CN202349493U - Dual-metal composite pipe joint - Google Patents

Dual-metal composite pipe joint Download PDF

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Publication number
CN202349493U
CN202349493U CN2011205254627U CN201120525462U CN202349493U CN 202349493 U CN202349493 U CN 202349493U CN 2011205254627 U CN2011205254627 U CN 2011205254627U CN 201120525462 U CN201120525462 U CN 201120525462U CN 202349493 U CN202349493 U CN 202349493U
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CN
China
Prior art keywords
pipe
joint
core
pipe joint
composite bimetal
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Expired - Lifetime
Application number
CN2011205254627U
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Chinese (zh)
Inventor
戚东涛
丁楠
蔡雪华
李厚补
张淑慧
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
China National Petroleum Corp
CNPC Tubular Goods Research Institute
Original Assignee
China National Petroleum Corp
CNPC Tubular Goods Research Institute
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Publication date
Application filed by China National Petroleum Corp, CNPC Tubular Goods Research Institute filed Critical China National Petroleum Corp
Priority to CN2011205254627U priority Critical patent/CN202349493U/en
Application granted granted Critical
Publication of CN202349493U publication Critical patent/CN202349493U/en
Anticipated expiration legal-status Critical
Expired - Lifetime legal-status Critical Current

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Abstract

The utility model discloses a dual-metal composite pipe joint for a fiber reinforced thermoplastic plastic pipe for improving corrosion resistance and reducing cost. The dual-metal composite pipe joint comprises a reinforced thermoplastic plastic pipe, a joint sleeve and a core pipe, wherein an inner pipe of the core pipe is made of stainless steel or corrosion resistant alloy, and an outer pipe of the core pipe is made of carbon steel; the core pipe is formed by welding the outer pipe and the inner pipe, and is inserted into the reinforced thermoplastic plastic pipe; and the joint sleeve pipe is compactly combined outside the reinforced thermoplastic plastic pipe. The dual-metal composite pipe joint not only can be used as the connection manner of the reinforced thermoplastic plastic pipe when a corrosive medium is transported in an oil gas industry, but also can expand to the connection of other non-metal pipelines. An RTP (Reinforced Thermoplastic Pipe) with the joint can be more widely applied to oil fields at home and abroad due to a large potential shown by the RTP and an increasing severe environment of oil gas transportation.

Description

A kind of composite bimetal pipe joint
Technical field
The utility model relates to a kind of oil gas field and uses the nonmetallic pipe joint, particularly a kind of composite bimetal pipe joint of fiber reinforced thermoplastics pipe.
Background technique
Tubing is being born the key player who carries various media in petroleum industry.The puzzlement that metal pipe is usually corroded in application; Glass Steel Tube exists the shortcoming of shock resistance, switching performance difference; Common polyvinyl piping materials bearing capacity can not satisfy the high-pressure delivery requirement again; Under this background, reinforced thermoplastics composite pipe (RTP) becomes the novel oil gas conveying that emerges in large numbers in recent years and uses composite material pipe.The RTP pipe adopts three-decker mostly, normally corrosion-resistant, the anti abrasive thermoplastic pipes of internal layer, and the mesosphere has been the enhancement layer of humidification, skin is the external coating that shields; Wherein enhancement layer uses reinforcing fiber (like aramid fibre, can use wire etc. in addition) to form through twining, weaving more.The RTP pipe has been successfully applied to land and offshore oil and gas field at home and abroad at present.
RTP tubing has two kinds of connections: being connected between a kind of RTP of being tubing and RTP tubing, a kind of in addition is to coil being connected of RTP pipe end and other tubing and pipe fitting (like valve, threeway etc.).The technology that the RTP pipe end connects has two kinds---and electric smelting-hot melt connects and is connected (be also referred to as and withhold connection) with the mechanical compaction mode.It is to dock RTP pipe hot melt earlier that electric smelting-hot melt connects, and moves on to joint energising welding (connecting sleeve can bear axial load) to the enhancing electric smelting connecting sleeve of special use then.It is similar that used welding equipment and common polythene pipe-line system are used, and just hot melt cover length is longer, adopts reinforcing material when pressure is higher.It is to insert RTP to the socket end of a metal pipe element that the mechanical compaction mode connects, and at metallic sheath of RTP overcoat, is packed together to the joint that can guarantee to seal and bear axial load to metallic sheath-RTP pipe end-pipe fitting socket end with mechanical means.The connection of similar high-pressure rubber pipe.
The Placement of RTP comprises that mainly electricity/hot melt connects, withholds flange and connects, withholds and be threaded etc.Electricity/hot melt connects the main bonding join strength that provides that leans on thermoplastic self; Can not bear higher working pressure, and traditional joint of withholding is a carbon steel material, corrodes easily with the flowing medium position contacting; If joint adopts stainless steel or corrosion resistant alloy, cost is too high again.
The model utility content
The utility model technical problem to be solved provides a kind of composite bimetal pipe joint that improves decay resistance and the fiber reinforced thermoplastics pipe that reduces the cost.
Concrete technological scheme is realized by following steps:
A kind of composite bimetal pipe joint comprises:
Reinforced thermoplastics pipe, swagelok 1 and core pipe 3; The interior pipe 5 of core pipe 3 is stainless steel or corrosion resistant alloy; The outer tube 6 of core pipe is a carbon steel; Outer tube 6 forms core pipe 3 with interior pipe 5 welding, and core pipe 3 is inserted in the reinforced thermoplastics pipe, and swagelok 1 is connected outward with the pipe of reinforced thermoplastics pipe through forging and pressing.
Preferably, the two halves structure of described outer tube 6 for radially dividing equally.
Preferably, be the ring-type tongue and groove on described outer tube 6 tube walls, its cross section is a sawtooth 7.
Preferably, described sawtooth 7 angles are 15 ° or 20 °.
Preferably, on the inwall of described swagelok the ring-type tongue and groove, its cross section is a flexuose.
Preferably, described composite bimetal pipe joint also comprises nut 2.
Preferably, described composite bimetal pipe joint also comprises packing ring 4, and nut 2 includes built-in packing ring 4 respectively with between core pipe 3 and sleeve pipe 1 are connected.
Suitable material can be chosen according to the medium of carrying in the position that the utility model joint core pipe contacts with medium; Satisfy the anti-corrosion requirement of tubing; Owing to just on the core pipe, coated one deck stainless steel or corrosion resistant alloy material, greatly reduce the whole cost that adopts stainless steel or corrosion resistant alloy of joint or core pipe simultaneously.The reinforced thermoplastics pipe adopts the joint Placement of the utility model, can satisfy the needs of carrying the high pressure aggressive medium, overcomes traditional carbon steel and connects corrosion-prone shortcoming.The part that contacts with fluid is selected suitable stainless steel or corrosion resistant alloy material for use according to medium character, for piping design provides great facility.The Placement of reinforced thermoplastics pipe also can extend to the connection of other nonmetal pipeline when this composite bimetal pipe joint both can be used as gas industries conveying aggressive medium.In view of the great potential that RTP pipe is shown is carried the harsh day by day of environment with oil gas, the RTP of this joint form manages and is expected at home and abroad that the oil field obtains using more widely.
Description of drawings
Fig. 1: be a kind of composite bimetal pipe joint structure schematic representation that the utility model embodiment provides.
Fig. 2: the core tubular construction schematic representation that is a kind of composite bimetal pipe joint of providing of the utility model embodiment.
1, pipe 6, core pipe outer tube 7, sawtooth in sleeve pipe 2, nut 3, core pipe 4, packing ring 5, the core pipe.
Embodiment
Below in conjunction with embodiment the utility model is further described in detail, the embodiment who provides has been merely and has illustrated the utility model, rather than in order to limit the scope of the utility model.
Embodiment 1
At first prepare core pipe as shown in Figure 2, it comprises pipe 5 and outer tube 6 two-part in the core pipe.Adopt pipe 5 in stainless steel or the corrosion resistant alloy material moulding, the thick 3mm of inner tubal wall, shape is as shown in Figure 2; Outer tube is initially the two halves structure of radially dividing equally, and wall thickness (containing tooth depth 2mm) is 5mm, the two halves outer tube with after interior pipe cooperates radially joint weld form outer tube, sawtooth 7 angles of outer tube 6 concave-convex surface grooves are 15 °.Insert after the moulding of core pipe in the RTP pipe.The casing pipe sleeve that with screwed wall thickness is 3mm adopts hydraulic pressure installation that sleeve pipe is forged and pressed to correct position outside the RTP pipe then, and the hydraulic pressure amount can be combined closely to guarantee joint and body through control hydraulic pressure to empirical value size, specifically can be as shown in Figure 1.To put into nut with the polytetrafluoroethylene gasket that is slightly less than minor diameter of thread, promptly form the composite bimetal pipe SEALING FITTING after tightening.
Embodiment 2
At first prepare core pipe as shown in Figure 2, it comprises pipe and outer tube two-part in the core pipe.Adopt pipe 5 in stainless steel or the corrosion resistant alloy material moulding, the thick 2mm of inner tubal wall, shape is as shown in Figure 2; Outer tube is initially the two halves structure of radially dividing equally, and wall thickness (containing tooth depth 2mm) is 4mm, the two halves outer tube with after interior pipe cooperates radially joint weld form outer tube, sawtooth 7 angles of outer tube 6 concave-convex surface grooves are 20 °.Insert after the moulding of core pipe in the RTP pipe.The casing pipe sleeve that with screwed wall thickness is 3mm is outside the RTP pipe.Adopt special tool inside and outside the core pipe, to rise, adopt hydraulic pressure installation, combine closely to guarantee joint and body through controlling suitable hydraulic pressure amount to pressing in the sleeve pipe, specifically can be as shown in Figure 1.To put into nut with the viton gasket that is slightly less than minor diameter of thread, promptly form the composite bimetal pipe SEALING FITTING after tightening.
The above only is the preferred embodiment of the utility model, so all equivalences of doing according to the described structure of the utility model patent claim, characteristic and principle change or modify, includes in the utility model patent claim.

Claims (7)

1. composite bimetal pipe joint; It is characterized in that, comprising: reinforced thermoplastics pipe, swagelok (1) and core pipe (3), the interior pipe (5) of core pipe (3) is stainless steel or corrosion resistant alloy; The outer tube of core pipe (6) is a carbon steel; Outer tube (6) forms core pipe (3) with interior pipe (5) welding, and core pipe (3) is inserted in the reinforced thermoplastics pipe, and swagelok (1) is connected outward with the pipe of reinforced thermoplastics pipe through forging and pressing.
2. composite bimetal pipe joint according to claim 1 is characterized in that, the two halves structure of described outer tube (6) for radially dividing equally.
3. composite bimetal pipe joint according to claim 2 is characterized in that, is the ring-type tongue and groove on described outer tube (6) tube wall, and its cross section is sawtooth (7).
4. composite bimetal pipe joint according to claim 3 is characterized in that, described sawtooth (7) angle is 15 ° or 20 °.
5. composite bimetal pipe joint according to claim 1 is characterized in that, is the ring-type tongue and groove on the inwall of described swagelok (1), and its cross section is a flexuose.
6. composite bimetal pipe joint according to claim 1 is characterized in that, described composite bimetal pipe joint also comprises nut (2).
7. according to the arbitrary described composite bimetal pipe joint of claim 1-6, it is characterized in that described composite bimetal pipe joint also comprises packing ring (4), nut (2) includes built-in packing ring (4) respectively with between core pipe (3) and sleeve pipe (1) are connected.
CN2011205254627U 2011-12-15 2011-12-15 Dual-metal composite pipe joint Expired - Lifetime CN202349493U (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
CN2011205254627U CN202349493U (en) 2011-12-15 2011-12-15 Dual-metal composite pipe joint

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
CN2011205254627U CN202349493U (en) 2011-12-15 2011-12-15 Dual-metal composite pipe joint

Publications (1)

Publication Number Publication Date
CN202349493U true CN202349493U (en) 2012-07-25

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Family Applications (1)

Application Number Title Priority Date Filing Date
CN2011205254627U Expired - Lifetime CN202349493U (en) 2011-12-15 2011-12-15 Dual-metal composite pipe joint

Country Status (1)

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CN (1) CN202349493U (en)

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN104930292A (en) * 2015-06-23 2015-09-23 陕西延长石油(集团)有限责任公司研究院 RTP pipe joint
CN109595410A (en) * 2018-12-28 2019-04-09 中国石油天然气集团有限公司 A kind of on-site connection joint and method for reinforced thermoplastics pipe
CN110805768A (en) * 2019-12-05 2020-02-18 陕西欣欣智能管业有限公司 Composite metal joint and manufacturing method

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN104930292A (en) * 2015-06-23 2015-09-23 陕西延长石油(集团)有限责任公司研究院 RTP pipe joint
CN109595410A (en) * 2018-12-28 2019-04-09 中国石油天然气集团有限公司 A kind of on-site connection joint and method for reinforced thermoplastics pipe
CN110805768A (en) * 2019-12-05 2020-02-18 陕西欣欣智能管业有限公司 Composite metal joint and manufacturing method

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Granted publication date: 20120725