According the Technical Department of ThyssenKrupp Veerhaven B.V., all the Maprom demountable rubber stave bearings (except for the port A bracket bearing which was replaced due to damage in 1992) and their Maprom NCB hard coated tail shaft liners have never been replaced. During the drydocking, the measured clearance between bearings and shaft liners after 28 years of continuous operation was recorded at a maximum of 2.8mm.<\/p>\n
The Maprom recommended change out clearance for this application with shaft liner dimensions of 240 mm is maximised at 4.9mm. Based on this, the Technical Department of ThyssenKrupp Veerhaven decided not to renovate the propeller shaft installation and thus stretch the 204.000 running hours to even higher record levels.<\/p>\n
All river pushboats of Veerhaven comply to classification rules of Dutch Scheepvaart inspectie, according to which no shafts have to be withdrawn for class inspection every five years. As the over shaft clearance is still within acceptable limits it was decided not to pull the shaft or to replace the perfect operating bearings and shaft liners. The shafts have only been pulled once in 28 years of in order to change from conventional installed stuffing boxes to Maprom GS shaft seal.<\/p>\n
During the February drydocking the engines were overhauled, propellers balanced and all three nozzles replaced by new ones without removing the propeller shafts.<\/p>\n
ThyssenKrupp Veerhaven B.V. is a long term customer of Maprom Engineering\u2019s water lubricated sterntube systems. All the Veerhaven operated river pushboats operate exclusively with Maprom designed and supplied closed water lubricated propeller shaft installations.<\/p>\n
Its fleet consists of 7 push boats, all having three 1,800bhp to run at a speed of 12 km\/hr as well as a harbour push boat and some 70 pushed barges plus two inspection boats.<\/p>\n","protected":false},"excerpt":{"rendered":"
During the February 2009 drydocking of the in 1981 built pushboat Veerhaven V, it was discovered that the vessel has logged over 204,000 running hours on two of its three closed water lubricated sterntube systems without ever changing its propeller shaft bearings, shafts or shaft sleeves.<\/p>\n","protected":false},"author":8,"featured_media":1369,"comment_status":"closed","ping_status":"closed","sticky":false,"template":"","format":"standard","meta":{"_acf_changed":false,"footnotes":""},"categories":[11],"tags":[],"sponsor":[],"class_list":["post-1368","post","type-post","status-publish","format-standard","has-post-thumbnail","hentry","category-power-propulsion"],"acf":[],"_links":{"self":[{"href":"https:\/\/www.maritimejournal.com\/get-set-for-workboat-2050\/wp-json\/wp\/v2\/posts\/1368","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/www.maritimejournal.com\/get-set-for-workboat-2050\/wp-json\/wp\/v2\/posts"}],"about":[{"href":"https:\/\/www.maritimejournal.com\/get-set-for-workboat-2050\/wp-json\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"https:\/\/www.maritimejournal.com\/get-set-for-workboat-2050\/wp-json\/wp\/v2\/users\/8"}],"replies":[{"embeddable":true,"href":"https:\/\/www.maritimejournal.com\/get-set-for-workboat-2050\/wp-json\/wp\/v2\/comments?post=1368"}],"version-history":[{"count":1,"href":"https:\/\/www.maritimejournal.com\/get-set-for-workboat-2050\/wp-json\/wp\/v2\/posts\/1368\/revisions"}],"predecessor-version":[{"id":1370,"href":"https:\/\/www.maritimejournal.com\/get-set-for-workboat-2050\/wp-json\/wp\/v2\/posts\/1368\/revisions\/1370"}],"wp:featuredmedia":[{"embeddable":true,"href":"https:\/\/www.maritimejournal.com\/get-set-for-workboat-2050\/wp-json\/wp\/v2\/media\/1369"}],"wp:attachment":[{"href":"https:\/\/www.maritimejournal.com\/get-set-for-workboat-2050\/wp-json\/wp\/v2\/media?parent=1368"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/www.maritimejournal.com\/get-set-for-workboat-2050\/wp-json\/wp\/v2\/categories?post=1368"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/www.maritimejournal.com\/get-set-for-workboat-2050\/wp-json\/wp\/v2\/tags?post=1368"},{"taxonomy":"sponsor","embeddable":true,"href":"https:\/\/www.maritimejournal.com\/get-set-for-workboat-2050\/wp-json\/wp\/v2\/sponsor?post=1368"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}