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7 32in brass tube

author:MF manufacturerstime:2022-03-09 11:27:07

Pipeline equipment used in petrochemical devices,Generally include a pipe、Fitting fitting、valve、Flange、Gaskets and fasteners and other pipe components,For example, filter、Splitter、Firer、Compensator, etc.。

Introduce a variety of common materials, respectively。

one、tube


7 32in brass tube


Many tubes classification methods,Classification according to material can be divided into metal tubes、Non-metal tube and steel lining non-metallic composite tube。Non-metal pipe mainly has a rubber tube、plastic pipe、Asbestos cement tube、Graphite tube、Glass steel pipe, etc.,Non-metal tubes are smaller than the proportion of metal tubes,Metal tube accounted for more than 85% of all process pipe installation projects in most petrochemical devices,This section focuses on metal pipes。

Classification of metal pipes,See the table below


7 32in brass tube


(one) Welded steel pipe

(7 32in brass tube)Welded steel pipe,Stylit steel tube is also known,Generally, it is generally welded by a steel plate or steel strip.。According to the surface treatment of the pipe, it is divided into galvanized and non-galvanized.。Surface galvanized white,Alike called a white iron or galvanized steel pipe;Surface is not galvanized, ordinary welded steel pipe,Black iron pipe。Galvanized welded steel pipe,Commonly used for transport media requires more clean pipelines,Such as living water、Purifying air、Instrumental air, etc.;No zinc welded steel pipe,Can be used to deliver steam、gas、Compressed air and condensed water, etc.。

According to user requirements,Welding steel pipe can be divided into two,One is the tube end with threaded,The other is that the tube is not threaded。Welding steel pipe with threaded tube,Each tube length is4~9m,Welding steel pipe without thread,Each tube length is4~12m。

Welding steel pipe is different from the thickness of the wall,Thin-walled steel pipe、Thickened steel pipe and ordinary steel pipe。The most used in the process pipe is the ordinary steel pipe.,Its test pressure is2.0MPa。Thickened steel pipe test pressure is3.0MPa。

More coupled methods for welding steel pipes,Threaded join、Flanges and welding。The flange connection is divided into threaded flanges and welding flanges.,Welding method is also divided into gas welding and arc welding。

Commonly used welded steel pipe specification range is a nominal diameter6~150mm。

(two) Seamless steel pipe

(7 32in brass tube)Seamless steel pipe,Is the maximum amount of industrial pipeline,Variety of pipelines,Basically, two major categories of seamless steel pipes with fluid delivery and seamless steel pipes with specializens,The former is a steel pipe commonly used in craft pipelines,The latter is like a boiler special steel pipe、Cracking cooker and heat exchanger steel pipe, etc.。According to the material can be divided into carbon seamless steel pipe、Chrome-molybdenum seamless steel pipe and stainless、Acid-resistant steel pipe。Pressure according to nominality can be divided into low pressure(0≤1.0MPa)、Medium pressure(1.0<10MPa=、high pressure(≥10MPa)Three categories。Process pipelines are commonly used in fluid delivery seamless steel pipes。

(7 32in brass tube)1.Carbon seamless steel pipe,Commonly used manufacturing materials10No、20No、16Mnsteel,The specification range is:Hot rolling outer diameterφ32~630mm,Cold extra outer diameterφ6~200mm,Single tube length4~12m,Allowing operating temperature-40~450℃,Widely used to transport various types of steel non-corrosive,Severe steam、oxygen、Compressed air、Oil and oil, etc.。

2.Low alloy steel seamless steel pipe,Series alloy steel pipes containing a certain proportion of alloy elements。Usually divided into two kinds,One is a low alloy steel tube containing manganese elements,Ordinary low alloy steel pipe,Such as16Mn、15MnVWait;The other is to contain chromium、Low alloy steel pipe for elements such as molybdenum,Willa steel pipe。Commonly used12CrMo、15CrMo、12Cr2Mo、1Cr5MoWait,The specification range is outside the outer diameterφ10~φ273mm,Single tube length4~12m,The temperature range of chromium-molybdenum steel pipe is-40~550℃。Low alloy seamless steel pipe,Multi-use to transport various temperatures of oil、Salt water with strong oil and corrosive、Low concentration organic acid, etc.。

(7 32in brass tube)3.Stainless acid-resistant steel pipe,According to chrome、nickel、Different content of titanium various metals,A lot of varieties,haveCr13、00Cr17Ni14Mo2、1Cr18Ni12Mo2Ti、1Cr18Ni9TiWait。The most used in these steel numbers is1Cr18Ni9Ti,Simplified material documents in the construction drawing18-8To represent,Applicable temperature range-196~700℃,Media for transporting a variety of corrosive media in chemical production,Nitric acid、Acetic acid and urea, etc.。

(7 32in brass tube)4.High pressure seamless steel pipe,Its manufacturing material is basically the same as the seamless steel tube described above,Just tube wall ratio medium low pressure seamless steel tube thickness,Thirtiest tube wall40mm。Such as high pressure seamless steel pipe specifications for fertilizer equipmentφ14×4(mm)~273×40(mm),Single tube length4~12m,Applicable pressure range10~32MPa,Operating temperature-40~400℃。Transfer raw material gas in the petrochemical device seamless steel pipe、Hydrogen、Syngas、water vapor、High pressure condensed water。

Except for the above,There is also a low temperature steel pipe,More than the cold area of the introduction project,Its material grade isSTPL-39、STPL-46,Operating temperature-105℃,Suitable for conveying various non-corrosive low temperature medium pipes,At present, there is no mass production and steel pipe corresponding to this standard.。Low temperature steel tubes are divided into seamless steel pipes and slit steel pipes.,Seamless low temperature steel pipe nominal diameter15~400mm,Wall thick carbon steel pipe;Sewing low-temperature steel pipe nominal diameter400~1100mm,Wall thickness6~10mm,Single tube standard length6m。

(three) Steel roll tube

Steel roll tube,It is carried by the steel plate.,Two kinds of straight seam welding steel pipes and spiral welding steel pipes。

Most of the straight seam welding steel tube is manufactured in the construction site or commissioning processing plant,Professional steel pipe factory does not produce。Steel sheet materialQ235A、10No、20No、16Mn、20gWait,The specification range is a nominal diameter200~3000mm,Maximum4000mm,Wall thickness is generally4~16mm。Nominal diameter200~900mmSingle tube length6.4m;Nominal diameter1000~3000mmFor4.8m。Applicable working temperature:Q235Afor-15~300℃,10No、20No、16Mn、20gfor-40~450℃,All are suitable for low voltage range。

Spiral welding steel pipe,Production by steel pipe manufacturing plant,MaterialQ235A,16Mn。The specification range is a nominal diameter200~700mm,Wall thickness7~10mm,Single tube length8~18m。Applicable working temperature:Q235Afor-15~300℃,16Mnfor-40~450℃,Operating pressure:Q235Afor2.5MPa,16Mnfor4MPa。

Drew welding steel pipe and spiral welding steel pipe,Multi-purpose media that transports constant temperature and low pressure corrosion,Low pressure steam、Underground circulating water、Gas and oil, etc.。Spiral roll welding steel pipe single tube,Especially suitable for long distance delivery pipelines。

According to the required project,Stainless steel plate welding tube,All are on construction site,The manufacturer does not produce。The material used is mostly1Cr18Ni9TiSteel plate。The scope of its specification is nominal diameter200~1000mm,Nominal diameter200~400mmWall thickness4mm,Nominal diameter700~1000mmWall thickness6~8mm,Single tube length is4.5m。Applicable temperature and transport medium range with low pressure stainless steel pipe。

(7 32in brass tube)(Four) Copper tube

Brain tube is divided into piratulatures and brass tubes。Making the materials used by the purple copper tubeT2、T3、T4andTUPWait,High copper,Take up99.7%above;Brass manufacturing materialH62,H68Wait,Both zinc and copper alloy,Such asH62Brass,Its material ingredients copper60.5%~63.5%,Zinc39.6%,Other impurities are less than0.5%。

The manufacturing method of the copper tube is divided into two types of drawing and squeezing.。Pull the outer diameter of the copper pipeφ3~φ200mm,The outer diameter of the squeezed copper tube isφ32~φ280mm,Wall thickness1.5~5mm;Copper coil welding copper tube specification range is outside diameterφ155~φ505mm,The supplier has two kinds of single and set。

(7 32in brass tube)Applicable working temperature of the copper tube250℃the following,More used in oil pipelines、Insulation with pipes and spoof oxygen pipes。

(Fives) Titanium tube

Titanium tube is a new type of pipe in recent years.,Because it has a lightweight、high strength、Characteristics of corrosion resistance and low temperature resistance,Often used for other pipes that cannot be competent。Titanium tube is usedTA1、TA2Industrial pure titanium manufacturing,Applicable temperature range-140~250℃,Temperature exceeds250℃Time,Its mechanical properties have decreased。Commonly used titanium tube specification range is a nominal diameter20~400mm。Suitable for low medium pressure,Low pressure tube wall thickness2.8~12.7mm,Medium pressure tube wall thickness3.7~21.4mm。Although the titanium tube has many advantages,But due to expensive,Welding is more difficult,Not widely used。

two、Fitting fitting


7 32in brass tube


Change the direction in the pipeline、High or change the pipe diameter and the tubing of the branch or the like from the supervisor。Due to the shape of the tube、Unbard,therefore,More types of fittings。Commonly used tubular parts have elbows、Three-way、Absence、Tube joint、Capsule。

(7 32in brass tube)Pipes are classified by use


7 32in brass tube



 (one) elbow

The elbow is used to change the direction of the pipeline。The bending angle of common elbows is90°、45°and180°,180°Elbow is also calledUTitle,There are also special angles of elbows,But。

1.Ma Steel elbow

Ma Steel elbow,Also known as the wrought iron elbow,Is the most common thread elbow。This kind of martial steel pipe,Mainly used in heating,Upper and lower water pipes and gas pipelines。In the process,In addition to the need to be removed from the low voltage pipeline,Little use on other material pipes。Ma Steel elbow is relatively small,Common specifications range1/2~4inch,Different types of zinc galvanized and non-galvanized according to their different surfaces。

(7 32in brass tube)

Pressing elbow,Stamping elbow or seamless elbow,High quality carbon steel、Stainless acid-resistant steel and low-all-round steel seamless pipe, etc.,Pressing in a special mold。Its curved radius is one and a half of the nominal diameter(R=1.5DN),The curved radius can also be used for elbows of the nominal diameter.(R=1DN)。SizeDN20~600mmWithin。Its wall thickness range is consistent with the surface number of the seamless steel pipe。The pressing elbow is generally processed by a professional manufacturer or processing plant with standard seamless steel pipes.,End should be processed on both ends of the factory。

3.Stamping welding elbow

Stamping welding elbow,It is a plate with a plate to be stamped into a half-ring elbow.,Then group two semi-ring elbows to the welding form。Its curved radius,Specification range is a nominal diameter200mmabove。

4.Welding elbow

Welding elbow,Alike called shrimp or shrimp elbow。There are two kinds of production methods,One is the steel sheet of the processing plant,Cutting, wrapped molding,Mosting support for steel plate rolls。The other is the use of pipe.,Teacher welding,Its specifications are generally200mmabove。Using temperature cannot be greater than200℃,Generally can be made at the construction site。

5.High-pressure elbow

High-pressure elbow,It is used with high quality carbon steel or low alloy steel.。According to the form of pipeline connection,Processing of both ends of the elbow into threads or grooves,The precision is highly high,Require the splicing thread and flange threads to closely support free screwing and do not loosen,Suitable for pressure22.0、32.0MPaPetrochemical pipeline,Common specifications rangeDN6~200mm。

(two) Three-way

Three-way is the pipe fittings connected to the branch pipeline,Different from the manufacture of materials and uses,Divided into many kinds。Divided from specifications,Can be divided into three passs and absence of three links,Separation, three links, also known as isometric tee;The same-diameter tee is the same as the pipe diameter of the branch pipe and the tube of the supervisor.;The three passage of the three pass refers to the pipe diameter of the branch pipe is smaller than the pipe diameter of the supervisor.,So it is also called unequal three-way,There are more than three ways to use.。

(7 32in brass tube)

Machine and specifications of Ma Steel three-way,The same as Ma Steel elbow,Not much in the petrochemical process pipeline,Mainly used in indoor heating、Upper and down water and gas pipeline。

2.Steel three-way

20Century before the 1970s,my country's industrial production technology has slowed relatively slow,Process technology in process pipelines is also relatively backward。In the design of various medium and low pressure steel pipes,Pipes need to use three-way fittings,Generally, it is solved by using a way to dig.,That is, on the supervisor of the receiving tube,Direction first by the branch,Welding branch。There are many shortcomings in this way.,Welding quality is not easy to ensure,Welding, the pipe is easy to deform,The supervisor is easy to enter impurities。Seventy-decade,With metallurgy、Introduction of large modern production devices such as petrochemical,Promoting the development of process pipeline engineering technology,Currently,my country has been able to produce medium and low voltage pipe steel formulation three-way,Figured series products,Seamless three-way specificationDN20~600mm,Steel plate welding three-way specificationDN150~1500mm。

Conditioning three-way production,Is the material with high quality pipe,Undergoing materials、Excavate,After heating, use the mold to prepare,Machine processing,Become a set of finished products。Medium and low pressure steel finished products,Welding is adopted at the on-site installation。Three-way steel used by steel roll,Two cases,One is the steel sheet of the processing plant,Cavoing welding;The other is to mount the on-site excavation。

3.High-pressure three-way

High-pressure three-way,There are two commonly used,One is the welding high pressure three-way,One is the overall forging high pressure three-way。

Welding high pressure three-way,Use high quality high pressure steel pipe material,Manufacturing method is similar to excavation,The hole opened by the supervisor,To match the inner branch pipe diameter。Welding quality requirements are strict,Pre-warming is usually required,Heat treatment after welding。The specification range isDN16~200mm,pressure22MPa、32MPa。

(7 32in brass tube)Overall forging high pressure three-way,Generally, thread flange is connected。The specification range is a top numberSCH160、DN15~600mm,Table number plus“XXS”,Has rangeDN15~300mm。

(three) Absence

The role of the absence is to make the pipeline,From the direction of fluid movement,Most of them become larger,Some of them become large,Such as the exterior pipe of the steam backup pipe and the water pipeline is made up of small。Reaximinal。

1.Ma Steel

Ma Steel,Both of them,One is the internal thread weighing tube also known as an outer joint;The other is a tube member that combines internal threads and external threads.,Sub-core,Although it is not called a west,But the role of the weighing tube。

2.Steel weapon

Steel weapon,Divided into seamless and seamless,Seamless radiant tube pressing seamless steel pipe,Steel sheet for seamless,Washed welding,Also known as welding。These two types of weigns have two specifications of concentric and eccentricity.。There is a straight side at the bottom of the eccentricity,The bottom of the pipe can be used as a horizontal plane during use.,Easy to discharge the material during the discharge。

Seamless solar terms rangeDN25~600mm,The specification of the seamless welding line isDN200~1500mm。

Steel weapon,Finished pipe fittings as a pipe,It was only since the 1970s.,Early craft pipeline,Most of them are produced on-site。The variation of the pipe diameter is that the tube end pumping strip welding,Direct processing into a weapon;The pipe diameter changes are not directly fell directly to the tube end.。Summary welding production,Take more artificial,Welding,Welding quality is not easy to ensure,Currently,Craft pipelines with high welding quality have been prohibited from adopting such methods。

(Four) Other fittings

1.Ahead

Ahead,It is a plug for the control of the control。Commonly used tops have elliptical and flat cover。

Elliptical head is also called a cap,The specification range isDN25~600mm,Multi-use in medium and low voltage pipelines。Flat head,According to its installation location,One is a slightly larger than the outer diameter of the tube,External welding。The other is that the cover head is slightly smaller than the inner diameter,Put the head plate into the tube welding。Common specifications rangeDN15~200mm,This head is mostly used on a lower pressure of the pressure.。

2.Boss

Boss,Also known as a mouth,Is a self-control instrument specializing in the process of craft pipeline,Is installed by process pipelines,Therefore, the boss is also listed as a fitting member.。Single-sided tube joints used in process pipes also belong,It is one end soldering on the supervisor,Alternative or install other components,Or additional tube,The specification range isDN15~200mm,High school low voltage pipelines。

3.Blind board

Blind board,Its role is to cut the medium in the pipeline,According to the use of pressure and flange cover, the following is divided into the following:

(7 32in brass tube)(1) Slidender blind board,Use with smooth cover flange,Its applicable pressure range is1.0~2.5MPa。

(2) Convex blind board,Its own side of itself,Another side with concave surface,Use with the concave convex sealing surface flange。use pressure4.0MPa,SizeDN25~400mm。

(3) Ladder slot blind board,Working with ladder tank sheet flange,Use the pressure range6.4~16.0MPa。SizeDN25~300mm。

(4)“8”Literack,Also divided into a smooth surface,Three kinds of concave convex surfaces and trapezoidal grooves,Use pressure with the above three blind bilters,“8”The framing plate is different.,It combines two uses on a part,That is, the blind plate is connected to the gasket.。When packed in the flange,The gasket exposed outside is a visual sign that is cut off.。

(7 32in brass tube)“8”Various materials for the manufacturing materials of the character blind board,Select according to the temperature and pressure of the conveyor。General low voltage pipeline,Temperature does not exceed450℃Time,The material usedQ235A、20Steel and25Steel;Temperature450~550℃Time,The materials used are15CrMo、1Cr5Mo。Be in the pressure4.0~16.0MPa,Temperature is greater than550℃Time,Stainless steel。

(7 32in brass tube)three、Flange、Wasket and bolt

(7 32in brass tube) (one) Flange

(7 32in brass tube)The flange is a part of a connection role in a process pipeline.。This application range is very wide range of applications,Such as pipelines and process equipment,Connection of flange valves and accessories on pipelines。Flanges are used in both installation and disassembly flexibility,Reliable sealing。

Flange standardization,Domestic is not uniform。The earliest is1958Pipeline standard issued by the Year of the Year,It is a reference to the Soviet fifth decadency.;1959Annual Original Department issued a set of tube flange standards;20In the 1960s, with the rapid development of my country's petroleum industry,Original oil department1964A set of tube flange standards。These flanges have a total residence、Also there are specialty。Original one and the french standard of the chemical department,The inner diameter of the flat welding flange and the outer diameter of the welding method,Most of them are based on the small outer diameter of the pipe.;Most of the original petroleum flange standards is based on the outer diameter of the pipe.。Therefore, various standard flanges,Some local sizes are not the same。

Craft pipeline delivered,various kinds,Temperature and pressure,Therefore, the intensity and seal of the flange,Different requirements。In order to meet the needs of craft pipe installation projects,There are many flanges that have different structures and stress。The following is a brief introduction to various flanges.:

(7 32in brass tube)

Welding steel flange,Is the most commonly used in medium and low pressure processes。This flange is fixed in the form of a tube,Is the flange in the tube,Welding flangel port and outside,Flange fixed,Applicable nominal pressure does not exceed2.5MPa。Welding flange for carbon steel pipe connection,General useQ235Aand20Steel plate manufacturing;Welding flange on stainless acid-resistant steel pipe,Application of stainless acid-resistant steel plate manufacturing as tube material。Welding steel flange,Generally, it is smooth,Working on the sealing surface with shallow trench。Water wire,Figure。


7 32in brass tube


Welding steel flange

The specification of the flat welding steel flange is as follows:

Nominal pressurePN0.25、0.6MPaForDN10~2000mm;PN1.0~2.5MPaForDN10~600mm。

2.Welding ruland

Welding steel flange,Also known as high neck flanges or big tail。Its intensity is very difficult、Good sealing performance,There are a variety of forms of sealing surfaces,Applicable pressure range。

Smooth face,Its nominal pressure isPN2.5MPathe following,SizeDN10~2000mm,Nominal pressurePN2.5MPa,Specification rangeDN10~1000mm,Nominal pressurePN4.0MPa,Specification rangeDN10~600mm,Figure。

(7 32in brass tube)

7 32in brass tube

Smooth face


Concurred sealing surface,Since the concave convex sealing is strict,Affected pressure。Handling face,Must be a concave surface、The other is a convex surface。Commonly known nominal pressure rangePN1.6~4.0MPa,SizeDN10~600mm,Figure。HJ60mm

(7 32in brass tube)

7 32in brass tube


Concluded cover pair of welding steel flange

Sliding clay,This flange sealing performance is good,Structure form similar to uneven sealing surface flange,It is also a pair of flanges that must be used.。Nominal pressure range isPN1.6~4.0MPa,SizeDN10~600mm;PN6.4~10MPa,Specification rangeDN10~400mm,Figure。

(7 32in brass tube)

7 32in brass tube(7 32in brass tube)


(7 32in brass tube)Water trough facing soldering flange

Ladder trough pair of welding flange,This flange is often used in oil industrial pipelines,Have a large pressure,Commonly used nominal pressurePN6.4、10.0MPa,SizeDN10~400mm;PN16MPa,SizeDN10~300mm。


7 32in brass tube


(7 32in brass tube)Trapezoidal slot face for welding steel flange

All of the above,Just difference according to the form of its sealing surface。From the perspective of installation,Whether it is the form of welding ruland,Its connection method is the same,It is thus consumed,Materials and machinery,Basically, it is also consistent。But due to the different form of sealing surface,Flange's processing and manufacturing cost varicity,therefore,Inquiry(Previse)When you count, you should pay special attention to the price of the flange itself.。

3.Songbo steel pipe flange

This flange is not directly welded to the pipe.,Instead, the tube is turned over or the welding rings are sealed contact surfaces.,Subweight flanges,More used in copper、Colored metals and stainless acid-resistant steel pipes such as aluminum and lead。The biggest advantage is due to the free activities of the flange,Very convenient when the flange is bolted。Welding ring loose steel pipe flange suitable for pressurePN0.6~2.50MPa,The specification range isDN10~600mm;pressurePN4.0MPa,Specification rangeDN10~300mm,Welding ring loose steel tube flange only applies low pressure,PN0.6~1.6MPa,SizeDN10~600mm。The tube flank is only available forPN06MPaBelow。Welding ring loose set flange as shown。


7 32in brass tube


Welding ring loose steel pipe flange

(7 32in brass tube)

Thread flange,It is a flange connected with threaded flanges and tubes.,Two high pressure and low pressure。

Low pressure thread flange,Including two types of steel and cast iron,This flange,In the early days of the founding,Welding technology is very poor、Has been widely used。With the development of industrial、Low pressure thread flange has been replaced by the flat welding flange,In addition to special cases,Substantially。

High pressure thread flange,Widely used in modern industrial pipelines。Sealed by the tube end and the lens gasket,The precision processing requirements for the contact surface of the thread and tube end washer are very high.。This flange is characterized by the flange and the tube medium.,Easy installation is also more convenient。Suitable pressurePN22.0、PN32.0MPa,The specification range isDN6~250mm,Figure12-2-7。


7 32in brass tube


7 32in brass tube


7 32in brass tube


(7 32in brass tube)

High pressure pipeline flange connection structure type

5.Flange cover

Flange is a component used with flanges,It is the same as a closed effect as the head。Sealing surface has smooth and convex-concave,Its specifications and applicable pressure ranges are consistent with the matching flange。

(two) Flange gasket

Leakage is the main form of the failure of the tube flange,It with sealing structure、Stiffness of connected parts、Seal performance、Many factors such as operation and installation。The gasket is the main seal of the flange connection,Therefore, the proper use of the gasket is also the key to ensuring the flange connection.。The flange gasket is based on the corrosiveness of the medium delivered by the pipe.、temperature、There are many types in the form of pressure and flange cover.。Pipe flange gasket with non-metal gasket,Semi-metal gasket and metal gasket。

1.Rubber asbestos pad

Rubber cotton pad is the maximum amount of the flange connection、Can apply many media,Steam、gas、Air、brine、Acid and base, etc.。The thickness of the rubber stone cotton pad,Various major is not uniform,Usually used3mmthick。Nominal diameter is less than100mmFlange,The thickness of its gasket does not exceed2.5mm。

Pressure of the gasket,Used in smooth sealing surface flange,No more than2.5MPa。Two kinds of rubber asbestos are commonly used in refinery industries,One is the oil-resistant rubber cotton pad,Suitable for temperature200℃the following,Nominal pressure2.5MPathe following,Transmit general oil、Hydrocarbon、Propane and acetone。High temperature oil-resistant rubber cotton pad,Using temperature up to350~380℃。The other is a medium pressure rubber asbestos pad,Can be used200℃,PN2.5MPaThe following steam、Condensed water、water、Air and other media。

(7 32in brass tube)

Rubber mat,Washes made with rubber sheets,It has certain corrosion resistance,Commonly used for temperature60℃the following,Stress does not exceed1.0MPa,Transmit low pressure,Pipeline flange connection of acid and alkali,This feature of this gasket is the use of rubber elasticity.,Dacted better sealing effect,Therefore, it is also often used in the installation of cast iron flange valves.。

3.Wrapped gasket

Winding gasket is referred to as a winding pad,It is entangled with metal steel strips and non-metal fillers.。This gasket has a simple manufacturing、Low price、Material can be fully utilized、Advantages with better sealing performance,Wide application on petrochemical process pipelines。Applicable nominal pressure is4.0MPathe following,Applicable temperature range,08Steel temperature up to450℃,0Cr13Wrap pad made of steel belt,Using temperature up to540℃。Most of this gasket is used for smooth surface flanges,Its sealing surface does not use the car wire。Some winding pads,Also have a positioning ring,Is to prevent gaskets from deviation from the flange center。The thickness of the gasket is generally4.5mm,Diameter is greater than1000mmTime,The thickness of the gasket is6~7mm。The thickness of the positioning ring is3mmabout。Metal steel strip08Steel、0Cr13Steel and1Cr18Ni9TiSteel, etc.;Non-metallic strip quality、Flexible graphite、Polytetrafluoroethylene, etc.。

(7 32in brass tube)

The tooth pad is made of various metal,Material has ordinary carbon steel、Low alloy steel and stainless acid resistant steel,Its thickness3~5mm。It is in contact with the flanged sealing surface using the co-circular denseness of the concentric circle.、Multiple sealing,Therefore, the sealing performance is better,Commonly used in concave-convex sealing surface flanges。The highest nominal pressure is up to16.0MPa,Suitable for parts with high operating temperature,Such as0Cr13Material tooth pad,Its applicable temperature can be reached530℃。

5.Metal gasket

Many types of metal gaskets,Divided by shape with metal flat pad,Cross-crossing is elliptical、Octagonal metal gasket and lens gasket。Low carbon steel according to manufactured materials、Stainless acid-resistant、Copper、Aluminum and lead, etc.。

Metal flat pad,Multi-use for smooth surface welding method,Affielded temperature and pressure。

Elliptical and octagonal metal gasket,Multi-use for trapezoidal tanks,Nominal pressure range is6.4~22.0MPa。This gasket is good in sealing.,But manufacturing complex,High precision。

(7 32in brass tube)Lens mat,Named due to its cross-sectional shape,Good sealing performance、In petrochemical production,Flange connection of various high temperature and high pressure pipelines,Widely use this type of gasket,Commonly known nominal pressure range16.0~32.0MPa。

(7 32in brass tube)The use of metal gaskets,That is, the hardness of the washer surface must be lower than the hardness of the flange cover.。

The selection of the gasket should be based on the temperature of the medium delivered by the pipe.、pressure、Corrosive and connection flanged sealing forms to determine。Professional stronger gasket,Mirror mat,Suitable for high pressure flanges。

(three) Flange with bolts

Bolts used to connect flanges,Two kinds of single-head bolts and double bolts,Its thread is generally a triangular metric coarse thread。

1.Single-head bolt

Single head bolt also known as hexagon head bolts,Figure12-2-8Shown。Single-head bolts are divided into semi-intensive and refined,On the medium and low pressure process pipeline,Using the most used half-single bolts。

Manufacturing a single-headed bolt common materialQ235A、35Steel and25Cr2MoVAWait。Commonly used for nominal pressure2.5MPaThe following flange connection。Applicable temperature is based on bolt material,Such as35The bolt manufactured by steel can be reached350℃;25Cr2MoVASteel manufactured bolts、Applicable temperature570℃。


7 32in brass tube


2.Double head bolt


(7 32in brass tube)7 32in brass tube


Double bolts used on craft pipelines,Most of the other long double head refined bolts,Figure12-2-9Shown。Suitable flange connection with high temperature and pressure。Material35Steel、30CrMoA、35CrMoA、25Cr2MoVA、0Cr19Ni9、0Cr15Ni25Ti2MoAlVBand37SiMn2MoVAWait,Nominal pressure range is1.6~32.0MPa,Applicable temperature700℃。

3.Nut

Nut,Hexagon。Squeezing half of hard and refined。According to the form of nut structure, it can also be divided intoAType andBTwo types,Figure12-2-10Shown。

Semi-single single-headed boltANut;Refined double boltsBNut。Nuts and bolts to be used,However, the hardness of the nut manufacturing material cannot exceed the hardness of the bolt material.。


7 32in brass tube


7 32in brass tube


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