This will help ensure you have the correct installation procedure for your specific application before installing any components. Flange bolt torque sequence and torque table a complete bolt tightening procedure. They can be threaded onto a new or existing bolt, stud, threaded rod or shaft. Pocket guide to tightening technique this booklet provides an introduction to the technique of using threaded fasteners for assembling components, the application of power tools for the assembly and the influence of tool selection on the quality of the joint. The first time around tighten to approximately 12 of the final torque, and then repeat the sequence, tightening to the suggested torque limit. Pdf the effect of bolt tightening methods and sequence.
T the purpose of tightening screws is to fix one object to another object. The torque values can only be achieved if nut or tapped hole has a proof load greater than or equal to the bolts minimum ultimate tensile strength. Flange bolt torque sequence and torque table a complete bolt. All diagrams can be found in numerical sequence at the back of this publication. This not only creates a better connection, it also reduces ongoing maintenance costs and increases safety. If the correct tightening sequence is not followed, the flanges can be misaligned, making it impossible to have uniform seating of the gasket. End users should identify and use the correct torque value and apply the torque in increasing steps using the appropriate tighten ing sequence and process detailed in asme pcc120. Bolt tightening sequence or torque sequence is key to achieve this. Mar 20, 2017 this feature is not available right now. Inspection for the bolt itself is possible even after tightening.
Bolt tightening solutions no matter what your preference for bolt tightening, atlas copco have it covered. South australian water corporation technical standard issued by. Always verify the part number for your application with the part number on the side of box and the part number on the instruction sheet. Description this section contains information on the correct usage and identification of bolts, flat washers, lock wash. The bolts shall be tightened by torque control, using the specified. Tighten large bolts 1 in the number sequence s hown to a torque of 150 15 n m 110 11 lb ft. The sequence in which bolts or studs are tightened has a substantial bearing. Following the manufacturers recommended torque sequence tighten the nuts and bolts in three equal steps to the specifications listed below with arp ultratorque fastener assembly lubricant. Aquatherm flange bolt torque and size for connection to flange fittings not aquatherm valves n. Aug16 pipe flange bolting guide geeforce hydraulics.
The effect of bolt tightening methods and sequence on the. Flange boltup torque tightening, preload, torque procedures. The torque tables are built on specific assumptions regarding bolt and nut factor. The stress in the screw when the screw has been tightened to the design extent is. Take cf100 as an example, the 4th nut to tighten according to my understanding would be the nut labeled as 7 in your graph. Effects of tightening a nut and bolt behaviour youtube. Continue tightening with a rotational pattern until no further nut rotation occurs at the 100% target torque level for any nut.
Tighten large bolts 1 again in the number sequence shown to a torque of 435 20 n m 320 15 lbft. It takes more force to tighten a 3410 bolt than to tighten a 31816 bolt because it is larger in diameter. In operation, the tightening process exerts an axial preload tension on the bolt. Resources to help you determine the right solution for your application. Specifications torque specifications torque specifications application ft.
Using torque tools, such as nutrunners or hydraulic torque wrenches, you turn. What is the purpose of bolt tightening sequence in flanged. Tighten the bolts approximately 30% to the final torque following the sequence shown in figure 2 shown on next page. With over 25 years of experience our bolt tightening products are used throughout the. Tm 5389538224 illustration 18 bolt tightening sequence for the cylinder head.
Numbering the bolts may be helpful in following the bolt sequence. The order can be the same as the tightening sequence or it can be. Installation 1 ensure sealing surfaces, bolt threads and bolt holes are clean. Here is an illustration of sequence in which the bolts around a flange should be tightened source if you are simp. The torque sequence column shows which diagram to use as the specific bolt torquing sequence for your engine. Valve rocker arm cover bolts in sequence 10y 89lbin water pump assembly bolt 10y. Loss of preload in pretensioned bolts tu delft repositories. Bolts should initially be tightened by hand, then a spanner wrench. Edelbrock 27011 intake manifold installation instructions. Guidelines for pressure boundary bolted flange joint assembly. Reassemble the unit in the opposite sequence of disassembling see bolt tightening sequence below. After flange assembly and all nuts have been run down by hand, start wrench tightening following the sequence of the numbers indicated marking the number on the flange with a crayon aids in keeping track of the tightening process.
Several factors affect how much tension occurs when a given amount of tightening torque is applied. When tightening, always use the correct sequential bolt order for the flange. First passinstall a new bolt after the installation pass and tighten as described in the first and final. The key to reducing these effects in the installation process is by slowly bringing the flanges together in a parallel line, taking a minimum of four bolt tightening passes, and by following the corrent bolt tightening sequence. The 5 step guide to torque tightening for leakfree flange. Why do the mechanics tighten the bolts in many steps. Torquetension relationship for astm a193 b7 bolts and studs. Cylinder head cover bolt tightening sequence courtesy of kia motors america, inc. Before beginning the tightening process, the following preliminary. Continue this sequence until all bolts are tightened. Then the bolt and nut are tightened to provide the minimum tension specified in table 25. Over tightening, misalignment, or uneven tightening can break brittle material flanges. Pn1016 flange bolt sets for wafer butterfly valves knowledge base recommended sequence for flange bolt tightening bolts. Scribd is the worlds largest social reading and publishing site.
Do not exceed 90 degrees total tightening in the previous two steps. The thicker the gasket, the higher the gasket creep which in turn can result in torque loss. After replacing all the bolts, follow the tightening procedure recommended in the bolting sequence diagrams. Then hand tighten till they are snug against the flanges. Flange bolt torque sequence and torque table a complete. In essence, a bolt axial tension is applied by the torque control method. If an air wrench is used make sure the pressure is set to the minimum. This tension load is of course equal and opposite to the compression force applied on the assembled components. Apply gm sealant 12345336 at end of seals on cylinder block. Plate heat exchanger maintenance manual customer name. Pdf the effect of bolt tightening methods and sequence on.
The american society of mechanical engineers or asme provides standards for how much torque fasteners should withstand and proper torquing during assembly. Tighten the cylinder head bolts to their final torque specification in 4 steps. When tightening the bolts in flanges we recommend the above sequence is followed to ensure that the flange faces are pulled together as evenly as possible. Tighten intake manifold bolts in sequence to specification. Start the tightening procedure by lubricating the nuts and bolts. Before using a given torque table, these assumptions should be verified to. In order to determine the bolt relaxation or bending behaviour during tightening, four nodes are the effect of bolt tightening methods and sequence on the performance of. Among those is a new appendix f alternatives to legacy tightening sequencepattern, which outlines several alternative bolt tightening patterns that may save joint assembly time and result. On assembly all bolts and nuts in the joint are first tightened to the snug tight condition. All fastenerscomponents listed in this table must be discarded and replaced with new after removal. In this video we explain bolt behaviour and elastic limits. Bolt tightening table table 14 table 15 figure 21 1. Bolt tightening sequence for flanges using 8 bolts lubricate bolt and nut threads and nut bearing face where it contacts the flange. Like tightening torque and tightening angle, this sequence is specified.
The inspection planning using riskbased methods standard pcc3 provides guidance on the preparation of a riskbased inspection plan. Lower oil pan bolt tightening sequence courtesy of kia motors america, inc. A proper bolt tightening sequence in flanged joints is essential to control stress variation in flange joint components. Flange bolt torque sequence and torque table a complete bolt tightening procedure flange joints require proper tightening to avoid the leak of the fluid from the joint. However, i dont quite understand the tightening sequence of cf100 and cf200. Correct tightening of a bolt means making the best use of the bolts elastic properties. Tightening torques for metric bolts of yield strength sy metrique diameter mm 6 8 10 12 14 16 18 20 22 24 27 30 33 36 39 42 45 48 52 56 60 64 68 m6 m8 m10 m12 m14 m16 m18 m20 m22 m24 m27 m30 m33 m36 m39 m42 m45 m48 m52 m56 m60 m64 m68. Guidelines for pressure boundary bolted flange joint assembly pcc1 provides guidance and is applicable to both new and inservice bolted flange joint assemblies.
With our products, bolting is fast, safe, easy and accurate. The onoffon tightening sequence can provide information as to the clamp force provided by the bolt, which allows a better indication of the structural integrity. Flange joints require proper tightening to avoid the leak of the fluid from the joint. The importance of tightening torque most engineers already know the importance of a high preload in maintaining joint integrity. Basically you just start with the centermost bolt and work. Bolt tightening sequence or torque sequence is defined in torque tightening procedure. Cirrus airplane maintenance manual model sr22 2060 page 1 all effectivity. Hydraulic bolt tensioners have a footprint and thread height requirement.
Additive loading and bolt re tightening are possible. The specified method of bolt tightening is equally applicable to galvanised and ungalvanised bolts. Jan 10, 2016 start the tightening procedure by lubricating the nuts and bolts. Move another 90 degrees around the flange for the 3rd bolt. Apply suitable axial tension it is best to do axial tension control for tightening screw, but actually it is difficult to measure. Hiforce hydraulic stud bolt tensioners offer the quickest, safest and most accurate means of applying a specific residual load to stud bolts. Bolt tensioning, torquing and tightening screw gas. Tighten all bolts in sequence an additional 8090 degrees. Tightening sequence for bolted flange joint assembly. If i can find a diagram on the sequence for tightening ill post it.
The importance of tightening torque the problem bolt. Bolt preload is the tensile force in the bolt after it has been. Tightening of bolts and nuts shall be in accordance with the manufacturers instructions and the following procedure2. Put 4c5593 thread lubricant, clean engine oil, or 6v4876 molykote paste lubricant on the threads of bolts 1.
Begin replacing the highstrength alloy bolts suggested for test conditions one by one with the standard bolts while maintaining stress on the gasket. Camshaft bearing cap bolt tightening sequence courtesy of. Torque all of the manifold bolts in two steps by the sequence shown in figure 1 to 25 ftlbs. Reusable threaded fastener tightening specifications single use nonthreaded fastenerscomponents application note. The first pass, lightly tighten the first bolt then move directly across or 180 degrees for the second bolt, then move14 turn around the circle or 90 degrees for the third bolt and directly across for the fourth. Bolt torque for polyethylene flanged joints tn38july 2011 lapjoint style flange assembly. Stud bolts bolting torque tables table 1 astm a193 and astm.
Scribble it on a virtual napkin, fold it up and drop it right here. Using wermacs tightening sequence drawing, follow the below steps. Always use a torque wrench or other controlledtensioning device for tightening. There are several ways of securing parts and components to. Lightly tighten 1st boltthis is one of the most important factors of the process. Table 4 reliability of tightening processes of preloaded bolt assemblies. Tighten bolts 1 through bolts 22 in a numerical sequence in illustration 18. Loading method by tightening the nut while tensile load is applied to the bolt, tightening. Bolt tensioning, torquing and tightening free download as powerpoint presentation. In the quest to eliminate leaks in piping and pressure vessel systems, it is necessary to first develop an understanding of the mechanisms that cause leaks, the behavior of the joints where leaks occur, and most importantly, the proper use of the devices that are. Pipe flange bolting guide aztec bolting services, inc. To work well, a bolt must behave just like a spring. When tightening a four bolt flange, use a crisscross. Torque is the force used to tighten fasteners or the amount of rotational force that a fastener must be able to withstand before failure.
Put engine oil on the threads of the bolts and the nuts. With over 25 years of experience our bolt tightening products are. Commence tightening of the bolts sequentially starting with a first pass at 25% of the final specified and required torque figure, a second. My client has requested a bolt tightening sequence to be included in the installation guidelines document for an offshore flexible riser 2piece hangoff clamp which has a horizontal circular pcd bolt group and a vertical rectangular bolt group. Do not fully tighten the bolts the first time around as this can tilt the flange out of parallel. Repeat steps in procedure 9 increasing the torque to approximately 50% to 60 % of the final appropriate torque value. Use a crisscross sequence starting with the bolts at the middle of the head and working toward the outer bolts as follows. Clamp load calculated as 75% of the yield strength for the b7 specified in astm a193. Illustration 18 bolt tightening sequence for the cylinder head. A new approach to the tightness checking of bolts bill eccles, bolt science.
Technical note 62 assembly and tensioning of high strength. Shown is the bolt tightening sequences for typical circular flanges. Correct procedure for flange bolting installation procedure. Cylinder head bolts m8 inner bolts in sequence 30 nm 22 lb ft. This is due to its simplicity and its widespread understanding by all engineers. Dec 24, 2015 not only do they tighten it in multiple steps, if you observe carefully, they follow a specific sequence of tightening the bolts. Continue torquing all studs in the sequence of figure 1, using the specified appropriate. Assembly and tensioning of high strength bolts and nuts transport and main roads, january 2012 1 1 clarification of bolt tensioning the purpose of this technical note is to define the acceptable requirements for the assembly and tensioning of high strength bolts for department of transport and main roads tmr projects.
565 1264 1146 963 201 919 477 970 1142 748 388 471 992 120 906 1058 501 1287 173 824 322 1268 890 906 1273 948 531 609 200 1133 10 836 1170 442