Company Introduction

Company Introduction

Mcneil Instruments is a trusted name in the global steel and metal industry, delivering premium-quality products and customized solutions to meet diverse industrial needs. With a strong presence in the UAE and across international markets, we specialize in manufacturing and supplying stainless steel pipes, tubes, flanges, fasteners, and other high-performance metal products.

Our commitment to quality, innovation, and customer satisfaction sets us apart. Backed by years of industry expertise, we adhere to international standards and ensure precision engineering in every product we deliver. At Mcneil Steel & Alloys FZE, we aim to build long-lasting relationships with clients by providing reliable, durable, and cost-effective solutions for industries such as oil & gas, construction, marine, and petrochemicals.

Spectacle Blind Flange

What is a Spectacle Blind Flange?

A Spectacle Blind Flange is a safety device used in piping systems to isolate sections for maintenance or inspection. It consists of two metal discs connected by a small section of metal resembling a pair of spectacles — one disc is a solid blank (blind) that blocks the flow, and the other is a ring (spacer) that allows flow. The entire unit is rotated to align either the solid or the open part with the pipe, depending on whether flow should be stopped or allowed. Spectacle blinds are usually installed permanently between flanges in a pipeline.

Key Features of Spectacle Blind Flanges:

  • Dual Functionality: Acts as both a blind and a spacer, offering flexibility in pipeline operations.
  • Permanent Installation: Designed for long-term installation without needing to remove components.
  • Safety Enhancement: Ensures complete isolation during maintenance or shutdown, preventing accidental flow.
  • Durable Construction: Made from stainless steel, carbon steel, or alloy steel for strength and corrosion resistance.
  • Easy Identification: The “spectacle” shape visually indicates whether the line is open or closed.
  • Custom Sizes & Standards: Available in various pressure ratings (ANSI, ASME, DIN) and sizes.

Common Uses of Spectacle Blind Flanges:

  • Oil & Gas Industry: For securely isolating sections during maintenance or pressure testing.
  • Chemical Plants: To prevent hazardous leaks during shutdowns.
  • Power Plants: Used in high-pressure steam lines and water systems.
  • Refineries & Petrochemical Plants: For safe isolation of process pipelines.
  • Water Treatment Facilities: Where selective pipeline isolation is necessary for cleaning or repairs.
  • Shipbuilding & Marine Applications: Ensures secure and visual isolation in fluid systems.
Flanges Specifications & Standards

Flanges Specifications & Standards

Specifications
International Standards
Size Range½” to 48” (DN15 to DN1200)
Pressure RatingsClass 150, 300, 600, 900, 1500, 2500
TypesWeld Neck, Slip-On, Blind, Threaded, Socket Weld, Lap Joint, Long Weld Neck, Spectacle Blind, Orifice, Ring Type Joint, etc.
Face TypesRaised Face (RF), Flat Face (FF), Ring Type Joint (RTJ), Large Male & Female, Tongue & Groove
Material GradesStainless Steel (304, 316, 321, 347), Carbon Steel (A105, A350 LF2), Alloy Steel (F11, F22), Duplex, Super Duplex, Inconel, Monel, Hastelloy
Flange ThicknessAs per ASME B16.5, B16.47, EN1092-1 or client requirement
Drilling TemplatesANSI/ASME, BS, DIN, EN, JIS, GOST, etc.
Surface FinishStock finish (125–250 AARH), Spiral serrated, Smooth finish, or as specified
TestingPMI, UT, RT, Hydro Test, Visual & Dimensional Inspection
Coating (if any)Black Paint, Anti-Rust Oil, Galvanized, FBE, or Custom
ASME B16.5Pipe Flanges and Flanged Fittings (½” to 24”)
ASME B16.47Large Diameter Steel Flanges (26” to 60”) – Series A & B
ASME B16.36Orifice Flanges
ASME B16.48Line Blanks (Spectacle Blinds, Spades & Spacers)
EN 1092-1European Standard for Circular Flanges (PN6 to PN100)
BS 4504British Standard Flanges for Pipes, Valves & Fittings
DIN 2633 / 2576German Industrial Standard Flanges
JIS B2220Japanese Standard Flanges
GOST 12820/12821Russian Flange Standards
MSS SP-44Steel Pipe Line Flanges for High-Pressure Transmission Services
API 605Former Standard for Large Diameter Flanges (merged into ASME B16.47 Series B)
Flange Specifications
StandardsANSI Flanges, ASME Flanges, BS Flanges, DIN Flanges, EN Flanges, etc
DimensionsANSI/ASME B16.5, B 16.47 Series A & B, B16.48, BS4504, BS 10, EN-1092, DIN, etc
Sizes1/2″ (15 NB) to 48″ (1200NB)
Class/Pressure150#, 300#, 600#, 900#, 1500#, 2500#, PN6, PN10, PN16, PN25, PN40, PN64 etc
Flange Face TypeFlat Face (FF), Raised Face (RF), Ring Type Joint (RTJ)
FormsSlip on, Socket weld, Forged, Blind, Welding neck, Ring type joint, Spectacle blind, Reducing, Threaded, Tongue & Groove, Long weld neck, Plate flange, ASME B16.5 flange
Range15 NB UP TO 600 NB IN 150 LBS , 300 LBS, 400 LBS , 600 LBS , 900 LBS , 1500 LBS , 2500 LBS / TABLE 2.5 , TABLE 6 , TABLE 10, TABLE 16,TABLE 25 , TABLE 40, TABLE 64, TABLE 160, TABLE 320, TABLE 400
FormSlip On , Socket Weld , Blind , Lapped , Screwed , Weld Neck , Reducing , Spectacle ,Slip On Boss , Plate , Plate Blank , Screwed Boss.
Stainless SteelASTM / ASME SA 182 F 304 , 304L , 304H, 309H, 310H , 316 , 316H , 316L , 316 LN , 317 , 317L , 321 , 321H , 347H
Duplex SteelASTM / ASME SA 182 F 44 , F 45 , F51 , F 53 , F 55 , F 60 , F 61
RangeSame as Stainless
FormSame as Stainless
Carbon SteelASTM / ASME A 105 , ASTM / ASME A 350 LF 2
Alloy SteelASTM / ASME A 182 GR F 5, F 9 , F 11 , F 12 , F 22 , F 91
RangeSame as Stainless
FormSame as Stainless
Nickel AlloyASTM / ASME SB 564 UNS 2200, 4400, 8825, 6600, 6601, 6625, 10276 etc
Copper AlloyASTM / ASME SB 61, SB 62, SB 151, SB 152 (various UNS/CU-NI grades)
GradesHastelloy C-22, C-276, C-2000
Size1/2″NB to 12″NB
StandardASTM, ASME, API, AISI, BS, ANSI, DIN, JIS, MSSP, NACE
TypesSocket Weld, Slip On, Blind, Lapped, Screwed, Weld Neck, Long Weld Neck, Reducing, Spectacle, Ring Joint
FeaturesDurability, Corrosion resistance, Dimensional accuracy, High strength, Excellent finish
GradesInconel 600, 601, 625, 625LCF, 686, 718, 800, 825, X-750
Size1/2 inch – 48 inch (15mm – 1200mm)
StandardANSI/ASME B16.5, ANSI B16.47 API, DIN, JIS, BS
TypesSame as Hastelloy
FeaturesSame as Hastelloy
GradesIncoloy 800, 825, 925, A-286, DS
Flanges GradeASTM A 182 F 304/L; 316/L; 317/L; 309; 310; 321; 347; 904L
TypeSORF, BLRF, WNRF, SOLJ
Class50 To 3000
RangeDN15 to DN1800 in multiple pressure classes
FeaturesSame as Inconel
GradesMonel 400, Monel K500
Range1/2″ NB to 60″ NB
TypesSame as above
FeaturesDurability, Corrosion resistance, Dimensional accuracy, High strength, Chemical resistance, Excellent finish
MaterialTitanium
GradeGr2, Gr5, Gr7, Gr9
StandardsDIN, ASTM, BS
ApplicationBicycles, Motors, Chemicals
StrengthsSuperior Quality, Fast delivery, Competitive pricing, Humanized after-sales
FeaturesLow density, Rustless, Good antiwear, High strength
SizeAs per customer requirements
Most Selling Types Of Flanges

Most Selling Types Of Flanges

Weld Neck Flange Weld Neck Flange Slip-On Flange Slip-On Flange Blind Flange Blind Flange Threaded Flange Threaded Flange Socket Weld Flange Socket Weld Flange Lap Joint Flange Lap Joint Flange Long Weld Neck Flange Long Weld Neck Flange Expander Flange Expander Flange Orifice Flange Orifice Flange Spade and Ring Spacer Flange Spade and Ring Spacer Flange Spectacle Blind Flange Spectacle Blind Flange High Hub Flange High Hub Flange Flat Flange Flat Flange Loose Flange Loose Flange Ring Type Joint Flange Ring Type Joint Flange SORF Flange SORF Flange BLRF Flange BLRF Flange Groove & Tongue Flange Groove & Tongue Flange
Spectacle Blind Flange Export Countries

Spectacle Blind Flange Manufacturer, Supplier, Exporter in Countries

Country Country Country Country
Spectacle Blind Flange Exporter in Kuwait Spectacle Blind Flange Exporter in India Spectacle Blind Flange Exporter in Oman Spectacle Blind Flange Exporter in Iran
Spectacle Blind Flange Exporter in Qatar Spectacle Blind Flange Exporter in China Spectacle Blind Flange Exporter in UAE Spectacle Blind Flange Exporter in Africa
Spectacle Blind Flange Exporter in Turkey Spectacle Blind Flange Exporter in Mexico Spectacle Blind Flange Exporter in Canada Spectacle Blind Flange Exporter in Malaysia
Spectacle Blind Flange Exporter in Saudi Arabia Spectacle Blind Flange Exporter in Brazil Spectacle Blind Flange Exporter in USA Spectacle Blind Flange Exporter in Sri Lanka
Spectacle Blind Flange Exporter in Australia Spectacle Blind Flange Exporter in Nigeria Spectacle Blind Flange Exporter in 85+ countries
Spectacle Blind Flange Export Countries

Manufacturer & Exporter of Spectacle Blind Flange in the Following Countries

Country Country Country Country Country
Saudi Arabia Kazakhstan Zimbabwe Netherlands India
Afghanistan Belgium UAE Israel Europe
New Zealand Mexico Canada Venezuela United Kingdom
United States South Africa Malaysia Poland Germany
Singapore Sri Lanka Australia Brazil Ireland