Sanitary Stainless Steel Straight Welded Sight Glass
The Straight Welded Sight Glass is engineered for precision and durability in hygienic applications.
Why Engineers Specify This Item
- The high-transparency borosilicate glass provides clear visual monitoring of fluid flow, ensuring operational efficiency and safety.
- Constructed from 304 or 316L stainless steel, it ensures corrosion resistance and compliance with AS, BS, 3A, SMS, and DIN standards, meeting FDA, 3A, and CE certifications.
- Its quick-release tri-clamp design allows for easy installation and maintenance, minimizing downtime in critical processes.
- The fully welded structure eliminates crevices, making it ideal for pharmaceutical and food processing industries where sanitation is paramount.
What It Prevents
- Lines opened just to check whether product is flowing or has fully drained
- Glass held by a gasket arrangement that leaves a crevice at the seat
- Dark vessels where nothing is visible through the port without a torch
Technical Data
Figures below are the catalogue range for this item. Exact dimensions are confirmed in writing against the standard you work to before production.
| Material | SS 304 or SS 316L for option |
|---|---|
| Media | Water, oil, milk, beverage, sanitary fluid etc |
| Connection | Butt-Welded, Thread, Clamped, Flange |
| Size Range | 1"-6" |
| Pressure | 0-20Bar |
| Working Temperature | -20 C to 120 C |
| Standard | AS, BS, 3A, DIN, SMS, ISO |
| Gasket | EPDM/SILICON/PTFE/VITON |
| Certification | 3A, FDA, CE |
Materials
- SS 304
- SS 316L
Manufacturing Process
- Machining
- Forming and welding
- Interior polishing
- Assembly
- Quality inspection
Quality Control
- Dimensional check against the standard stated on the order
- Surface finish verified against the specified Ra figure
- Visual and leak inspection before packing
- Material certificates to EN 10204 3.1 available on request
Where It Is Installed
- Confirming a transfer line has fully drained before CIP
- Watching colour change during a blend
- Checking for foam or air entrainment on a pump discharge
- Lit observation into a fermentation or storage vessel
Who Buys It
- Operators verifying flow, colour, clarity and drainage in real time
- QA teams checking that a line is empty before a changeover
- Plants automating a process that still needs visual confirmation
What It Is Built To
- 3A
- FDA
- CE
What We Can Change
- Non-standard sizes made to your dimensions
- Special connection types and mixed-standard ends
- Customised surface finish down to Ra 0.4 um
- Seal material selected for your media and CIP cycle
How It Compares
Compared with Sanitary Manways
Specify the Sanitary Stainless Steel Straight Welded Sight Glass where the duty is what this category is built for: inline and tank mounted sight glasses so operators can see the product without breaking into the line. Move to sanitary manways instead where the requirement is round, square, oval and pressure manways that give safe access into a tank and still hold the vessel rating.
Compared with Sanitary Spray and Cleaning Balls
Specify the Sanitary Stainless Steel Straight Welded Sight Glass where the duty is what this category is built for: inline and tank mounted sight glasses so operators can see the product without breaking into the line. Move to sanitary spray and cleaning balls instead where the requirement is fixed and rotating CIP devices that put cleaning solution on every internal surface of a tank.
Compared with A general industrial equivalent
An industrial-grade part of the same nominal size is usually cheaper and carries no declared hygienic surface finish, no crevice-free joint geometry and no material certificate. On a product contact line that difference shows up at the first swab test, not on the purchase order.
Installing and Living With It
Bring the two ferrule faces square before closing the clamp. Fit the gasket dry and seated in the groove, then tighten the clamp evenly; overtightening extrudes the gasket into the bore.
Purge the bore with inert gas before welding and keep heat input low so the heat affected zone does not discolour. Polish the internal weld to the finish specified for the rest of the line.
Do not use tape or sealant on a hygienic union thread. The seal is made by the gasket at the liner seat, not by the thread, so check the gasket is seated before tightening the nut.
Align the flange faces parallel before drawing the bolts up, and tighten opposite pairs in stages so the gasket is loaded evenly across the face.
Keep the duty inside the stated working temperature range of -20 C to 120 C. Running a CIP cycle hotter than the seal material allows is the most common cause of early failure on this item.
Do not exceed the 0-20Bar working pressure. Where the line sees pressure pulsation, specify a heavy duty or bolted clamp at the joints either side.
Record the standard, size, material and seal material fitted, so the replacement ordered in two years matches what is installed today.
Others in the Sight Glasses Range
Industries This Item Serves
Related Capability
Sanitary Stainless Steel Straight Welded Sight Glass FAQ
What we are asked before this item is ordered.
What sizes is the Sanitary Stainless Steel Straight Welded Sight Glass available in
The catalogue range is 1"-6". Dimensions follow the AS, BS, 3A, DIN, SMS, ISO standards. Confirm the tube outside diameter and wall thickness you work to when you enquire and we will match the exact dimensions before production.
Which material should I specify for the Sanitary Stainless Steel Straight Welded Sight Glass
Material options are SS 304 or SS 316L. Choose 316L where chlorides are present or where the item will be welded into a line that has to be validated; 304 is adequate for neutral product and standard caustic CIP. Material certificates to EN 10204 3.1 are available on request.
Which seal material suits my cleaning cycle
The Sanitary Stainless Steel Straight Welded Sight Glass is supplied with EPDM/SILICON/PTFE/VITON sealing options. EPDM is the default for hot water and caustic CIP, silicone for high temperature steam contact, PTFE for aggressive chemicals and Viton for oils and fats. Tell us the media and the peak CIP temperature and we will specify it on the order.
What is the lead time and minimum order for this item
Standard catalogue items such as the Sanitary Stainless Steel Straight Welded Sight Glass are typically 7-15 days, and small quantity orders of standard items are accepted. Custom sizes, special connections and bulk quantities are quoted with a confirmed date before production starts.
Quote the Sanitary Stainless Steel Straight Welded Sight Glass
Send the size, media, working pressure, temperature and the standard you work to. We confirm dimensions, material and finish in writing before quoting.