1 pipe Support Systems gmbh . International Dynamically Stressed pipe Supports wir unterst tzen Sie we Support you Abs1:1 13:42. PSS pipe Support Systems gmbh International pipe Support Systems gmbh . International .. we are a leading manufacturing company Our manufacturing operations are specialising in the eld of pipe Support carried out with the newest production products and Systems . machinery and test equipment and our PSS has over 35 years experience personnel employs the proven technology in design, engineering and manufacturing required to make us your reliable partner of pipe hangers for power plants, who will truly meet your needs. chemical and petrochemical projects. PSS has a powerful and experienced team Our design, manufacturing, R&D and of engineers, technicians, service and marketing departments are located sales personnel at our Neunkirchen facility in modern facilities in the city as well as through our representatives and of Neunkirchen.
2 Partner companies worldwide. Abs1:2 13:42. PSS pipe Support Systems gmbh International ENGINEERING .. OUR QUALITY STANDARDS. Design and Calculation of all Types DIN EN ISO 9001. of pipe Supports KTA 1401. Detail Engineering SIEMENS QSP 4A. PDMS Engineering Design of Special pipe Supports Stress Analysis and Finite Element Analysis PSS STANDARD SUPPORTS. are designed in accordance with: .. OUR PRODUCT RANGE DIN EN, VGB and SVDB Speci cations Hydraulic Shock and Sway Suppressors BS3974, Part 1. (snubbers) KTA Constant Hangers and Supports ANSI B Variable Spring Hangers and Supports MSS SP 58 and MSS SP 69. pipe Clamps Sway Struts ASME Section III, Subsection NF. Special pipe Supports Accessories for pipe Hangers PSS INERNATIONAL PRODUCTS. are worldwide present in more than 60 countries .. OUR MAJOR MARKETS in Europe, Asia, North- and South America, Africa and Oceania. Nuclear and Conventional Power Plants Re neries Platforms Oil, Gas and Chemical Process Plants and Related Industries wir unterst tzen Sie we Support you Abs1:3 13:42.
3 PSS pipe Support Systems gmbh International Content Summary Dynamically Stressed pipe Supports 5. 1. Hydraulic Shock Suppressors and Vibration Dampers 6. General Information on Hydraulic Shock Suppressors and Vibration Dampers (Snubbers). Application, Function 6. Construction and quality characteristics 7. Design Variations 8. Standard settings and test values, Maintenance of hydraulic shock suppressors and vibration dampers 9. Test Diagram for Hydraulic Snubbers 10. Technical data Allowable loads 11. Figures without extension: Figures 200A, 200B, 202A. Figures with extension: Figures 201A, 201B, 203A 12. Figures 200A, 201A 13. Figures 200B, 201B 14. Figures 202A, 203A 15. Calculation cold position, hot position 16. 2. Extensions 17. Extension pieces for Hydraulic Shock and Sway Suppressors 17. Technical data Extension pieces, Fig. 201S, 201C and 201W 18. 3. Sway struts 19. General Information on Sway struts Application, Construction and quality characteristics, Design Variations 19.
4 Technical data Figure 211L Typ E1 20. Figure 211L Typ E2 21. 4. Weld-on brackets 22. General Information on Weld-on brackets 22. Technical data Figure EHS 14S 23. 5. Dynamic load clamps 24. General Information on Dynamic load clamps 24. Technical data Dynamic three bolt clamp, Fig. 211R 25. Dynamic yoke clamp, EHS17D 28. Dynamic U-Bolt clamp, EHS18S 32. Dynamic Vertical clamp, Fig. 403D 34. 4. Abs1:4 13:42. PSS pipe Support Systems gmbh International Dynamically Stressed pipe Supports Dynamically stressed pipe supports from PSS are This group consists of the following products: used to Support , restrain and suppress dynamic Hydraulic shock suppressors load events. and vibration dampers Sway struts Weld-on brackets Dynamic pipe clamps 5. Abs1:5 13:42. PSS pipe Support Systems gmbh International Hydraulic Shock Suppressors and Vibration Dampers 1. Hydraulic Shock Suppressors and Vibration Dampers Application Function Hydraulic shock suppressors and vibration dampers In the event of a dynamic load that causes the are components of great relevance to the technical piston to move faster than the locking velocity set safety of pipelines and system components, and by PSS (standard velocity 2 mm/s), the check valve are employed for the purpose of their protection.
5 Closes, the free ow of the silicon oil is impeded, and the shock suppressor absorbs forces. When PSS hydraulic shock suppressors and vibration the pre-set force level is not attained, for instance dampers are employed to prevent damage to when the direction of movement is reversed, apparatuses, pipelines, pressure vessels, valves the check valve opens up again. In the event and pumps, which can occur through suddenly of a vibrating movement, both check valves open acting forces. This includes dynamic load events and close alternately, the shock suppressor which can occur during operation, such as water absorbs the same load in both tension and hammer, pipe bursts or pressure surges caused compression directions. The bypass (or over ow). by blowing off safety valves, as well as cases valve allows the piston to yield as far as the resulting from external events and conditions, de ned nominal load. such as earthquakes, explosions and wind load.
6 Moreover, PSS hydraulic shock suppressors and vibration dampers can be employed in vibrating pipelines and system components where vibration damping is required. Conditions: Amplitude is greater than mm Frequency is in the range 1-33Hz By employing hydraulic shock suppressors and vibration dampers, it is possible to reduce dynamic displacement amplitudes to a minimum. Movements due to temperature change are not hindered by hydraulic shock suppressors and vibration dampers. 6. Abs1:6 13:42. PSS pipe Support Systems gmbh International Hydraulic Shock Suppressors and Vibration Dampers Construction and quality at high frequencies in tension and compression directions. When the direction of movement characteristics changes, the second valve can already react before The PSS hydraulic shock suppressors and vibration the rst valve has returned to its initial position. dampers have pressurized hydraulic Systems thus allowing their installation in any position and By employing modern, high-quality sealing and orientation.
7 The uid level of the suppressors guide components, a service life of 40 years can can be easily and accurately veri ed though the be expected from a PSS shock suppressors when position of the piston rods as they relate to each used in nuclear applications. Relevant simulation other. testing with shock suppressors, Fig. 200A, have PSS hydraulic shock suppressors and vibration been conducted in association with the T V. dampers are of a modular construction. institute. Depending on the conditions in which Modi cations and alterations, which may be hydraulic shock suppressors and vibration dampers required due to tight installation spaces or in are employed, a maintenance-free period of order to replace shock suppressors from other between ten and 25 years can be assured. manufacturers, can be implemented quickly by modifying the standard components. Use conditions for PSS hydraulic shock absorbers and vibration dampers With hydraulic uid With hydraulic uid Unit nuclear standard Constant operating temperature [ C] 20 to 80 50 to 80.
8 Short-term temperature* [ C] 150 150. Radiation dose, max. [Megarad] 100 20. Ambient pressure, constant op. [bar] 1 1. Ambient pressure, short-term [bar] 10 10. Solidi cation point [ C] 40 67. Flashpoint [ C] > 550 600. Ignition point [ C] > 600 > 675. * max. 40h per year with max. cycle times of 1 hour A PSS hydraulic shock suppressor and vibration The following documents were taken into consid- damper consists of two valve pairs, working eration in the dimensioning of PSS hydraulic shock independently and which are externally accessible. suppressors and vibration dampers: This allows the dampers to be optimised in VGB Guidelines (Richtlinien). accordance with customer requirements on the KTA test bench ( locking velocity, bleed rate). DIN 1050, DIN 4100. Even following installation, it is still possible to BS 3974, Part 1. modify the settings should this be required by the ANSI conditions at the installation site.
9 By employing MSS SP 58. independently functioning closing valves, PSS MSS SP 69. hydraulic shock suppressors and vibration dampers SVDB Guidelines (Richtlinien). are able to generate the force required for use ASME Section III Subsection NF. 7. Abs1:7 13:42. PSS pipe Support Systems gmbh International Hydraulic Shock Suppressors and Vibration Dampers Design Variations The cylinder body is made of carbon steels, protected by a zinc-iron plating plus a painting PSS hydraulic shock suppressors and vibration system according corrosive category C5-M. dampers are manufactured and available in the (PSS-painting system PSS-6). following options: Other material combinations and special Standard design coatings are available if requested by the Housing components made of carbon steel with customer. an extremely corrosion-resistant zinc-iron coating, 15 m. Furthermore, PSS offers special accessories, such The piston rods are additionally coated with as bellows for protection against the build up of 40 m electroless nickel on all sides and the shaft hard ice deposits on the piston rods or to protect with 20 m hard chrome.
10 The piston rods when employed in sandstorms or in installation areas with a high level of dirt. Low-temperature design down to -50 C To prevent the installation length supplied by the Housing components are made of stainless customer from being altered during installation, steel and additionally coated with 15 m PSS also offers a piston rod lock as an optional electroplated nickel. accessory. This can be combined with the piston Piston rods made of materials suitable for use position indicator (see images). at low temperatures are additionally coated with 40 m electroless nickel on all sides and the shaft with 20 m hard chrome. Stainless steel design All housing components, piston rods and joint heads are made of chloride-resistant steels, or , with coating if required. Offshore design Piston rods and reservoir made of chloride resistant stainless steels, or , Hydraulic snubber with piston rod locking device and piston position indicator rod eyes supplied in material Stainless steel hydraulic snubber Hydraulic snubber with piston bellows Hydraulic snubber with piston rod locking device, piston position indicator and piston bellows 8.