NA Connection Fused Sintered Flange Sight Glass | BL-NASJFL-XX

NA Connection Fused Sight Glass | BL-NASJFL-XX

The BL-NASJFL-XX is Borlan Fluid’s NA connection fused sight glass: a glass-to-metal observation window with a raised profile that is fastened to a matching NA flange with bolts. It provides a viewing point for a vessel or process connection when the selected flange, seal and installation details match the equipment drawing. In the Borlan catalog, BL-NASJFL-XX identifies the fused window assembly; the companion BL-NAFL-XX identifies the NA flange. Please specify whether your inquiry is for the window, the mating flange or a reviewed combination.

How the NA Connection Works

The 2025 Borlan catalog describes this series as a raised-profile fused sight glass joined to an NA flange by screws. The glass and stainless-steel window body are fused into one viewing component; the bolted joint and its soft sealing interface connect that component to the matching flange. This makes the fused observation window different from a plain NA flange, a clamp sight glass or a complete sight light with an electrical lamp.

• Model: BL-NASJFL-XX; XX denotes the selected catalog size.
• اتصال: bolted connection to a compatible NA flange.
• Viewing surface: fused glass-to-metal construction with the flatter process-side profile illustrated in the catalog.
• Supply scope: confirm the observation window, mating flange, soft seal and fasteners on the quotation and approved drawing.

Catalog Dimensions

The table below transcribes the BL-NASJFL-XX dimensions from the Borlan 2025 catalog. All dimension values are in millimeters. The drawing labels are retained exactly so they can be checked against a mating NA flange. A catalog size is a selection starting point; the approved drawing governs fabrication and installation.

Catalog reference only. Confirm bolt pattern, mating dimensions, seal geometry, material, allowable pressure, temperature and vacuum requirements against the approved size-specific drawing before ordering.

Selection and Installation Notes

For an NA connection sight glass, the metal interface matters as much as the visible opening. Send the existing flange drawing or the catalog size you need, plus the vessel connection details. Borlan can then check the matched dimensions and define the complete supply scope in the quotation. The catalog calls for a soft seal at the contact surface and advises keeping heating and cooling rates to no more than 2–3°C per minute for fused sight glass products. Use the project-approved sealing and tightening procedure; do not infer a bolt torque or a pressure rating from the product photograph.

For pharmaceutical, food, beverage or chemical equipment, share the actual cleaning medium, operating cycle and contact-material requirements. Application suitability, stainless-steel grade, surface finish, pressure, temperature and documentation are confirmed for the selected configuration rather than assumed across the series.

الأسئلة الشائعة

Is BL-NASJFL-XX the same as an NA flange?

No. BL-NASJFL-XX is the NA connection fused observation window. BL-NAFL-XX is the companion NA flange listed separately in the catalog. Ask for the exact assembly scope you need.

Can I select a size from the table alone?

The table helps identify a catalog option, but the existing connection and approved drawing must also match. Share the flange drawing, process opening and required seal details for a fit check.

Does the catalog table set the operating pressure or temperature?

No. The values above describe geometry. State your working and design conditions in the inquiry so the applicable size and configuration can be reviewed.

Request a Matched NA Sight Glass Quote

Send Borlan Fluid your catalog size or connection drawing, required quantity, process medium, pressure and temperature conditions, preferred material, seal requirement and whether you need the mating NA flange and fasteners. We can review a size-specific configuration and provide a clear quotation. Contact Borlan Fluid or explore more fused sight glass products. For additional product footage, visit the Borlan Fluid YouTube channel; availability of a video for this exact model should be checked there.