1、 STD*EEMUA PUB NO 200-ENGL 2000 I 57bb73Li 0003230 755 9 THE ENGINEERING EQUIPMENT AND MATERIALS USERS ASSOCIATION GUIDE TO THE SPECIFICATION, INSTALLATION AND MAINTENANCE OF SPRING SUPPORTS FOR PIPING PUBLICATION No 200 : 2000 STD-EEMUA PUB NO 200-ENGL 2000 57bb73Li 0003233 893 however such special
2、ists may not be readily available post- commissioning, during plant operation and maintenance. Accordingly, the EEMUA Piping Systems Technical Committee, comprising piping engineers from major multinational oil, chemical, power and contracting companies, has developed the present Guide. 1 STD=EEflUA
3、 PUB NO ZOO-ENGL 2000 57bb734 O003237 ZUT 1 INTRODUCTION The purpose of this publication is to provide guidance to users on the specification, installation and long-term safe use of spring supports for piping. The information contained in this Guide is a synthesis of the good practices employed by E
4、EMUA member companies, and is intended to complement specific information provided by manufacturers of spring supports. 3 Previous page is blank. STD*EEMUA PUB NO 200-ENGL 2000 576b73q 0003238 /Il6 2 SCOPE The requirements for piping supports are one of the outcomes of the flexibility analysis perfo
5、rmed as part of the piping system design. The scope of the present publication covers the specification of piping supports-in particular the information required by the manufacturer-the information to be recorded in the pipe support index, installation and commissioning procedures, in-service inspec
6、tion and maintenance, and, as a separate section, dynamic restraints. Advice is also given on safety aspects affecting plant modifications and demolition. 5 Previous page is blank. STDmEEMUA PUB NO 200-ENGL 2000 W 57bb73Li 0803239 082 m 3 DEFINITIONS The terms defined below are used throughout this
7、Guide. Also listed are other, commonly used equivalents or examples of the defined terms. Term Definition Bottomed out (see also Topped out) A condition where a support has reached the bottom of its travel and has effectively locked, and provides a much increased support effort. (The actual effect o
8、n the system will depend upon orientation, type of support and attachments.) System not in operation. Person deemed to have the appropriate knowledge, skills and experience to perform a particular task. Cold (see also Hot) Competent Person Equivalent/ Examples Off-line; off-stream Dynamic restraints
9、 Collective term for pipe supports that control Snubber shock and sway movement in a piping system. Sway brace Shock arrester Flexibility analysis Design analysis, often computer based, to Stress analysis determine support loads and characteristics, anchor and terminal point loadings, and movements
10、and stresses in a piping system. Additional items of a hanger type spring support assembly used for connecting the hanger to the pipe and to the supporting structure. Beam clamp System in operation at temperature and On-line; operating; on-stream; live Device to prevent movement of the spring Lockin
11、g pin support. Travel stop Hanger accessories Pipe clamp Hanger rod Turnbuckle Hot (see also Cold) pressure. Locking device Pipe support Generic term for describing a device used to carry the load of a piping system. It includes both a device for supporting piping from beneath in compression, and on
12、e suspended from a structure and carrying the piping load in tension. Rigid support; rigid hanger; rod; sliding foot; pad; anchor; stanchion Pressure test on the piping to verify the integrity of the materials and fabrication method. Hydrostatic test Hydro Pressure test 7 Previous page is blank. STD
13、-EEMUA PUB NO 200-ENGL 2000 57bb731r 000121rO BT1r W Spring support A pipe support that uses a spring to allow vertical and usually some angular and translational movement. spring can A condition where a support has reached the top of its travel md inay provide a much reduced or no support effort. V
14、ariable support; constant load support; Topped out (see also Bottomed out) 8 STD-EEMUA PUB NO 200-ENGL 2000 57bb73Li 00032LiL 730 4 SPECIFICATION OF REQUIREMENTS 4.1 General Considerations Spring supports and other pipe supports are specified by type, size and location during the detailed design of
15、piping systems to ensure that the piping is adequately supported and does not exceed the stress limits of the applicable design code during operation. Items such as guides, stops, struts, braces and dynamic restraints may also be specified in order to control or restrict piping movements. Spring sup
16、ports are also used to ensure reaction loads on equipment nozzles do not exceed design values. The methodology of a flexibility analysis carried out on a system to specifj the amount of travel and load on a pipe support is well documented and does not form part of this Guide. 4.2 Information for the
17、 Manufacturer Once the requirement for spring supports and the particular types are identified from the flexibility analysis, the piping designer in consultation with the user needs to provide the spring support manufacturer with additional information relating to the options available to him with r
18、espect to the design of the spring supports. Such additional information typically includes, but is not limited to, the following.- a) Materials of Construction The user is best placed to define the operating environment of the spring support so that appropriate materials are used to ensure an adequ
19、ate operating life of the support. Options include galvanised or stainless steel spring supports and coated springs. Provision for a Pressure Test Where the piping system is designed to have a pressure test in the field on completion of fabrication and installation, the manufacturer needs to be appr
20、ised of this so that he can supply additional stops on the spring supports to accommodate the hydrostatic test load. b) c) Unique IdentGcation The manufacturer will be allocated a unique tag number to identij each spring support in all documentation relating to the item. This is the key to reducing
21、the chance of a support being installed in the wrong location. The number should be consistent in all drawings, maintenance systems and procurement documentation. The number should also be included on an identification plate fitted to each support. The tag number is additional to the manufacturers o
22、wn serial number. 4.3 Index of Design Details During the design of a piping system with spring supports, it is advised that an index containing the design details is developed. The index should contain information such as : piping location load (hot and cold) spring support type travel 9 - STD-EEMUA
23、 PUB NO 2UO-ENGL 2000 57bb73q 0003242 b77 W identification number manufacturer direction The index can be used for installation and commissioning, and to update maintenance/ inspection systems. 10 STD-EEMUA PUB NO 200-ENGL 2OOLl 57bb73V 00032V3 503 II 5 INSTALLATION Prior to the installation of spri
24、ng supports, it is advised that all relevant parties agree a common procedure for the installation and ownership of the different elements involved. The procedure would include such items as listed below. 5.1 Area of Responsibility All parties involved in the installation work should have pre-define
25、d areas of responsibility which detail each persons role in the work. This will ensure that competent individuals carry out critical work in accordance with the procedure, and that elements of the installation work are not overlooked. 5.2 Verification of Location During the installation of a pipe su
26、pport, its exact location should be verified against the original design. As-built drawings of the system should be produced for record purposes. Where there is significant difference between the original design and the as-built system, the piping engineer should be informed of this. A further analy
27、sis of the system may be prudent. The entire system should be checked to verify that there are no impediments to free thermal movement. Checks should also be made on neighbouring steelwork, platforms, piping and supports for adequate clearance. Particular attention should be given to piping ancillar
28、ies such as drains and vents, orifice plate impulse lines and transmitter cabling. Experience has shown that such items may be installed too short or too rigid and may consequently be damaged by the thermal movement of the piping. 5.3 Verification of the Correct Spring Support The system should be c
29、hecked to verify that the correct support is installed in the correct location. This includes all types of support-spring supports, guides and stools. The use of a consistent identification system, as detailed in sub-section 4.2, throughout the design and installation aids this identification. 5.4 O
30、rientation of the Spring Support Time and effort should be spent during installation to ensure that the orientation of the spring support gives the best available view of the identification plate from grade or local walkways. The ability to view the identification plate and travel scale assists both
31、 further verification effort and inspection during the operating life of the spring support. 5.5 Specific Instructions from the Manufacturer Instructions relating to specific installation information of a spring support are obtained direct from the manufacturer. This information should be used to en
32、sure the correct installation of 11 STD.EEMUA PUB NO 200-ENGL 2000 57bb739 00032LiLi 44T the spring support, as design and setting methods differ with manufacturer and type of support. 5.6 Piping Elevation Adjustment The elevation of the installed piping system should be verified against the origina
33、l design as installation proceeds. Adjustment to the elevation can be made by use of the turnbuckle on the spring support rod or an adjusting nut on a base support. When adjusting for piping elevation, care should be exercised not to alter the pre-set load as this may introduce distortion, additiona
34、l stresses and changes to the distribution of support loads. The installed elevation should be recorded on the pipe support index. 5.7 Piping Lateral Movement Anticipated lateral movement should be taken into account to ensure vertical alignment of the support with its point of attachment to the str
35、ucture, in the hot condition. 5.8 Locking Devices All locking devices should remain in position throughout installation of a system. The timing of the removal of the locking devices should be defined in the commissioning procedure. 5.9 Temporary Supports The installer may be required to use temporar
36、y supports during installation and pressure testing of the system. On completion of installation, the temporary supports should be removed and verified as having been removed. 12 STD EEMUA PUB NO 200-ENGL 2000 57bb734 0003295 38b 6 6.1 6.2 6.3 6.4 COMMISSIONING The commissioning activity on a piping
37、 system should only be undertaken by competent persons working to a defined and agreed procedure which details roles and limits of responsibilities. The procedure would include key elements and activities as outlined below. Pressure Test If the original design specifies a field pressure test, the sp
38、ring supports will have been supplied with additional locking devices to facilitate the test. If the additional pins are not. supplied, the piping engineer should review the system and specify the temporary supports required-type and location-to allow the pressure test to be carried out. On successf
39、ul completion of the test it is important that the temporary supports and additional locking devices be removed, and their removal verified. Timing The commissioning of a piping system should only be undertaken after all installation work is completed. Before commissioning the spring supports, the p
40、iping system should have been fully pressure tested, all valves and actuators installed, and insulation and cladding fitted, as per the design. Also, the system should be full of process fluid or an alternative fluid with a similar specific gravity. For piping on liquid duties, this is necessary for
41、 correct balancing of the supports to take place. The working fluid at ambient temperature may be used for this purpose. However, consideration may be given to the early commissioning of spring supported liquid piping while the lines are empty provided an evaluation of the operating loads is carried
42、 out. Verification The commissioning team should verify that all spring supports are in their correct locations in accordance with the design. This is of particular importance if the installation and commissioning activities are completed by different groups, but may be omitted if completed by the s
43、ame group. Removal of Locking Devices Removal of the locking devices is important for the continued integrity of the piping system. If the system is designed properly and the pipe supports installed correctly, the removal of the locking devices on spring supports should be accomplished with only min
44、or adjustments to the supporting effort. With all temporary supports removed, a balancing procedure for spring supports should be followed. The aim is to maintain the correct elevation of the piping at each support location by making generally small, balancing adjustments to the support effort. The
45、support effort on variable spring supports is varied by turnbuckle adjustment; on constant supports by the load adjuster. 13 STD-EEMUA PUB NO 200-ENGL 2000 m 57bb73Ll 000329b 212 = Following a defined procedure, the support effort should be systematically adjusted at each support until a position is
46、 reached when the system is in balance and all locking devices can be removed. Each spring support indicator should line up against the cold set mark on the indicator scale. If the spring support indicator lines up outside the operating range (cold to hot marks on the indicator scale) the piping eng
47、ineer should be informed. Particular attention should be paid to any supports that have topped or bottomed out. The locking devices should be retained for future maintenance use. 6.5 Cold Verification Once all the locking devices have been removed, the system should be walked to ensure that all the
48、spring supports are free, there are no clashes with other piping or steelwork, and the indicators are approximately in line with the cold set mark. Minor adjustments may be required at this stage. All other types of pipe support, stops, guides etc. should be visually inspected to confirm set up as p
49、er original design. The actual cold positions, relevant stop gaps etc. should be recorded on the pipe support index. 6.6 Hot Verification When the system is running at its steady state operating temperature, it should be walked to verify that the spring supports have moved from the cold set point towards the hot operating point as marked on the indicator scale. The indicator may not line up with the hot operating mark if the system design temperature is significantly higher than the steady state operating temperature. The piping engineer should be informed if there
