A clear, circular optical lens with two concentric rings.

A smooth, transparent glass or acrylic object resembling a rectangular prism with rounded edges.

A clear circular ring with a hollow center.

Clear acrylic circular object with a central hole, resembling a lens or magnifier.

A stainless steel flange with transparent glass sections, secured by several bolts for industrial use.

A stainless steel flange with bolts, featuring a smooth surface and a central opening for joining pipes.

Glass ring tubular sight glass type 640A Class 150

Intermediate sight glass design for flanges according to ASME B16.5

Google reviews for aci24.com

Available from stock

Intermediate tubular sight glass ASME

Datasheet

Certified quality

Technical data

Nominal sizes NPS

½“
¾“
1 ¼“
1 ½“
2 ½“
3“
4“
5“
6“
8“

Pressure rating Class

150 lbs

Temperature

80°C
130°C
150°C
175°C
180°C
200°C
280°C

Options

FEP protective screen / coating
Custom made design lengths

Quick overview

max. 20 barg

heat resistant up to 280 °C

for liquid media

for gaseous media

Nominal sizes
NPS 1/2" - 20"

custom made designs available

Cross-section
drawing

Dimensions

NPS	1/2“	3/4“	1“	1 1/4“	1 1/2“	2“	2 1/2“	3“	4“	5“	6“	8“	10“	12“	14“	16“	18“	20“
Di [mm]	16	21	27	35	41	53	63	78	102	128	154	203	255	305	336	386	437	487
Da [mm]	35	43	51	63	73	92	105	127	157	186	216	270	324	381	413	470	534	584
Gew.¹ ³	0,09	0,13	0,18	0,26	0,34	0,53	0,77	0,95	1,34	1,72	2,16	2,99	3,77	4,91	5,2	6,5	8,5	9,4
Gew.² ³	0,04	0,07	0,09	0,13	0,17	0,26	0,33	0,47	0,66	0,84	1,06	1,47	1,85	2,42	2,67	3,33	4,36	4,81
PS¹ ⁴	20	20	20	20	20	20	20	20	20	19	16	15	10	10	10	10	10	10
PS² ⁴	19	18	16	16	16	16	14	14	10	10	8	8	6	6	6	6	6	6
¹Borosilicate glass ²Acrylic glass ³Weight in [kg] for L = 50 mm ⁴max. operating pressure in [barg] Other materials, sizes, lengths and flange standards available on request

Product information

Type 640A is designed for a working pressure of up to 20 barg and can be easily mounted between flanges according to ASME B16.5 Class 150 lbs RF. Due to its compact design, this model is ideally suited for retrofitting existing systems – even in tight spaces. Even with larger nominal sizes, working pressures of 20 barg and more can be achieved with type 640A.

The standard version with borosilicate glass is suitable for working temperatures of up to 280 °C.

WN-Flange Class 150 lbs RF according to ASME B16.5
Gasket
Glass ring tubular sight glass type 640A
Gasket
WN-Flange Class 150 lbs RF according to ASME B16.5

Exploded view of a mechanical flange assembly, including bolts, washers, and a seal.

Would you like personal advice?

Benefit from our expert knowledge in process monitoring. Our experienced team will provide you with sound advice when selecting the ideal sight glass fittings for your specific requirements. Schedule your personal consultation now!

Dirk Göttgens

Executive management

0049 (0) 2461 91634 00

dg@aci24.com

Go to contact form

Accessories

FEP protective screen / coating

To protect the sight glass plates from chemical influences