High pressure tube unions
106Pages

ONE VISION. ZERO EMISSIONS.

Do you have to handle high pressures, extreme temperatures, aggressive media or hot vapours with high process reliability? Here are DILO’s high pressure tube unions! Our high pressure tube unions remain hermetically sealed even under critical operating conditions. The secret lies in the high quality metal-to-metal sealing principle developed by DILO. The high pressure tube unions are sealed without any intermediate seal compound. The seal is obtained by direct contact of the tongue and groove sealing surface.

DILO SEAL PRINCIPLE DILO is a seal principle without intermediate seal in the form of groove and tongue with little depth of immersion. This principle guarantees permanent tightness at high static and dynamic alternating stresses which might result from vacuum and pressure in connection with high temperatures and vibrations inside the tubing systems. The additional braking surface prevents plastic deformations at the ring-shaped sealing areas. Sealing in accordance with the DILO principle is effected by direct contact of the sealing profiles of the groove and tongue parts. The different...

MATERIAL STANDARDS Material specification AISI material specification DILO material code letter Surface treatment and cleaning Before dispatching or storing the finished tube unions must be treated as follows: a) ferritic material P250GH / 13CrMo4-5 / X10CrMoVNb9-1 / X10CrWMoVNb9-2 b) austenitic material / stainless steel Dimensions of tube connections / Standards ▪ All dimensions are indicated in mm ▪ Precision steel tubes (M Series) according to DIN EN 10305 ▪ Steel tubes (J Series) according to DIN EN 10220

MARKING / IDENTIFICATION On the face of the clamping nut the following markings can be identified: series and pressure stage nominal diameter DILO stamp batch number material mark 1.4571 Blanking disks are not marked due to risk of damage.

WELDING PROCEDURES The following welding procedures can be used for processing DILO unions: Welding phase according to DIN EN ISO 9692-1 no. 1.5 with 30°  Autogenous / WIG welding procedure Adjustment of tube wall thickness If the internal diameters between tube and weld-on stub differ from each other the welding part can be supplied with an adjusted tube wall thickness for aligned laying of tubes. e. g. 21,3 x 2,0 tube connection dimension Type: J1A16N1 = d28 = 17,3

TECHNICAL DATA OF THREADS Code designation Metric thread Whitworth thread American conical thread ANSI/ASME B1.20.1 thread angle 60° Screw-in stub and screw-in holes according to DIN 3852 - part 1: with cylindric, metric thread according to DIN 13 metal sealing edge according to DIN EN ISO 1179: with cylindric Whitworth thread according to DIN EN ISO 228-1 metal sealing edge screw-in stub form B screw-in hole form X screw-in stub screw-in hole NPT: Plug and screw-in hole with conical NPT thread according to ANSI / ASME B 1.20.1-1983

MOUNTING INSTRUCTIONS General DILO tube unions require no preliminary assembly or any special tools. Determine tube lengths exactly, cut off square, remove burrs and chamfer tube edges as per DIN EN ISO 9692-1. The only point requiring attention is to ensure that welded-in unions are in proper alignment. ▪ First tack-weld the DILO tube unions in the assembled form to the tubes (slightly tighten the clamping nut). ▪ Pay attention that when welding the negative pole is at that tube just being welded to the DILO tube union. In case of nonobservance of these two points there is the danger of a...

MOUNTING INSTRUCTIONS Mounting illustration: 2. Deburring of the bores Chamfer the tube edges according to DIN EN ISO 9692-1. 3. Tack-welding when bolted together. Clamping nut slightly tightened. Pay attention to the negative pole. 4. Unscrew the clamping nut and weld the tube connections. Pay attention to the negative pole. 5. Right: aligned welded tube union 6. Wrong: not properly aligned welded tube union results in leakage

7. Before assembling clean the DILO tongue and groove. 8. Lubricate - especially the austenitic steel - with suitable lubricants (e. g. type Never Seez from -180° C to +1,400° C / order no. 05-1172-R001) 9. Observe the lubricating points of lubricant at a DILO tube union. 10. Observe the lubricating points of lubricant at a DILO tube union. 11. Use soft metal seals according to DIN 7603 for sealing the screw-in stub opposite the housing or block.

FITTINGS FOR PRESSURE RANGES up to PN 640 and PN 1000 bar On request, the following fittings can be supplied Weld-on tube unions Angle weld-on unions Gauge connection unions Screw-in tube unions with metric or Whitworth thread Blanking disks

TORQUE TABLE Torque table for DILO tube unions Special version Series Nominal diameter Operating overpressure Tightening torque in table is indicated in Nm. Note: The determined data are recommended values and may slightly differ. During assembly, an aligned und unstressed tube connection as well as treatment of threads and bearing faces with lubricant is indispensable. Torque table for DILO screw-in thread Special version Nominal diameter Special version Tightening torque in table is indicated in Nm. Note: The determined data are recommended values and may slightly differ. These values are...

PRESSURE STAGE TABLE Temperature-dependent pressure stage table of the DILO high pressure tube unions Materials Material number acc. to DIN Material specification AISI material specification DILO material code letter series type DILO material code letter Nominal pressure up to temperature (°C) Admissible operating pressure in bar at operating temperature (°C) 20

QUALITY ASSURANCE Quality assurance takes highest priority within the DILO organization. Our approved and authorized experts permanently check the material carefully. The entire raw material is ordered according to DILO approval / order regulations. Thus, it is guaranteed that all necessary tests have been executed which is confirmed in test certificates according to EN 10204 (3.1). By marking the raw material and end products, the identity and traceability of materials is guaranteed. Our fittings are TÜV-approved. Furthermore, our company is certified according to ISO 9001:2015. Approvals and...