British Standard 4994 Youtube
British Standard 4994 Download Music. 5/28/2017 0 Comments. 5 – Ibadan area becomes a British Protectorate after a treaty signed by Fijabi.
Specification for Design and construction of vessels and tanks in reinforced plastics Executive summary Requirements for the design, construction, inspection, testing and erection of vessels and tanks in reinforced plastics. Superstamps Google here. Abstract This British Standard specifies requirements for the design, materials, construction, inspection, testing and erection of vessels and tanks in reinforced plastics, consisting of a polyester, epoxy or furane resin system reinforced with glass fibres, manufactured by the wet lay-up process. Constructions both with and without a lining of thermoplastics are included. Laminar constructions are usually anisotropic and the design method in this standard, being based on unit loadings, is particularly suited to the design of composites of reinforced plastics. This standard covers vessels and tanks subject to temperatures between -30 degrees C and 110 degrees C. This revision of this British Standard has been made to take account of experience with reinforced plastics vessels and tanks and opportunity has been taken to extend the scope to include filament winding and rectangular tanks and to categorize vessels in relation to duty.
History and related standards This British Standard is a revision of BS 4994:1973, which is withdrawn together with its explanatory supplement PD 6480.
BS4994 (formally: 4994:1987) is the 'specification for the design and construction of vessels and in '. It specifies a code of practice for use by manufacturers of such containers. With the publication of BS EN 13121-3, BS 4994:1987 Specification for design and construction of vessels and tanks in reinforced plastics is declared obsolescent, which will still cover those tanks still in service as tanks made from GRP are generally accepted to have a long working life. Dual laminate construction, simple FRP with glass mats, or a combination of unidirectional filament winding are common. DUAL LAMINATE: A lining material, preferably 3mm to 5mm thick sheet functions as a corrosion barrier. This thermoplastic liner is not considered to contribute mechanical strength. FRP which is constructed over this lining provides the strength requirements for materials to withstand design conditions like pressure, vacuum, hydrostatic load, etc.
The choice of thermoplastic is based on the chemical corrosion requirement of the equipment.,,,,, are used as common thermoplastic liners. FRP (GRP): Glass mats in the form of chopped strand mat and woven roving is most common in hand lay-up method. These mats are laid on the mold and impregnated with 'initiated' resins like polyester, epoxy, vinyl ester, bisphenol epoxy vinyl ester, etc. The choice of resin is based on the chemical corrosion requirement of the equipment. An earlier version of the specification was BS 4994:1973. NEW LOAD UNITS: It is to avoid the uncertainty associated with specifying the thickness alone, that BS4994 introduced the concept of 'unit properties'.
It is property per unit width, per unit mass of reinforcement. For example, UNIT STRENGTH is defined as load in Newtons per millimeter (of laminate width) for a layer consisting of 1 kg of glass per square meter, i.e., the unit is N/mm per kg/m2 glass. This standard still remains as most popular reference material for Further reading [ ] • BS 4994:1987 – Specification for design and construction of vessels and tanks in reinforced plastics. British Standards.