What is a spectacle blind flange?

A spectacle blind flange is machined from a single piece of metal that is cut to match the pipe size, fit between two pipe flanges and requires an additional gasket when it is installed. Also, the bolts will need to be lengthened depending on what piping class and size blind is used. The thickness of the spectacle blind is specified based on the line pressure and pipe size.

API and ASME/ANSI flanges – comparing dimensions and pressure ratings

Although the dimensions of ASME and API flanges may sometimes be compatible for bolting – using the same bolt circle and the same number of bolts – they do not share the same pressure rating system.

ASME rates the pressure of a class based on the material of construction and the design temperature

API specifies allowable materials and gives it a specific pressure rating

The difference between ASME/ANSI and API is the fabrication material and a higher rated API operating pressure.

ASME/ANSI flanges are commonly used in industrial process systems handling water, steam, air and gas. API flanges are manufactured for high strength operating refinery systems with products such as oil and explosive gases.

¹⁾ In the old API standard, flanges ranged from 1 1/2 to 10(20) inches.

• 1 inch = 25.4 mm

Applications Of API 6A F51 RTJ Spectacle Blind Flange:

1. petrochemical industry

2. Pharmaceutical industry

3. Food industry

4. Aviation and aerospace industry

5. Architectural decoration industry

6. Oil and gas industry

Other Features:

1) Chemical and Physical characteristic: durable, corrosion resistant and high-temperature resistant

2) We also produce flange with special specifications according to customers’ requirements;

Packing

1) Packing Method:

Normal packing: Plastic film or bubble paper wrapped, endings protect  by caps,

then into wooden case or load on fumigation plywood pallet.

Custom product: As per your request.

2) Shipping:

By Sea, By Air, By Train or River-and-Sea Coordinated Transport, according to your request.

Where can we find the high quality API 6A F51 RTJ Spectacle Blind Flange 3-1/8 Inch 5000PSI.