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.
Bs 4994 Scribd
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 forFurther reading. BS 4994:1987 – Specification for design and construction of vessels and tanks in reinforced plastics. British Standards.
ESR Technology. Archived from on 2007-05-12. — a case study of the design process of a cylindrical vessel, using the BS 4994 methodology.See also.
Specifies requirements for design, materials, construction, inspection and testing of vessels (pressure and vacuum service) and tanks in reinforced plastics, consisting of a polyester or epoxide resin system reinforced with glass fibres, manufactured by the wet lay-up process. Includes constructions both with and without a lining of thermoplastics. Limited pressure and volume for vessels but no size limitation for tanks subjected only to hydrostatic head of liquid contents. Game onet pc portable. Appendices in clude examples of design calculations and methods of test. See also PD 6480.