Borosilicate glass sight glass Type 640A

level indicatorfor industrial applicationsflange

Tubular sight glass Type 640A Class 150 is an intermediate tubular sight glass designed for flange mounting according to ASME B16.5. Its compact design is suitable for retrofitting existing systems and tight spaces while allowing working pressures up to 20 barg and temperatures up to 280 °C (standard borosilicate glass).

Nominal sizes (NPS)

• ½″
• ¾″
• 1″
• 1 ¼″
• 1 ½″
• 2″
• 2 ½″
• 3″
• 4″
• 5″
• 6″
• 8″

Pressure rating Class

• 150 lbs

Temperature options (standard selections)

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

Options

• FEP protective screen / coating
• Custom-made design lengths

Dimensions and technical table (selected data from drawing)

• Nominal sizes covered: NPS 1/2″ – 20″ (table shows up to 20″)
• Inner diameter (Di) [mm]: 16; 21; 27; 35; 41; 53; 63; 78; 102; 128; 154; 203; 255; 305; 336; 386; 437; 487
• Outer diameter (Da) [mm]: 35; 43; 51; 63; 73; 92; 105; 127; 157; 186; 216; 270; 324; 381; 413; 470; 534; 584
• Weight (borosilicate) [kg] for L = 50 mm: 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
• Weight (acrylic) [kg] for L = 50 mm: 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
• Max. operating pressure (barg) per NPS (table excerpt): 20; 20; 20; 20; 20; 20; 20; 20; 20; 19; 16; 15; 10; 10; 10; 10; 10; 10
• Alternative per-material max. operating pressure (second PS row): 19; 18; 16; 16; 16; 16; 16; 14; 14; 10; 10; 8; 8; 6; 6; 6; 6; 6
• Notes: 1 = Borosilicate glass (standard), 2 = Acrylic glass; weights are for L = 50 mm; other materials, sizes, lengths and flange standards available on request

Characteristics / technical specifications

• Model: Type 640A
• Manufacturer: ACI Industriearmaturen GmbH
• Flange mounting: designed for WN-flange Class 150 lbs RF according to ASME B16.5
• Max. working pressure: up to 20 barg (depending on nominal size)
• Standard glass material: Borosilicate glass (suitable up to 280 °C)
• Alternative material: Acrylic glass (lower weight, different pressure ratings)
• Operating temperature (standard): up to 280 °C (borosilicate)
• Intended media: liquid and gaseous media
• Nominal sizes range: NPS 1/2″ – 20″ (dimensions and weights provided in table)
• Available options: FEP protective screen/coating; custom lengths and special designs