CN1081525C - 管道接头保护装置及其安装方法 - Google Patents
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
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- F16L—PIPES; JOINTS OR FITTINGS FOR PIPES; SUPPORTS FOR PIPES, CABLES OR PROTECTIVE TUBING; MEANS FOR THERMAL INSULATION IN GENERAL
- F16L58/00—Protection of pipes or pipe fittings against corrosion or incrustation
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- B29C44/12—Incorporating or moulding on preformed parts, e.g. inserts or reinforcements
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- B—PERFORMING OPERATIONS; TRANSPORTING
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- B29C44/12—Incorporating or moulding on preformed parts, e.g. inserts or reinforcements
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- F16L—PIPES; JOINTS OR FITTINGS FOR PIPES; SUPPORTS FOR PIPES, CABLES OR PROTECTIVE TUBING; MEANS FOR THERMAL INSULATION IN GENERAL
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
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- F16L—PIPES; JOINTS OR FITTINGS FOR PIPES; SUPPORTS FOR PIPES, CABLES OR PROTECTIVE TUBING; MEANS FOR THERMAL INSULATION IN GENERAL
- F16L13/00—Non-disconnectible pipe-joints, e.g. soldered, adhesive or caulked joints
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Abstract
一种用于保护海底应用场合所用的重量罩复管道上外露接头的方法和装置。该方法能在驳船上快速安装, 在那里将管道部分焊接在一起以供海底安装。该方法在搬运前不需要长时间固化。该方法通过在外露管道接头上的圆柱形罩复材料套筒内形成一可弯挠的聚氨基甲酸乙酯板来保护管道接头部分(18,18A)上未用重量罩复物罩复的抗腐蚀涂层(24)。该聚氨基甲酸乙酯化学品起反应以形成一充满管子与罩复材料套筒(40)之间的环形空间的高密度泡沫(52)。罩复材料套筒和泡沫形成一用于保护接头的复合系统,从而使该泡沫提供连续压缩增强和抗冲击力,该套筒提供抗刺穿能力、对水喷射开沟工序的保护再加上抗磨损能力。
Description
本发明涉及管道接头保护装置。具体地说,本发明涉及一种对用于海底应用场合的重量罩覆管道上的外露管接头进行保护的装置和方法。
在海底管道业中通常的做法是采用装设在海底或其它水下表面上的用于管道的重量罩覆保护装置。一般所用的重量罩覆系由绕管道圆周若干英寸厚的致密材料、往往是混凝土制成。该重量罩覆对管道进行保护并提供足够的重量而使管道以一不浮起状态保持沉没。
重量罩覆除短距离外通常加在管的全长上,通常从每个管段的端部约一英尺起罩覆。管的端部仍无重量罩覆,以便于将被重量罩覆的管段焊接在一起而形成管道。
将管段放置在驳船上并依次焊接到前面的管段上以形成一从驳船延伸的管道。新形成的管道系在滚柱上,并且当驳船向前移动时,管道即承载在滚柱上、下降并放置在水体床上。
管上无重量罩覆的部分具有一加在管表面的防腐涂层以防止该管因外露而腐蚀。该防腐涂层通常采用热收缩带或熔化粘接环氧树脂。当将管段焊接在一起后,采用各种技术以保护每个接头周围的管的外露部分上的防腐涂层。
一种技术是在靠近管的外露部分的重量部分上缠绕金属片并用金属带将该金属片绑扎就位。通常采用一尺寸为26至28号的镀锌金属片。然后用一冷却后固化的熔融砂胶填充该管与金属片之间的空间。然而,在大多数情况下,管道在套筒填充后必须处于一供立即搬运的状态以没有延迟地进行管道敷设。砂胶填充物在所需时间内并不固化或硬化为一足够硬的材料,以能在砂胶足够固化前放下管道时对管道作进一步的处理并使砂胶吸足水分。
这种技术的另一个问题是用来使金属片固定就位的绑扎物及金属片本身在管道放置海底一段时间后会腐蚀。而一旦绑扎物腐蚀,则金属片的尖锐端将从管道松开。这就在进行商业捕捞区域产生一具体问题。金属片的尖锐端会割破被拖网船拉到管道上方的渔网。渔网被松开的金属片损坏对捕捞业产生严重的财务问题。在一些情况下,采用抗腐蚀的绑扎物如不锈钢绑扎物来避免这些问题,但这种做法较为昂贵而最终归于失败。
另一些技术是用其它材料代替砂胶填充物。在美国专利第5328648号揭示的方法中,管道的外露部分罩复有一其后用一填充材料填充的模具。填充材料为未紧密或均匀装填的粒状或颗粒状物如砾石或铁砂。然后将合成橡胶聚氨基甲酸乙酯或聚脲注入模具以填入粒状填充材料之间的空隙。在聚合物部件完全反应后,将模具从填入物表面去除。
由于填充材料通常是砾石必须被装到驳船上,故这种方法难以在驳船上装设接头保护装置时采用。此外,由于产生空隙的填充材料中的不均匀的聚合物分配,在完成的填入物中往往缺乏一致性。这种空隙会使防腐涂层外露并被可能碰到该沉没管道的、在水中移动的拖网或其它物体损坏。
美国专利第4909669号中揭示的另一技术涉及用热塑片材缠绕管道的外露部分。该片材在靠近外露接头的重量罩复的端部重叠,然后通过螺丝、铆钉或夹板固定就位。为提高刚性和抗冲击力,这种接头保护系统需要在片材内部安装加强件如塑料棒或塑料管。这种加强棒或管必须预先加以切割并存储在驳船上,或作为安装工序的一部分在驳船上切割到所需形式。这需要额外的搬运并使得安装工序更为困难。
另一种加强这种接头保护系统的方法是在管道与塑料片材之间的环形空间的下部填充一种材料,例如预先成形的泡沫半壳。当泡沫半壳被用于环形空间的下部以提供支承时,该接头的上部和防腐涂层即由封闭该无泡沫罩复的上部的塑料片材加以保护。如果管道装设在可能碰到鱼船拖网的拖绳或拖板,则会引起一特定问题。管道接头上部的防腐涂层可能被这种拖带物损坏。
这种接头保护系统的另一个问题出现在当将管道铺设在例如小于200英尺深的浅水中时。管道在浅水中往往通过采用朝向打算埋入管道的海底的高压水喷射方法来埋入。该水喷射洗刷出一条供管道落下并埋入的沟槽。当由于管道接头顶部上方的塑料片材未被加强时而使该水喷射与管道接头接触时,会损坏该接头保护系统。
本发明提供一种用于机械地保护外露管道接头部分的装置和方法。本发明的用于重量罩复海底水下管道的外露管道接头部的保护装置包括:一完全罩复该外露管道接头部、并密封就位以形成一围绕该管道的环形空间的、与该重量罩复的相邻端部重叠的可挠罩复材料;用一通过在该罩复材料内部对聚氨基甲酸乙酯化学品进行反应而形成的高密度通孔结构聚氨基甲酸乙酯泡沫的接头填充材料来填充外露管道与罩复材料之间的该环形空间;该通孔结构聚氨基甲酸乙酯泡沫接头填充材料吸收水分以增加管道的压载量。
本发明的安装一用于保护重量罩复海底水下管道的外露接头部的装置的方法包括以下步骤:围绕该外露接头部缠绕罩复材料,以使该罩复材料与该外露接头部一侧的重量罩复物重叠,并形成一围绕该管道的该接头部分的套筒;在该罩复材料内形成一开口;沿其侧面部分将该罩复材料一起密封,以在该接头部分与该罩复材料套筒之间形成一环形空隙;将一流体、快速固化、通孔结构泡沫接头填充系统成分通过开口注入该环形空隙;使该接头填充系统成分固化到一通孔结构内并充满所述空隙;以及使该通孔结构泡沫吸收水分并增加管道的压载量。
本发明为海底管道的接合部分提供机械保护和抗磨损能力,使之不会受到腐蚀问题,不会损坏渔网,也不会被埋设管道的水喷射损坏。
通过以下结合附图对于本发明的具体描述,将更好地理解本发明,其中:
图1为通过焊接接合的两部分重量罩复管道的示意图;
图2为一形成为封闭外露接头用圆柱形可挠罩复材料片材;
图3为表示围绕外露接头缠绕和密封的可挠罩复材料片材的纵向图;
图4为表示已加上接头保护系统后的接头部的纵向剖面图。
图1示出一将两个管道部分12和12A焊接在一起的管道10,该两个管道部分别通过一重量罩复物14和14A加以罩复。由混凝土或其它适当材料制成的重量罩复物14和14A,除每个管道部16和16A的管端部18和18A外,在圆周方向和纵向完全罩复管道部分16和16A。管端部18和18A外露,以便将两个管道部分12和12A作为管道的两个部分焊接在一起。然而,该外露的管端部18和18A在管道10中留下未被重量罩复物罩复的仅由一防腐涂层24罩复的管道空隙。
本发明的方法先是安装一罩复材料30,该罩复材料用于封闭并提供用于在管端部18和18A上的外露的防腐涂层24的结构保护。如图2所示,该较佳方法采用一可挠曲、高强度、并能形成一圆柱形的罩复材料30。该较佳罩复材料30系由高密度聚氨基甲酸乙酯制成,但也可采用其它热塑材料。可挠罩复材料30的厚度至少应为约0.02英寸,如需要一更强的支承和抗冲击力,则可厚得多。水深、管道尺寸、管道重量和其它因素均可决定厚度最大为1/2英寸的罩复材料30的使用。罩复材料30可以是平板状或预成形为圆柱状。
将可挠片材的罩复材料30缠绕入一绕外露管端部18和18A的圆柱形,以使圆柱形罩复材料30的内径与管道10上的重量罩复物14和14A的外径大致相等。罩复材料30的长度应足以与重量罩复物14和14A的相邻边缘的两侧面22和22A重叠若干英寸,以使重量罩复物14和14A能起用于罩复材料30的结构支承的作用。一旦将罩复材料30装在重量罩复物14和14A的相邻边缘22和22A上,则罩复材料30的侧缘34和36被紧密地按压在一起,从而使侧缘34和36重叠。罩复材料30可通过捆扎带绑紧并固定就位。然后使外缘34与罩复材料30密封并形成一密封套筒40。
该罩复材料30可通过将外缘34塑性焊接到罩复材料30的表面上而加以密封,并形成一如图3所示的对于罩复材料30整个长度的纵向延伸塑性焊接。也可采用其它密封装置如热溶合、铆接、粘合、胶带或绑扎来对罩复材料30进行密封。
密封的罩复材料套筒40围绕仍作为管道10的一永久部的管端部18和18A的外露部分而形成一保护屏障。通过安装罩复材料套筒40围绕管道18和18A形成一环形空间44。该环形空间44系通过首先在该密封罩复材料套筒40中切割一孔38、然后通过该孔38将流体接头填充系统成分注入该环形空间44而加以填充。
孔38可在该密封罩复材料套筒40中加以钻削、切割或另外制作,以能在其后将流体接头填充系统成分注入该环形空间44。孔38可以在重量罩复管道上安装之前预先切入罩复材料30或在密封罩复材料套筒40就位后切割。打算钻削的孔38的直径取决于用来注入接头填充系统成分的混合头的具体类型。工业标准或传统注入头均可。
在较佳方法中,该环形空间44系通过经带有混合头的孔38注入一快速固化聚氨基甲酸乙酯系统的成分而填充一高密度泡沫。聚氨基甲酸乙酯泡沫52作为一冲击吸收剂并保护管道18和18A上的防腐涂层。同时,由于该泡沫52系通孔结构,它能吸水份并提高管道10的压载效果。另外,也可采用其它聚合或固化流体化合物如水砂胶、快速固化混凝土、聚合物或弹性化合物填充空的环形空间。任何替代的填充材料最好是快速硬化的,以使铺设管道的过程不受阻碍。
在该过程中用于形成保护性高密度泡沫的较佳的聚氨基甲酸乙酯系统是异氰酸盐和多元醇系统的组合,这种组合在反应时快速固化并形成能在海水中抵抗分解的高密度通孔结构的聚氨基甲酸乙酯泡沫。较佳的异氰酸盐为Bayer公司制造的二苯基甲烷和二异氰酸盐的聚合形式。较佳的多元醇系统是多功能聚醚和/或聚酯多元醇、用于控制反应速度的触媒、用于增强单元形成的表面活化剂以及用于发泡剂的水的混合物。可接受的混合多元醇系统是由Dow化学公司和Bayer公司等制造的。
较佳的聚氨基甲酸乙酯系统产生一具有约8-10磅/立方英尺并具有约80%以上通孔结构密度的泡沫。较佳的聚氨基甲酸乙酯泡沫的抗压强度在10%变形处约为150磅/平方英寸以上,在90%变形处为1500磅/平方英寸以上。较佳的聚氨基甲酸乙酯系统成分的反应特点可表示为:15-20秒乳膏状时间、即从混合头排出与泡沫开始增长之间的时间,40-50秒增长时间、即从混合头排出与泡沫增长完成之间的时间,以及180-240秒固化时间、即增加聚合物强度和尺寸稳定性所需时间。
罩复材料套筒40起一模具的作用并将泡沫52固定就位,直至它被完全固化为止。如图4所示,该聚氨基甲酸乙酯泡沫52完全充满环形空间44而不留下较大的空隙区域。不必使用另外的填充材料与聚氨基甲酸乙酯泡沫52连接。该聚氨基甲酸乙酯泡沫52应完全充满环形空间44并向上凸出至一定程度上穿过罩复材料套筒40上的孔38。
图4示出按照本发明的接头保护系统的已完成的保护性罩复物。密封罩复材料套筒40与聚氨基甲酸乙酯泡沫52一起提供一保护系统,该保护系统在管道10搬运和铺设过程中保护外露的管道18和18A和防腐涂层24,并继续提供保护以不受因装在鱼船拖网上的拖绳或拖板而造成损坏。而且,密封罩复材料套筒40没有现有技术系统的腐蚀问题,故不会造成对于渔网的水下危险或危害。此外,本发明提供的保护系统还起到使管道埋设于浅水中用高压水喷射偏转作用,这种水喷射会损坏由现有技术系统保护的管道接头上的防腐涂层。
如前所述,本发明提供一种用于保护诸如用于海底应用场合重量罩复管道1-上12和12A上外露管道接头的防腐涂层24的装置和方法。该方法能在驳船上快速安装,在那里将管道部焊接在一起以供海底安装。管道接头18和18A上的没有重量罩复的防腐涂层24系通过将一可挠聚氨基甲酸乙酯形成到管道接头上的一圆柱罩复材料40内而加以保护的。采用聚氨基甲酸乙酯化学品进行反应并形成高密度泡沫52,该泡沫填充管道18和18A与罩复材料套筒40之间的环形空间44。该罩复材料套筒40与泡沫52一起工作以保护该接头。
应当理解,可以对上述本发明的实施例进行改进和变化,这些改进和变化不脱离如所附权利要求提出的精神和范围。
Claims (14)
1.一种用于重量罩复海底水下管道的外露管道接头部的保护装置,包括:
一完全罩复所述外露管道接头部、并密封就位以形成一围绕该管道的环形空间的、与所述重量罩复的相邻端部重叠的可挠罩复材料;
用一通过在所述罩复材料内部对聚氨基甲酸乙酯化学品进行反应而形成的高密度通孔结构聚氨基甲酸乙酯泡沫的接头填充材料来填充外露管道与罩复材料之间的所述环形空间;
所述通孔结构聚氨基甲酸乙酯泡沫接头填充材料吸收水分以增加管道的压载量。
2.如权利要求1所述的装置,其特征在于,所述可挠罩复材料由聚氨基甲酸乙酯形成。
3.如权利要求1所述的装置,其特征在于,所述罩复材料包括一形成为用将所述接头填充材料注入所述环形空间用的开口。
4.一种安装一用于保护重量罩复海底水下管道的外露接头部的装置的方法,包括以下步骤:
围绕所述外露接头部缠绕罩复材料,以使所述罩复材料与所述外露接头部一侧的重量罩复物重叠,并形成一围绕所述管道的所述接头部分的套筒;
在所述罩复材料内形成一开口;
沿其侧面部分将所述罩复材料一起密封,以在所述接头部分与所述罩复材料套筒之间形成一环形空隙;
将一流体、快速固化、通孔结构泡沫接头填充系统成分通过开口注入所述环形空隙;
使所述接头填充系统成分固化到一通孔结构内并充满所述空隙;以及
使所述通孔结构泡沫吸收水分并增加管道的压载量。
5.如权利要求4所述的方法,其特征在于,所述流体接头填充系统为一快速固化聚氨基甲酸乙酯系统。
6.如权利要求4所述的方法,其特征在于,所述罩复材料为可弯挠曲合成树脂板。
7.如权利要求4所述的方法,其特征在于,所述安装步骤包括以下步骤:
将所述树脂板形成于一围绕所述外露接头形成一环形囊的圆柱体内。
8.如权利要求4所述的方法,其特征在于,所述罩复材料通过热焊接加以密封。
9.如权利要求4所述的方法,其特征在于,所述罩复材料为一热塑合成树脂。
10.如权利要求4所述的方法,其特征在于,所述罩复材料为聚氨基甲酸乙酯。
11.如权利要求4所述的方法,其特征在于,所述罩复材料的厚度在约0.02英寸至0.5英寸之间。
12.如权利要求4所述的方法,其特征在于,所述开口被预先切入所述罩复材料内。
13.如权利要求4所述的方法,其特征在于,所述接头填充系统为一快速固化聚氨基甲酸乙酯系统,该系统在所述环形空隙中反应并形成一高密度通孔结构泡沫材料。
14.如权利要求4所述的方法,其特征在于,所述开口打开以使水通道进入所述通孔结构泡沫。
Applications Claiming Priority (2)
Application Number | Priority Date | Filing Date | Title |
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US08/694,397 | 1996-08-12 | ||
US08/694,397 US5900195A (en) | 1996-08-12 | 1996-08-12 | Protection of pipeline joint connections |
Publications (2)
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CN1227521A CN1227521A (zh) | 1999-09-01 |
CN1081525C true CN1081525C (zh) | 2002-03-27 |
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CN97197249A Expired - Fee Related CN1081525C (zh) | 1996-08-12 | 1997-08-12 | 管道接头保护装置及其安装方法 |
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US (2) | US5900195A (zh) |
EP (1) | EP0921923B1 (zh) |
CN (1) | CN1081525C (zh) |
AU (1) | AU711857B2 (zh) |
BR (1) | BR9711150A (zh) |
DK (1) | DK0921923T3 (zh) |
NO (1) | NO316502B1 (zh) |
WO (1) | WO1998006552A1 (zh) |
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Also Published As
Publication number | Publication date |
---|---|
NO316502B1 (no) | 2004-02-02 |
US5900195A (en) | 1999-05-04 |
AU711857B2 (en) | 1999-10-21 |
EP0921923A4 (en) | 1999-12-29 |
CN1227521A (zh) | 1999-09-01 |
AU4056297A (en) | 1998-03-06 |
NO990638L (no) | 1999-04-09 |
EP0921923A1 (en) | 1999-06-16 |
DK0921923T3 (da) | 2004-05-03 |
NO990638D0 (no) | 1999-02-11 |
BR9711150A (pt) | 1999-08-17 |
EP0921923B1 (en) | 2004-03-17 |
US6402201B1 (en) | 2002-06-11 |
WO1998006552A1 (en) | 1998-02-19 |
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