Sight Glasses are designed for use with Hydrogen Sulfide.

Press Release Summary:

Designed for Hydrogen Sulfide (H2S) service at temperatures from -60 to +426°C, H2S sight glasses are constructed from corrosion resistant materials without use of exotic diamond-amorphous coating techniques. C-276 Hastelloy housing features C-Axis Sapphire windows and internal, all-metal C-seal made from INCONEL® Alloy 718. Exhibiting optical clarity, glasses allow non-distorted viewing of process behind window while withstanding up to 5,000 psi (internal) and 580 psi (external).

Original Press Release:

Encole LLC Introduces Sight Glasses for use with Hydrogen Sulfide

San Jose, California

Encole LLC introduces sight glasses specifically designed for Hydrogen Sulfide, H2S service at high temperature. Typically uses include sour refinery process, petroleum and natural gas refining, paper and pulp plants, Rayon textile manufacturing, waste disposal equipment.

The H2S sight glasses are constructed from the most corrosion resistant materials practically available, without the use of exotic diamond-amorphous coating techniques. The housing is made from commercially available C-276 Hastelloy, an industry standard for corrosion-proof process components, C-Axis Sapphire windows, and an internal all metal C-seal made from INCONEL® Alloy 718. The seal is heat treated by the Solution and Precipitation (NACE) method for sour gas H2S service. The advantage of these Encole sight glasses is the excellent optical clarity not available in fused type sight glasses. Encole sight glasses allow non-distorted viewing of the process behind the window, while retaining the high-pressure and high temperature performance and corrosion resistance.

H2S sight glasses have the following technical parameters:

• Operating Pressure: up to 5,000 psi, internal pressure, 580 psi external pressure,

• Operating Temperature: -60 ºC to +426ºC

• Available in NPT-threaded configuration, Sizes 1” to 3” in ½” increments. Custom sizes and flanged configurations are available by custom order.

About Encole LLC

Encole LLC is an American company providing engineering, marketing and sales support to manufacturers of industrial components. The Company is developing an online directory of technical products found at For information about sight glasses, distributorship opportunities and adding products to the catalog or the Company products and services, contact Encole LLC. Telephone: 408.514.5838. Email:

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