{"title":"Sight Glasses","description":"\u003cp\u003eSight spools and the 2 inch windows that go in them, so an operator can watch a column instead of guessing at it.\u003c\/p\u003e\n\u003cul\u003e\n\u003cli\u003eThe 4 inch and 6 inch spools are sold bare, with no sight glass fitted. Budget for the spool, two windows, two 2 inch clamps and two 2 inch gaskets to finish the build.\u003c\/li\u003e\n\u003cli\u003eEvery 6 inch spool comes with a 1\/4 inch bore-through for a thermocouple. The probe is sold separately, in \u003ca href=\"\/collections\/thermocouple-parts\"\u003eThermocouple Parts\u003c\/a\u003e.\u003c\/li\u003e\n\u003cli\u003eBoth 2 inch windows are borosilicate with a stainless frame, certified to 300 psi and -40 to 572 F (-40 to 300 C).\u003c\/li\u003e\n\u003cli\u003eOn a system pulling deep vacuum, the 2 inch sight glass is usually the limiting component, not the vessel. Worth knowing before you size the rest of the stack.\u003c\/li\u003e\n\u003cli\u003eSpools are fabricated in Bend, Oregon in 4 inch and 6 inch. We do not make an 8 inch spool.\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003cp\u003eClamp and gasket pressure ratings are tabulated in \u003ca href=\"\/blogs\/tech\/tri-clamp-pressure-ratings\"\u003eTri Clamp Pressure Ratings\u003c\/a\u003e.\u003c\/p\u003e","products":[{"product_id":"rayotek-2-inch-sanitarytri-clamp-sight-glass-borosilicate-2205-duplex-stainless-steel","title":"Rayotek 2\" Tri-Clamp Sight Glass, Borosilicate \u0026 2205 Duplex","description":"\u003cp\u003eA 2 inch tri clamp sight window, borosilicate fused directly to a 2205 duplex stainless ring. Rayotek part number 101142-001. $449.95 each, and most builds take two.\u003c\/p\u003e\n\n\u003ch2\u003eCertified ratings\u003c\/h2\u003e\n\u003ctable\u003e\u003ctbody\u003e\n\u003ctr\u003e\n\u003ctd\u003ePart number\u003c\/td\u003e\n\u003ctd\u003eRayotek 101142-001\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eConnection\u003c\/td\u003e\n\u003ctd\u003e2 in tri clamp\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eGlass\u003c\/td\u003e\n\u003ctd\u003eBorosilicate, fused to the ring\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eWetted materials\u003c\/td\u003e\n\u003ctd\u003eDuplex stainless and borosilicate\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eMaximum pressure\u003c\/td\u003e\n\u003ctd\u003e300 psi (20.7 bar)\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eMinimum pressure\u003c\/td\u003e\n\u003ctd\u003e-15 psi (-1.0 bar)\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eTemperature\u003c\/td\u003e\n\u003ctd\u003e-40 °F to 572 °F (-40 °C to 300 °C)\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eSource\u003c\/td\u003e\n\u003ctd\u003e3P Certz report ECR-250902-R0, Appendix A\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003ePrice\u003c\/td\u003e\n\u003ctd\u003e$449.95 each, two per sight spool\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eAvailability\u003c\/td\u003e\n\u003ctd\u003eBuilt to order. Contact the shop for lead time\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003c\/tbody\u003e\u003c\/table\u003e\n\u003cp\u003eThose are the figures recorded against this exact part number in our own certification report, not a catalog claim. Three things follow from them.\u003c\/p\u003e\n\u003cul\u003e\n\u003cli\u003e\n\u003cstrong\u003e300 psi (20.7 bar) is the glass. 250 psi (17.2 bar) is the system.\u003c\/strong\u003e An N.B. Oler hydrocarbon system is designed to 250 psi (17.2 bar), and that is what the relief valve is set to. The lowest applicable limit always governs, so do not read 300 psi (20.7 bar) as permission to run a system to 300 psi.\u003c\/li\u003e\n\u003cli\u003e-15 psi (-1.0 bar) is your vacuum limit for the whole assembly. ECR-250902-R0 names the 2 inch sight glass as the limiting component on minimum pressure. Everything else in the system goes deeper.\u003c\/li\u003e\n\u003cli\u003eThe glass is fused to the metal ring rather than clamped against a seal, so there is no gasket inside the window to creep, take a set or be attacked by solvent. You still need a gasket at the tri clamp joint itself.\u003c\/li\u003e\n\u003c\/ul\u003e\n\n\u003ch2\u003eRayotek or MetaClamp\u003c\/h2\u003e\n\u003cp\u003eWe stock both and fit them interchangeably, whichever is on the shelf. This one is built to order at the moment. Our 2 inch MetaClamp window is in stock at the same price if you need one today.\u003c\/p\u003e\n\u003ctable\u003e\u003ctbody\u003e\n\u003ctr\u003e\n\u003ctd\u003e\u003c\/td\u003e\n\u003ctd\u003eRayotek, this page\u003c\/td\u003e\n\u003ctd\u003eMetaClamp\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003ePressure\u003c\/td\u003e\n\u003ctd\u003e300 psi (20.7 bar)\u003c\/td\u003e\n\u003ctd\u003e230 psig (15.9 bar)\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eTemperature\u003c\/td\u003e\n\u003ctd\u003e-40 °F to 572 °F (-40 °C to 300 °C)\u003c\/td\u003e\n\u003ctd\u003e536 °F (280 °C)\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eMinimum pressure\u003c\/td\u003e\n\u003ctd\u003e-15 psi (-1.0 bar)\u003c\/td\u003e\n\u003ctd\u003eNot published\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eNamed by part number in ECR-250902-R0\u003c\/td\u003e\n\u003ctd\u003eYes\u003c\/td\u003e\n\u003ctd\u003eNo\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003ePrice\u003c\/td\u003e\n\u003ctd\u003e$449.95\u003c\/td\u003e\n\u003ctd\u003e$449.95\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003c\/tbody\u003e\u003c\/table\u003e\n\u003cp\u003eIf you are matching existing windows on a system, match what you already have. If you are certifying or recertifying, confirm your choice with your own certifier.\u003c\/p\u003e\n\n\u003ch2\u003eWhat you also need\u003c\/h2\u003e\n\u003cul\u003e\n\u003cli\u003eTwo windows per sight spool, one in each 2 inch port\u003c\/li\u003e\n\u003cli\u003eOne 2 inch gasket per window, Viton or PTFE envelope\u003c\/li\u003e\n\u003cli\u003eOne 2 inch high pressure clamp per window\u003c\/li\u003e\n\u003cli\u003eThe spool itself, 4 inch or 6 inch, if you do not already have one\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003cp\u003eFits our 4 inch and 6 inch sight glass spools, and any standard 2 inch tri clamp port. Nothing in the list above is included.\u003c\/p\u003e\n\n\u003ch2\u003eHandling\u003c\/h2\u003e\n\u003cul\u003e\n\u003cli\u003eInspect before every install. A chipped, cracked or scratched window comes out of service and does not go back in\u003c\/li\u003e\n\u003cli\u003eNever modify, machine or re-face a sight window\u003c\/li\u003e\n\u003cli\u003eClean with a soft cloth and a solvent compatible with borosilicate and 2205. No abrasives, nothing metal on the glass face\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003cp\u003eBuilt to order, shipped from Bend, Oregon.\u003c\/p\u003e","brand":"N.B.Oler","offers":[{"title":"Default Title","offer_id":917377351699,"sku":"RTK-101142-001","price":449.95,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/2134\/5331\/products\/sightglassbottom_061605a4-2d5c-4363-95fa-d2882111c22b.png?v=1528490677"},{"product_id":"sight-spool-precision-monitoring-made-easy-with-thermocouple","title":"6\" Sight Glass Spool, 6\" Tall, Two 2\" Ports and Thermocouple Port","description":"\u003cp\u003eA 6 inch diameter by 6 inch tall 304L stainless spool with two 2 inch sight ports and a 1\/4 inch thermocouple port, built in house in Bend, Oregon. $600.00.\u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003eSight glasses are not included.\u003c\/strong\u003e You are buying the bare spool, with the ports welded in and empty. A complete spool with two windows fitted runs roughly double this price.\u003c\/p\u003e\n\n\u003ch2\u003eWhat is in the box\u003c\/h2\u003e\n\u003cul\u003e\n\u003cli\u003eOne 6 in by 6 in spool, 304L stainless, 0.109 in wall, number 4 polish, 6.567 in across the ferrule\u003c\/li\u003e\n\u003cli\u003eA 6 in tri clamp ferrule on each end\u003c\/li\u003e\n\u003cli\u003eTwo 2 in sight ports on 56 mm ferrules, set at an angle so you look down into the flow rather than straight across it\u003c\/li\u003e\n\u003cli\u003eOne 1\/4 in weld bore through for a thermocouple, fitted on every 6 inch spool we build\u003c\/li\u003e\n\u003cli\u003eMaterials as named in ECR-250902-R0: tube SA-249 TP304, ferrules SA-240 304 plate, bore through SA-479 316. Built to our drawing NB-SP-6-WLD-R1\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003cp\u003eThe thermocouple \u003cstrong\u003eport\u003c\/strong\u003e is included. The probe is not. It is a 1\/4 inch K type, 4 inch length, sold separately.\u003c\/p\u003e\n\n\u003ch2\u003ePressure, temperature and the CRN\u003c\/h2\u003e\n\u003ctable\u003e\u003ctbody\u003e\n\u003ctr\u003e\n\u003ctd\u003eShell envelope, calculated\u003c\/td\u003e\n\u003ctd\u003e-319.7 psi to 764.5 psi (-22.0 bar to 52.7 bar)\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eCalculation basis\u003c\/td\u003e\n\u003ctd\u003eASME UG-27 and UG-28, SA-240 304, S 19.7 ksi, 0.115 in wall, 5.78 in inside diameter, seamless, joint efficiency 1.0\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eSource\u003c\/td\u003e\n\u003ctd\u003e3P Certz report ECR-250902-R0\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eSystem design pressure\u003c\/td\u003e\n\u003ctd\u003e-14.7 psi to 250 psi (-1.0 bar to 17.2 bar), leaving 305 psi (21.0 bar) and 514.5 psi (35.5 bar) of margin\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eFitted with a Rayotek window\u003c\/td\u003e\n\u003ctd\u003e300 psi (20.7 bar)\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eFitted with a MetaClamp window\u003c\/td\u003e\n\u003ctd\u003e232 psi (16 bar), per Metaglas's published ratings\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eVacuum in practice\u003c\/td\u003e\n\u003ctd\u003e-1.0 bar (-15 psi), set by the 2 in sight glass for the whole system. Metaglas publishes -1.0 bar for the MetaClamp and our report puts the Rayotek at -15 psi\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eVessel design temperature\u003c\/td\u003e\n\u003ctd\u003e93 °C (200 °F)\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eSystem operating temperature\u003c\/td\u003e\n\u003ctd\u003e50 °C (122 °F)\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eCanada\u003c\/td\u003e\n\u003ctd\u003eItem 2 on Ontario CRN 0H24152.5, Technical Standards and Safety Authority, as part of our 6 in material column\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003c\/tbody\u003e\u003c\/table\u003e\n\u003cp\u003eThe shell is a real calculation rather than a catalog figure, and it is never the limit. Once windows are in, the glass governs. The lowest applicable limit always governs.\u003c\/p\u003e\n\n\u003ch2\u003eWhat you also need to finish the build\u003c\/h2\u003e\n\u003cul\u003e\n\u003cli\u003eTwo 2 inch sight glasses, Rayotek or MetaClamp, both borosilicate in 2205 duplex\u003c\/li\u003e\n\u003cli\u003eTwo 2 inch gaskets, Viton or PTFE envelope\u003c\/li\u003e\n\u003cli\u003eTwo 2 inch high pressure clamps, to hold the windows in\u003c\/li\u003e\n\u003cli\u003eTwo 6 inch gaskets and two 6 inch high pressure clamps, to put the spool into your column\u003c\/li\u003e\n\u003cli\u003eOne 1\/4 inch K type thermocouple probe, 4 inch, if you want temperature\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003cp\u003eFits any 6 inch tri clamp column or collection vessel. We build a 4 inch version too. There is no 8 inch.\u003c\/p\u003e\n\n\u003ch2\u003eService\u003c\/h2\u003e\n\u003cul\u003e\n\u003cli\u003eInspect the windows every time the spool is apart, and replace any that are chipped, cracked or scratched rather than running them\u003c\/li\u003e\n\u003cli\u003eGaskets are consumable. Keep spares for both the 2 inch and the 6 inch joints\u003c\/li\u003e\n\u003cli\u003eOur operators manual has you observe the oil through the sight glasses before opening a collection valve, and this is the part that makes that possible\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003cp\u003eBuilt in house in Bend, Oregon.\u003c\/p\u003e","brand":"N.B.Oler","offers":[{"title":"Default Title","offer_id":31335052148793,"sku":"NB-SPL-SIGHT-06IN","price":600.0,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/2134\/5331\/products\/6inSightSpoolWeldment7_Beauty.png?v=1684275070"},{"product_id":"sight-spool-with-optimal-k-type-thermocouple-monitoring","title":"4\" Sight Glass Spool, 6\" Tall, Two 2\" Ports and Thermocouple Port","description":"\u003cp\u003eA 4 inch diameter by 6 inch tall 304L stainless spool with two 2 inch sight ports and a 1\/4 inch thermocouple port, built in house in Bend, Oregon. $300.00.\u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003eSight glasses are not included.\u003c\/strong\u003e You are buying the bare spool, with the ports welded in and empty. A pair of windows adds about $900.\u003c\/p\u003e\n\n\u003ch2\u003eWhat is in the box\u003c\/h2\u003e\n\u003cul\u003e\n\u003cli\u003eOne 4 in by 6 in spool, 304L stainless, 0.085 in wall, number 4 polish, 4.685 in across the ferrule\u003c\/li\u003e\n\u003cli\u003eA 4 in tri clamp ferrule on each end\u003c\/li\u003e\n\u003cli\u003eTwo 2 in sight ports on 56 mm ferrules, set at an angle so you look down into the flow rather than straight across it\u003c\/li\u003e\n\u003cli\u003eOne 1\/4 in weld bore through for a thermocouple, plus a 1\/4 in plug for it, so the spool runs sealed out of the box\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003cp\u003eThe thermocouple probe is not included. It is a 1\/4 inch K type, 4 inch length, sold separately. It drops into a 4 inch column and lets you watch the run: color, consistency, volume, whether solvent is still flashing off.\u003c\/p\u003e\n\n\u003ch2\u003ePressure and temperature\u003c\/h2\u003e\n\u003ctable\u003e\u003ctbody\u003e\n\u003ctr\u003e\n\u003ctd\u003eBare shell\u003c\/td\u003e\n\u003ctd\u003e304L stainless, 0.085 in wall. Not the limit in your system\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eFitted with a Rayotek window\u003c\/td\u003e\n\u003ctd\u003e300 psi (20.7 bar)\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eFitted with a MetaClamp window\u003c\/td\u003e\n\u003ctd\u003e232 psi (16 bar), per Metaglas's published ratings\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eVacuum\u003c\/td\u003e\n\u003ctd\u003e-1.0 bar (-15 psi), set by the 2 in sight glass for the whole system. Metaglas publishes -1.0 bar for the MetaClamp and our report puts the Rayotek at -15 psi\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eSystem design pressure\u003c\/td\u003e\n\u003ctd\u003e250 psi (17.2 bar) on an N.B. Oler hydrocarbon system\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eVessel design temperature\u003c\/td\u003e\n\u003ctd\u003e93 °C (200 °F)\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eSystem operating temperature\u003c\/td\u003e\n\u003ctd\u003e50 °C (122 °F)\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003c\/tbody\u003e\u003c\/table\u003e\n\u003cp\u003eOnce windows are in, the glass governs and not the shell. The lowest applicable limit always governs.\u003c\/p\u003e\n\n\u003ch2\u003eWhat you also need to finish the build\u003c\/h2\u003e\n\u003cul\u003e\n\u003cli\u003eTwo 2 inch sight glasses, Rayotek or MetaClamp, both borosilicate in 2205 duplex\u003c\/li\u003e\n\u003cli\u003eTwo 2 inch gaskets, Viton or PTFE envelope\u003c\/li\u003e\n\u003cli\u003eTwo 2 inch high pressure clamps, to hold the windows in\u003c\/li\u003e\n\u003cli\u003eTwo 4 inch gaskets and two 4 inch clamps, to put the spool into your column\u003c\/li\u003e\n\u003cli\u003eOne 1\/4 inch K type thermocouple probe, 4 inch, if you want temperature. The port ships plugged if you do not\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003cp\u003eWe build a 6 inch version of this spool too, same construction. There is no 3 inch and no 8 inch.\u003c\/p\u003e\n\n\u003ch2\u003eService\u003c\/h2\u003e\n\u003cul\u003e\n\u003cli\u003eInspect the windows every time the spool is apart, and replace any that are chipped, cracked or scratched rather than running them\u003c\/li\u003e\n\u003cli\u003eGaskets are consumable. Keep spares for both the 2 inch and the 4 inch joints\u003c\/li\u003e\n\u003cli\u003eOur operators manual has you observe the oil through the sight glasses before opening a collection valve, and this is the part that makes that possible\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003cp\u003eBuilt in house in Bend, Oregon.\u003c\/p\u003e","brand":"N.B.Oler","offers":[{"title":"Default Title","offer_id":31393033322553,"sku":"NB-SPL-SIGHT-04IN","price":300.0,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/2134\/5331\/products\/4inSightSpoolWeldment4_Beauty.png?v=1684274269"},{"product_id":"2-metaclamp-metaglas-tri-clamp-sight-glass","title":"MetaClamp 2\" Tri-Clamp Sight Glass, Borosilicate \u0026 2205 Duplex","description":"\u003cp\u003eA 2 inch tri clamp sight window, borosilicate glass in a 2205 duplex stainless ring. MetaClamp, by Metaglas. $449.95 each, in stock, and most builds take two.\u003c\/p\u003e\n\n\u003ch2\u003eRatings\u003c\/h2\u003e\n\u003ctable\u003e\u003ctbody\u003e\n\u003ctr\u003e\n\u003ctd\u003eConnection\u003c\/td\u003e\n\u003ctd\u003e2 in sanitary tri clamp\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eGlass\u003c\/td\u003e\n\u003ctd\u003eBorosilicate to DIN 7080\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eRing\u003c\/td\u003e\n\u003ctd\u003eDuplex stainless 1.4462, the European designation for 2205\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eMaximum pressure\u003c\/td\u003e\n\u003ctd\u003e232 psi (16 bar)\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eMinimum pressure\u003c\/td\u003e\n\u003ctd\u003e-14.5 psi (-1.0 bar), which is full vacuum\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eTemperature\u003c\/td\u003e\n\u003ctd\u003e-22 °F to 536 °F (-30 °C to 280 °C)\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eSource\u003c\/td\u003e\n\u003ctd\u003eMetaglas published ratings, MetaClamp Type 80, the 2 in ASME BPE size\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003ePrice\u003c\/td\u003e\n\u003ctd\u003e$449.95 each, two per sight spool\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003c\/tbody\u003e\u003c\/table\u003e\n\u003cp\u003eMetaglas publishes the pressure and the temperature as separate limits rather than a pressure at a temperature, so the 232 psi (16 bar) is not conditional on running hot. The temperature range belongs to the 1.4462 duplex ring, and Metaglas lists a different range for each ring material, so the ring is the part that sets it.\u003c\/p\u003e\n\u003cp\u003eThe ring also runs warmer than the solvent, because its outer face sees room air while its inner face sees process. 3P Certz ran that thermal analysis on a Metaglas window in report ECR-210006-R1 and concluded the ring stays above its minimum with solvent entering at -65 °F (-54 °C). So the cold figure on this table is the ring's own rating, not a solvent temperature.\u003c\/p\u003e\n\n\u003ch2\u003eMetaClamp or Rayotek\u003c\/h2\u003e\n\u003cp\u003eWe stock both and fit both. This one is in stock now.\u003c\/p\u003e\n\u003ctable\u003e\u003ctbody\u003e\n\u003ctr\u003e\n\u003ctd\u003e\u003c\/td\u003e\n\u003ctd\u003eMetaClamp, this page\u003c\/td\u003e\n\u003ctd\u003eRayotek\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eMaximum pressure\u003c\/td\u003e\n\u003ctd\u003e232 psi (16 bar)\u003c\/td\u003e\n\u003ctd\u003e300 psi (20.7 bar)\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eTemperature\u003c\/td\u003e\n\u003ctd\u003e-22 °F to 536 °F (-30 °C to 280 °C)\u003c\/td\u003e\n\u003ctd\u003e-40 °F to 572 °F (-40 °C to 300 °C)\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eMinimum pressure\u003c\/td\u003e\n\u003ctd\u003e-14.5 psi (-1.0 bar)\u003c\/td\u003e\n\u003ctd\u003e-15 psi (-1.0 bar)\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eNamed by part number in ECR-250902-R0\u003c\/td\u003e\n\u003ctd\u003eNo\u003c\/td\u003e\n\u003ctd\u003eYes\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003ePrice\u003c\/td\u003e\n\u003ctd\u003e$449.95\u003c\/td\u003e\n\u003ctd\u003e$449.95\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003c\/tbody\u003e\u003c\/table\u003e\n\u003cp\u003eOur hydrocarbon systems are designed to 250 psi (17.2 bar). At 232 psi (16 bar) this window is the governing limit on such a system and the relief valve should be set to suit. If you want a published rating that clears 250 psi (17.2 bar) outright, use the Rayotek.\u003c\/p\u003e\n\u003cp\u003eIf you are certifying, recertifying or matching an as built document, confirm your window choice with your own certifier. That is worth doing whichever one you pick.\u003c\/p\u003e\n\u003cp\u003eOn vacuum, the 2 inch sight glass is the component that limits minimum pressure for the whole assembly. Metaglas publishes -1.0 bar (-14.5 psi) for this window, which is full vacuum, and our report puts the Rayotek at -15 psi (-1.0 bar). Either way the 2 inch window is the figure to design a vacuum step around.\u003c\/p\u003e\n\n\u003ch2\u003eWhat you also need\u003c\/h2\u003e\n\u003cul\u003e\n\u003cli\u003eTwo windows per sight spool, one in each 2 inch port\u003c\/li\u003e\n\u003cli\u003eOne 2 inch gasket per window, Viton or PTFE envelope\u003c\/li\u003e\n\u003cli\u003eOne 2 inch high pressure clamp per window\u003c\/li\u003e\n\u003cli\u003eThe spool itself, 4 inch or 6 inch, if you do not already have one\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003cp\u003eFits our 4 inch and 6 inch sight glass spools, and any standard 2 inch tri clamp port. Nothing in the list above is included.\u003c\/p\u003e\n\n\u003ch2\u003eHandling\u003c\/h2\u003e\n\u003cul\u003e\n\u003cli\u003eInspect before every install. A chipped, cracked or scratched window comes out of service and does not go back in\u003c\/li\u003e\n\u003cli\u003eNever modify, machine or re-face a sight window\u003c\/li\u003e\n\u003cli\u003eClean with a soft cloth and a solvent compatible with borosilicate and 2205. No abrasives, nothing metal on the glass face\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003cp\u003eIn stock in Bend, Oregon.\u003c\/p\u003e","brand":"N.B.Oler","offers":[{"title":"Default Title","offer_id":45630191796423,"sku":"LJS-METACLAMP-200","price":449.95,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/2134\/5331\/products\/Sightglass_c58e97fb-124c-40ae-a50e-31655570f493.png?v=1528490677"}],"url":"https:\/\/www.nboler.com\/collections\/sight-glasses.oembed","provider":"N.B.Oler","version":"1.0","type":"link"}