{"product_id":"r3-offshore-mooring-chain","title":"Grade R3 Offshore Mooring Chain — Stud Link","description":"\u003ch2\u003eGrade R3 Offshore Mooring Chain\u003c\/h2\u003e\n\u003cp\u003eThe entry grade for offshore mooring. Used on marine continental shelf facilities and general offshore mooring where the balance of strength and fatigue life suits a moderate design load.\u003c\/p\u003e\n\u003cp\u003eStud link offshore mooring chain to \u003cstrong\u003eIACS UR W22\u003c\/strong\u003e, grade\n\u003cstrong\u003eR3\u003c\/strong\u003e, in diameters from 50 mm to\n90 mm. Quoted on request.\u003c\/p\u003e\n\n\u003ch3\u003eMechanical properties\u003c\/h3\u003e\n\u003ctable\u003e\n  \u003ctr\u003e\n\u003cth\u003eYield stress, minimum\u003c\/th\u003e\n\u003ctd\u003e410 N\/mm²\u003c\/td\u003e\n\u003c\/tr\u003e\n  \u003ctr\u003e\n\u003cth\u003eTensile strength, minimum\u003c\/th\u003e\n\u003ctd\u003e690 N\/mm²\u003c\/td\u003e\n\u003c\/tr\u003e\n  \u003ctr\u003e\n\u003cth\u003eElongation, minimum\u003c\/th\u003e\n\u003ctd\u003e17%\u003c\/td\u003e\n\u003c\/tr\u003e\n  \u003ctr\u003e\n\u003cth\u003eReduction of area, minimum\u003c\/th\u003e\n\u003ctd\u003e50%\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003c\/table\u003e\n\n\u003ch3\u003eLoads, weight and pitch\u003c\/h3\u003e\n\u003ctable\u003e\n  \u003cthead\u003e\u003ctr\u003e\n\u003cth\u003eDiameter\u003c\/th\u003e\n\u003cth\u003eProof load\u003c\/th\u003e\n\u003cth\u003eBreak load\u003c\/th\u003e\n\u003cth\u003eWeight\u003c\/th\u003e\n\u003cth\u003e5-link pitch\u003c\/th\u003e\n\u003c\/tr\u003e\u003c\/thead\u003e\n  \u003ctbody\u003e\n    \u003ctr\u003e\n\u003ctd\u003e\n\u003cstrong\u003e50 mm\u003c\/strong\u003e (1.97 in)\u003c\/td\u003e\n\u003ctd\u003e1,480 kN\u003cbr\u003e151 t\u003c\/td\u003e\n\u003ctd\u003e\n\u003cstrong\u003e2,230 kN\u003c\/strong\u003e\u003cbr\u003e227 t\u003c\/td\u003e\n\u003ctd\u003e54.8 kg\/m\u003c\/td\u003e\n\u003ctd\u003e1,100–1,128 mm\u003c\/td\u003e\n\u003c\/tr\u003e\n    \u003ctr\u003e\n\u003ctd\u003e\n\u003cstrong\u003e52 mm\u003c\/strong\u003e (2.05 in)\u003c\/td\u003e\n\u003ctd\u003e1,594 kN\u003cbr\u003e163 t\u003c\/td\u003e\n\u003ctd\u003e\n\u003cstrong\u003e2,402 kN\u003c\/strong\u003e\u003cbr\u003e245 t\u003c\/td\u003e\n\u003ctd\u003e59.2 kg\/m\u003c\/td\u003e\n\u003ctd\u003e1,144–1,173 mm\u003c\/td\u003e\n\u003c\/tr\u003e\n    \u003ctr\u003e\n\u003ctd\u003e\n\u003cstrong\u003e54 mm\u003c\/strong\u003e (2.13 in)\u003c\/td\u003e\n\u003ctd\u003e1,712 kN\u003cbr\u003e175 t\u003c\/td\u003e\n\u003ctd\u003e\n\u003cstrong\u003e2,580 kN\u003c\/strong\u003e\u003cbr\u003e263 t\u003c\/td\u003e\n\u003ctd\u003e63.9 kg\/m\u003c\/td\u003e\n\u003ctd\u003e1,188–1,218 mm\u003c\/td\u003e\n\u003c\/tr\u003e\n    \u003ctr\u003e\n\u003ctd\u003e\n\u003cstrong\u003e56 mm\u003c\/strong\u003e (2.20 in)\u003c\/td\u003e\n\u003ctd\u003e1,834 kN\u003cbr\u003e187 t\u003c\/td\u003e\n\u003ctd\u003e\n\u003cstrong\u003e2,764 kN\u003c\/strong\u003e\u003cbr\u003e282 t\u003c\/td\u003e\n\u003ctd\u003e68.7 kg\/m\u003c\/td\u003e\n\u003ctd\u003e1,232–1,263 mm\u003c\/td\u003e\n\u003c\/tr\u003e\n    \u003ctr\u003e\n\u003ctd\u003e\n\u003cstrong\u003e58 mm\u003c\/strong\u003e (2.28 in)\u003c\/td\u003e\n\u003ctd\u003e1,960 kN\u003cbr\u003e200 t\u003c\/td\u003e\n\u003ctd\u003e\n\u003cstrong\u003e2,953 kN\u003c\/strong\u003e\u003cbr\u003e301 t\u003c\/td\u003e\n\u003ctd\u003e73.7 kg\/m\u003c\/td\u003e\n\u003ctd\u003e1,276–1,308 mm\u003c\/td\u003e\n\u003c\/tr\u003e\n    \u003ctr\u003e\n\u003ctd\u003e\n\u003cstrong\u003e60 mm\u003c\/strong\u003e (2.36 in)\u003c\/td\u003e\n\u003ctd\u003e2,089 kN\u003cbr\u003e213 t\u003c\/td\u003e\n\u003ctd\u003e\n\u003cstrong\u003e3,147 kN\u003c\/strong\u003e\u003cbr\u003e321 t\u003c\/td\u003e\n\u003ctd\u003e78.8 kg\/m\u003c\/td\u003e\n\u003ctd\u003e1,320–1,353 mm\u003c\/td\u003e\n\u003c\/tr\u003e\n    \u003ctr\u003e\n\u003ctd\u003e\n\u003cstrong\u003e62 mm\u003c\/strong\u003e (2.44 in)\u003c\/td\u003e\n\u003ctd\u003e2,221 kN\u003cbr\u003e227 t\u003c\/td\u003e\n\u003ctd\u003e\n\u003cstrong\u003e3,347 kN\u003c\/strong\u003e\u003cbr\u003e341 t\u003c\/td\u003e\n\u003ctd\u003e84.2 kg\/m\u003c\/td\u003e\n\u003ctd\u003e1,364–1,398 mm\u003c\/td\u003e\n\u003c\/tr\u003e\n    \u003ctr\u003e\n\u003ctd\u003e\n\u003cstrong\u003e64 mm\u003c\/strong\u003e (2.52 in)\u003c\/td\u003e\n\u003ctd\u003e2,357 kN\u003cbr\u003e240 t\u003c\/td\u003e\n\u003ctd\u003e\n\u003cstrong\u003e3,551 kN\u003c\/strong\u003e\u003cbr\u003e362 t\u003c\/td\u003e\n\u003ctd\u003e89.7 kg\/m\u003c\/td\u003e\n\u003ctd\u003e1,408–1,443 mm\u003c\/td\u003e\n\u003c\/tr\u003e\n    \u003ctr\u003e\n\u003ctd\u003e\n\u003cstrong\u003e66 mm\u003c\/strong\u003e (2.60 in)\u003c\/td\u003e\n\u003ctd\u003e2,496 kN\u003cbr\u003e255 t\u003c\/td\u003e\n\u003ctd\u003e\n\u003cstrong\u003e3,761 kN\u003c\/strong\u003e\u003cbr\u003e384 t\u003c\/td\u003e\n\u003ctd\u003e95.4 kg\/m\u003c\/td\u003e\n\u003ctd\u003e1,452–1,488 mm\u003c\/td\u003e\n\u003c\/tr\u003e\n    \u003ctr\u003e\n\u003ctd\u003e\n\u003cstrong\u003e68 mm\u003c\/strong\u003e (2.68 in)\u003c\/td\u003e\n\u003ctd\u003e2,639 kN\u003cbr\u003e269 t\u003c\/td\u003e\n\u003ctd\u003e\n\u003cstrong\u003e3,976 kN\u003c\/strong\u003e\u003cbr\u003e406 t\u003c\/td\u003e\n\u003ctd\u003e101.3 kg\/m\u003c\/td\u003e\n\u003ctd\u003e1,496–1,533 mm\u003c\/td\u003e\n\u003c\/tr\u003e\n    \u003ctr\u003e\n\u003ctd\u003e\n\u003cstrong\u003e70 mm\u003c\/strong\u003e (2.76 in)\u003c\/td\u003e\n\u003ctd\u003e2,785 kN\u003cbr\u003e284 t\u003c\/td\u003e\n\u003ctd\u003e\n\u003cstrong\u003e4,196 kN\u003c\/strong\u003e\u003cbr\u003e428 t\u003c\/td\u003e\n\u003ctd\u003e107.3 kg\/m\u003c\/td\u003e\n\u003ctd\u003e1,540–1,579 mm\u003c\/td\u003e\n\u003c\/tr\u003e\n    \u003ctr\u003e\n\u003ctd\u003e\n\u003cstrong\u003e73 mm\u003c\/strong\u003e (2.87 in)\u003c\/td\u003e\n\u003ctd\u003e3,010 kN\u003cbr\u003e307 t\u003c\/td\u003e\n\u003ctd\u003e\n\u003cstrong\u003e4,535 kN\u003c\/strong\u003e\u003cbr\u003e462 t\u003c\/td\u003e\n\u003ctd\u003e116.7 kg\/m\u003c\/td\u003e\n\u003ctd\u003e1,606–1,646 mm\u003c\/td\u003e\n\u003c\/tr\u003e\n    \u003ctr\u003e\n\u003ctd\u003e\n\u003cstrong\u003e76 mm\u003c\/strong\u003e (2.99 in)\u003c\/td\u003e\n\u003ctd\u003e3,242 kN\u003cbr\u003e331 t\u003c\/td\u003e\n\u003ctd\u003e\n\u003cstrong\u003e4,884 kN\u003c\/strong\u003e\u003cbr\u003e498 t\u003c\/td\u003e\n\u003ctd\u003e126.5 kg\/m\u003c\/td\u003e\n\u003ctd\u003e1,672–1,714 mm\u003c\/td\u003e\n\u003c\/tr\u003e\n    \u003ctr\u003e\n\u003ctd\u003e\n\u003cstrong\u003e78 mm\u003c\/strong\u003e (3.07 in)\u003c\/td\u003e\n\u003ctd\u003e3,400 kN\u003cbr\u003e347 t\u003c\/td\u003e\n\u003ctd\u003e\n\u003cstrong\u003e5,123 kN\u003c\/strong\u003e\u003cbr\u003e522 t\u003c\/td\u003e\n\u003ctd\u003e133.2 kg\/m\u003c\/td\u003e\n\u003ctd\u003e1,716–1,759 mm\u003c\/td\u003e\n\u003c\/tr\u003e\n    \u003ctr\u003e\n\u003ctd\u003e\n\u003cstrong\u003e84 mm\u003c\/strong\u003e (3.31 in)\u003c\/td\u003e\n\u003ctd\u003e3,893 kN\u003cbr\u003e397 t\u003c\/td\u003e\n\u003ctd\u003e\n\u003cstrong\u003e5,866 kN\u003c\/strong\u003e\u003cbr\u003e598 t\u003c\/td\u003e\n\u003ctd\u003e154.5 kg\/m\u003c\/td\u003e\n\u003ctd\u003e1,848–1,894 mm\u003c\/td\u003e\n\u003c\/tr\u003e\n    \u003ctr\u003e\n\u003ctd\u003e\n\u003cstrong\u003e87 mm\u003c\/strong\u003e (3.43 in)\u003c\/td\u003e\n\u003ctd\u003e4,149 kN\u003cbr\u003e423 t\u003c\/td\u003e\n\u003ctd\u003e\n\u003cstrong\u003e6,252 kN\u003c\/strong\u003e\u003cbr\u003e638 t\u003c\/td\u003e\n\u003ctd\u003e165.8 kg\/m\u003c\/td\u003e\n\u003ctd\u003e1,914–1,962 mm\u003c\/td\u003e\n\u003c\/tr\u003e\n    \u003ctr\u003e\n\u003ctd\u003e\n\u003cstrong\u003e90 mm\u003c\/strong\u003e (3.54 in)\u003c\/td\u003e\n\u003ctd\u003e4,412 kN\u003cbr\u003e450 t\u003c\/td\u003e\n\u003ctd\u003e\n\u003cstrong\u003e6,647 kN\u003c\/strong\u003e\u003cbr\u003e678 t\u003c\/td\u003e\n\u003ctd\u003e177.4 kg\/m\u003c\/td\u003e\n\u003ctd\u003e1,980–2,030 mm\u003c\/td\u003e\n\u003c\/tr\u003e\n  \u003c\/tbody\u003e\n\u003c\/table\u003e\n\u003cp\u003e\u003cem\u003eProof and break loads calculated from the IACS UR W22 formulas. Tonnes\nare metric tonnes-force, given for comparison — the specification works in\nkN.\u003c\/em\u003e\u003c\/p\u003e\n\n\u003ch3\u003eAny diameter, not just the ones listed\u003c\/h3\u003e\n\u003cp\u003eW22 does not publish a load table — it publishes formulas, so the figures\nabove are calculated rather than looked up and we can quote a diameter that is\nnot on the list. For \u003cstrong\u003eR3 stud link\u003c\/strong\u003e, with \u003cem\u003ed\u003c\/em\u003e in\nmillimetres and the result in kN:\u003c\/p\u003e\n\u003ctable\u003e\n  \u003ctr\u003e\n\u003cth\u003eProof load\u003c\/th\u003e\n\u003ctd\u003e0.0148 × d² × (44 − 0.08d)\u003c\/td\u003e\n\u003c\/tr\u003e\n  \u003ctr\u003e\n\u003cth\u003eBreak load\u003c\/th\u003e\n\u003ctd\u003e0.0223 × d² × (44 − 0.08d)\u003c\/td\u003e\n\u003c\/tr\u003e\n  \u003ctr\u003e\n\u003cth\u003eWeight, stud link\u003c\/th\u003e\n\u003ctd\u003e0.0219 × d² kg\/m\u003c\/td\u003e\n\u003c\/tr\u003e\n  \u003ctr\u003e\n\u003cth\u003eFive link pitch\u003c\/th\u003e\n\u003ctd\u003e22d minimum, 22.55d maximum\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003c\/table\u003e\n\u003cp\u003eStudless chain is available in every grade. Its break loads are identical to\nstud link; the proof loads are lower above R3, and weight is calculated per\ndesign and submitted to class. Studless is normally deployed once, for permanent\nmoorings with a predetermined design life (W22 §1.1.3).\u003c\/p\u003e\n\n\u003ch3\u003eAccessories — do not substitute anchor chain parts\u003c\/h3\u003e\n\u003cp\u003eW22 covers the mooring accessories as well as the chain: common stud and\nstudless links, connecting common links, enlarged links, end links, detachable\nconnecting links, end shackles, subsea connectors, swivels and swivel shackles.\nKenter shackles are covered too, with their own machining requirement — the\nfillet radius must be at least 3 percent of nominal diameter (§3.1.3).\u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003eThey are made to the R grade, and they are not interchangeable with\nanchor chain accessories.\u003c\/strong\u003e W22 §1.2.3 is explicit that each grade is\napproved individually and that approval for a higher grade does not constitute\napproval of a lower one, and §1.6.1 requires the forge or foundry supplying\naccessories to be separately approved by the Classification Society. A Grade 3\nKenter made for anchor chain is not an R4 mooring Kenter, whatever the diameter\nsays.\u003c\/p\u003e\n\u003cp\u003eLooking for ship's anchor chain rather than offshore mooring? That is\nGrade 1\/2\/3 to IACS UR A1 — see\n\u003ca href=\"\/collections\/stud-link-anchor-chain\"\u003estud link anchor chain\u003c\/a\u003e and the\n\u003ca href=\"\/collections\/lr-kenter-shackles\"\u003eKenter joining shackles\u003c\/a\u003e that go\nwith it.\u003c\/p\u003e\n\n\u003ch3\u003eORQ — the name this used to have\u003c\/h3\u003e\n\u003cp\u003e\u003cstrong\u003eORQ, \"Oil Rig Quality\"\u003c\/strong\u003e, is the older name for offshore\nmooring chain, from before IACS formalised the R grades. It still turns up\nconstantly in enquiries, drawings and rig inventories, and it sits at the bottom\nof the modern range — broadly where \u003cstrong\u003eR3\u003c\/strong\u003e is now.\u003c\/p\u003e\n\u003cp\u003eIf your specification, your rig drawing or your old certificate says ORQ, we\ncan quote it. See \u003ca href=\"\/pages\/orq-and-oversize-mooring-chain\"\u003eORQ and\noversize mooring chain\u003c\/a\u003e.\u003c\/p\u003e\n\n\u003ch3\u003eLarger than 90 mm\u003c\/h3\u003e\n\u003cp\u003eThe sizes listed match the diameters we carry across the rest of the range,\nso every chain size has a \u003ca href=\"\/collections\/lr-kenter-shackles\"\u003eKenter\njoining shackle\u003c\/a\u003e to pair with it. \u003cstrong\u003eAbove 90 mm the chain is made to\norder\u003c\/strong\u003e — W22's own tolerance bands run to 222 mm and the formulas above\nhold the whole way, so we can quote any diameter exactly.\n\u003ca href=\"\/pages\/orq-and-oversize-mooring-chain\"\u003eTell us what you need\u003c\/a\u003e.\u003c\/p\u003e\n\n\u003ch3\u003eCertification\u003c\/h3\u003e\n\u003cp\u003eSupplied with Classification Society certification. Chain is manufactured in\ncontinuous lengths by flash butt welding and heat treated in a continuous\nfurnace — batch heat treatment is not permitted (§3.2.1.1). Link shape and\nproportion conform to \u003cstrong\u003eISO 1704\u003c\/strong\u003e or a specially approved design.\u003c\/p\u003e\n\u003cp\u003eTell us the grade, the diameter, the length and the society, and we will quote\nit delivered.\u003c\/p\u003e","brand":"Dibblee","offers":[{"title":"50 mm — break 2,230 kN (227 t)","offer_id":50201026461973,"sku":null,"price":0.0,"currency_code":"USD","in_stock":true},{"title":"52 mm — break 2,402 kN (245 t)","offer_id":50201026494741,"sku":null,"price":0.0,"currency_code":"USD","in_stock":true},{"title":"54 mm — break 2,580 kN (263 t)","offer_id":50201026527509,"sku":null,"price":0.0,"currency_code":"USD","in_stock":true},{"title":"56 mm — break 2,764 kN (282 t)","offer_id":50201026560277,"sku":null,"price":0.0,"currency_code":"USD","in_stock":true},{"title":"58 mm — break 2,953 kN (301 t)","offer_id":50201026593045,"sku":null,"price":0.0,"currency_code":"USD","in_stock":true},{"title":"60 mm — break 3,147 kN (321 t)","offer_id":50201026625813,"sku":null,"price":0.0,"currency_code":"USD","in_stock":true},{"title":"62 mm — break 3,347 kN (341 t)","offer_id":50201026658581,"sku":null,"price":0.0,"currency_code":"USD","in_stock":true},{"title":"64 mm — break 3,551 kN (362 t)","offer_id":50201026691349,"sku":null,"price":0.0,"currency_code":"USD","in_stock":true},{"title":"66 mm — break 3,761 kN (384 t)","offer_id":50201026724117,"sku":null,"price":0.0,"currency_code":"USD","in_stock":true},{"title":"68 mm — break 3,976 kN (406 t)","offer_id":50201026756885,"sku":null,"price":0.0,"currency_code":"USD","in_stock":true},{"title":"70 mm — break 4,196 kN (428 t)","offer_id":50201026789653,"sku":null,"price":0.0,"currency_code":"USD","in_stock":true},{"title":"73 mm — break 4,535 kN (462 t)","offer_id":50201026822421,"sku":null,"price":0.0,"currency_code":"USD","in_stock":true},{"title":"76 mm — break 4,884 kN (498 t)","offer_id":50201026855189,"sku":null,"price":0.0,"currency_code":"USD","in_stock":true},{"title":"78 mm — break 5,123 kN (522 t)","offer_id":50201026887957,"sku":null,"price":0.0,"currency_code":"USD","in_stock":true},{"title":"84 mm — break 5,866 kN (598 t)","offer_id":50201026920725,"sku":null,"price":0.0,"currency_code":"USD","in_stock":true},{"title":"87 mm — break 6,252 kN (638 t)","offer_id":50201026953493,"sku":null,"price":0.0,"currency_code":"USD","in_stock":true},{"title":"90 mm — break 6,647 kN (678 t)","offer_id":50201026986261,"sku":null,"price":0.0,"currency_code":"USD","in_stock":true}],"url":"https:\/\/www.kentershackle.com\/products\/r3-offshore-mooring-chain","provider":"Kenter Shackles","version":"1.0","type":"link"}