Blind Flange Class 150 (ASME B16.5)

Class 150 Blind Flange Dimensions
Size in Inch	Size in mm	Outer Dia.	Flange Thick.	RF Dia.	RF Height	PCD	No of Bolts	Bolt Size UNC	Machine Bolt Length	RF Stud Length	Hole Size	ISO Stud Size	Weight in kg
		A	B	C	D	E
1/2	15	90	9.6	34.9	2	60.3	4	1/2	50	55	5/8	M14	0.9
3/4	20	100	11.2	42.9	2	69.9	4	1/2	50	65	5/8	M14	0.9
1	25	110	12.7	50.8	2	79.4	4	1/2	55	65	5/8	M14	0.9
1 1/4	32	115	14.3	63.5	2	88.9	4	1/2	55	70	5/8	M14	1.4
1 1/2	40	125	15.9	73	2	98.4	4	1/2	65	70	5/8	M14	1.8
2	50	150	17.5	92.1	2	120.7	4	5/8	70	85	3/4	M16	2.3
2 1/2	65	180	20.7	104.8	2	139.7	4	5/8	75	90	3/4	M16	3.2
3	80	190	22.3	127	2	152.4	4	5/8	75	90	3/4	M16	4.1
3 1/2	90	215	22.3	139.7	2	177.8	8	5/8	75	90	3/4	M16	5.9
4	100	230	22.3	157.2	2	190.5	8	5/8	75	90	3/4	M16	7.7
5	125	255	22.3	185.7	2	215.9	8	3/4	85	95	7/8	M20	9.1
6	150	280	23.9	215.9	2	241.3	8	3/4	85	100	7/8	M20	11.8
8	200	345	27	269.9	2	298.5	8	3/4	90	110	7/8	M20	20.5
10	250	405	28.6	323.8	2	362	12	7/8	100	115	1	M24	32
12	300	485	30.2	381	2	431.8	12	7/8	100	120	1	M24	50
14	350	535	33.4	412.8	2	476.3	12	1	115	135	1 1/8	M27	64
16	400	595	35	469.9	2	539.8	16	1	115	135	1 1/8	M27	82
18	450	635	38.1	533.4	2	577.9	16	1 1/8	125	145	1 1/4	M30	100
20	500	700	41.3	584.2	2	635	20	1 1/8	140	160	1 1/4	M30	130
24	600	815	46.1	692.2	2	749.3	20	1 1/4	150	170	1 3/8	M33	196

Blind Flange Class 150 (ASME B16.5)

Blind flanges are a critical component in piping systems used across various industries, such as oil and gas, chemical processing, water treatment, and power generation. One of the most commonly used types is the Blind Flange Class 150, which adheres to the ASME B16.5 standard.

What is a Blind Flange?

A blind flange is a solid plate that is used to close off the end of a piping system or pressure vessel. Unlike other types of flanges, a blind flange does not have a bore, making it ideal for blocking the flow of liquids, gases, or other substances. It is typically installed using bolts and can be removed easily for maintenance, inspection, or system modifications.

What is Class 150?

The term Class 150 refers to the pressure-temperature rating of the flange as defined by the ASME B16.5 standard. A Class 150 flange can withstand a maximum pressure of 285 psi (19.6 bar) at ambient temperature (up to 100°F). As the temperature increases, the pressure rating decreases. This makes it suitable for moderate-pressure applications.

ASME B16.5 Standard

The ASME B16.5 standard specifies the dimensions, materials, pressure-temperature ratings, and tolerances for pipe flanges and flanged fittings. Blind flanges conforming to this standard ensure compatibility and safety across various systems. It covers flange sizes from ½ inch to 24 inches and pressure classes ranging from Class 150 to Class 2500.

Material Options for Blind Flange Class 150

Blind flanges are available in a variety of materials to suit different industrial needs:

• Carbon Steel: Commonly used for its strength and cost-effectiveness.
• Stainless Steel: Resistant to corrosion, making it suitable for harsh environments and applications involving aggressive chemicals.
• Alloy Steel: Offers enhanced mechanical properties and corrosion resistance.
• Other Materials: Such as duplex steel, nickel alloys, and aluminum, for specialized applications.

Materials are selected based on factors like operating temperature, pressure, and fluid composition.

Applications of Blind Flange Class 150

Blind flanges are used in a wide range of applications, including:

• Pipeline Termination: To close off the end of a pipeline permanently or temporarily.
• Inspection and Maintenance: Allows access to internal pipeline components without dismantling the entire system.
• Testing: Used to isolate sections of a pipeline for pressure testing.
• Versatility Across Industries: Oil and gas, petrochemical, water treatment, power plants, and more.

A Blind Flange Class 150 is an essential component for any piping system, offering safety, durability, and compliance with international standards. Whether you’re working in the oil and gas sector, water treatment, or chemical processing, this flange provides a reliable solution for terminating pipelines or isolating sections for maintenance. Ensure you choose the correct material and size to suit your specific application.

For high-quality Blind Flange Class 150 products, trust reputable manufacturers who adhere to ASME B16.5 standards. Contact us today to learn more about our range of blind flanges and get expert guidance on selecting the right solution for your project.