Liquid Level Gauges

Pipe Sight Glass — SV-Series

Name: Pipe Sight Glass — SV-Series
Brand: Sightflow

Weld-in sight glass for 6-inch or 8-inch pipes

The SV-Series is a cost-effective solution for 6-inch or 8-inch pipes, providing an oblong viewing window with a curved pad flange for welding into a vessel or pipe. Two standard lengths and optional materials are available.

SV-Series — Front view

SV-Series — Side view

Technical data

Operating limits and sizes

Application: Welding-in vessel type; low-pressure systems
Pipe curvature: 6 in or 8 in
Pressure limit: Up to 40 bar, depending on requested size
Temperature limit: Up to 280°C
Sections: 1
View width: 35 mm
Visible length: 175 mm (A1) or 260 mm (A2)
Pad width: 67 mm (A1) or 80 mm (A2)

Confirm the pressure rating for the selected size and service.

Materials

Body (Pad flange): SS304 or SS316
Sight glass: Tempered borosilicate glass, transparent
Cover: SS304
Bolts: SS304; others on request
Gaskets: Non-asbestos standard; Teflon on request

The ordering chart also lists reflex glass. Confirm the selected glass type and any optional materials with Sightflow.

Dimensions and construction

Dimensions in millimetres unless noted. Both views describe the same assembly; the table below lists each length and pipe-curvature combination.

SV-Series front drawing with W1, W2, L, V2 and V1 dimension labels — **Front view — Lengths L, V1, V2; widths W1, W2**

SV-Series section with A, B, C and D dimensions, numbered parts 1 to 6 and 6-inch or 8-inch pipe curvature callout — **Section view — A, B, C, D and parts 1–6**

SV-Series dimensions
Dimension / detail	SV-A1-6	SV-A1-8	SV-A2-6	SV-A2-8
Pipe curvature	6 in	8 in	6 in	8 in
Total length L (±5 mm)	220	220	318	318
Visible length V1	175	175	260	260
Glass length V2	190	190	280	280
Pad flange B × C	24 × 67	24 × 67	24 × 80	24 × 80
Cover thickness A	15.8	15.8	19.1	19.1
D	35	35	35	35
Number of bolts	10	10	10	10
Bolts W	51	51	51	51
Number of sections	1	1	1	1

The PDF does not supply weights or separately tabulate W1 and W2. Dimension letters are retained as printed; no missing values have been inferred.

Parts list — Numbers match the section view
No.	Part	Material
1	Pad flange	SS304 or SS316
2	Sight glass	Tempered borosilicate glass
3	Cover	SS304
4	Gasket	Non-asbestos, 3 mm thick
5	Gasket	Non-asbestos, 3 mm thick
6	Bolt, M10	SS304

Ordering information

Choose your options to build an enquiry reference.

For other pipe curvatures or custom dimensions, contact Sightflow.

Specifications are general selection guidance. Confirm materials, connection standards, operating temperature and pressure with Sightflow before placing an order.