Figure 8 Blind Flanges

TYPE: SPECTACLE BLANKS, SPADES, RING SPACERS. Material: A105, A350 LF2, A36, A516 GR60/70, SS 400, A182 F11/F304/F316/F51/F53/F55 etc. Size: 1/2" ~ 24", ( ≥ 26”) . Standard: ASME B16.48, ( ASME B16.47 ASME BPVC Section VIII Div 1 ). Pressure: CLASS 150 ~ 2500. Flange Facing: RF, FF, RTJ, M&F, T&G. Customization: OEM/ODM service. Samples: Sample service available.

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Product Description

High-Performance Figure 8 Blind Flanges for Safe Pipeline Isolation

When you need a reliable solution to isolate sections of high-pressure pipelines, Figure 8 Blind Flanges deliver unmatched safety and compliance. Engineered to ASME B16.48 standards, these flanges ensure zero-leak performance in oil refineries, offshore platforms, and petrochemical plants. With over 15 years of expertise, we combine precision manufacturing, global certifications, and fast delivery to meet your project timelines.

What Are Figure 8 Blind Flanges?

The products (also called spectacle blinds or spades) are critical safety components used to permanently or temporarily block fluid flow in pipelines. Their unique "figure 8" design features a blind section and an open spacer ring, allowing operators to safely switch between isolation and flow modes.

Key Features

Materials: Carbon steel (A105), stainless steel (F304/F316), duplex steel (F51/F53).
Pressure Rating: Class 150 to 2500 (up to 138 MPa).
Standards: ASME B16.48, API 6A, EN 1092-1, PED.
Sizes: ½" to 24" (custom sizes up to 60" available).

Material Specifications

STANDARD	TYPE	SIZE	PRESSURE
ASME B16.5	WN, SO, SW, BLD, THREADED, LP	1/2" ~ 24"	CLASS 150 ~ 2500
ASME B16.36	WN, SO, THREADED	1/2" ~ 24"	CLASS 300LB ~ 2500
ASME B16.47	WN BLD	26" ~ 60"	CLASS 75 ~ 900
ASME B16.48	SPECTACLE BLANKS, SPADES, RING SPACERS	1/2" ~ 24"	CLASS 150 ~ 2500
AWWA C207	STEEL RING, BLD, STEEL HUB	4" ~ 96"	86 ~ 275 PSI
API 6A	WN, BLD, THREADED, INTEGRAL, TEST	2-1/16" ~ 20-3/4"	13.8 MPa ~ 138.0 MPa
API 605	WN	26" ~ 60"	CLASS 150 ~ 900
SANS 1123	WN, PLATE, SCREWED, SO, LOOSE, BLANK, INTEGRAL	DN 10 ~ 3600	250 ~ 4000 kPa
AS 2129	BLD, PLATE, BOSS, WN	DN 15 ~ 1800	TABLE A ~ TABLE T
BS 3293	SO, WN	26" ~ 48"	CLASS 150 ~ 600
BS 4504	PLATE, LOOSE, BLANK, WN, SO, THREADED, WO PLATE, INTEGRAL	DN 10 ~ 4000	PN 6 ~ 40
EN 1092-1	PLATE, LOOSE, BLIND, WN, SO, THREADED, WO PLATE, INTEGRAL	DN 10 ~ 3600	PN 6 ~ 400
JIS B2220	SOP, SOH, SW, WN, LJ, TR, IT, BL	DN 10 ~ 1500	5 ~ 63 K
MSS SP-44	BLD, WN	12" ~ 60"	CLASS 150,19.6bar ~ CLASS 900, 153.1 bar

Why Choose Our Figure 8 Blind Flanges?

1. Full Compliance, Zero Compromise

Every flange undergoes 100% dimensional checks, PMI testing, and hydrostatic validation to meet API, ASME, and PED standards for Figure 8 Blind Flanges.

2. Corrosion Resistance Built-In

Choose materials like duplex steel (F55) or epoxy-coated A350 LF2 for harsh environments, including sour gas (NACE MR0175 certified).

3. Fast Delivery, No Delays

30% of our inventory is pre-stocked for same-day dispatch. Bulk orders ship in 7–15 days.

4. Customization Without Complexity

Need non-standard bore sizes, thicknesses, or threading? Our R&D team delivers prototypes in 10–12 days.

Applications

Oil & Gas: Isolate drilling rig pipelines during maintenance.
Power Plants: Block steam lines in high-temperature systems.
Chemical Processing: Safely handle corrosive fluids.

Trusted by Global Industries

Our Strengths:

GMP-Certified Factory: Ensures batch-to-batch consistency.
Triple-Layer Packaging: Wooden crates + moisture-proof layers prevent transit damage.
24/7 Support: Technical experts assist with urgent requests.

Quality Control

Factory Equipment

Shipping Packaging

FAQ

Q: Can you match legacy flange specifications?

A: Yes! We replicate obsolete designs with full material traceability.

Q: What's the MOQ for custom orders?

A: 50 units (flexible for large projects).

Q: Do you provide test reports?

A: Yes – hydrostatic, PMI, and hardness reports included.

Contact Us

Email: info@sxqinsteel.com

Response Time: <4 hours during business days.

For high-pressure pipeline safety, trust Figure 8 Blind Flanges that combine rigorous testing, global certifications, and rapid delivery. Let's secure your systems today!