a protrusion is arranged at the bottom of the tank, " bearing " end of formation tank.Existing quite for many years with this structure system jar, this technological method generally with welded top to cylinder side wall with the flat blank rolling of rectangle, in the uncovered jar in bottom, add coating.The pre cap bottom of convexity inner surface will be arranged then, be welded on the bottom of tank.

Although this structure, finds in industry that it is a problem that can body breaks applicable to hot-water cylinder, generally is because the hot water of tank deck increases the corrosion of tank deck and sidewall seam crossing.This breakage generally is because in overwrite procedure, the deposited glaze of executing or coating are interrupted and are caused.Another shortcoming of this structure is " bearing " bottom material thickness of tank, require big more quite a lot of than sidewall, guaranteeing at the bottom of the tank under the pressure, at least therein heart district can because of crooked may make to cover the crack do not occur or coming off of certain form occur." bear " another shortcoming of header structure, it is quite a lot of to be that tank volume after the assembling reduces, thereby must increase the total height of hot-water cylinder.The hot water of tank deck increases any corrosion reaction because the gas that discharges contains oxygen, can with add glaze or cover bad bare metal chemically reactive, to corrosion.Should also be understood that temperature whenever increases+spends chemical reaction and accelerates one times.In addition, it is not necessarily very perfect near character that tank deck and tank skin cooperate, because the periphery of the cylindrical shape of tank side part and tank deck has empty crack or other defect.Therefore, though very careful when adding glaze, and the joint between tank deck and sidewall probably still has some unlapped zone.

For increasing the volume of tank, advantageously not only at hot-water cylinder dress " just " head, but also to fill " bearing " bottom.This can increase the volume of tank concerning given diameter, and may reduce according to the shape of " just " head the height of tank.Yet, there is not in the prior art known method, can weld " just " end of tank and the tank that has welded " just " top and covered ceramic material.If jar a pre cap " just " bottom, by the mode and the sidewall welding on weldering top, coating will seriously degrade or damage because of welding heat so.This cover part and, sky that degrades and to cause steel by hot-water corrosion.

About in the prior art field to the tank method processed of circle tube tank structure dress " just " top and bottom, United States Patent (USP) 3,199 discloses a kind of fire suppression bottle in No. 711, the pressurization material can be put in the inside.Because tank material processed can not contained the thing corrosion, so do not add protection cover layer or anticorrosion coating in the tank.For example, when holding fire-extinguisher fluid, jar welds with fine material with copper or similar material manufacturing, each assembly.No. the 3rd, 952,904, similar approach such as U. S. Patent propose, its manufactured materials is not contained the personage yet and is corroded.The plastic bottom of inner concave shape is soldered to ultrasonic welding on the plastic sidewalls of shielding, and the shielded joint place is provided with the Sealing anti-leak.This method does not require the protection cover layer, and the sweating heat of junction may affect interior protection cover layer, and this joint does not need any welding.

Other types are adorned the container of " just " end on the circle tube tank sidewall, as U. S. Patent the 3rd, 098, No. 577 and 3,132, No. 618 disclose.Two patents all do not have to consider at the tank inner surface, add and suppress to contain the cover layer that thing causes corrosion.Above about the discussion of the hot-water cylinder in prior art field, disclosed jar structure is all unresolved in this two patent.

According to an aspect of the present invention, hold the jar of aggressive medium, an anticorrosion room that covers is arranged on its internal surface.Tank has a cylindrical shape steel sidewall and fixes first and second end that cover is tight at tank.At least first end has recessed shape, gives prominence to outer in tank.At least first end is fixing with a connection set and jar, and connection set has an annular body, and the control welding heat is to the influence of anticorrosion coating, and this coating is added on the internal surface of pot sidewall internal surface and first end in advance.The first of annular body, be connected with first end joint around connect.The second portion of annular body is connected with one second joint of sidewall cylindrical ends.One of in first and second parts and corresponding first or second joint be coated with anticorrosive coat.Another part in first and the second portion is as welding point.Annular body is separated by weld seam and anticorrosion covering by predetermined amplitude, just the heating temperature of may command coating.

According to another aspect of the present invention, a kind of method that the steel end is connected with the respective end that holds the aggressive medium cylinder of steel has been proposed.Tank has the cylindrical side wall with inner surface, and the end is circular, and its concave shape to outer outstanding, have jockey that the end is connected in the end with pot sidewall and connects in the tank.This method comprise with jockey with is connected an end or pot sidewall and connects.On the tank inner surface, add anticorrosion coating on the inner concave of end and on the exposed part of jockey.Connection set and end or pot sidewall welding.When finishing being connected of end and pot sidewall, with the exposed part of the cladding of connection set, the coating on the internal surface of end, or the coating on the pot sidewall internal surface form the interface of coating.The temperature controlling that the coating interface is heated is separated by connection set weld seam and coating interface by connection set and is carried out by predetermined width.

Optimum implementation of the present invention as shown in the figure, description of drawings is as follows:

Fig. 1 is the hot-water cylinder perspective view that the prior art equipment characteristic is arranged;

Fig. 2 is shown in Figure 1 jar the bottom and the sectional view of tip portion;

Fig. 3 is the sectional view at the bottom of the hot-water cylinder; According to one embodiment of the invention, adopted will " just " end and jar connecting means,

The present invention various embodiments of Fig. 4 to 9 for hot-water cylinder " just " end and pot sidewall are connected;

Figure 10 is the cutaway view of hot-water cylinder bottom, is illustrated as the another kind of supporting structure of " just " end hot-water cylinder.

The present invention is applied to hold the jar structure to the various ways of the mordant medium of system tank material; For example, the cylinder of steel that is filled with water, sour gas bottle, fire extinguisher and barrel of beer etc.Now to optimum implementation of the present invention hot water cylinder of steel explanation.But be appreciated that this embodiment can be applicable to other jar structure equally.

The hot-water cylinder that is used for resident family and commercial undertaking, heating and storage of water, general temperature range is 120 °F to 160 °F, thermal source is generally with heating or gas heater.The typical tank that electric water heater is used is shown in Fig. 1 and 2.Jar 10 has a cylinder side wall 12, and the band first end is that bottom 14 and the second end are top 16.Tank both ends and cylinder side wall welding with the tank sealing, form heating and store hot water and chamber.Be appreciated that water intake and electric heating element hole are located on the sidewall 12, and not shown in the figures.Usually fetched water from the water heater top by delivery port 18.

The assembling of the water heater in the prior art field generally is that end 16 is welded on the sidewall 12.Referring to Fig. 2, the end periphery 20 on top 16 is inserted in the sidewall upper portion 22.22 welding of top 16 usefulness fillet welds 24 and side wall ends are connected the outer side wall 28 of top edge 26 and tip portion 16.So just, made a jar that the lower end is uncovered, end 16 has been housed on the jar, inside has added anticorrosion coating.During cladding, can use abrasive material or acid etching method, remove oxide and the dust and dirt of cylinder of steel inner surface, cleaning tank and inner end portion, simultaneously effects on surface etch forms the good combination of anticorrosion coating and tank inner surface.After the cleaning, glaze slip commonly used in the coating prior art field in tank, glaze slip is made up of the porphyrize ceramic powders that is suspended in water.Glaze slip is coated on whole internal surfaces, comprises the concave surface 30 of end 16, the connection area 32 in jar and the internal surface 34 of pot sidewall.For ease of the welding of bottom 14 and pot sidewall, with on the feather edge 36 and the coating on the inner edge portion of pot sidewall erase.The tank that will be coated with glaze then passes through in drier, removes the moisture in the glaze slip, puts into the roasting glaze stove of generally working about 1600 °F.The result forms a jar interior smooth anticorrosive coat.

The inner surface of the protrusion of bottom 14 is by the method identical with the ladle bowl assembly, with its cleaning and glazing.Erase 38 li the glaze floor in district, thereby can be close to the end 36 of the cleaning of sidewall.The end 14, inserted in the tank.Coating at the bottom of the tank on the inner surface 40 coating on the side wall inner surfaces 34 that reclines.Connect

surface

36 and 38 with weld seam 42.Usually weld seam 42 from zone that label 44 indicates quite away from, this zone is the junction of

inner face

34 and 40, so the heat that welding process produces can not make coating degrade.This welding generally connects row with a kind of submerged arc welding method.

This adding at tank deck, add using many years of " bearing " head at the bottom of " just " head and the tank.When certain total height, it is quite a lot of that " bearing " head reduces tank volume.Manufacturing has the material of the bottom of protruding inner surface, must be thicker than sidewall, could resist the pressure in the hot-water cylinder.As using thinner material, then the bottom may be rugosity, cause the crack of coating and the relief area of corrosion, and even tank damages.If the bottom is dish-shaped similar with " just " head, then the thickness of base material is generally approximately big 1.6 times than the thickness of " just " head, and the material of " just " head is usually than side thickness.This causes sizable problem getting the raw materials ready, and needs to be equipped with according to the parts of making the material of three kinds of thickness.Increased again the extra demand to processing unit (plant) and machine tool during manufacture component.

For increasing tankage size on this diameter, and allow to use thin material thickness at least at the bottom of the jar, holding with " just " at the bottom of the jar is a desirable embodiment of the present invention.Yet after pot sidewall and tank deck assembling and coating, " just " end of jar subsequently and the welding of pot sidewall certainly will be carried out in the cated zone of pot bottom.Welding seam heat directly by the conduction of tank diapire, degrades ceramic coating.If use non-ceramic coating, for example when containing various suitable polyamide polymer coated, problem will be more serious; Polyamide such as nylon II (trade (brand) name) etc.This destruction and the attenuating that degrades and to cause anti-corrosive properties of coating.

Preamble is mentioned, and also has the several damage that another problem is tank in the existing jar structure, is owing to the coating damage in the upper seaming zone between tank deck and the sidewall causes.Therefore, the top structure of hot-water cylinder requires to avoid the damage of coating.

According to the present invention, establish joint at arbitrary end of the cylinder side wall of jar, during use, the top or the end that can form jar.As shown in Figure 3, on the bottom 36 of circle tube tank sidewall 12, " just " bottom 46 is installed.The concave inner surface 48 of end 46 protrudes outside tank.According to the present embodiment, concave inner surface 48 is semiellipsoid shapes.Yet be appreciated that also can there be torispherical the end, as ASME " boiler and pressure vessel standard " chapter 8 part I, (version in 1977) defined.Owing to basic material thickness is uniformly arranged, so the outer surface 52 of end 46 has roughly the same shape.For forming the connection in end 46 and the sidewall 12, adopted a jockey with label 54 general references, an annular body is arranged above it.According to an aspect of the present invention, the peripheral part 56 of connection set 54 and 46 outsides, end is fixing.This connection can be adopted welding or other suitable fixing device.

Before with

end

46 and 12 assemblings of jar cylinder side wall, the internal surface 48 in jar internal surface 34 ends, and the outside of connection set 54 adds coating.With subsequently with the zone 57 of tank skin welding in unnecessary coating erase.Also erasing on tank the inner makes relative surface not have coating so that welding.The end 36 of then cylinder side wall being inserted in end 46, the coating on the table 34 overlaps mutually in the coating on the jockey 54 and the tank here, and the tank end is sealed.With fillet weld 58 connection set and end 36 are welded then.The configuration of jockey 54 should be controlled coating lap joint being heated with jockey and end 36 welding the time.The control of this temperature, by jockey 54 with angle welding 58 and overlap joint coating joint preset width separately, and and end and pot sidewall inner surface on the predetermined space width of coating realize.Jockey 54 conducts the weld zone of heat from weld seam 58 to the junction of coating.By repetition test, just can make jockey with the width at weld seam and coating joint interval, the heating temperature of control coating.Perhaps require temperature is controlled in the scope, make sweating heat be minimum to the impact of coating joint, or can avoid impact fully.In other method, may require temperature is controlled in the scope, in welding process, to the junction fusion of major general's coating.Be appreciated that when requiring to increase the coating connector temperature, highly littler jockey is set, or reduce the quality of jockey, or use to the connector area faster material manufacturing of conducting heat.About the overlap joint of coating joint and being described in detail of formation and solder technology, will discuss with regard to each embodiment of the present invention shown in Fig. 4 to 9 hereinafter.

For finishing the assembling of hot-water cylinder bottom, a columnar base 60 can be set.Base 60 has an inside step portion 62, is fixed on the internal surface 64 of connection set.Base has a bottom peripheral edge 66, extend in end 46 lowermost portion 68 below, when hot-water cylinder erect to use, play the leg effect of hot-water cylinder.

The coating of the connection set 54 of end 46 and the internal surface 34 of pot sidewall 12, comparatively detailed showing in Fig. 4.Connection set 54 has a ring-shaped skirt, and the outer surface 56 of its outer surface 76 and end welds at 74 places.Skirt is overhanging from the end, in zone 84 ladder is arranged, and is convenient to end 46 is inserted in the tank.Being added in the coating 70 on the internal surface 34, can be a kind of burning ceramics component or certain polymerization composition, such as " nylon ".Discuss as mentioned, when pottery or glass lining cover layer are set, with a kind of liquid slurry that contains ceramic particle, be coated on the inner surface 34 of pot sidewall.72 following circumferential ends does not have cladding material in the shell, and therefore after pot sidewall is dry and calcining, no coating is gone up in this zone.End 46 and connection set 54 on whole internal surfaces 48 of end, also scribble ceramic liquid paste paint, and lap weld district 74, and the weld zone comprises the attachment portion of connection set 54 and end outer edge part 56.Connection set outer surface 76 also scribbles the slurry material, thereby forms the basic coating 78 that links up.Bottom 80 does not apply, and forms the no coating periphery district 80 around jockey 54 peripheries.

To be coated on then coating glazing, slaking or fusion on pot sidewall inner surface and the end 46.Then the end is inserted a jar end,, contact in the zone of the label on the connection set outer surface 76 82 and the zone of the label 82 on pot sidewall coating 70 bottoms until cated surperficial 70 and 78.This contact of coating forms the sealing around tank bottom periphery, prevents from leaking, thereby effectively forms the coherent coating from sidewall to end 46.The parallel coating surface that forms the coating joint is set, just forms a quite wide circumference area of the contact area that connects coating.This contact zone can guarantee the sealing of coating joint periphery, because bandwidth can be set up the contact between the coating.As discussed above, if the difficulty that is sealed with of coating joint periphery is set, can control by jockey the heating temperature of coating joint, coating is fused in this zone, and do not make coating because degrading fully, lose the potentiality that seal at this joint.When coating is polymeric material, as be " nylon " etc., be heated to the proper temperature fusible, this method particularly suitable.Be appreciated that before welding, can add a kind of sealant in the joint, such as epoxy coating, or sheet packing etc.So welding heat is subjected to the control of connection set, guarantee that epoxy encapsulant does not degrade.

The end is fixed in place at pot sidewall 12 now.Jockey 54, therefore when the no coating layer portion 72 with no coating layer portion 80 and pot sidewall welds, at least unlikely at connector area and inboard sweating heat thereof from coating joint 82 overhanging enough distances, antiseptic property is descended.This jockey 54 and on the inner surface of end 46, can play the effect with welding zone and coating isolation not only on jockey 54, therefore weld complete after, keep the coating that links up in basal surface and pot sidewall district.Connect the welding job of jockey 54 and end outer peripheral edge portion 56, carried out in the past adding coating to end and jockey, therefore the sweating heat in this welding is to the not impact of later coating process.In fact, coating covering joints district and presumable any weld seam apply this zone and protection, prevent the corrosion that it is subjected to carrying liquid, and this liquid is generally water.

Be appreciated that and realize principle of the present invention, the various structures that can adopt the end to be connected with pot sidewall.With reference to Fig. 5 to 9, be depicted as the structure of various conversion, should be understood that and expose the surface of containing liquid, answer coating anti-rot material.

As shown in Figure 5, end 46 have one recessed surperficial 86, can be oval shape, torispherical or semi-spherical shape, the same with situation shown in Figure 3.Jockey 54 have ring-shaped skirt 88 in the tank to overhanging.According to the present embodiment, skirt section 88 is continuities of end wall 90 parts, is a reverse 92.46 usefulness thickness basic steel manufacturing uniformly in end is inserted with pre-application layer the pot sidewall 12 of coating inner surface 34.The purpose that applies is to form a joint in district 94, and effective formation centers on the sealing at the bottom of the tank.In the

zone

72 and 96 of pot sidewall outer skirt, no coating layer portion is set, thereby can adopts angle welding 98, connection is connected in end 46 with pot sidewall.The skirt section of connection set 54, a protruding suitable distance in the jar makes the zone at fillet weld 98 places, and the anticorrosion character of coating can soldered heat drop matter, can not degrade in the connector area 94 around the connection set 54 at least.End 46 is arranged reverse 92, and the monolithic blank of the just available thin plate steel in whole end is made, and does not need weld job in inflection district 92.

Referring to Fig. 6, be shown with another embodiment of the hot-water cylinder end 46 that is installed on the pot sidewall 12.During with this builtup member, tip portion can be identical with the bottom diameter.This method keeps its two ends to separate when making tank, can greatly reduce the expense of getting the raw materials ready.There is recessed internal surface 100 end 46.Connection set 54 has skirt section 102, and the upper end tilts to 46 bottoms 104, end.Be connected with end 46 with the rake 108 of fillet weld 106 skirt section.The assembly parts of connection set 54 and end 46, application method is similar with the used application method of other embodiments.Side wall inner surfaces 34 applies, thereby when inserting end 46 in the pot sidewall, the contact of two coatings forms sealing in connector area 110.After the end assembled in tank, the no coating layer portion that tank end 72 is connected with the jockey skirt section connected with angle welding 114, and sweating heat is the coating of influence area 110 not.

The embodiment of Fig. 7 is the conversion of Fig. 6, has proposed a kind of structure, end 46 easy to use, and this end 46 is identical with other end that is connected on the pot sidewall top with technological method shown in Figure 2.For adapting to the thickness of jockey 54, sidewall 12 has ladder in district 116.According to the present embodiment, connection set 54 is skirt sections 118, welds with the peripheral part 122 of end 46 at 120 places.End 46 and connection set 54, when application tip 46, coating covers the seaming zone that comprises weld seam 120.After the tank end is inserted in end 46, fixing with weld seam 124.Suitable distance is stretched out in skirt section 118 outside tank, make weldering 124 positions and zone 126 that enough distances be arranged.Coating and the coating on the jockey 118 in the tank on the table 34 contact with each other in this zone 126.The welding heat of weld seam 124 can not make this zone or its inner coating degrade, and comprises that also the coating on 46 inside 128, end does not degrade.

Another kind of structure has been shown among Fig. 8, end 46 can have been connected with pot sidewall.Connection set 54 has a skirt section 130, in periphery 134 welding of seam 132 places and end 46.Then that the soldering group component is inwardly curved, degree of crook forms as shown in Figure 8 to 12 li introducing parts of inserting end 46 of pot sidewall.Pot sidewall 12 adds coating 70 by the method above with reference to Fig. 4 discussion, and jar end 46 band connection sets 54 are added coating 136, the topped seaming zone 132 of coating, and the outer wall section 138 that prolongs skirt section 130 stretches downwards.The no coating layer portion of skirt section 130 outer surfaces 138, and between the corresponding no coating layer portion 72 of pot sidewall, the cooperation that has tolerance to be rather narrow.Weld seam 140 positions and be coated with room joint 141 suitable distance is arranged do not make coating degrade.Equally, skirt section 130 isolates the coating on end 46 inside of weld seam 140.

" just " end at top of also pot sidewall can being connected with the bottom connects, and the internal diameter of the circumferential section on the end or top is greater than the external diameter of ladle bowl.This connection as shown in Figure 9, wherein, pot sidewall 12 has connection set 54, and is fixing in the outside 144 of first portion 142 places and pot sidewall.The internal surface 34 of jar comprises on all the other outer surfaces of connection area 146 and connection set 54, is coated with to add corrosion-inhibiting coating " just " end, and may be bottom 46, on its internal surface 48 coating is arranged, the coating on 150 surfaces 148, overlap joint connection set zone.The second portion 152 of jockey in 154 places and end 46 welding, is finished the assembling of end and pot sidewall with fillet welding.Connection set 54 keeps suitable span with fillet weld 154 and overlap 150, the temperature that control weld job floating coat overlap is heated and reaches.Utilize this technological method, bigger end and less ladle bowl can be assembled.

The another kind of load module of hot-water cylinder base as shown in figure 10.End 46 is by structure shown in Figure 8 and pot sidewall 12 assemblings.Use the hot-water cylinder such as foamed material thermal insulation such as urine gastral cavity foams, a prefabricated foam base 156 is housed, the latter adapts to the shape of end 46.When being placed on the foam base 156 at the bottom of with tank, can between tank outside 158 and the pot sidewall 12, also comprise the (not shown) part around the top with a shell component 158 around base and tank assembling, cavity 160 is arranged.After assembling finishes, foamed material is put into cavity 160, with heat-insulating foam filling cavity, in case the setting of foam urine gastral cavity component just makes reinforcing structure.So just, proposed the rapid assembly technique of hot-water cylinder structure, shell 158 structures of its band dull and stereotyped 162 are promptly finished, and available, its flat board has the leg of stretching out part 164.

Discussion was carried out according to Fig. 2 in the front, and the process of assembling top and tank end can cause damage in the prior art.If tank has " a bearing " end,, use " just " top and tank end instead and assemble, just can avoid this damage with regard to Fig. 3 to 10 process that discuss, assembling jar " just " bottom with above.Be appreciated that prolongation skirt section or other analog 60 shown in Figure 3 are unwanted when connecting top and tank.If tank foam insulation, the top of tank can be the minute surface videos of Figure 10, as be provided with suitable perforate and plumbing and do the hot-water cylinder outlet, just can be without leg and so on.

Use this assemble method, sweating heat during with tank end and pot sidewall welding is isolated, the tank coating is not degraded, just can obtain at the two ends of tank " just " head structure, increase the volume of tank, and can be at the tank end with the littler material of thickness, unyielding because the concave shape of tank end can bear much larger stress.The end material thickness reduces a lot, makes it to equal 13 to the thickness less than sidewall, on tank processed very big saving can be arranged.For example, in jar structure, the bottom time spent can be done in the top, and with method shown in Figure 7, material saves 8% approximately.In the tank end structure, there is the ellipsoid configuration of approximate diagram 3 end, or similarly (use of several places " similar " is herein all crossed greater than merit-translator) torispherical is arranged, and material can save about 20%.During the nearly hemispherical of tank termination, material saves about 31%.This is because when the near hemispherical of tank termination, the little a lot of material of tank end available thickness, and still can bear the pressure of tank.

Jar is held the ratio of material thickness and pot sidewall thickness and is born jar relation of internal pressure stress, existing more understanding in the pressurized tank design.After known tank end design can be born predetermined pressure, just can use thinner material tank end processed, in order in tank processed, reduce quite a large amount of materials.In the structure in prior art field shown in Figure 2, amazing is that even tank deck adopts " just " head structure, the tank deck material thickness is generally 1.6 times of pot sidewall thickness, as for the bottom " bear " head thickness, average thickness is that sidewall thickness is more than 1.9 times.According to the present invention, the tank deck and the end, it is found that two-end thickness all can be less than the thickness of pot sidewall when all using " just " head structure.This just just can save considerable material, until 28%, in the connector area of tank deck and sidewall, the damaged condition of tank reduces a lot.And the energy that design can make glazing use has very big saving, and according to the difference of tank end shape, saving can reach 10 to 30%.The another kind of form of energy conservation, the total surface area that can reduce because of the water of a constant volume tank realizes.Because the tank surface area reduces, thermal losses reduces, and keeps requiring the needed energy of water temperature also to reduce.

According to the present invention, by an important advantage of above-mentioned method enforcement embodiment of the present invention, be that sidewall can apply respectively with the end.Therefore, before with end and pot sidewall welding, can check the scar in the sidewall.And the screw thread of outlet 18 can be checked respectively.This point is even more important when being coated with ceramic liquid slurry coating in tank.In addition, when tank end coated with ceramic liquid was starched, its validity can check, especially at the seaming zone of jockey.

Claims

1, hold the pressure cylinder of steel of aggressive medium, on this jar internal surface, anticorrosion coating is arranged, this jar has a cylindrical shape steel sidewall, there are first and second end and this jar fixing, it is closed, at least this first end has concave shape, outstanding outside jar, this first end that is characterized as of the present invention is fixed with a connection set and this jar, connection set has an annular body, the control welding heat is to being coated in the effect of this anticorrosion coating on this pot sidewall internal surface and this first end internal surface in advance, the first portion of this annular body is connected with the periphery of this first end, forms first joint, and the cylindrical ends of this annular body second portion and this sidewall is connected, form second joint, part in first and second part and corresponding first or second joint are coated with this anticorrosive coat, and the another part in this first and second part forms welded joint, this annular body is separated by this welded joint and this corrosion-inhibiting coating by predetermined width, with being heated of control coating.

2, such as the tank in the claim 1, it is characterized by on this second joint coating is arranged, this second portion of this annular body connects with the outer surface of this sidewall cylindrical ends, this first of this annular body, rounded internal surface welding with this first end, this annular body adds this coating, and its periphery touch this coating on this first end inner surface.

3, such as the tank in claim 1 or 2, it is characterized by this annular body when this first joint of welding, control the fusion temperature that this is affixed coating.

4, as claim 1, jar in 2 or 3, it is characterized by this annular body from this first end to overhanging, and add and on this this internal surface of first end, add attached coating, this annular body is inserted in the cylindrical ends of this sidewall slidably, this coating on this side wall inner surfaces, this coating circumference on this annular body that reclines, form the sealing of this sidewall internal coated layer and this annular body coating joint, near this side wall inner surfaces and this annular body, outwards be provided with coating from this coating joint, a weld seam should no coating sidewall and annular body welding.

5, as the jar in the claim 4, it is characterized by this second end and be recessed shape, outside the jar introversion, give prominence to and this sidewall welding, form the periphery spigot of this second end and this sidewall second end wall, this coating covers this spigot.

6, as the jar in the claim 4, it is characterized by this annular body and this first end is in aggregates, to reverse extension, form inflection around its periphery from this end by this first end, this inflection constitutes this first joint.

7, such as the tank of aforementioned claim in any one, it is characterized by this first end is an ellipsoid along the cross sectional shape of diameter, accurate spheroid or semicircular body.

8, the jar of claim in any one as described above, it is characterized by this first end has basic homogeneous thickness, is less than or equal to the basic homogeneous thickness of this sidewall.

9, a kind of with a steel end with hold the method that aggressive medium cylinder of steel respective end is connected, this jar has the sidewall of a cylindrical shape band internal surface, this end is circular, the concave shape that evagination in the jar is arranged, there is connection set that this end is connected with this pot sidewall end, arbitrary this end that is characterized as connection set and this pot sidewall of this method is connected, at this internal surface of this jar, this end is recessed into internal surface, with cover anticorrosive coat on this connection set exposed part, with connection set and this end or the welding of this pot sidewall, finish being connected of this end and this pot sidewall, exposed part after this of this connection set covers, coating on this end internal surface or this pot sidewall internal surface reclines, form the coating joint, predetermined this connection set is with this connection set weld seam and this coating joint width at interval, to control the heating temperature of this coating joint.