Blind Flange

TRIO STEEL IS A LEADING MANUFACTURER, SUPPLIER AND EXPORTER OF Blind Flanges.

We provide a complete and best quality range of Blind Flanges.Blind Flanges are used in constructions, food industry, pharmaceutical industry, petrochemical industry, automotive industry, municipal and decorative purposes. All Blind Flanges are individually covered so that the premium quality of materials is retained and there are no damges in the last stages of production.

Blind Flanges Description

Other Name: BLIND FLANGES, BLRF FLANGES, BLFF FLANGES, BLIND FLANGES RF, B16.5, ASTM A105, BLANK FLANGES

Blind pipe flanges are pipe flanges used to seal the end of a piping system or pressure vessel openings to prevent flow. Blind pipe flanges are commonly used for pressure testing the flow of liquid or gas through a pipe or vessel.

Standard: ANSI, ASME, ASA B16.5
Size: 1/2” – 48”
Material: ASTM A105, CARBON STEEL
Supply Ability: 3000Ton/Month
Process: Forged, Forging
Packing: Plywood Pallets
Payment Terms: T/T, L/C, D/P
BLIND FLANGES, BLANK FLANGES, BLFF FLANGES, BLRF FLANGES, monthly output 3000Ton, material carbon steel & Stainless Steel.

Norms & Types

  1. BLIND FLANGES RF, BLRF FLANGES, BLANK FLANGES, BL FLANGES RAISED FACE, CLASS 150, 150LBS, 150#, 1/2″ – 48″, ASTM A105.
  2. BLIND FLANGES RF, BLRF FLANGES, BLANK FLANGES, BL FLANGES RAISED FACE, CLASS 300, 300LBS, 300#, 1/2″ – 48″, ASTM A105.
  3. BLIND FLANGES RF, BLRF FLANGES, BLANK FLANGES, BL FLANGES RAISED FACE, CLASS 600, 600LBS, 600#, 1/2″ – 48″, ASTM A105.
  4. BLIND FLANGES RF, BLRF FLANGES, BLANK FLANGES, BL FLANGES RAISED FACE, CLASS 900, 900LBS, 900#, 1/2″ – 48″, ASTM A105.
  5. BLIND FLANGES RF, BLRF FLANGES, BLANK FLANGES, BL FLANGES RAISED FACE, CLASS 1500, 1500LBS, 1500#, 1/2″ – 48″, ASTM A105.
  6. BLIND FLANGES RF, BLRF FLANGES, BLANK FLANGES, BL FLANGES RAISED FACE, CLASS 2500, 2500LBS, 2500#, 1/2″ – 48″, ASTM A105.

Material

1) ASTM A105, A105N

Surface Antirust:
Surface antirust 1: Antirust light oil
Surface antirust 2: Black paint coating
Surface antirust 3: Yellow paint coating or Red paint coating
Surface antirust 4: Galnavized (Hot galvanized or Cold galvanized or Electro Galvanized)

Surface Finish:
Surface finish 1: Stock finish
Surface finish 2: Sprial serrated
Surface finish 3: Two or three grooves (Water Lines)
Surface finish 4: Smooth finish

Blind Flanges Dimensions & Tolerances

blind_flange_dimn
NPS 1/2

Class 150 300 400 600 900 1500 2500
Diameter – D 90 95 95 95 120 120 135
Height – B 9.6 12.7 14.3 14.3 22.3 22.3 30.2
11.2 14.3 20.7 20.7 28.7 28.7 36.6
Diameter – G 35.1 35.1 35.1 35.1 35.1 35.1 35.1
Diameter – K 60.3 66.7 66.7 66.7 82.6 82.6 88.9
Bolt Holes 4 4 4 4 4 4 4
Diameter – L 15.9 15.9 15.9 15.9 22.2 22.2 22.2
Stud Bolts Diameter x Length
Diameter (in) 1/2 1/2 1/2 1/2 3/4 3/4 3/4
Length (mm) 55 65 75 75 110 110 120

———————– > NPS <--------------------

Dimensional Tolerances of Blind Flanges ASME B16.5

Outside Diameter
≤ 24 = 1.6 mm | > 24 = ± 3.2 mm
Inside Diameter
not applicable
Diameter of Contact Face
1.6 mm Raised Face = ± 0.8 mm
6.35 mm Raised Face, Tongue & Groove / Male-Female = ± 0.4 mm
Outside Diameter of Hub
≤ 12 = + 2.4 mm / – 1.6 mm | ≥ 14 = ± 3.2 mm
Diameter of Counterbore
not applicable
Drilling
Bolt Circle = 1.6 mm | Bolt Hole Spacing = ± 0.8 mm
Eccentricity of Bolt Circle with Respect to Facing
≤ 2½ = 0.8 mm max. | ≥ 3 = 1.6 mm max.
Thickness
≤ 18 = + 3.2 mm / – 0 | ≥ 20 = + 4.8 mm / – 0
Length thru Hub
≤ 18 = + 3.2 mm / – 0.8 mm | ≥ 20 = + 4.8 mm / – 1.6 mm

Notes

  1. Dimensions are in millimeters unless otherwise indicated.
  2. The length of the stud bolt does not include the height of the chamfers (points).

Blind Flanges Product Range
Range
½” (15 NB) to 48″ (1200NB) in 150 LBS, 300 LBS, 600 LBS, 900 LBS, 1500 LBS, 2500 LBS ASA 150, ASA 300, PN 6,10,16, 25, 40,64,100,160 ETC. Available with NACE MR 01-75

Stainless Steel Blind Flanges
Grade : 304, 304L, 304H, 309, 310, 310S, 316, 316Ti, 316 L, 317, 317L, 321, 347, 347 H, 409, 410, 410S, 420, 430L

Duplex Steel Blind Flanges
Grade : 2205 (UNS No. S31803), 2507 (UNS No. S32750)

Nickel Alloy Blind Flanges
Grade : Nickel 200 (UNS No. N02200), Nickel 201 (UNS No. N02201), Monel 400 (UNS No. N04400), Monel 500 (UNS No. N05500), Inconel 800 (UNS No. N08800), Inconel 825 (UNS No. N08825), Inconel 600 (UNS No. N06600), Inconel 625 (UNS No. N06625), Inconel 601 (UNS No. N06601), Hastelloy C 276 (UNS No. N10276), Alloy 20 (UNS No. N08020), Titanium (Grade I & II)

Copper Alloy Blind Flanges
Grade : UNS No. C 10100, 10200, 10300, 10800, 12000, 12200, 70600, 71500, UNS No. C 70600 (Cu -Ni- 90/10), C 71500 (Cu -Ni- 70/30)

Blind Flanges Standard

ANSI : ANSI B16.5, ANSI B16.47, MSS SP44, ANSI B16.36, ANSI B16.48
DIN : DIN2527, DIN2566, DIN2573, DIN2576, DIN2641, DIN2642, DIN2655, DIN2656, DIN2627, DIN2628, DIN2629, DIN 2631, DIN2632, DIN2633, DIN2634, DIN2635, DIN2636, DIN2637, DIN2638, DIN2673
B.S : BS4504, BS4504, BS1560, BS10
OTHER : PLATE, PLATE BLANK

Value Added Services for Blind Flanges
HOT DIPPED GALVANIZING
HEAT TREATMENT
CNC MACHINING
THREADING

Blind Flanges Packaging & Marking


All Blind Flanges are individually covered so that the premium quality of materials is retained and there are no damges in the last stages of production. We also ensure that we deliver our orders promplty and that the quality remains intact.
All Blind Flanges have imprints on them to highlight the specification of the pipes.

Origin of material (Make)

arcelor-mittal-romania dalmine-italy jfe-steel-japan jindal-saw-ltd-india sumitomo-metals-japan nipponsteel-japan mukat-tanks-and-vessel-ltd-india mannesmann-brazil maharashtra-seamless-limited-india tubacex-spain welspun-india v-and-m-japan-1 Tenaris

Available stock at Trio Steel

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