CN103797353A - 用于监测海底部件(尤其电缆连接器)的状况的装置和方法 - Google Patents
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Abstract
一种水下监测装置,包括设置在聚合物护套(11,14)中的金属部件(12)、以及可用于灵敏指示该金属部件与护套之间的交界面处的PH值的构件(10)。该金属部件可以是连接器的金属壳体。当电缆(13)从连接器伸展时,在靠近连接器处,电缆将被聚合物护套覆盖。所述构件(10)可包括化学指示剂,护套优选为半透明而足以能用肉眼直观观察指示剂。化学指示剂可包括酚酞。
Description
技术领域
本发明涉及对海底金属部件(如电缆连接器)进行监测,尤其涉及警示这类部件的聚合物护套将要发生剥离。
背景技术
在水下由于腐蚀电池的产生而会出现金属腐蚀。钢和许多其他金属在水下电化学性质不稳定,因此在没有保护措施的情况下将会发生腐蚀。因此,水下使用的大多数金属连接到牺牲阳极上。电化学腐蚀将会引起活性更大的金属(牺牲阳极)溶解。在腐蚀电池中,阴极不溶解,从而可主要保护金属。但是,以这种方式保护水下基础结构会引起海底电缆出现阴极剥离,人们认识到阴极剥离是引起海底电缆故障的主要原因。
发明内容
本发明认为,通过监测金属部件(如,连接器的金属壳体)和该金属部件的保护性聚合物护套之间的交界面处的局部PH值,可对海底部件进行监测。在本发明的优选形式中,提供了一种能在十分长的时间内进行这种监测的装置。
在一种形式中,本发明提供了一种水下装置,其包括设置在聚合物护套中的金属部件,还包括用于可灵敏显示该金属部件和护套之间的交界面处的PH值的构件。
该金属部件可以是连接器的金属壳体。术语“连接器”用于表示连接到水下壳体或其他结构上的电缆连接器的任何结构,不论是可释放或不可释放的,不论是进行外部连接或内部连接(在“穿透器”的实例中)。当电缆从连接器伸展时,靠近连接器的电缆部分将被聚合物护套覆盖。所述构件可包括化学指示剂,护套优选半透明以足以能用肉眼直观观察指示剂。化学指示剂可以包括酚酞。
本发明还提供了一种制造用于海底电缆连接器的PH值指示器的方法,该海底电缆连接器具有金属壳体,该方法包括以下步骤:
(i)将半透明的热缩套筒设置在壳体上;
(ii)将套筒的一端收缩到壳体上以在套筒和壳体之间形成容器;
(iii)使容器中局部填充有化学指示剂溶液;
(iv)热缩套筒的另一端以密封套筒内的指示剂;以及
(v)将电缆连接到连接器上。
该方法优选还包括步骤:将半透明的聚合物护套模制在套筒和靠近连接器的电缆上。
附图说明
图1是说明图,示出了牺牲阳极;
图2至4示出了阴极剥离过程的各阶段;
图5A至5B示意性示出了本发明的操作过程;
图6示出了本发明的一个实施例;以及
图7A至7F示出了制造本发明的一个实施例的方法。
具体实施方式
如前所述,海水中由于腐蚀电池的产生而会出现金属腐蚀。图1示意性示出了典型的牺牲腐蚀电池。起到阴极作用的水下结构(如壳体1)浸没到电解质(海水)2中,通过一些导电通路3直接连接到牺牲阳极4上,牺牲阳极通常由锌制成。电化学腐蚀将引起活性更大的金属(牺牲阳极)溶解。在图1所示的这种腐蚀电池中,阴极1不溶解,从而可保护所述水下结构不发生腐蚀。但是,以这种方式来保护水下基础结构会引起一种称之为阴极剥离的过程,人们认为这种阴极剥离过程是引起海底电缆故障的主要原因。
图2至4示出了海底电缆发生阴极剥离的过程中的不同阶段。在海底电缆中,通过将图2所示的防水聚合物护套6模制在金属连接器8上,通常可保护金属连接器免受海水损害。金属连接器8连接到牺牲阳极4上。
在牺牲阳极4和海水2的交界面处,金属(锌)发生电离:
Zn→Zn+++2e-
在金属连接器8的金属和模制件6的交界面5处,当聚合物模制件6中浸透海水和溶解的氧时,通过下面的反应过程形成氢氧离子:
2H2O+O2+4e-→4OH-
在阴极极化表面和直接连接到该阴极极化表面上的材料之间的交界面的区域7(如图3所示)中,这种反应会使PH值(碱性)十分高。金属/聚合物交界面处的PH值高会产生高的渗透压,导致在交界面处出现水疱(water blistering)9,最终聚合物6会从金属8上剥离下来,随后出现电缆故障(图4)。要发生这种反应,聚合物中必须浸透水和氧。所有聚合物具有一定的渗透性,最终聚合物中会含有充足的水和氧而发生阴极剥离过程。
因为聚合物和金属部件之间的交界面处的PH值变化是发生起疱的先兆,因此,金属聚合物交界面上的PH值指示剂能在任何剥离现象出现之前早期提示电缆剥离的发生。重要的是,由于PH值变化大(碱性高),因此,可通过化学指示剂监测这种变化。
在图5A和5B所示的一个实例中,PH指示器的层10布置在电缆连接器12的金属部件和模制在该部件上的聚合物模制件11之间的交界面处。该指示剂可直观显示,即,如图5中所示的颜色变化,因此,在该金属部件上进行模制时必须考虑PH值指示剂的可见性要求。因此,在PH值指示剂区域周围,模制的聚合物应该透明,或至少半透明以足以在合适间隔处可用肉眼直观观察指示剂。
如上所述那样使用的PH值指示剂需要长时保持稳定,通常至少在几年内保持稳定。酚酞是一种用于PH值指示剂的标准溶液。酚酞在PH值为1(高酸性)至大致为9(碱性)时保持透明,PH值从9变化至14(高碱性)的过程中变为红色或粉色。粉末态酚酞稳定性高,没有指定的保存期。要用作PH值指示剂,酚酞可与乙醇混合。这种指示剂溶液的稳定性取决于溶液浓度;由于乙醇蒸发或其他损耗,该溶液浓度随时间会发生变化。在这种水下环境下,酚酞溶液可容纳在不透气不漏水的模制件中,这样可阻止乙醇损耗,因此可保持指示剂溶液的稳定性。
本发明并不局限于使用酚酞。其他可能的化学指示剂包括百里酚蓝、刚果红、甲基红、甲基橙、石蕊精、酚红等。
图6示出了一个实施例,用于将电缆状况监测机构配置在典型的水下环境中。诸如脐带的海底电缆13配置有终端金属连接器12,该连接器可与歧管或树等水下结构1进行外部或内部连接。透明的覆盖式模制护套11包围连接器,由酚酞基指示剂构成的PH值传感器10设置在连接器外侧和护套之间的交界面处。
图7A至7F根据本发明示意性示出了一种制造PH值传感装置的方法。
图7A示出了在其上进行模制之前的金属连接器12。竖立放置该金属连接器(图7B),然后,如图7C所示,透明的热缩套筒14的一端(下端)收缩到连接器的金属体或壳体上,热缩套筒的另一端暂时不收缩。所述套筒可以是商业上可购买到的聚烯烃套管。这一过程可形成外观美观的空间15,使该空间中局部填充有酚酞乙醇溶液(图7D)。然后,热缩套筒14的开口端(上端)16收缩到连接器上(图7E)以密封与金属连接器接触的指示剂溶液。电缆13连接到金属连接器上,透明盖11覆盖式模制在金属连接器12上,如图7F所示,使透明盖沿电缆外侧从连接器伸展合适距离,以致由热缩套筒14和模制的透明盖11构成的护套至少覆盖电缆13的靠近金属连接器12的部分。所述透明盖11可以是商业上可购买的合适聚合物材料,如透明聚氨酯密封剂。
所述的化学PH值传感器将会变色为红色或粉色,警示将要发生阴极剥离故障。因此,具有嵌入式指示剂的连接器必须可以定期用肉眼直观观察到。通过远程操纵潜水器(ROV)(或浅水区中的潜水者)对水下结构进行的常规测量过程中包括这种观察。可供选择地,可通过照相机或闭路电视(CCTV)观察。
如果其他化学指示剂在所要求的长时使用期间十分稳定,那么,可以不使用酚酞基指示剂,而使用这些其他化学指示剂。
另外,可以采用电子PH值传感器在金属-护套交界处灵敏地电子显示PH值,而不是通过化学指示剂用肉眼直观观察。可通过连接器上的备用插头为这种电子传感器进行供电及通讯。这种传感器不需要视觉监测。但是,电子传感器目前并不是优选的,这是因为已经证实市场上可购买到的电子传感器不能长时(至少几年)保持稳定。
Claims (9)
1.一种水下装置,其包括设置在聚合物护套(11,14)中的金属部件(12),其特征在于还水下装置包括有构件(10),通过该构件可灵敏指示金属部件与聚合物护套之间的交界面处的PH值。
2.根据权利要求1的装置,其中,所述金属部件是海底电缆连接器(12)的金属壳体。
3.根据权利要求2的装置,其中,电缆(13)从所述连接器伸展,其靠近连接器(12)的部分被所述聚合物护套覆盖。
4.根据权利要求1-3中的任一权利要求的装置,其中,所述构件(10)包括化学指示剂,所述聚合物护套(11)半透明而足以用肉眼直观观察指示剂。
5.根据权利要求4的装置,其中,所述化学指示剂包括酚酞。
6.根据权利要求4或5的装置,其中,聚合物护套包括热缩套筒(14)和模制覆盖件(11)。
7.一种用于监测水下部件的状况的方法,该水下部件具有覆置在金属壳体上的保护性聚合物护套(11,14),该方法包括以下步骤:监测所述金属壳体和保护性聚合物护套之间的交界面(7)处的PH值。
8.一种制造用于海底电缆连接器(12)的PH值指示器的方法,该海底电缆连接器具有金属壳体,该方法包括以下步骤:
(i)将半透明的热缩套筒(14)设置在所述金属壳体上;
(ii)将热缩套筒(14)的一端收缩到所述金属壳体上以在该热缩套筒和金属壳体之间形成容器(15);
(iii)使容器(15)中局部填充有化学指示剂溶液;
(iv)对所述热缩套筒的另一端(16)进行热缩处理以密封该热缩套筒内的指示剂;以及
(v)将电缆(13)连接到该海底电缆连接器上。
9.根据权利要求8的方法,还包括以下步骤:将半透明的聚合物覆盖件(11)模制在所述套筒和靠近海底电缆连接器的电缆(13)上。
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PCT/GB2013/000215 WO2013175155A1 (en) | 2012-05-19 | 2013-05-14 | Device and method for monitoring the condition of subsea parts, particularly cable connectors |
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WO2015142639A1 (en) | 2014-03-15 | 2015-09-24 | De Pierola Nicolas | Detached retrievable outboard system and apparatus for sacrificial anodes |
EP3073049A1 (en) | 2015-03-26 | 2016-09-28 | Siemens Aktiengesellschaft | Method for determining an operational state of a subsea connector unit |
US10711591B2 (en) * | 2015-06-24 | 2020-07-14 | Magiq Technologies, Inc. | Sensing umbilical |
RU174421U1 (ru) * | 2016-08-22 | 2017-10-12 | Общество с ограниченной ответственностью "Завод нефтегазовой аппаратуры "Анодъ" | Протектор для защиты от коррозии металлических конструкций, находящихся в водной среде |
US11339631B2 (en) * | 2017-12-29 | 2022-05-24 | Sandvik Materials Technology Deutschland Gmbh | Downhole tubing or umbilical with sensor and method for manufacturing it |
US10608371B1 (en) * | 2018-06-04 | 2020-03-31 | The United States Of America As Represented By The Secretary Of The Navy | Undersea cable connector with internal debonding prevention |
GB201918323D0 (en) * | 2019-12-12 | 2020-01-29 | Siemens Ag | Subsea connector |
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GB201208986D0 (en) | 2012-07-04 |
WO2013175155A1 (en) | 2013-11-28 |
RU2014109697A (ru) | 2016-07-10 |
CA2844418A1 (en) | 2013-11-28 |
GB201401927D0 (en) | 2014-03-19 |
US20140199775A1 (en) | 2014-07-17 |
NO20140222A1 (no) | 2014-02-20 |
CN103797353B (zh) | 2016-08-24 |
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