Blind Flanges

Your Professional Blind Flanges Supplier

Shanxi Hongkai Forging Co., Ltd. is located in China Energy Heavy Chemical Industry Base. Dingxiang County, the hometown of forging in Shanxi Province. Convenient transportation, abundant coal and power resources, fast communication and superior environment. Mainly produce flanges and forgings of various specifications. Application in piping installation, pressure vessel, equipment accessories.

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Why Choose Us

Our Service
With strong technical force, advanced production technology, perfect quality inspection, and reliable after-sales service, it provides a basis for supervision and cooperation for many customers at home and abroad.

Our Certificate
The company Excellent Supplier of 2019 Safety production standardization certificate Quality management system certification.

Production Market
The products are mainly exported. It is exported to Europe, America and other countries and regions. The product quality is good, and the service is attentive. It is deeply appreciated and trusted by customers and users at home and abroad, and has won a high reputation. They have become one of the largest flange and forging suppliers in China.

Our Factory
Shanxi Hongkai Forging Co., Ltd. is located in China Energy Heavy Chemical Industry Base. Dingxiang County, the hometown of forging in Shanxi Province. Convenient transportation, abundant coal and power resources, fast communication and superior environment.

Types of Blind Flanges

Raised Face Blind Flanges:

Raised face blind flanges feature a raised ring or face around the borehole, which allows for easy alignment and sealing when bolted to a mating flange.

Flat-Face Blind Flanges:

Flat-face blind flanges have a smooth and flat surface without any protrusions. They are suitable for applications where the mating flange or equipment has a flat face.

Ring Type Joint (RTJ) Blind Flanges:

RTJ blind flanges are designed to accommodate ring-type joint gaskets, which provide a reliable seal under high-pressure and high-temperature conditions.

Customized Blind Flanges:

Besides standard designs, blind flanges can be customized to meet specific requirements, such as non-standard sizes, materials, or pressure ratings.

Specifications of Blind Flanges

Flanges	Specifications
Flanges Types	Blind Flanges
Class	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
Size	1/2″ (15 NB) to 48″ (1200 NB)
Standard	ANSI/ASME B16.5, ANSI/ASME B16.47 Series A and Series B, MSS SP44, ASA, API 605, API 6A, AWWA, As per Custom Drawings
Pressure Rating	Class 150, Class 300, Class 400, Class 600, Class 900, Class1500, Class 2500 \| PN6, PN10, PN16, PN25, PN40, PN64 etc
Type	Raised Face (RF), Flat Face (FF), Ring Type Joint (RTJ), Lap-Joint Face (LJF), Large Male-Female (LMF), Small Male-Female (SMF), Large Tongue & Groove, Small Tongue, Groove

Advantages of Blind Flanges

Versatility:

Blind flanges can be used in a wide range of applications to seal off the ends of piping systems, vessels, or equipment.

Temporary or Permanent Sealing:

They can be installed temporarily for maintenance or testing purposes and permanently for equipment decommissioning or abandonment.

Leak-Proof Seal:

Blind flanges provide a secure and leak-proof seal when properly installed and tightened, preventing fluid or gas leakage.

Applications of a Blind Flange

Oil and Gas:

Blind flanges are used in oil refineries, petrochemical plants, and offshore platforms for system isolation, pressure testing, and equipment maintenance.

Chemical Processing:

In chemical processing facilities, blind flanges seal off pipelines during batch processing, cleaning, or equipment inspections.

Water Treatment:

In municipal water treatment plants and industrial facilities, blind flanges are employed in piping systems to control flow and isolate sections for repairs or upgrades.

Power Generation:

In power plants, blind flanges are utilized in steam, water, and gas pipelines to temporarily or permanently close them during maintenance shutdowns or equipment replacement.

HVAC Systems:

In heating, ventilation, and air conditioning (HVAC) systems, blind flanges seal off ductwork or piping branches to control airflow and pressure distribution.

Lead time

Quantity (kilograms)	1 - 100	101 - 500	> 500
Lead time (days)	15	20	To be negotiated

FAQ

Q: What are the grades of blind flanges?

A: ASTM A3015, ASTM A182, ASTM A694, and ASTM A105 are the most common grades available for Carbon Steel Blind Flanges. These grades of flanges undergo process of forging and are components of forged carbon steel piping. These components are applicable in fittings, flanges, valves, and others.

Q: How to calculate blind flange thickness?

A: The blind flange is attached by bolts causing an edge moment (Fig. UG- 34. /sketch j) in which the thickness can be calculated by : t = d *(CP/SE+1.9W hg/SE*d^3) ½ ………………. Formula (2) (From ASME UG-34) Where, d= Diameter or short span, measured as indicated in Fig.

Q: How to measure a blind flange?

A: FLANGE MEASUREMENTS. Measure across the centre from one side of the internal hole to the opposite side of the hole. Measure across the centre from the external edge to the other external edge of the flange. Measure from centre of the bolt hole to centre of the opposite bolt hole.

Q: What is the maximum hole size in a blind flange?

A: You should go to UG-36(c)(3): the upper limit for openings not requiring reinforcement is 2 3/8 in. for the finished (corroded) opening diameter.

Q: When to use a blind flange?

A: Blind flanges may be used when testing pipe pressure, to create an access point in a piping system, to temporarily seal a piping system while modifying or repairing the line, or to create a long-term seal to terminate a piping system. A blind flange is bolted, rather than welded in place.

Q: What are blind flanges designed to do?

A: Blind flanges are designed to close and seal off the ends of pipes or pressure vessels. They are mainly used in high pressure applications, to prevent the flow of liquid or gases.

We're well-known as one of the leading blind flanges manufacturers and suppliers in China. If you're going to wholesale high quality blind flanges with competitive price, welcome to get more information from our factory. Also, customized service is available.

Jis 20k Threaded Flanges, 6 150 blind flange, 1 2 threaded flange