Scraper Sight Glass: A Observation Tool for Ensuring the Work Safety & Quality of Industrial Containers

Scraper sight glass is a kind of flat sight glass, also known as a scraping plate sight glass or brush sight glass. It is commonly used in petroleum, chemical, food and other industries. It is primarily used to observe and monitor the working reaction of the medium inside the containers to ensure production safety and product quality.

The unique scraper design allows it to be applied in media with high viscosity. It effectively cleans the surface of the sight glass from substances and deposits without stopping the machine or affecting the production progress. This not only ensures a clear observation field, but also improves the production efficiency. Additionally, the sight glass is made from corrosion-resistant materials, allowing it to adapt to various working environments with different mediums. We can also customize the size and shape of the container according to your requirements to meet specific process needs.

Scraper sight glass

Features

Compact structure. Elaborate design and small footprint.
Enhanced efficiency. You can use the handle to clean the dirt on the glass directly without interrupting the work.
Good sealing performance. High-quality sealing materials are adopted to ensure good sealing performance of the equipment under various working conditions.
Low temperature resistance. It can work normally even in low temperature and have good anti-freezing performance.
Safe and reliable. It undergoes strict quality control and testing to ensure the stability and reliability of the equipment.

Technical Data

Body material: carbon steel WCB, stainless steel 304, 316, 316L
Window material: tempered borosilicate glass, quartz glass
Seal material: NBR, PTFE, high temperature graphite
Operating pressure: 0–2.5 MPa
Operating temperature: 0–550 °C (Asbestos gasket or PTFE gasket is enough for ambient working temperature within 280 °C; graphite gasket is recommended when the ambient working temperature exceeds 500 °C. Note: The thicker the glass, the thickness of the gasket should be increased accordingly.)

Specification

A simple scraper sight glass drawing with marks

PGT-03: Precision glass tube is used as syringe with a piston.

Table 1: Specifications of Scraper Sight Glass
d1 mm	SG mm	D mm	H1 mm	H2 mm	K mm
80	95 × 10	126	10	16	110
100	115 × 12	146	10	16	130
130	15 0× 15	182	10	16	166

Features and advantages

Stable chemical property and easy to clean
Glass material have the advantages of anti-corrosion and easy to clean and maintain.
Tight tolerance
We are specialized in manufacturing optical glass for more than 10 years and we can control the tolerance according to your requirements. In some precision application, we can minimize the tolerance into very tiny figure.
Surface covering
Surface covering can help in anti-reflection and filtering.

The destination of flatness, power and irregularity.

OG-02: The second lens power is λ/4 and flatness is λ/10.

Precautions

To ensure the safe transportation of the brush sight glass, the scraper assembly is debugged on the lens, and then disassembled and packaged separately for shipment. The user should assemble the scraper assembly first after welding the edge flange and then install the lens.
Cleaning treatment. Before use, you can lightly wipe the surface with a sufficient amount of alcohol cotton. Avoid using acid-containing liquids for cleaning, so as to not to corrode the outer surface of the glass and scraper.
Choose the right gasket. Asbestos gasket or PTFE gasket is enough for ambient working temperature within 280 °C; graphite gasket is recommended when the ambient working temperature exceeds 500 °C. Note: The thicker the glass, the thickness of the gasket should be increased accordingly.
Apply force evenly. During installation, avoid applying excessive force. It is recommended to tighten the screws evenly in a diagonal way.
Regular inspections. When the sight glass installation is finished, regular inspections must be carried out, especially in environments with acidic or alkaline liquids. It is important to regularly check the degree of corrosion on the glass surface to ensure safety.

Maintenance & Care

Sight glass is a reaction equipment used to observe the flow of media such as liquids, gases and steams. The window glass should be kept clean and dust-free.
The window glass of the sight glass is a fragile part, so it should be handled with care during installation.
The temperature and pressure resistance of the sight glass are limited. Temperature resistance: borosilicate glass ≤ 250 °C, quartz glass ≤ 800 °C. Pressure resistance: borosilicate glass ≤ 2.0 MPa, quartz glass ≤ 4.0 MPa, ordinary soda-lime glass < 0.6 MPa.
Allowable rapid temperature change < 60 °C, the glass will be ruptured due to excessive temperature difference.

Applications

Weakly corrosive materials in chemical and petrochemical production, such as water, ammonia, oils, hydrocarbons, etc.
Strongly corrosive materials in chemical production, such as caustic soda, concentrated and dilute sulfuric acid, carbonates, acetic acid, esters, etc.
Low-temperature materials in refrigeration, such as liquid methane, liquid ammonia, liquid oxygen, and various refrigerants.
Materials with hygiene requirements in light industry, food, and pharmaceutical production, such as beer, beverages, dairy products, granular pharmaceuticals, etc.

The application of scraper sight glass in the pharmaceutical industry

For pharmaceutical industry

The application of scraper sight glass in the reactor

For chemical production