Overheating in Docklines and Rodes

................
VN:F [1.9.13_1145]
Rating: 0.0/10 (0 votes cast)

by Drew Frye, Practical Sailor
In the upcoming February 2019 issue of Practical Sailor, our testers evaluate the frequently repeated warning that under extreme loads, dock lines, drogue tow ropes, and anchor rodes can part due to overheating caused by internal friction between fibers as the line stretches and relaxes.

But what percentage of a rope’s breaking strength is considered an “extreme” load? And how does the frequency of the load cycling affect heat build-up? And most importantly, how can we prevent this intra-fiber heat buildup from occurring?

Ultimately, our testers found that although intra-fiber friction is a real threat, the more troublesome threat is our obvious enemy—external friction caused by rubbing on chocks, anchor rollers, docks, fairleads etc. And the risk of internal friction on smaller diameter ropes is far less likely than it is on larger diameter ropes.

Ropes greater than one-inch in diameter are subject to internal heating if loaded past their safe working limit or loaded at high frequency. Ground anchor and sea anchor rodes are cycled at low frequency; although the core will see some increase in temperature, it will not progress to the point of weakening the rope unless the rope is loaded beyond the 10:1 safe working limit. If the anchor rode is sized right, it will never be over-strained or overheated.

Sea anchor “rodes” as well as tow lines for drogues, on the other hand, are often specified at about the same size as anchor rode, even though they are subject to much greater forces than a boat anchored in a harbor. Instead of 10:1 safety factor, a line for a drogue or sea anchor could easily be operating at safety factor of 5:1, or even less. Thus, a larger sea anchor rode can indeed be weakened by internal heating.

Source: sailingscuttlebutt

VN:F [1.9.13_1145]
Rating: 0 (from 0 votes)

Diğer Konular


600true thumbnails bottomright 300true 800none
  • 5000 fade false 60 bottom 0 https://www.sualtigazetesi.com/?cat=1243
     SedenErdi
  • 5000 fade false 60 bottom 0 https://www.sualtigazetesi.com/?cat=1286
     AliNasman
  • 5000 fade false 60 bottom 0 https://www.sualtigazetesi.com/?cat=1296
     SelmaUca
  • 5000 fade false 60 bottom 0 https://www.sualtigazetesi.com/?cat=1294
     TuncayTanriverdi
  • 5000 fade false 60 bottom 0 https://www.sualtigazetesi.com/?cat=1299
     Selimsidali
  • 5000 fade false 60 bottom 0 https://www.sualtigazetesi.com/?cat=1284
     SelcenTaninmis
  • 5000 fade false 60 bottom 0 https://www.sualtigazetesi.com/?cat=1175
     CenkSahin
  • 5000 fade false 60 bottom 0 https://www.sualtigazetesi.com/?cat=1166
     UmutDincer
  • 5000 fade false 60 bottom 0 https://www.sualtigazetesi.com/?cat=1173
     HaldunSevel
  • 5000 fade false 60 bottom 0 https://www.sualtigazetesi.com/?cat=1168
     Slide11
  • 5000 fade true 60 bottom 0 https://www.sualtigazetesi.com/?cat=1177
     SGYELKENEnglish
  • 5000 fade false 30 bottom 0 https://www.sualtigazetesi.com/?cat=1310
     Slide12
  • 5000 fade true 30 bottom 0 https://www.sualtigazetesi.com/category/2kadin1mavi/
     2Kadin1Mavi
    2 Kadın 1 Mavi
 
 
 
 
 
 
 
 
 
 
 
 
 

600true dots under 150true 800https://www.sualtigazetesi.com/wp-content/plugins/thethe-image-slider/style/skins/white-square-2
  • 7000 fade false 60 bottom 0 https://www.sualtigazetesi.com/?p=123813
     DunyaSampiyonu
  • 5000 fade false 60 bottom 0 https://www.sualtigazetesi.com/?p=123304
     AtlantikGecisi
  • 5000 fade false 60 bottom 0 https://www.sualtigazetesi.com/?p=123960
     YelkenciTurkiye
  • 5000 fade false 60 bottom 0 https://www.sualtigazetesi.com/?p=123982
     GulinBozkurt
  • 5000 fade false 60 bottom 0 https://www.sualtigazetesi.com/?p=124331
     TheBodrumCup
  • 5000 fade false 60 bottom 0 https://www.sualtigazetesi.com/?p=124350
     DunyaUcuncusu
  • 5000 fade false 60 bottom 0 https://www.sualtigazetesi.com/?p=124603
     DerinBaytur
  • 5000 fade false 60 bottom 0 https://www.sualtigazetesi.com/?p=124808
     TheLastNewsOf52SuperSeries
  • 5000 fade false 60 bottom 0 https://www.sualtigazetesi.com/?p=124833
     ArkasLinlRegatta2019
  • 5000 fade false 60 bottom 0 https://www.sualtigazetesi.com/kusadasi-yat-kulubu-cumhuriyet-yarisi/
     CUMHURIYETYARISI
  • 5000 fade false 60 bottom 0 https://www.sualtigazetesi.com/ali-poyraz-ozdemir-balkan-sampiyonu/
     AliPoyrazOzdemirBalkaSampiyonu
  • 5000 fade false 60 bottom 0 https://www.sualtigazetesi.com/ejder-ginyol%e2%80%99dan-gold-cup%e2%80%99ta-birincilik/
     EjderSampiyon

https://www.sualtigazetesi.com/wp-content/uploads/2015/04/Untitled3.jpg


Bu konu şimdiye kadar 348 kere görüntülenmiştir