Spectacle+Blind+Flange+ASME+B16.48

%3Cp%3E+%3Cspan+style%3D%22font-size%3A14px%3B%22%3E%3Cstrong%3ESpectacle+Blind+Flange+ASME+B16.5.+%3C%2Fstrong%3E%3C%2Fspan%3E%3Cspan+style%3D%22font-size%3A14px%3B%22%3EWe+supply+high+quality+%3C%2Fspan%3E%3Cspan+style%3D%22font-size%3A14px%3B%22%3Espec+blind+flange+RF+%2C+8+blind+flange+%2C+%3C%2Fspan%3E%3Cspan+style%3D%22font-size%3A14px%3B%22%3ESpacer+%26+Spade%3C%2Fspan%3E%3Cspan+style%3D%22font-size%3A14px%3B%22%3E+%2C+Forged+LTCS+Spade+%2Cspec+blind+flange+150%23%3C%2Fspan%3E%3Cspan+style%3D%22font-size%3A14px%3B%22%3E+%2C+Carbon+steel+forged+figure+8+flanges+%2C+%3C%2Fspan%3E%3Cspan+style%3D%22font-size%3A14px%3B%22%3EASME+B16.48+Spectacle+blinds+in+all+dimensions+and+ratings+%2C+%3C%2Fspan%3E%3Cspan+style%3D%22font-size%3A14px%3B%22%3EA105N+Spectacle+Blank+.+Figure+8+flange+standard+is+ASME+B16.48+%2C+if+you+require+any+of+them+%2C+please+contact+us+freely+%2C+we+%3C%2Fspan%3E%3Cspan+style%3D%22font-size%3A14px%3B%22%3Ealso+manufacture+according+to+the+drawings+.+%3C%2Fspan%3E+%3C%2Fp%3E+%3Cbr+%2F%3E+%3Cbr+%2F%3E+%3Cp%3E+%3Cspan+style%3D%22font-size%3A14px%3B%22%3E%3Cbr+%2F%3E+%3C%2Fspan%3E+%3C%2Fp%3E+%3Cp%3E+%3Cspan+style%3D%22font-size%3A14px%3B%22%3E+%3C%2Fspan%3E+%3C%2Fp%3E+%3Cp+class%3D%22MsoNormal%22%3E+%3Cspan+style%3D%22font-size%3A16px%3B%22%3EA+Spectacle+Blind+Flange+or+spec+blind%2C+spectacle+blank%2C+Spacer+%26+Spade+%2C+is+a+safety+device+used+to+isolate+a+section+of+line+or+piece+of+equipment+when+the+line+or+equipment+needs+to+be+inspected+or+removed+from+service.+It+is+different+than+a+valve+in+that+the+blind+is+a+permanent+or+long+term+isolation+device.%3C%2Fspan%3E+%3C%2Fp%3E+%3Cp+class%3D%22MsoNormal%22%3E+%3Cspan+style%3D%22font-size%3A16px%3B%22%3E%3Cimg+src%3D%22%25oss_domain%25product%2Ffa%2F37%2F92%2Ffd5ffc31952fd090b798a12774.jpg%40watermark%3D2%26color%3DI0ZGRkZGRg%253D%253D%26type%3DZHJvaWRzYW5zZmFsbGJhY2s%253D%26size%3D20%26p%3D9%26t%3D80%26text%3DYmRwaXBlZml0dGluZy5ib3NzZ29vLmNvbQ%253D%253D%22+title%3D%22201685729553980838%22+alt%3D%22201685729553980838%22+%2F%3E%3Cbr+%2F%3E+%3C%2Fspan%3E+%3C%2Fp%3E+%3Cp+class%3D%22MsoNormal%22%3E+%3Cspan+style%3D%22font-size%3A16px%3B%22%3E%3Cbr+%2F%3E+%3C%2Fspan%3E+%3C%2Fp%3E+%3Cp+class%3D%22MsoNormal%22%3E+%3Cspan+style%3D%22font-size%3A16px%3B%22%3E+%3C%2Fspan%3E+%3C%2Fp%3E+%3Cp+class%3D%22MsoNormal%22%3E+%3Cspan+style%3D%22font-size%3A16px%3B%22%3E+%3C%2Fspan%3E+%3C%2Fp%3E+%3Cp+style%3D%22color%3A%23444444%3Bfont-family%3AOpen+Sans%3Bfont-size%3A16px%3Bbackground-color%3A%23FFFFFF%3B%22%3E+%3Cspan+style%3D%22color%3A%23000000%3B%22%3EAn+%278+blind%27+or+a+%27spectacle+blind%27+is+a+piping+fitting+that+is+used+for+providing+positive+isolation.+It+consists+of+a+pair+of+metal+discs+attached+to+each+other+as+shown+in+the+figure.%3C%2Fspan%3E+%3C%2Fp%3E+%3Cdiv+class%3D%22code-block+code-block-5%22+style%3D%22color%3A%23444444%3Bfont-family%3AOpen+Sans%3Bfont-size%3A16px%3Bbackground-color%3A%23FFFFFF%3Bmargin%3A8px+0px%3B%22%3E+%3C%2Fdiv%3E+%3Cp+style%3D%22color%3A%23444444%3Bfont-family%3AOpen+Sans%3Bfont-size%3A16px%3Bbackground-color%3A%23FFFFFF%3B%22%3E+%3Cspan+style%3D%22color%3A%23000000%3B%22%3EThese+metal+discs+are+cut+to+fit+between+two+pipe+flanges+and+usually+sandwiched+between+two+gaskets.+One+of+the+metal+discs+is+solid+and+is+used+for+blinding+or+isolating+the+pipe%2C+during+maintenance.+The+other+metal+disc+has+a+circular+hole+to+match+the+pipe+internal+diameter%2C+as+shown+in+the+figure.+The+function+of+this+disc+is+to+allow+the+flow+through+the+pipe+during+normal+operation.%3C%2Fspan%3E+%3C%2Fp%3E+%3Cp+style%3D%22color%3A%23444444%3Bfont-family%3AOpen+Sans%3Bfont-size%3A16px%3Bbackground-color%3A%23FFFFFF%3B%22%3E+%3Cspan+style%3D%22color%3A%23000000%3B%22%3ETwo+discs+are+attached+to+each+other+using+a+metal+piece+with+a+small+hole+in+it+which+can+be+used+for+rotating+the+8+blind+%2F+spectacle+blind.+So+during+normal+operation+the+solid+disc+is+outside+the+pipe+and+hollow+disc+allows+the+flow+through+the+pipe.+During+maintenance+this+8+blind+is+rotated+so+that+the+hollow+disc+is+outside+the+pipe+while+solid+disc+blocks+or+isolates+the+fluid+flow+on+one+side+of+the+pipe.%3C%2Fspan%3E+%3C%2Fp%3E+%3Cp+style%3D%22color%3A%23444444%3Bfont-family%3AOpen+Sans%3Bfont-size%3A16px%3Bbackground-color%3A%23FFFFFF%3B%22%3E+%3Cspan+style%3D%22color%3A%23000000%3B%22%3EThe+name+spectacle+blind+comes+from+the+spectacle+like+appearance+of+the+device+and+the+name+8+blind+originates+from+the+two+circular+discs+used+to+make+the+device.+They+are+generally+installed+as+a+permanent+device+to+separate+process+piping+systems.%3C%2Fspan%3E+%3C%2Fp%3E+%3Cp+style%3D%22color%3A%23444444%3Bfont-family%3AOpen+Sans%3Bfont-size%3A16px%3Bbackground-color%3A%23FFFFFF%3B%22%3E+%3Cspan+style%3D%22color%3A%23000000%3B%22%3E%3Cbr+%2F%3E+%3C%2Fspan%3E+%3C%2Fp%3E+%3Cdiv+class%3D%22code-block+code-block-8%22+style%3D%22color%3A%23444444%3Bfont-family%3AOpen+Sans%3Bfont-size%3A16px%3Bbackground-color%3A%23FFFFFF%3Bmargin%3A8px+0px%3B%22%3E+%3C%2Fdiv%3E+%3Cp+style%3D%22color%3A%23444444%3Bfont-family%3AOpen+Sans%3Bfont-size%3A16px%3Bbackground-color%3A%23FFFFFF%3B%22%3E+%3Cspan+style%3D%22color%3A%23000000%3B%22%3EThey+are+often+used+along+with+block+and+bleed+valve+assemblies+meant+to+provide+positive+isolation+for+maintenance+on+the+process+facilities.+After+that+block+and+bleed+valve+is+closed+and+equipment+is+depressurized+and+drained%2C+the+8+blind+%2F+spectacle+blind+can+be+rotated+into+close+position+to+provide+additional+isolation+from+process+fluids+entering+the+maintenance+area.%3C%2Fspan%3E+%3C%2Fp%3E+%3Cp+style%3D%22color%3A%23444444%3Bfont-family%3AOpen+Sans%3Bfont-size%3A16px%3Bbackground-color%3A%23FFFFFF%3B%22%3E+%3Cspan+style%3D%22color%3A%23000000%3B%22%3EThe+whole+idea+of+a+spectacle+blind+is+so+that+one+can+be+absolutely+sure+that+an+item+of+equipment+is+properly+and+securely+blanked+off+with+no+possibility+of+any+flow+or+leakage+through+a+valve+during+maintenance.%3C%2Fspan%3E+%3C%2Fp%3E+%3Cp+style%3D%22color%3A%23444444%3Bfont-family%3AOpen+Sans%3Bfont-size%3A16px%3Bbackground-color%3A%23FFFFFF%3B%22%3E+%3Cspan+style%3D%22color%3A%23000000%3B%22%3EThe+flow+can+be+diverted+to+other+items+of+equipment+but+not+just+bypassed+around+the+blank+as+this+would+compromise+the+safety+function+of+the+spectacle+blind.+The+flow+has+to+valved+off+and+pressure+relieved+prior+to+loosening+flange+bolts+and+swinging+the+blind.%3C%2Fspan%3E+%3C%2Fp%3E+%3Cp%3E+%3Cbr+%2F%3E+%3C%2Fp%3E+%3Cp+class%3D%22MsoNormal%22%3E+%3Cspan+style%3D%22font-size%3A16px%3B%22%3E+%3C%2Fspan%3E+%3C%2Fp%3E+%3Cp+class%3D%22MsoNormal%22%3E+%3Cspan+style%3D%22font-size%3A16px%3B%22%3EThe+specification+that+determines+the+dimensions+of+a+spectacle+blinds+is+ASME+B16.48+-+Line+Blanks.+A+line+blank+conforming+to+this+standard+will+be+marked+in+the+following+way%3A%3C%2Fspan%3E+%3C%2Fp%3E+%3Cp+class%3D%22MsoNormal%22%3E+%3Cspan+style%3D%22font-size%3A16px%3B%22%3E+%3C%2Fspan%3E+%3C%2Fp%3E+%3Cp+class%3D%22MsoNormal%22%3E+%3Cspan+style%3D%22font-size%3A16px%3B%22%3ENominal+Pipe+Size+%28NPS%29%3C%2Fspan%3E+%3C%2Fp%3E+%3Cp+class%3D%22MsoNormal%22%3E+%3Cspan+style%3D%22font-size%3A16px%3B%22%3ENominal+Pressure+Class%3C%2Fspan%3E+%3C%2Fp%3E+%3Cp+class%3D%22MsoNormal%22%3E+%3Cspan+style%3D%22font-size%3A16px%3B%22%3EMaterial%3C%2Fspan%3E+%3C%2Fp%3E+%3Cp+class%3D%22MsoNormal%22%3E+%3Cspan+style%3D%22font-size%3A16px%3B%22%3EManufacturer%27s+Name%3C%2Fspan%3E+%3C%2Fp%3E+%3Cp+class%3D%22MsoNormal%22%3E+%3Cspan+style%3D%22font-size%3A16px%3B%22%3EIf+RTJ%2C+the+ring+number%3C%2Fspan%3E+%3C%2Fp%3E+%3Cp+class%3D%22MsoNormal%22%3E+%3Cspan+style%3D%22font-size%3A16px%3B%22%3EOne+end+of+the+blind+will+have+an+opening+to+allow+flow+through+the+pipe+during+operation+and+the+other+end+is+solid+to+block+flow+during+maintenance%3C%2Fspan%3E+%3C%2Fp%3E+%3Cp+class%3D%22MsoNormal%22%3E+%3Cspan+style%3D%22font-size%3A16px%3B%22%3E+%3C%2Fspan%3E+%3C%2Fp%3E+%3Cp+class%3D%22MsoNormal%22%3E+%3Cspan+style%3D%22font-size%3A16px%3B%22%3E%3Cstrong%3E%3Cspan+style%3D%22font-size%3A14px%3B%22%3EOther+Material+of+Spectacle+Blind+Flange+We+could+offer+%3A+%3C%2Fspan%3E%3C%2Fstrong%3E%3Cbr+%2F%3E+%3Cbr+%2F%3E+%3Cspan+style%3D%22font-size%3A14px%3B%22%3ECarbon+Steel%3A+ASTM%3A+SA105N%2FA105%2C+ASTM+SA350+LF2%2Cetc%3C%2Fspan%3E%3Cbr+%2F%3E+%3Cbr+%2F%3E+%3Cspan+style%3D%22font-size%3A14px%3B%22%3EStainless+Steel%3A+ASTM+A182+F304%2F304L%2F316%2F316L%2C+etc%3C%2Fspan%3E%3Cbr+%2F%3E+%3Cbr+%2F%3E+%3C%2Fspan%3E+%3C%2Fp%3E+%3Cp%3E+%3Cspan+style%3D%22font-size%3A14px%3B%22%3EAlloy+Steel%3A+ASTM+A182+F1%2FF5%2FF9%2FF11%2FF22%2FF91%2C+Etc.%3C%2Fspan%3E+%3C%2Fp%3E+%3Cp%3E+%3Cspan+style%3D%22font-size%3A14px%3B%22%3E%3Cbr+%2F%3E+%3C%2Fspan%3E+%3C%2Fp%3E+%3Cp%3E+%3Cspan+style%3D%22font-size%3A14px%3B%22%3E%22What+is+the+difference+between+a+spectacle+blind+and+a+paddle+blind+or+spade+blind%3F%22+%3Cbr+%2F%3E+%3Cbr+%2F%3E+Answer%3A%3Cbr+%2F%3E+%3Cbr+%2F%3E+Spectacle+Blind%3A%3Cbr+%2F%3E+A+spectacle+blind+-+also+known+as+a+figure-8+blind+-+is+generally+a+piece+of+metal+that+is+cut+to+fit+between+two+pipe+flanges+and+usually+sandwiched+between+two+gaskets.+A+spectacle+blind+is+often+made+from+two+metal+discs+that+are+attached+to+each+other+by+a+small+section+of+steel.+The+shape+is+similar+to+a+pair+of+glasses+or+%22spectacles%22+%E2%80%93+hence+the+name+spectacle+blind.+One+end+of+the+blind+will+have+an+opening+to+allow+flow+through+the+pipe+during+operation+and+the+other+end+is+solid+to+block+flow+during+maintenance.+They+are+generally+installed+as+a+permanent+device+to+separate+process+piping+systems.%3Cbr+%2F%3E+%3Cbr+%2F%3E+Paddle+Blind%3A%3Cbr+%2F%3E+A+paddle+blind+-+also+known+as+spade+blind%2C+skillet+blind%2C+line+blind%2C+pancake+blind%2C+or+slip+blind+-+is+basically+the+solid+half+of+a+spectacle+blind.+A+paddle+blind+is+often+made+from+one+solid+metal+disc+and+will+usually+have+a+thin+length+of+metal+attached+to+one+end+to+be+used+as+a+handle.+A+finished+assembly+will+resemble+the+shape+of+a+paddle%2C+hence+the+name+%22paddle+blind%22.+Generally%2C+these+types+of+blinds+are+applied+in+piping+systems+that+do+not+require+constant+maintenance.+The+paddle+blind+is+used+more+as+a+temporary+blocking+device+to+stop+flow+in+a+process+piping+system.+Optional+paddle+type+spacers+can+be+used+in-line+when+returning+the+system+to+operation.%3Cbr+%2F%3E+%3Cbr+%2F%3E+Other+Differences%3A%3Cbr+%2F%3E+Compared+to+paddle+blinds%2C+spectacle+blinds+often+require+a+larger%2C+more+open+area+to+install%2C+remove%2C+or+change+the+blinds+from+the+open+to+closed+position.+In+contrast%2C+the+paddle+blind+can+be+used+in+tighter+spaces+or+where+access+is+limited.+Spectacle+blinds+are+also+typically+heavier+in+weight+than+the+standard+paddle+blind%2C+which+may+require+rigging+or+lifting+assistance+during+installation+or+removal.+Because+of+this%2C+paddle+blinds+are+more+commonly+used+for+larger+pipe+diameters.%3Cbr+%2F%3E+%3Cbr+%2F%3E+%3Cbr+%2F%3E+%3C%2Fspan%3E+%3C%2Fp%3E+%3Cp%3E+%3Cbr+%2F%3E+%3C%2Fp%3E+%3Cp%3E+%3Cspan+style%3D%22font-size%3A16px%3B%22%3EIf+you+require+any+Pandle+Spacer+%2C+Spacer+%26+Spade+%2C+ASME+B16.48+Spectacle+Blind+Flange+please+call+me+freely+.+%3C%2Fspan%3E+%3C%2Fp%3E+%3Cp%3E+%3Cbr+%2F%3E+%3C%2Fp%3E+%3Cp%3E+%3Cimg+src%3D%22%25oss_domain%25product%2F97%2F2c%2Fce%2Fb6d526c47caf1dd291c994f6c7.jpg%40watermark%3D2%26color%3DI0ZGRkZGRg%253D%253D%26type%3DZHJvaWRzYW5zZmFsbGJhY2s%253D%26size%3D20%26p%3D9%26t%3D80%26text%3DYmRwaXBlZml0dGluZy5ib3NzZ29vLmNvbQ%253D%253D%22+title%3D%22Spectacle+Blind%22+alt%3D%22Spectacle+Blind%22+%2F%3E%3Cimg+src%3D%22%25oss_domain%25product%2F1d%2Fd7%2F69%2F59c33a212fba5190faf60a606a.jpg%40watermark%3D2%26color%3DI0ZGRkZGRg%253D%253D%26type%3DZHJvaWRzYW5zZmFsbGJhY2s%253D%26size%3D20%26p%3D9%26t%3D80%26text%3DYmRwaXBlZml0dGluZy5ib3NzZ29vLmNvbQ%253D%253D%22+title%3D%22Spectacle+Blind%22+alt%3D%22Spectacle+Blind%22+%2F%3E+%3C%2Fp%3E+%3Cp%3E+%3Cimg+src%3D%22%25oss_domain%25product%2Fe1%2Ff0%2F61%2F5065d5457ebfb63ff3b1727979.jpg%40watermark%3D2%26color%3DI0ZGRkZGRg%253D%253D%26type%3DZHJvaWRzYW5zZmFsbGJhY2s%253D%26size%3D20%26p%3D9%26t%3D80%26text%3DYmRwaXBlZml0dGluZy5ib3NzZ29vLmNvbQ%253D%253D%22+title%3D%22Spacer%22+alt%3D%22Spacer%22+%2F%3E%3Cimg+src%3D%22%25oss_domain%25product%2Fb3%2F99%2F42%2F85a44deef5d4ce63cbcdfa6968.jpg%40watermark%3D2%26color%3DI0ZGRkZGRg%253D%253D%26type%3DZHJvaWRzYW5zZmFsbGJhY2s%253D%26size%3D20%26p%3D9%26t%3D80%26text%3DYmRwaXBlZml0dGluZy5ib3NzZ29vLmNvbQ%253D%253D%22+title%3D%22Spacer%22+alt%3D%22Spacer%22+%2F%3E%3Cimg+src%3D%22%25oss_domain%25product%2F57%2Fae%2F29%2Fbf70fcdcd120cd4e23778321f0.jpg%40watermark%3D2%26color%3DI0ZGRkZGRg%253D%253D%26type%3DZHJvaWRzYW5zZmFsbGJhY2s%253D%26size%3D20%26p%3D9%26t%3D80%26text%3DYmRwaXBlZml0dGluZy5ib3NzZ29vLmNvbQ%253D%253D%22+title%3D%22Spacer%22+alt%3D%22Spacer%22+%2F%3E%3Cimg+src%3D%22%25oss_domain%25product%2Fa6%2Fff%2F73%2F2cef6c109a91ba476fac039fce.jpg%40watermark%3D2%26color%3DI0ZGRkZGRg%253D%253D%26type%3DZHJvaWRzYW5zZmFsbGJhY2s%253D%26size%3D20%26p%3D9%26t%3D80%26text%3DYmRwaXBlZml0dGluZy5ib3NzZ29vLmNvbQ%253D%253D%22+title%3D%22Spacer+Spade%22+alt%3D%22Spacer+Spade%22+%2F%3E+%3C%2Fp%3E+%3Cp%3E+%3Cimg+src%3D%22%25oss_domain%25product%2F7f%2F54%2Fd8%2F67c583e41fe5d9093d2a1d2343.jpg%40watermark%3D2%26color%3DI0ZGRkZGRg%253D%253D%26type%3DZHJvaWRzYW5zZmFsbGJhY2s%253D%26size%3D20%26p%3D9%26t%3D80%26text%3DYmRwaXBlZml0dGluZy5ib3NzZ29vLmNvbQ%253D%253D%22+title%3D%22SpecBlind+line+close%22+alt%3D%22SpecBlind+line+close%22+%2F%3E+%3C%2Fp%3E+%3Cdiv%3E+%3Cbr+%2F%3E+%3C%2Fdiv%3E+%3Cdiv%3E+%3Cem%3E%3Cbr+%2F%3E+%3C%2Fem%3E+%3C%2Fdiv%3E

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