Circular sight glass fitting type 390 PN 16/320 with welding ends according to DIN EN 1092-1 type 11

Nuts Stud bolts Cover flange Glass cushion Sight glass Gasket Base flange Our round sight glasses type 320 are welded on or in a container wall to allow for observation or illumination of the inside of the container. A sight glass made of chemically highly resistant borosilicate glass DIN7080 is clamped between two high-quality stainless steel flanges and proven quality seals.  Beyond the definitions of DIN 28120, we also offer type 320 in special sizes of DN 250 and DN 300. These sizes, not specified in the standard, have also been constructed in accordance with DIN 28120.  Our sight glasses type 320 are made from high-quality stainless steel 1.4571 (316Ti), which our customers have appreciated for years. The glass material used is the tried-and-tested borosilicate glass according to DIN 7080 (or according to customer specifications).  The sealing of the fitting is done with flat seals tailored to your needs from a comprehensive range of materials. In addition to the common fiber seals, this also offers more demanding materials such as PTFE (Teflon®), NBR, novaphit® MST-XP, KlingerSil® C4400, and many other brand seals. If the maximum operating temperature of borosilicate glass DIN 7080 does not meet your requirements, or if the process conditions pose a problem even for the highly resistant borosilicate glass, a mica protection disk specially adapted for the fitting offers additional protection against temperature and steam. FEP or Halar® coatings additionally protect the borosilicate glass from aggressive chemicals or alkalis. Like other sight glass fittings, type 320 can be equipped upon request with sight glass wiper type SGW and SWII, spray devices SVI, or lights. Cross-sectiondrawing Dimensions DN 25 40 50 80 100 125 150 200 250² 300² Da [mm] 115 150 165 200 220 250 285 340 395 445 Di [mm] 48 65 80 100 125 150 175 225 280 325 h1 [mm] 16 16 16 20 22 25 30 35 40 45 h2 [mm] 25 30 30 30 30 30 36 36 40 45 Glass-Ø [mm] 63 80 100 125 150 175 200 250 300 355 s (PN10) [mm] 10 10 12 15 20 20 25 30 45 45 s (PN16) [mm] 10 12 15 20 25 25 30 - - - Weight (PN 10) [kg] - 5,4 5,9 9,6 11,1 14,3 21,9 30,7 44,7 59,2 Weight (PN 16) [kg] 2,8 5,4 6,0 9,7 11,3 14,6 22,4 - - - 2) Similar to DIN 28120

The method of sizing:   DiameterD [mm] Widths [mm] Pressure[bar] Notes 24 10 150 disc special size 30 12 150 disc special size 15 200 disc special size 31,6 12,75 150 disc special size   Aluminosilicate 33 14 150 disc special size 33,12 15,95   Aluminosilicate 34 17 200 disc special size   Aluminosilicate 35 7 25 disc special size 40 10 40 disc special size 12 50 disc special size 44 10 40 disc special size 12 50 disc special size 45 10 40 acc. DIN 7080 12 50 acc. DIN 7080 50 10 25 acc. DIN 7080 12 40 acc. DIN 7080 55 6,5 6 disc special size 10 25 disc special size 60 10 16 acc. DIN 7080 12 25 acc. DIN 7080 15 40 acc. DIN 7080 20 95 disc special size 63 8 8 disc special size 10 16 acc. DIN 7080 12 25 acc. DIN 7080 15 40 acc. DIN 7080 65 10 12 disc special size 15 40 disc special size 70 12 16 disc special size 15 25 disc special size 75 12 16 disc special size 80 10 10 disc special size 12 16 acc. DIN 7080 15 25 acc. DIN 7080 20 40 acc. DIN 7080 86 12 10 disc special size 90 10 8 disc special size 92 10 8 disc special size 94 12 10 disc special size 95 10 6 disc special size 15 16 disc special size 100 10 7 disc special size 12 10 disc special size 15 16 acc. DIN 7080 20 25 acc. DIN 7080 25 40 acc. DIN 7080 105 15 16 disc special size 110 12,5 10 disc special size 20 25 disc special size 113 15 10 disc special size 115 15 10 disc special size 120 10 4 disc special size 15 10 disc special size 18 16 disc special size 125 15 10 acc. DIN 7080 20 16 acc. DIN 7080 25 25 acc. DIN 7080 30 40 disc special size 130 15 10 disc special size 135 15 8 disc special size 25 25 acc. DIN 7080 140 15 8 disc special size 150 10 2 disc special size 15 8 disc special size 20 10 acc. DIN 7080 25 16 acc. DIN 7080 30 25 acc. DIN 7080 160 20 12 disc special size 170 15 5 disc special size 20 10 disc special size 175 20 10 acc. DIN 7080 25 16 acc. DIN 7080 30 25 acc. DIN 7080 200 20 8 acc. DIN 7080 25 10 acc. DIN 7080 30 16 acc. DIN 7080 210 25 10 disc special size 250 20 4 disc special size 25 8 acc. DIN 7080 30 10 acc. DIN 7080 265 30 8 acc. DIN 7080   Note: if in the column Notes otherwise stated, borosilicate glass "extra hard" is used Round sight glasses are delivered separately or in a set with gaskets and mica shield. If you can not find the size - please contact us. Tolerances Diameter (d1):d1 ≤ 125 mm125 mm < d1 ≤ 200 mm d1 > 200 mm  ± 0,5 mm± 0,8 mm± 1,0 mm     Thicknes (s):s ≤ 20 mm s > 20 mm  + 0,5 mm / -0,25 mm+ 0,8 mm / -0,40 mm  Flatness (e):d1 ≤ 100 mm100 mm < d1 ≤ 150 mm 150 mm < d1 ≤ 200 mmd1 > 200 mm 0,05 mm0,08 mm0,12 mm0,15 mm    Parallelity (p):d1 ≤ 100 mm100 mm < d1 ≤ 200 mm d1 > 200 mm 0,20 mm0,25 mm0,30 mm Calculation of the glass thickness s - theoretical minimum glass thicknes [mm] dm => (d1+d2)/2 => average sealing diameter [mm]d1 - glass and sealing outside diameter [mm]d2 - sealing inside diameter [mm]p - permisible presure [bar] δbB - min. value of surface comressive stress [N/mm2] S - safety factor        Our offer includes sight glasses made of various materials, depending on environmental conditions (temperature, pressure, aggressive media). The properties of various glass materials are described on page Types of materials in chapter Our offer/Technical glass. The basic types of materials used for the manufacture of sight glasses are: soda-lime glass - widely available, cheap, working temperature up to 280 °C,  borosilicate glass - particularly suitable for use in aggressive environments (acids, alkalis, water vapor), working temperature up to 350 °C, aluminosilicate glass -  working temperature up to 660 °C, glass-ceramics - thermal shock resistant, working temperature up to 750 °C, quartz glass - with a broad spectrum light transmittance (from ultraviolet to infrared), working temperature up to 1100 °C, sapphire products - working temperature up to 2000 °C. To improve the strength, the machined glass is subjected to toughening and annealing. In order to increase the resistance of sight glasses on the aggressiveness of the working environment and in the use of high temperatures and pressures, additional use of mica shield is recommended. Mica disc working as shields are described here.  If you need this solution - please contact us. Round sight glasses are delivered separately or in a set with gaskets. Gaskets for sight glasses are described here. We offer sight glasses manufactured by leading brands such as: Spectraglass, Klinger or Maxos, which guarantees high quality and stability of parameters.   Safety precautions when using sight glass discs: Whenever a sight glass assembly has been taken apart it is urgently recommended in accordance with DIN 7080/ DIN 8902 that the glass disc and gaskets are replaced by new ones. That is particularly important in the case of pressure vessels and/or aggressive media. The following extract from DIN 7080/DIN 8902 text is verbatim: Sight glass discs may only be installed by personnel who have been informed fully about the following requirements: care in handling sight glass discs cleaning of recesses, sight glass discs, gaskets and other parts i. e. removal of foreign bodies (e. g. swarf), prior to installation/reassembly even tightening of retaining bolts Sight glass discs that have been removed after operating use must not be re used. Planned maintenance:Sight glass discs should be included in routine maintenance and periodically checked visually or using ultrasound wall thickness measuring means. In the event of damage, a glass disc must be promptly exchanged, with the plant first having been brought to a standstill. The service life of a sight glass, relative to the particular vessel in which it is mounted, should be established by regular and careful visual check of its condition.Caution: Completely demineralised water may dissolve glass – especially intensive periodical inspection required! Breakage of a sight glass:In spite of careful installation and recommended use, sight glass discs can, on rare occasions, suffer breakage through external influences. In order to prevent the entry of glass particles into products of a critical nature, e. g. foodstuffs, appropriate safety precautions should be taken by the plant manufacturer or user.