Technical SpecificationsThese specifications define the material, technical data, fitting instructions and quality checks forour PTFE/PFA or PP lined pipes and fittings. They are in accordance with the following standards: DIN2874 for general requirements and DIN 2848 for dimensions.Contents1. Materials1.1 Steel parts1.2 Lining1.3 External coating2. General technical data2.1 Pressure Equipment Directive(97/23/EC)2.2 Steel pipe dimensions2.3 Flange connections2.4 Weights2.5 Liner thickness2.6 Operating temperatures2.7 Operating pressures2.8 Vacuum resistance2.9 Vent holes2.10 Tolerances2.11 Protective covers4. Fitting instructions4.1 Protective covers4.2 Gaskets4.3 Torques4.4 Welding operations4.5 Vent holes4.6 Permeation and diffusion5. Chemical resistance5.1 PTFE5.2 PFA5.3 PP6. Product developement3. Quality management3.1 Welding3.2 Materials certificates3.3 Raw material checks3.4 Optical and dimensional checks3.5 Spark tests3.6 Hydrostatic tests3.7 Marking3.8 Certificates
1. Materials1.1 Steel parts1.1.1 All steel pipes meet :DIN 1626 - DIN 2458 bzw.DIN 1629 - DIN 2448DIN EN 102171.1.2 Flanges and stub ends comply with:DIN EN 1092-11.1.3 Fittings comply with:DIN 2609 - DIN 2606DIN 26051.2 Lining1.2.1 PTFEThe lining is made from virginal PTFE(Polytetrafluorethylene) without anyaddition of pigments - its coloor is white.The minimum physical data acc. toDIN 2874 as well as GKV-guidelines are:Tensile strength= 26 N/mm 2Elongation = 275%Specific gravity = 2,14 - 2,2 g/cm 31.2.2 PFAThe injected material is pure PFA(Perfluoralkoxy) without any pigments- the colour is white opaque. The physicaldata according to DIN 2874 are:Tensile strength= 21 N/mm 2Elongation = 300%Specific gravity = 2,12 - 2,16 g/cm 31.2.3 PPAll PP liner pipes (Polypropylene) aremade of material Type II acc. toDIN 8078; they are grey (RAL 7032).Physical Data:Tensile strength= 26 N/mm 2Elongation = 120%Specific gravity = 0,91 g/cm 31.2.4 Conductive liningUpon request the PTFE- and PFA-liningcan also be manufactured asconductive lining. The colour is deepblack.The resistivity acc. DIN/EC 60093and DIN/EC 60167 does not exceed10 8 Ohm at any place.1.2.5 FDA conformityUpon customers’ request the lining ofour piping parts complies to theregulations of the Food and Drugs Adminstration (FDA).1.3 External Coating1.3.1 SandblastingAll carbon steel parts are sandblastedacc. to SA 18.104.22.168.2 Paint coatingAccording to our standard specificationall carbon steel pipes are painted with anepoxy-zinc-chromate primer to protectthem from corrosion.
2. General technical data2.1 Pressure Equipment Directive (PED 97/23/EC)If the piping parts are applied within thepressure equipment directive (PED), they fulfillall requirements of construction, manufacturingand testing. Upon request we can issuea declaration of conformity for modules A,A1 and G for the categories I to IV. We are alsoauthorized to use the CE-marking.2.2 Steel pipe dimensionsThe outer pipe dimensions comply with DIN2448 and DIN 2458 respectively. This alsoapplies to the wall thickness as standard wallthickness.2.3 Flange connectionsFlange connections comply with DIN 1092-1.2.4 Weights of lined pipes and fittingsPlease refer to the corresponding data sheets.
2. General technical data2.5 Liner thicknessIn accordance with DIN 2874 the liningthickness must be 3 mm min. In practice, however,thicker linings offer better safety under vacuum,better resistance against abrasion as well as lowergas permeability. As far as PTFE lining is concerned,diverse operating conditions require differentliner thicknesses:DN Standard mm Heavy duty mm25 3 432 3 440 3 450 3 465 3 480 3 4100 3 5125 4,5 6150 5 6200 5 6250 5 7,5300 5 7,5The liner thickness of fittings correspondsto the liner thickness of lined pipes.However, piping parts might have a higher linerthickness to optimise the product. Other liningthickness can be manufactured upon customerdemand.2.6 Operating temperaturesMaximum operating temperatures are :PTFE 230 °CPFA 230 °CPP 100 °CThese temperatures only apply underoptimum conditions. Special conditions mayrequire a reduction in vacuum and pressure.2.7 Operating pressuresStandard piping parts can be delivered inthe pressure levels PN10, PN25 and PN40. Otheroperating pressures are available upon request.2.8 Vacuum resistanceThe vaccuum resistance of the lined piping partsis determined by the factors production, technologyand liner thickness. The optimisation of theliner thickness enables the following values forvacuum resistance:DN 25 to 80 = 0 PA up to 230 °CDN 100 to 150 = 0 PA up to 180 °CDN 200 to 250 = 0 PA up to 150°CDN 300 = 0 PA up to 120 °CBased on your operating environmentwe can define the optimal liner thickness foryour pipes and fittings.2.9 VentholesVent holes should be kept open at alltimes. They have a dual function. Firstly, anypermeating gas should be allowed to escape,secondly, they serve as leakage indicators toensure rapid repair.2.10 TolerancesTolerances of pipes and fittings are definedacc. DIN 2448. The liner thickness may vary approx.10%. This applies especially to the area of the flareswhere the liner thickness may be up to 20% thinnerdue to the flaring process.2.11 Protective coversFlares are protected with a water proofplywood cover or plastic cap. All bolts and nutsare galvanized and can easily be loosened.
3. Quality management3.1 WeldingOur welding processes are subject tothe following criteria:1. We are recognised manufacturer inaccordance with AD-Merkblatt HPO/TRD 201/DIN EN 729-2.2. Our processes conform to AD-MerkblattHP 2/1.3. Our operations are supervised by arecognised welding expert.4. We only employ welders with a HP 3certificate.3.2 Material certificatesAll pipes, flanges, elbows and weldedfittings have a works certificateaccording to EN 10204 - 22.214.171.124 Raw material checksLining materials are only procured withmaterial certificates WAZ 2.2 from manufacturerscertified acc. to ISO 9001.3.4 Optical and dimensional checksIn addition, our own laboratory continuallychecks and records the physical data ofsemifinished products from the productionline. The dimensions of all pipes and fittingsare checked visually.3.5 SparktestsAll non-conductive lined pipes andfittings undergo a 30.000 Volt spark test tomake sure the lining is not porous.3.6 Hydrostatic testsThe hydrostatic test is carried outwith the 1,43-fold of the nominal workingpressure.3.7 MarkingIn accordance with DIN 2874, everypipe and fitting can be marked on theflange's circumference as follows:Manufacturer's signProduction lotLining materialDate of productionCE marking (if applicable)Additional markings – e.g. materialno. – are available upon customer demand.3.8 Certificates
3. Quality management3.8 Certificates
4. Fitting Instructions4.1 Protective coversProtective covers must only be removedimmediately before fitting.4.2 GasketsFlared surfaces of identical materials(PTFE/PFA) do not require gaskets. Gasketsmay only be sensible for connectionsfrequently undone or for connections to othermaterials such as metal, glass, enamel, etc.Lined pipes and fittings may not be welded,as the high temperature will destroy theplastic.4.3 Torques (for PN10)Torques for other pressure rates availableupon request. When using smoothrunningand greased screws and nuts werecommend the torques in the table below.The torque spanner should be used overcross.4.4 Welding operationsLined pipes and fittings may not bewelded, as the high temperaturewill destroy the plastic.4.5 Vent holesVent holes should at all times be keptopen. Care should be taken not to clog them withpaint or insulating material.4.6 Permeation and diffusionThe term permeation defines the transportof medium through the lining. Permeationis caused by two physical incidents:firstly, the diffusion of the medium through thespaces between the molecules of the plastic;secondly, the solubility of the medium in thepolymer (absorption).Diffusion can be decreased by the choice ofsuitable types of PTFE, by increasing the linerthickness and by using higher levels of crytallinity.However, this increases the risk of crackscaused by strain. To ensure optimal productsafety all aspects have to taken into consideration.Absorption defines the diffusion of mediuminto the liner. Cyclical stress due to temperatureor pressure leads to elongation mechanismswhich cause aggregations of mediumand even blisters. Isolation of those pipingparts can avoid or reduce those effects considerably.Diameter n. Bolts TorqueDN PN 10 Nm25 4 x M 12 3432 4 x M 16 5540 4 x M 16 6850 4 x M 16 8665 4 x M 16 11580 8 x M 16 71100 8 x M 16 78125 8 x M 16 105150 8 x M 20 141200 8 x M 20 208250 12 x M 20 166300 12 x M 20 197350 16 x M 20 260400 26 x M 24 330500 20 x M 24 460Details for assembly and operatinginstructions can be found in our datasheet FB 03.4b Assembly and operatinginstructions Rev.002-15.02.08.
5. Chemical Resistance5.1 PTFE has a universal chemical resistanceagainst almost all chemicals and solvents withinits continuous operating temperature - with theexception of molten alkalis, elementary fluorineand certain halogenes5.2 PFA identical with PTFE (5.1)5.3 PP Please refer to the manufacturer's information.6. Product developmentThis documentation is based on the experiencewe have gained up to now, it is intended to providethe user with advice.All information is to the best of our knowledgeand belief correct and given withoutresponsibility.We assume no liability with respect to the executionand nature of our products as well as theirperformance.We reserve the right to make technical changesresulting from the further development of ourproducts without giving prior notice.Edition 2009