Piping and accessories
36Pages

LINED PIPES AND FITTINGS PTFE / PFA lined pipes and ideal solution for conveying or treating highly corrosive fluids using severe service PTFE / PFA lining is chemically inert facing the majority of corrosive MERSEN masters 3 lining manufacturing technologies : • Extrusion of PTFE fine powders • PTFE isomoulding Thus MERSEN offers a large product range with high performances. Our PTFE & PFA lined products show several advantages : • High resistance to thermal • PTFE / PFA linings are seamless • Possibility for custom made pieces (complex geometry) • Easy installation, no gasket • Low natural permeability rate MERSEN also manufactures PTFE bellows and PTFE lined

I ARMYLOR PRODUCT RANGE PRESENTATION 3 Mersen has an engineering team dedicated for customer assistance. Our experts help to study the best technical & economical solutions for your projects. This team can also help customers to establish take-off from isometric drawings.

Presentation of Armylor range Mersen is a global expert in materials and equipment used in extreme environment, and safety / reliability of electrical equipment. One of the 4 Mersen activity consists in process equipment designed and compliant for hot and corrosive applications. We design and manufacture in Europe, USA, China & India equipment such as heat exchangers, anti-corrosion systems, pressure vessels, agitators in a wide range of materials (Graphite, silicon carbide, reactive metals, fluoropolymers…) Since 1964, Mersen offers an exhaustive range of PTFE / PFA lined pipe and fittings...

Available lining materials for our product range are as follows Virgin or anti-static* PTFE (polytetrafluorethylene), in accordance with theASTM D4894 Virgin or anti-static* PFA (perfluoroalkoxy), according to ASTM D3307** standards. 'Conductive black PTFE or PFA ** Also on request according to DIN S34SS standard GENERAL CHARACTERISTICS Values indicated in the following table are given for virgin PTFE. These characteristics can vary depending on raw material received, the transformation processes and their components. * amorphous phase, ** crystal phase CONTROLLED CHARACTERISTICS AT RECEIPT...

NOMINAL THICKNESSES Mersen proposes 3 ranges ARMYLOR® G to operate under pressure ARMYLOR® V to operate under pressure and vaccum ARMYLOR® S for special applications. Ask us PTFE / PFA NOMINAL THICKNESS chart below The minimal thickness of the PTFE tube is equal to the nominal minus 10%. The thickness of the flare cannot be lower than 20% of the nominal thickness. On each manufacturing batch, Mersen checks mechanical & physical properties. Values for elongation at break and tensile strength, together with regularity of the graph confirms that the liner sintering has re-established the...

Optimal density ensures a balance between a low permeability level and a good distortion during temperature cycles. The results comply with the ASTM F1545 standard. • ANTI STATIC PTFE / PFA ELECTRICAL PROPERTIES Transverse resistivity : < 107 ohm based on the BS 2050 standard Surface resistivity : < 108 ohm based on the BS 2782-230A standard Volume resistivity : < 108 ohm.cm based on the BS 2782-231A standard

Thanks to mastered manufacturing technologies (PFA injection, extrusion of fine PTFE powders, Isomoulding) Mersen optimised PTFE lining thickness and manufacturing procedures to limit permeability rate. Several factors have an influence: Thickness of the lining is the most significant factor. The curve below shows the sharp decrease in permeability level according to thickness. Size of the ions or molecules. This Helium permeability curve shows the ability of a very small molecule such as helium to pass through the PTFE / PFA. Chemical nature of the product: any chemical similarity between...

STEEL SHELL The table below shows the various steel components used for manufacturing of our standard pieces. 3.1 mill certificates in accordance with EN 10204 are available on request. ASTM or JIS standards compliant steel grades, low temperature or stainless steel grades can be supplied on request. Please contact us for more information. CONTROL DURING MANUFACTURE The dimensional inspection is always completed by the following additional checks : Straightness and positioning of flanges. Absence of any protruding element inside the parts that might damage the lining. Mersen offers certain...

STEEL SHELL WELDING Mersen is qualified in accordance with the European standards EN 288.3 (for operational modes) and EN 287.1 (for welders) regarding the A.A.G., M.I.G. & T.I.G., A.D.M. HP 5.3 and ASME IX processes. These qualifications are regularly renewed, either internally by using an external independent organism . External audits are carried out in order to ensure that our suppliers meet the same requirements. Mersen is also HPO, SQLO, and ASME Stamp ‘U’ certified. FLARED STUB END Regarding spools, Mersen builds them with 2 loose flanges on collars obtained by cold forming of the...

LINES COMPONENTS DIMENSIONAL TOLERANCES The lined pieces and their dimensions are indicated in pages 17 to 35. All the lined pieces are built using following tolerances : TEMPERATURE CYCLE TESTS The pieces tested undergo 100 alternate steam/cold water cycles, according to theASTM F1545 standard. Steam is absorbed by the lining under the influence of both temperature and pressure. Lining vacuum resistance is then proved thanks to significant mechanical stresses due to the sudden pressure drop combined with fast cooling. VACUUM RESISTANCE Vacuum 2 Torr 230° C Vacuum 2 Torr 150° C Vacuum...

QUALITY CHARACTERISTICS CONTROLLED DURING MANUFACTURE Mersen manufacture the PTFE lined pipe and fittings in accordance with DESP 97/23 CE. In addition to the numerous internal checks carried out throughout the entire manufacturing process acceptance of powders, physical properties of the lining, etc.) all piping is subject to the following inspections ; • Dimensional and visual check : the overall dimensions of the spools, the size of the collars, the lining thickness of moulded pieces and the absence of surface defects are checked once the pieces have been produced. • Spark test : each...