One, what is large requirements is not had seam a canal?

Large requirements is not had seam a canalWhat point to normally is external diameter is inΦ 406mm (16 inches) reach aboveseamless steel tube. This size scope had exceeded the convention of aircrew of standard seamless steel tube to produce range, need specialized heavy equipment and technology to make.

As a result of its " without seam " and " large requirements " characteristic, it was united in wedlockWithout function of the whole that seam a canal evenadvantage andBig diameter bears the weight of / convey ability strongadvantage.

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2, basically characteristic

1. Bear control capacity extremely strong: Because do not have welding line this potential weak point, can bear extremely tall interior and outside pressure.

2. Mural large range is wide: Can produce wait for a wall from which thick the steel tube to extremely large wall, contented and different intensity and bearing requirement.

3. Sectional stiffness is big: Tremendous diameter gifted it is fought exceedingly goodly bend and fight be out of shape ability.

4. Applicable and harsh environment: Below the abominable operating mode such as high temperature, high pressure, low temperature or caustic medium, than soldering the canal has higher security and reliability.

5. Production technology is sophisticated, cost is high: Pull current Cheng is long, installation cost is huge, extremely tall to technology control requirement, the price is accordingly high.

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3, basically workmanship

Large requirements produces craft and tradition without what seam a canal in all-bore without seam a canal to have remarkable distinction, mainstream method includes:

1.Heat squashs law

• Process: Put heating round billet extruder, with enormous pressure (several tons of force) make its pass an annular mould " crowded piece " into steel tube.

• Advantage:

• Flexibility is extremely tall, it is complex, difficult to can produce figure the tubal material of frit metal.

• Suit the production of all lot, much norms, tall alloy steel.

• Defect: Cost is relative taller, exterior quality and dimension precision may inferior slightly at perforative rolling.

2.Inclined make friends punchs + make friends provides a way (group of large scale computer)

• Process: Principle and in all-bore without seam a canal identical, but equipment scope is vast. Use large card punch of inclined make friends (card punch of the type that be like bacterium) and be restricted to move core club to provide even roll steel engine a future life to produce.

• Advantage: Manufacturing efficiency is tall, crop is big, suit large-scale batch production.

• Defect: Installation cost is day price, apply to a few steely enterprise only.

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4, basically use a field

Large requirements does not have the function that seams a canal to cannot be replaced because of its, be used at the following and crucial domain:

1. Energy industry

• Utility boiler: Use at creating the high temperature maximum pressure of group of large scale computerHeaderAndAdvocate vapour conduit.

• Nuclear report: Of nuclear power plantVapour generator conducts heat canal, Pressure vessel brace, Be in charge ofEtc, the safe level with extremely high demand and dependability.

• Petro-chemical: Conduit of craft of reactor, heat exchanger, high pressure, be in especially high temperature high pressure, face hydrogen, fight corrode operating mode to fall.

Oil gas exploitation and carry

• Wildcat bushing: AsTechnical bushingOrManufacturing bushing, use at the slashing and geological condition such as air pocket of extradeep well, high pressure.

• High-pressured collect is defeated by conduit: Oil field interior transports high-pressured oil gas.

Heavy machinery and structure

• Canister of hydraulic pressure crock: Use at giant the engineering is mechanical (like machine of compose of large grab, aegis) oil cylinder cylinder body.

• Bearing ferrule: Headstock of wind- driven generation set, large marine.

• Large pressure vessel: The cylindrical shell of the heavy equipment such as production hydrogenation reactor, coal liquefaction reactor.

National defence and aerospace

• Use at canal of body of rocket motor housing, artillery to wait.

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5, be in charge of with large requirements solder quite

This is a very serious type selecting problem. Why to not hesitate sometimes should cost also choose large requirements to not have seam a canal?

Feature	Large requirements is not had seam a canal	Large requirements solder is in charge of (like UOE, JCOE)
Large dominant position	Integral sex, Gao Ke relies on gender, security	Cost efficiency of low, production is tall, producible exceed big diameter
Structural weakness	Without	Put in a fore-and-aft welding line
Bear control capacity	Extremely tall, isotropy	Tall, but welding line area is weak point, bear press ability to suffer welding line quality possibly to restrict
Mural thick uniformity	Very	First-rate (make by flat into)
Big diameter	Opposite and finite (normally ≤ Φ 660mm)	Accept restriction scarcely (can amount to Φ 4000mm above)
Cost	Very tall	Relatively inferior
Applicable setting	Corrode extrahigh voltage, superhigh temperature, by force, hand in change the extreme operating mode such as load	Sunday run oil gas is carried, building construction, water is carried etc

Type selecting conclusion:

• InSecurity is crushing everythingcircumstance (chemical industry of place of key of the report that be like a nucleus, deep well, high pressure) , orDo not allow to be put in fore-and-aft welding line on the structurecircumstance (be like canister of crock of large hydraulic pressure) , must useLarge requirements is not had seam a canal.

• InLarge requirements, Sunday run is carriedAnd the circumstance with relatively stable operating mode (if terrestrial oil gas is trunk) , The large requirements solder of high quality is in charge ofBe more economy, more the choice of the mainstream.

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Summary

Large requirements is not had seam a canalIt is technology of domain of seamless steel tube and production commanding elevation, it was represented right in extreme industry applicationSecurity and material integralitypursuit. It is not current data, exist to solve difficult problem of industry of specific high end however " crucial part " .