A105 Large Diameter Blind Flange

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A105 Large Diameter Blind Flange is a critical component used for sealing the ends of large-diameter piping systems, pressure vessels, and equipment in heavy-duty industrial applications. Manufactured from ASTM A105 carbon steel, these flanges are designed to handle high-pressure and high-temperature conditions while offering a secure, leak-proof closure. The large diameter design enables them to be used in infrastructure projects, petrochemical plants, refineries, offshore rigs, and power stations where robust and reliable sealing is essential.

As a manufacturer, stockist, and exporter, companies producing A105 Large Diameter Blind Flanges typically cater to a global clientele. These flanges are forged for superior mechanical strength and dimensional accuracy, and they meet international standards such as ASME B16.47 (Series A & B), API 6A, and ASME B16.5. They are available in sizes up to 60 inches (DN1500) and are manufactured in pressure classes ranging from 150 to 2500. Their wide availability and customizable design make them suitable for a range of demanding engineering environments.

A105 Large Diameter Blind Flanges are commonly exported to countries in the Middle East, including Oman, Qatar, Saudi Arabia, UAE, and Kuwait, where infrastructure and energy projects often demand high-strength, large-size components. Additionally, these flanges are supplied to Spain, Germany, and other parts of Europe, as well as North America (USA, Canada), and across various African nations, supporting global industries with a strong emphasis on quality and compliance.

The flanges undergo strict quality control measures, including ultrasonic testing, hydrostatic testing, and certification under EN 10204 3.1 or 3.2. Exporters and manufacturers often provide value-added services such as painting, galvanizing, and machining to meet customer-specific requirements. The flanges are usually supplied with surface finishes like serrated or stock finish and are designed with RF (Raised Face), FF (Flat Face), or RTJ (Ring Type Joint) faces.

Specification of A105 Large Diameter Blind Flange

Specification	Details
Material Grade	ASTM A105 (Carbon Steel)
Standard	ASME B16.5 / ANSI B16.5 / ASTM A105 / DIN / EN / BS
Size Range	½” NB to 48” NB (Nominal Bore)
Pressure Rating (Class)	150#, 300#, 600#, 900#, 1500#, 2500#
Flange Types	Weld Neck, Slip-On, Blind, Socket Weld, Threaded, Lap Joint, Orifice
Facing Type	Raised Face (RF), Flat Face (FF), Ring Type Joint (RTJ)
Connection Type	Welded, Thread

Mechanically, A105 Large Diameter Blind Flanges offer a minimum tensile strength of 485 MPa and a minimum yield strength of 250 MPa, with elongation of at least 22%. Their construction ensures reliable performance under dynamic loads and fluctuating pressure conditions. These characteristics make them ideal for sealing off large pipelines in critical operations where failure is not an option.

A105 Large Diameter Blind Flanges serve as indispensable components in modern industrial piping systems. Their strength, size range, and compliance with international standards make them the preferred choice for engineers, project managers, and procurement teams worldwide. Their consistent availability, especially from experienced exporters, ensures timely delivery to support high-priority global projects.

A105 Blind Flange Chemical Properties

Element	Composition (%)
Carbon (C)	0.35 max
Manganese (Mn)	0.60 – 1.05
Phosphorus (P)	0.035 max
Sulfur (S)	0.040 max
Silicon (Si)	0.10 – 0.35
Copper (Cu)	0.40 max (if specified)
Nickel (Ni)	0.40 max (if specified)
Chromium (Cr)	0.30 max (if specified)
Molybdenum (Mo)	0.12 max (if specified)
Vanadium (V)	0.08 max (if specified)

A105 Blind Flange Mechanical Properties

Property	Value	Unit	Notes
Tensile Strength	485 – 655	MPa	Minimum 70 – 95 ksi
Yield Strength (0.2% Offset)	≥ 250	MPa	Minimum 36 ksi
Elongation (in 2")	≥ 22	%	For standard specimen
Reduction of Area	≥ 30	%	May vary depending on test method
Hardness (Brinell)	≤ 187	HB	Maximum, as per ASTM A105 specification
Impact Energy (Charpy V-Notch)	Not required unless specified	–	Required only for low-temperature service

A105 Large Diameter Blind Flange

NPS (inches)	Flange OD (mm)	Thickness (mm)	Bolt Circle Dia. (mm)	No. of Bolts	Bolt Hole Dia. (mm)
1/2"	89	11	60	4	16
3/4"	98	13	70	4	16
1"	108	14	79	4	16
1 1/4"	117	14	89	4	16
1 1/2"	127	16	98	4	16
2"	152	17	121	4	19
2 1/2"	178	18	140	4	19
3"	190	19	152	4	19
4"	229	24	190	8	19
5"	254	24	216	8	22
6"	279	25	241	8	22
8"	343	29	298	8	22
10"	406	30	362	12	25
12"	483	32	432	12	25
14"	533	35	483	12	29
16"	597	38	543	16	29
18"	635	41	603	16	32
20"	698	43	635	20	32
24"	813	48	749	20	35

Features of A105 Large Diameter Blind Flange

Healthy, non-toxic, and stain-free
High temperature and pressure resistance
Hot welding connection
Leak prevention
Excellent heat insulation
Lightweight and easy to transport
Smooth inner wall for reduced pressure loss
Low noise
Suitable for exposed or hidden installation
Chemical corrosion resistance

Available Types Of A105 Large Diameter Blind Flange

A105 Pressure Vessel Flange	Forged A105 Blind Flange
A105 Flange RTJ	A105 RF Blind Flange
CS HEAVY BLRF FLANGE	ANSI B16.47 Series A Blind Flange
ANSI B16.47 Series B Blind Flange	MSS SP-44 A105 Blind Flange
A105 Schedule 160 Blind Flange	ANSI/ASME B16.5 Blind Flange
ANSI/ASME B16.47 Series A(MSS SP44) Blind Flanges	ANSI/ASME B16.47 Series B Blind Flange
carbon steel slip on flanges	Custom A105 Blind Flange
A105 Forged Oversized Flange	A105 XXS Blind Flange

Applications Industry

Pharmaceutical Equipment
Chemical Equipment
Sea Water Equipment
Heat Exchangers
Condensers
Pulp and Paper Industry

Off-Shore Oil Drilling Companies
Power Generation
Petrochemicals
Gas Processing
Specialty Chemicals
Pharmaceuticals

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