All Glass items shown in this catalogue are manufactured from borosilicate glass 3.3 are widely used as the basis for the construction of complete process systems all over the chemical, dyestuff, food pharmaceutical, and petrochemical industries. The abbreviation for the coefficient of linear expansion which is (3.3 ± 0.1) x 10-6 K-1 . This is lower than any other industrial glass. Since this glass expands less, the tensile stresses in the glass wall during heating are less, which means that it is able to withstand a greater thermal shock and the maximum working pressure for a given operating temperature is greater.
One reason for this widespread used is the special properties of borosilicate glass 3.3 (see below), complemented by the use of other highly corrosion resistant materials such as PTFE and ceramics.
Resistance to Chemical
Borosilicate glass 3.3 is highly resistant to water, neutral and acid solutions, concentrated acids and acid mixtures, and to chlorine,
bromine, iodine and organic substances. The chemical resistance of this glass is superior to that of most metals and other materials, even when exposed to long processing periods and temperatures above 100°C. At higher temperatures and in more concentrated forms the glass surface is subject to increased attack by hydrofluoric acid, hot phosphoric acid and alkaline solutions.
Properties of Borosilicate Glass 3.3
The very large use of this material throughout the world in the chemical and pharmaceutical industries as well as many other allied areas, is mainly due to its chemical and thermal properties (see also ISO 3585) together with a great number of other benefits that make a distinction borosilicate glass 3.3 from other materials of construction. These include special properties e.g.
- Smooth non-porous surface
- Outstanding corrosion resistance
- No adverse physiological properties
- Neutral smell and taste
- Catalytic inertness
Permisslble Operating Temprature
- Borosilicate glass 3.3 shows no considerable light absorption in the visible area of the spectrum, and consequently it is clear and colorless.
- Borosilicate glass 3.3 in photochemical processes the transparency of ultra violet is of particular importance. It follows from thetransmittance of material in ultra violet region that photochemical reactions e.g. chlorination & sulpho chlorination can be performed in it.
- All Glass components and complete plant can be operated safely at temperature 200° C provided that there is no sudden temperature shock.
- This practical working temperature limit is set by the physical properties of the sideline equipments like gaskets, PTFE bellows, couplings and structure & supports, but not the glass components.
Quick changes in temperature across the walls of glass components should be avoided during operation both indoors and outside.They result in increased thermal stress in the glass, which as described above, has an adverse effect on the permissible operatpressure of the plant components. Although it is not possible to give a definite figure applicable to all the operating conditions likely to be encountered in practice, a maximum permissible thermal shock of 120 K can be taken as a general guide.
Permissible Operating Pressure
The permissible internal operating working pressure depends on the nominal diameter size of glass components and external temperature. The maximum working pressure for a complete glass plant is determined by the lowest rated components in the system. All glass components are suitable at full vacuum over the entire temperature range. Bar g is a measure of absolute pressure
Though any damaged glass equipment can be repaired, mostly it is not economical to do so. Generally the repair, which involves less than a third of its original work, is worth to carry out repairing. Repair work is costly because:
However, while sending equipment for repairing, following care must be taken:
- It generally requires greater skill than making a new one
- Since it involves high risk of total breakage, the risk of total loss of time spent on its repairing goes along with.
- The work involved in receiving a damaged equipment, identifying it throughout the handling, cleaning it, estimating its repairing charges,re-estimating the repairing charges in case damage extends etc are relatively expensive.
- Each job requires individual attention throughout the execution.
- Inform the nature of breakage and get an estimate of repairing charges in advance to avoid the loss of transportation expenses in case it is uneconomical to go for repairing.
- Since repairing takes longer time to fit into production schedules and completion of repairing is highly uncertain, it is generally suggested to arrange for a substitute equipment to continue the work.
- Equipment to be repaired should be clean. Since it can be cleaned better and at less cost at owner's premises. It should be cleaned before sending it for transportation. This also makes it safer to transport.
- Pack with extra care, since cracks in glass have a tendency to extend with every jerk.
- If Possible, send broken pieces along with it.
- Generally rpairing work is accepted only for the equipment manufactured by us, andis repaired at owner's risk only.
Length & Tolerance of Glass Components
Tolerance in length L together with dimension L1, L2 and L3 of all components are as under. Unless otherwise should be specified for given components in this catalogue. All dimensions are in mm in this catalogue, unless otherwise specified.
DIN ISO 3585, DIN ISO 3586, DIN ISO 3587, DIN ISO 4704, BSEN 1595,
Trouble Shooter for Glass Users
Key to successful growth oriented business relations between Glass Users & Suppliers. Adopt following Instructions and feel free of stations regarding Glass Plants/Units.
Leakage of Glass Plants / Units
During installation / erection of glass plants / units at your site, nprovide your one person for required training of tightening assembled glass components in case of any minor leakage in future. Keep replacing PTFE "O" Rings and Couplings as & when required. In case of heavy leakage please call us immediately.
End of suppliers Resssponsibility
On installation of glass plants/units & after successful water & vacuum testing the plant/unit, handed over to the buyer. The suppliers cut-off time starts & all responsibilities ends here.
The following technical staff is available on per day charge basis :
(1) Engineer (2) Skilled Fitter (3) Semi Skilled Fitter (4) Helper
Take Precautions While Placing Youe Order
Place your Order in written form only & ask for written confirmation.
Glass Components are custom made fabricated Items, to attain quality, reasonable specific time is required for making & anneal. Hence plan your requirements well in advance & place order accordingly.
Glass is fragile, breaking risk persists during transit & in-case of any damage, disputes /dissatisfaction starts because offered rates were ex-works. To avoid, pick-up any one facility details as under :-
Packing & Forwarding
Proper & safe packing is essential for safety & P&F Charges extra.
- Transit Insurance, (cost to be charged in Invoice) for transportation of glass components on behalf of buyer & freight on
To-pay basis. In case of damage, the buyer is liable to pay Invoiced amount as per terms & conditions to supplier and should get the claim from Insurance company.
- Personal delivery facility against lum-sum charges (called as delivery charges) inclusive of freight charges, risk charges & as well delivery boy expenses.