Loose Flanges Manufacturers in Kuwait

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.

Loose Flange

What is a Loose Flange?

Loose Flanges, also known as Lap Joint Flanges, are flanges that are not welded or permanently fixed to the pipe. They are used with a stub end that is welded to the pipe, allowing the flange to rotate freely around it. This design simplifies the alignment of bolt holes and enables quick assembly or disassembly. Loose flanges are ideal for systems requiring frequent maintenance, inspection, or adjustments where precise bolt alignment is important.

Key Features of Loose Flanges:

Rotational Flexibility: Can be rotated for perfect bolt alignment during installation.
Reusability: Easy to remove and reuse, lowering replacement costs.
Low Installation Cost: No need for precise welding alignment.
Corrosion Resistance: Only the stub end contacts the fluid, allowing use of corrosion-resistant materials.
Ideal for Large or Hard-to-Align Piping: Perfect for big or awkward layouts.

Common Uses of Loose Flanges:

Maintenance-Heavy Systems: For pipelines needing frequent inspection or part replacement.
Low-Pressure Applications: Used in non-critical piping systems.
Corrosive Environments: Works well with corrosion-resistant stub ends.
Water and Wastewater Systems: Common in treatment plants due to easy disassembly.
Food and Beverage Industry: Ideal where hygiene and frequent disassembly are needed.

Flanges Specifications & Standards

Specifications

International Standards

Size Range	½” to 48” (DN15 to DN1200)
Pressure Ratings	Class 150, 300, 600, 900, 1500, 2500
Types	Weld Neck, Slip-On, Blind, Threaded, Socket Weld, Lap Joint, Long Weld Neck, Spectacle Blind, Orifice, Ring Type Joint, etc.
Face Types	Raised Face (RF), Flat Face (FF), Ring Type Joint (RTJ), Large Male & Female, Tongue & Groove
Material Grades	Stainless Steel (304, 316, 321, 347), Carbon Steel (A105, A350 LF2), Alloy Steel (F11, F22), Duplex, Super Duplex, Inconel, Monel, Hastelloy
Flange Thickness	As per ASME B16.5, B16.47, EN1092-1 or client requirement
Drilling Templates	ANSI/ASME, BS, DIN, EN, JIS, GOST, etc.
Surface Finish	Stock finish (125–250 AARH), Spiral serrated, Smooth finish, or as specified
Testing	PMI, UT, RT, Hydro Test, Visual & Dimensional Inspection
Coating (if any)	Black Paint, Anti-Rust Oil, Galvanized, FBE, or Custom

ASME B16.5	Pipe Flanges and Flanged Fittings (½” to 24”)
ASME B16.47	Large Diameter Steel Flanges (26” to 60”) – Series A & B
ASME B16.36	Orifice Flanges
ASME B16.48	Line Blanks (Spectacle Blinds, Spades & Spacers)
EN 1092-1	European Standard for Circular Flanges (PN6 to PN100)
BS 4504	British Standard Flanges for Pipes, Valves & Fittings
DIN 2633 / 2576	German Industrial Standard Flanges
JIS B2220	Japanese Standard Flanges
GOST 12820/12821	Russian Flange Standards
MSS SP-44	Steel Pipe Line Flanges for High-Pressure Transmission Services
API 605	Former Standard for Large Diameter Flanges (merged into ASME B16.47 Series B)

Flange Specifications

Standards	ANSI Flanges, ASME Flanges, BS Flanges, DIN Flanges, EN Flanges, etc
Dimensions	ANSI/ASME B16.5, B 16.47 Series A & B, B16.48, BS4504, BS 10, EN-1092, DIN, etc
Sizes	1/2″ (15 NB) to 48″ (1200NB)
Class/Pressure	150#, 300#, 600#, 900#, 1500#, 2500#, PN6, PN10, PN16, PN25, PN40, PN64 etc
Flange Face Type	Flat Face (FF), Raised Face (RF), Ring Type Joint (RTJ)
Forms	Slip on flanges, Socket weld flanges, Forged flanges, Blind flanges, Welding neck flange, Ring type joint flange, Spectacle blind flange, Reducing flange, Threaded / Screwed flange, Tongue and Groove flange, Long weld neck flange, Plate flange, ASME B16.5 flange

Range	15 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
Form	Slip On , Socket Weld , Blind , Lapped , Screwed , Weld Neck , Reducing , Spectacle ,Slip On Boss , Plate , Plate Blank , Screwed Boss.
Stainless Steel	ASTM / ASME SA 182 F 304 , 304L , 304H, 309H, 310H , 316 , 316H , 316L , 316 LN , 317 , 317L , 321 , 321H , 347H
Duplex Steel	ASTM / ASME SA 182 F 44 , F 45 , F51 , F 53 , F 55 , F 60 , F 61

Range	Same as Stainless
Form	Same as Stainless
Carbon Steel	ASTM / ASME A 105 , ASTM / ASME A 350 LF 2
Alloy Steel	ASTM / ASME A 182 GR F 5, F 9 , F 11 , F 12 , F 22 , F 91

Range	Same as Stainless
Form	Same as Stainless
Nickel Alloy	ASTM / ASME SB 564 UNS 2200, 4400, 8825, 6600, 6601, 6625, 10276 etc
Copper Alloy	ASTM / ASME SB 61, SB 62, SB 151, SB 152 (various UNS/CU-NI grades)

Grades	Hastelloy C-22, C-276, C-2000
Size	1/2″NB to 12″NB
Standard	ASTM, ASME, API, AISI, BS, ANSI, DIN, JIS, MSSP, NACE
Types	Socket Weld, Slip On, Blind, Lapped, Screwed, Weld Neck, Long Weld Neck, Reducing, Spectacle, Ring Joint
Features	Durability, Corrosion resistance, Dimensional accuracy, High strength, Excellent finish

Grades	Inconel 600, 601, 625, 625LCF, 686, 718, 800, 825, X-750
Size	1/2 inch – 48 inch (15mm – 1200mm)
Standard	ANSI/ASME B16.5, ANSI B16.47 API, DIN, JIS, BS
Types	Same as Hastelloy
Features	Same as Hastelloy

Grades	Incoloy 800, 825, 925, A-286, DS
Flanges Grade	ASTM A 182 F 304/L; 316/L; 317/L; 309; 310; 321; 347; 904L
Type	SORF, BLRF, WNRF, SOLJ
Class	50 To 3000
Range	DN15 to DN1800 in multiple pressure classes
Features	Same as Inconel

Grades	Monel 400, Monel K500
Range	1/2″ NB to 60″ NB
Types	Same as above
Features	Durability, Corrosion resistance, Dimensional accuracy, High strength, Chemical resistance, Excellent finish

Material	Titanium
Grade	Gr2, Gr5, Gr7, Gr9
Standards	DIN, ASTM, BS
Application	Bicycles, Motors, Chemicals
Strengths	Superior Quality, Fast delivery, Competitive pricing, Humanized after-sales
Features	Low density, Rustless, Good antiwear, High strength
Size	As per customer requirements