Blind

Blind fittings made from carbon, alloy, corrosion-resistant, duplex, and super duplex steels for reliable pipeline sealing. Delivery to the destination point. ASME blind fittings are used to securely close the ends of pipes in technological systems. They are applied both during pipeline commissioning and during temporary shutdowns—for testing, maintenance, or reconstruction. These products are designed to operate under high pressure, elevated temperatures, and exposure to aggressive environments. Manufacturing materials include carbon and low-alloy steels, stainless austenitic alloys, as well as duplex steels, ensuring strength and leak-tight connections even under long-term loads. All ASME blind fittings are manufactured in accordance with international standards such as ASME B16.9 and ASME B16.5, guaranteeing compatibility with pipeline systems used in the oil and gas, petrochemical, chemical, and power generation industries.

ASME blind fittings for pipes: types and applications

Blind fittings are classified by connection type, material, and design:

- flanged blinds (ASME B16.5) — suitable for detachable connections and installed using bolted fastening;

- welded blinds (ASME B16.9) — provide long-term sealing under constant load;

- threaded blinds — used in low-pressure systems and auxiliary sections of pipelines.

The choice of design depends on operating conditions such as pressure, temperature, and chemical activity of the medium.

ASME spectacle blind: what it is and where it is used

An ASME spectacle blind (also called a line blind or rotating blind) is designed for quick and convenient shut-off of flow without dismantling the connection.

Key features:

- the design consists of a solid disk connected to a ring by a rotating segment, allowing the line to be opened or closed by rotating the element;

- used in systems requiring regular inspection or frequent isolation of pipeline sections;

- commonly applied during testing, maintenance, or commissioning of equipment.

These blinds are manufactured from stainless and corrosion-resistant steels, withstand high pressure, and maintain tight sealing even after repeated operating cycles.

FAQ

1. Are there differences when installing blinds on vertical and horizontal pipelines?

There are no functional restrictions, but in vertical pipelines it is necessary to consider additional loads caused by weight and possible gravitational effects on the sealing elements.

2. What temperature range is acceptable for stainless steel blinds?

Depending on the steel grade, the operating range may vary from –196 °C to +600 °C. The exact range depends on the alloy’s resistance to thermal deformation and stress corrosion.

3. Can blinds with sealing rings be used in high-pressure systems?

Yes, provided that the sealing ring material corresponds to the operating conditions (temperature, chemical environment, and pressure) and that reliable seating within the flange connection is ensured.

Comments

Comment 1: Can a blind be reused?

Threaded and flanged blinds can generally be reused if operating conditions are respected. Welded blinds are typically single-use components.

Comment 2: What is the difference between a blind flange and a flange blind?

A blind flange is a solid flange without a central bore used to close a pipeline. A flange blind may refer more broadly to various flange-based sealing elements, including detachable or rotating designs.

Comment 3: Can a blind serve as a permanent pipeline element?

Yes. In some cases, a blind is installed permanently, especially if a pipeline section was originally designed as a reserve branch or for possible future connection.