Transparent

No Type A/B Type A Type B/H Type TA-28 D   S D   S D   S D   S 0 95 x 24 95 x 30 95 x 34       I 115 x 24 115 x 30 115 x 34 133 x 47 II 140 x 24 140 x 30 140 x 34 158 x 47 III 165 x 24 165 x 30 165 x 34 183 x 47 IV 190 x 24 190 x 30 190 x 34 208 x 47 V 220 x 24 220 x 30 220 x 34 238 x 47 VI 250 x 24 250 x 30 250 x 34 268 x 47 VII 280 x 24 280 x 30 280 x 34 298 x 47 VIII 310 x 24 320 x 30 320 x 34 338 x 47 IX 320 x 24 340 x 30 340 x 34 358 x 47 X 340 x 24 370 x 30 370 x 34 378 x 47 XI 360 x 24 400 x 30 400 x 34       XII 370 x 24 430 x 30 430 x 34       XIII 400 x 24 460 x 30 460 x 34       XIV 430 x 24 500 x 30 500 x 34         D = length, S = width  All dimensions are given in mm.  Standard thickness G: 0,10 - 0,15 mm / 0,13 - 0,17 mm0,15 - 0,20 mm / 0,18 - 0,20 mm0,20 - 0,30 mm / 0,30 - 0,40 mm The above table does not reflect the full range of shields. We also provide mica shields in different sizes according to customer requirements. Please contact us.   How to install mica shields ? Designation of elements: 1.        Graphite gasket2.        Mica shields3.        Transparent glass4.        Gasket5.        Nut6.        Body7.        Screw8.        Cover9.        Protective pad10.      Mica shield with a hole   Mica quality classification based on visual properties Depending on quality, in D-351 ASTM standard, there are 12 categories of mica sheets (note: some companies use their own classifications, which may contain a different number of categories). Bellow are described the various categories (form V-1 to V-10A) in accordance with the specifications of ASTM, also used in our company. A lower number of category means, generally speaking, the better the quality of the mica plate.   Cate-gory Name Description V-1 Clear  Hard, of uniform color, nearly flat, free of all stains, foreign inclusion, cracks, and other similar defects. V-2 Clear and Slightly Stained Hard, of uniform color, nearly flat and may contain slight crystallographic discoloration, and very slight air inclusions and not more than one fourth of the usable area. V-3 Fair Stained Hard, of uniform color, may contain slight waves, slight crystallographic discoloration, and slight air inclusions and not more than one-half of the usable area. V-4 Good Stained Hard, of uniform color, may contain medium waves slight crystallographic discoloration, and medium air inclusion in not more than two-third of the usable area. V-5 Stained A Quality Hard, may contain medium air inclusions, uniformly distributed in the usable area; slight green vegetable stains, medium waviness, and heavy waves if specified. V-6 Stained B Quality Hard, may contain heavy air inclusions and heavy waves, medium green vegetable stains, slight black and red dots (mineral) and clay stains. V-7 Heavy Stained Hard, and may contain heavy air inclusions and waves, slight light black and red dots (mineral), medium cloudy stains, clay stains and green stains (vegetable). Soft, buckles, ridges, and sand blast acceptable if specified. V-7A Densely Stained Hard and soft. May contain heavy waves and air inclusions, cloudy stains. High black and red dots (mineral). Medium black and red stained (mineral), buckles, and ridges. Also, green stain (vegetable type), clay stains, herringbones, and sand blast. V-8 Black Dotted Hard, may contain medium waves, heavy air inclusions, cloudy stains, light black and red dots (mineral), and green stains (vegetable). V-9 Black Spotted Hard, may contain medium waves, heavy air inclusions, cloudy stains, light black and red dots (mineral), and green stains (vegetable type), slight black stains (mineral), and sand blast. V-10 Black Stained Hard, may contain medium waves, heavy air inclusions, cloudy stains, light black and red dots (mineral), green stains (vegetable type), and sand blast, medium black stains (mineral), slight red stains (mineral), and clay stains. V-10A Densely Black and Red Stained  Hard, may contain heavy waves, air inclusion, cloudy stains, light black and red dots (mineral), red stains (mineral), black and red stains (mineral), green stains (vegetable type), and sand blast, very dense black and red stains (mineral), and slight clay stains. Soft if specified.   Detailed specification of each category is contained in the following table, which as a PDF file is available for download.   Standard qualities of mica (acc. ASTM Classification D 351)     V-1 V-2 V-3 V-4 V-5 V-6 V-7 V-7A V-8 V-9 V-10 V-10A Crystallographic discoloration X *D *D *D * * * * * * * * Air inclusions Very slight X * * * * * * * * * * * Slight X X * * * * * * * * * * Medium X X X *E *F * * * * * * * Heavy X X X X X * * * * * * * Cloudy stains X X X X X X *G *H * * * * Light black and red dots (mineral) X X X X X *D *D *H * * * * Black stains (mineral) X X X X X X X *G X *D *G *H Red stains (mineral) X X X X X X X *G X X *D * Black and red stains (mineral) X X X X X X X X X X X * Green stains (vegetable type) X X X X *D *G *G * * * * * Clay stains * * * * * *D *G * X X *D *D Waviness Nearly flat * * * * * * * * * * * * Slight X X * * * * * * * * * * Medium X X X * * * * * * * * * Heavy X X X X X * * * X X X * Hardness Hard * * * * * * * * * * * * Soft X X X X X X S * X X X S Stones and holes X X X X X X X X X X X X Buckles X X X X X X S *G X X X X Reeves X X X X X X X X X X X X Ridges X X X X X X S *G X X X X Tears X X X X X X X X X X X X Cracks X X X X X X X X X X X X Hairline cracks X X X X X X X X X X X X Wedge X X X X X X X X X X X X Tangle sheet X X X X X X X X X X X X Herring bones X X X X X X X * X X X X Sand blast X X X X X X S * X * * *   Symbols Permissible * Not permissible X Permissible only if specified S Few and tiny in 1/4 of usable area A Few in one half usable area B Very dense C Slight D Few in two-thirds usable area E Uniformly distributed F Medium G Heavy H   Mica shields provides the best protection possible, to flat transparent, sight glasses in water and liquid level gauges and columns in high pressure steam boilers. The shields retain basic strength and increase the service life of sight glasses when used at increased steam pressures and high working temperatures.  Mica shields also provide perfect visibility for monitoring the nature or degree of combustion in blast furnaces of steam boilers. Sight glasses in steam boilers are exposed to harsh operating conditions (thermal, mechanical and chemical). On the surface of the glass crystallized deposits of mineral substances interact aggressively on the surface of the glass, especially at higher temperatures and pressures, and depending on the pH of the liquid. This interaction not only leads to tarnishing glass, but also the erosion, manifested by decreasing the thickness of the sight glass, which reduces its strength and may lead to dangerous failure. Glass losses for unprotected sight and gauge glasses, depends mainly on the pH and the temperature of the boiler water, could reach millimeters per month (see. fig. below).   Mica shields should be MANDATORY applied where the steam pressure exceeds 40 bar and the temperature exceeds 200 ° C.  Natural mica has high heat resistance, is transparent; optically clear, flexible, flat and unbreakable. Transparency of mica is unaffected by temperature changes as well as the action of gases and vapors in an environment where it works. In addition, mica is resistant to shock, vibration or deformation and therefore is used as a protection of glass exposed to radiation, mechanical damage and the action of corrosive chemicals.     Typically, mica shields are supplied as complete with gauge glass and seal (here's an example set), but can also be supplied separately. We can also supply plates for non-standard sizes and shapes (see also pages describing Mica windowsand Mica disks in the chapter Our offer/Mica/Natural mica/Mica sheets).         Mica shields provide excellent protection against acids, steam, water, air and oil at high pressure and temperature, and eliminates the risk of cracks, fractures, shock, burning, rinse the glass. Mica shields are made from the highest quality natural transparent muscovite mica (species Rubby Stained A) and supplied in various lengths, thicknesses and widths according to customer needs. Mica as a natural mineral, has a layered structure, but you must not separate these layers ! Thanks to the phenomenon of adhesion, naturally created mica layers guarantee its tightness. Any attempt to interfere (delamination) may cause loss of tightness and a significant reduction in the effectiveness of the mica shields. Before delivery, all mica shields are electronically tested for quality and reliability. They are supplied in individual packages to eliminate scratches and protect them from damage. Operating and maintenance instructions are enclosed with each package.  

  Type A Type B Type H [bar] [°C] [bar] [°C] [bar] [°C] For soft environment,  not affecting aggressive on the glass ie. oils, hydrocarbons, etc. 400 120 265 120 300 120 150 400 180 400 200 400 0 - 10 430 0 - 10 430 0 - 10 430 For aggressive environment acting on the glass, eg. saturated steam, hot water, alkalis 35 243 35 243 42 253     Dimensions: Size TYPE A TYPE B TYPE H L W H L W H L W H 0 95 30 17 95 34 17 - - - I 115 30 17 115 34 17 115 34 22 II 140 30 17 140 34 17 140 34 22 III 165 30 17 165 34 17 165 34 22 IV 190 30 17 190 34 17 190 34 22 V 220 30 17 220 34 17 220 34 22 VI 250 30 17 250 34 17 250 34 22 VII 280 30 17 280 34 17 280 34 22 VIII 320 30 17 320 34 17 320 34 22 IX 340 30 17 340 34 17 340 34 22 X - - - 370 34 17 - - -   Reflex level gauge glasses offered by us are made by a recognized, global companies like Klinger, Maxos, Spectraglass of high-quality borosilicate("extra hard") or aluminosilicate glasses. Glass in the production process is subjected to a polishing and toughening. This results in products characterized by high mechanical strength and high resistance to alkalis, acids and condensates. In the production process is conducted constant and precise control of transparency and the dimensions of manufactured glass. Reflex gauge glasses  are used to read the liquid level directly or with the use of CCTV (industrial television). In this type of glass on the chamber side (medium side) are imprinted longitudinal grooves (3 or 4), which walls are angled to each other at an angle of 90˚. Squeezing process causes the formation of grooves. On the surface of the grooves creates extremely smooth and hard glass layer, very resistant to the environment. With the grooving increases the angle of refraction which makes the visibility of the liquid level is much better than when using smooth glass. For reflective glass does not apply mica shields. Reflex glasses may be used in pressure up to 35 bar. In this area are sufficiently resistant to the environment. The reading is clear and contrast. In the case of factors other than steam reflex glasses may be used up to 400 bar or 400˚C. Depending on the width and thickness there are three basic types of transparent level gauge glasses: type A - width 30 mm, thickness 17 mm type B - width 34 mm, thickness 17 mm type H - width 34 mm, thickness 22 mm In addition, the occasionally encountered also: Type C - width of 20 mm, thickness 12 mm Type D - width 25 mm, thickness 15 mm Reflex level gauge glasses are supplied in sets with gaskets or separately. We offer transparent glass meet the following standards: ÖNORM M 7354 (Austrian standard) DIN 7081 (German standard) JIS B 8211 (Japanese standard) ÖMV-Spez. H 2009 (factory standard of the Austrian petrochemical concern ÖMV-AG, Vienna) MIL-G-16356 D (regulations the US Navy) Esso Eng. Spec. 123 (Esso Research and Engineering Co. - New Jersey) S.O.D. Spec. 123 (Standard Oil Development Company - New Jersey) BS 3463 (British Standard) Note: transparent level gauge glasses are supplied in sets with gaskets or separately. If you can not find the size - please contact us.   While every attempt has been made to verify the source of the information, no responsibility is accepted for accuracy of data.

Material: Base and top frame:  1.4571; 1.4404, 1.4462, RSt 37-2 / H II / Other materials on request Screws:  A4-70 Seals: depending on the application Glass:  Reflections -or- Transparent glass according to DIN 7081 or DIN 8903 Shape:  Rectangular Sight Glass as level indicator for visual inspection of tanks, boilers and silos Nominal size: size from 140 mm up to 1000 mm  Other sizes on request Nominal pressure: PN 16 or PN 40 For operating pressures up to max. 35 bar depending on the model Temperature:  temperature: 100 ° C or 243 ° C depending on the glass and seal selection. Special Feature: Lloyd’s Register Design Approval available Options: Optional versions are possible. Gasket selection: PTFE (200°C) FKM (200°C) NBR (100°C) C4400 (150°C) Silicone (200°C) EPDM (140°C) Graphite (320°C) Installation instructions: After welding in the base flange, check whether the sealing surfaces have warped! If necessary, rework must be carried out. The operating pressure does not apply to the base frame, which must be checked together with the pressure device according to AD data sheet B9! BL = overall length / SL = visible length BL SL Concealed view Kg(16 bar) Kg(35 bar) 140 79 0 2,8 3,4 170 124 0 3,2 4,0 220 174 0 4,0 5,0 250 204 0 4,6 5,7 300 264 0 5,3 6,7 310 264 0 5,6 7,0 350 304 0 6,3 7,8 370 324 0 6,6 8,2 400 354 0 7, 8,9 500 454 1x46 9,1 11,4 600 574 1x46 10,7 13,4 620 574 1x46 11,1 13,9 700 654 1x46 12,5 15,7 740 694 1x46 13,2 16,5 800 74 1x46 14,2 17,8 930 884 2x46 16,7 20,9 1000 954 3x46 18,2 22,8   SHORT DESCRIPTION - SIGHT GLASS LEVEL INDICATOR The ACI level indicator Type 330 is an easy to mount fitting for the industrially proven borosilicate sight glass plates according to DIN 7081. The base flange of Type 330 is set into the wall of a container or pipe and is fixed all-round with a welding seam. The base flange has an indentation for glass and seals, which are held by a cover flange. Type 330 only needs a very low torque for the fixing screws, whilst still achieving very reliable sealing. Type 330, like most of our fittings, is available in a range of materials, including standard types of container steel such as S235, or standard stainless-steel alloys such as 1.4571 or 1.4404, but high-performance materials such as Hastelloy or duplex alloys are available on request. For the sealing, we use tried and tested high-quality flat seals from well-known manufacturers such as KlingerSIL C4400 or novaphit MST. It is also possible to supply pure PTFE seal plates and soft seals such as NBR or EPDM directly. The industry norm DIN 7081 includes the use of sight glasses of different lengths in the “Transparent” and “Reflex” versions. Transparent glass means simple, smooth glass plates. This type can, should the operating conditions require it, be fitted with protective layers made of mica or other materials such as KEL-F. We recommend the reflex type, if operating conditions allow it, for use with clear, colourless liquids. Due to the grooves contained in this type, the meniscus in the liquid phase can be seen clearer than with the transparent variety. Read on for technical data and detailed views.