Monday, March 29, 2021
Flange torque sequence chart

Flange torque sequence chart

Flange joints require proper tightening to avoid the leak of the fluid from the joint. Bolt tightening sequence or torque sequence is defined in torque tightening procedure. Flange joints are torque tight with the help of a torque wrench Manual or hydronic wrench. To achieve the benefits of the pre-loading, the clamping force in the screw must be higher than the joint separation load.

Flange Bolt Chart

When the bolt loading requires a torque higher than Nm ft-lbs. The torque value is dependent on the friction between the threads of stud bolt and nut head, this friction can be affected by the application of a lubricant or any plating e. Cadmium or Zinc applied to the stud threads. If a bolt is torqued rather than the nut then the torque value should be increased to compensate for the additional friction — bolt should only be torqued if they are fitted in clearance holes.

The bolts shall be tightened by torque control, using the Anti-seize lubricant shall be used such as Molykote or equivalent, before installation. The specified method of bolt tightening is equally applicable to coated, galvanized and ungalvanized bolts. While aligning flanges, make sure that there are no residual stresses in the joint.

The use of heat correction for the alignment of flanges is strictly prohibited.

Horsepower vs Torque - A Simple Explanation

For easy handling, bolt numbering shall be done clockwise around the flange with the following sequence. Pre-checks for Bolt Tightening Flange Condition Check conditions of flange faces for scratches, dirt and scale. Check for corrosion pitting and tool marks. Inspect the gasket seating surfaces. Check the areas on the flange where the nuts will seat, it should be flat and free from pitting and excessive wear.

Flange faces should be parallel and aligned. The flange bolt holes should be in line so that the bolts will pass freely. Nut-bolts with damaged threads should not be used.

Flange bolts shall be furnished in sufficient length to allow the use of bolt tensioning equipment or spades, spacers, drip rings and wafer valves, and the associated extra gaskets. Visually examine studs and nuts after cleaning to ensure free from burrs.

Studs and nuts shall be cleaned using a wire brush to remove any dirt on the threads. Lubricant shall not be used in the gasket and the gasket seating area. The bolt and nut material grades should be correctly identified before they are used.

Bolts and nuts can only be reused if it is known that they have not been overloaded or exceeded their yield point. When assembling the nut on the bolt, the nut identification marking must always point outwards. Gasket Checking Do not use sealing compound, grease or other paste or adhesive on gasket or flange faces.

flange torque sequence chart

While gasket insertion, it shall not be forced into the gasket seat between the mating flange faces. Once the gasket is seated the mating flanges are brought together carefully without shaking the gasket off the seat, install all studs and run-up all nuts hand tight. Visually examine gaskets, before installation, to assure they are free from defects. Color coding shall be maintained as per the rate and type of gasket provided by the manufacture.

flange torque sequence chart

Clean gasket seating face using a wire brush. Make sure the material is as specified, look for any possible defects or damage in the gasket such as folds or creases. All Soft material gaskets should be replaced with new ones whenever an opened joint is to be closed again. The spiral wound gasket shall be used only once. Check that gasket is getting compressed uniformly.Flange joints require proper tightening to avoid the leak of the fluid from the joint. Bolt tightening sequence or torque sequence is defined in torque tightening procedure.

Most company has their Flange bolt torque tightening procedure that used during construction and operation of the plant. Flange joints are torque tight with the help of a torque wrench Manual or hydronic wrench. To achieve the benefits of the pre-loading, the clamping force in the screw must be higher than the joint separation load. When the bolt loading requires a torque higher than Nm ft-lbs. The torque value is dependent on the friction between the threads of stud bolt and nut head, this friction can be affected by the application of a lubricant or any plating e.

Cadmium or Zinc applied to the stud threads. If a bolt is torqued rather than the nut then the torque value should be increased to compensate for the additional friction — bolt should only be torqued if they are fitted in clearance holes. The bolts shall be tightened by torque control, using the Anti-seize lubricant shall be used such as Molykote or equivalent, before installation. The specified method of bolt tightening is equally applicable to coated, galvanized and ungalvanized bolts.

Visually examine the flange alignment to ensure that an acceptable fit has been obtained. While aligning flanges, make sure that there are no residual stresses in the joint.

The use of heat correction for the alignment of flanges is strictly prohibited. For easy handling, bolt numbering shall be done clockwise around the flange with the following sequence. Skip to main content. Maximum Radial Projection of Imperfections that are. Size in Inch. Size in mm. No Deeper Than the Bottom of the Serrations, mm. Deeper Than the Bottom of the Serrations, mm. Thread Type. Torque lbf. Torque Nm.The grooved face of the flange provides a liquid tight seal on the gasket when flanges are properly assembled, supported, and proper torque is applied to the bolts.

Variations in gasket material and shore hardness may affect sealing torque required. Always use two 2 wide flat washers per bolt one under the head and one under the nut. Threads should be clean and well lubricated. Actual Bolt lengths required and torque values necessary to seal will vary based on type of equipment being joined. NOTE: certain applications may require flange bolts to be re-torqued at least 24 hours after gasket installation depending on flange materials being joined i.

Work with gasket manufacturer for proper material selection and other gasket design recommendations prior to installation. When evaluating gasket material, be certain to include any surge pressure that could be caused by opening valves and starting pumps.

All rights reserved. Memphis Web Design by Speak. Flange Installation Data. Do not use bolts to align the system or to pull flanges together. With the gasket in place, align all bolt holes of mating flanges by rotating the flange ring into position. Insert all bolts, flat washers two standard flat washers per boltand nuts. Be certain the faces of the mating surfaces are flush against the gasket prior to bolting down the flanges.

Using the illustrated bolt-tightening sequence shown below, tighten all the nuts by hand until snug. Apply uniform pressure across the flange by tightening in stages of 5 ft-lb increments until final torque values shown in the following table are obtained. Do not overtighten. Care must be taken to avoid bending stresses to the flange when mating to raised faced flange, metallic flange, stationary flanged objects or wafer-style valves. The plastic flange, attached pipe, fitting, and or valve must be supported properly to eliminate stress on the plastic flange.

Contact Us Morgan Street, P. BoxBrownsville, TN Are you trying to figure out how many bolts you need to flange up the project you are working on?

Regardless if its B7 studsB8 studs, or teflon coated studs. As fastener manufacturer, we got you covered. Need to know how many stud bolts and nuts are in a flange? Or how about an entire job? This is for informational purposes only. They, the user should look at the pipe size that they are needing. Once that is determined, the appropriate number of stud bolt will be found in the same line of the table.

Feel free to reach out to us for all of your b7 bolts, b8 studs, and any other type of fasteners used when consulting an ASME B Since then, our focus on the production of high quality parts at competitive pricing has allowed us to become an industry leader. Our niche in exotic high nickel alloy fasteners include materials such as: hastelloy, Inconel, monel, A, L, Alloy, duplex stainless as well as many additional alloys.

Being centrally headquartered in Baton Rouge, Louisiana, we are capable of shipping to jobsites all over the world. Many of our industrial projects that we supply material to include anchor bolts, and also stud bolts of many different ASTM grades. Innovation is a way of life for our company… This is why we have recently been awarded several national awards for innovation and excellence.

Please prove you are human by selecting the Cup. Email Us View Catalog. ASME B Contact us Our Team will contact you in less than 24 hours.Don't want to download the app?

Scroll down for full size charts. All values other than suggested torque amount are sourced directly from flange bolt charts and flange torque charts in the ASME B Looking up flange bolt sizes and torque patterns with Flange Bolt is far faster and less error prone than searching through PDF charts and tables.

The sole purpose of the tool is to make it as simple as possible for a pipefitters, steamfitters, and others working in piping to look up flange bolt size and torque pattern information.

Is there a feature you'd like from Flange Bolt that you don't see? Request it through the app and we'll do our best to add it to the development schedule. Full offline capability: No internet connection necessary to use.

All data is stored locally on your phone. The app requires minimum storage space overall. Instant flange bolt sizes and torque patterns: Just enter the flange size, class, and type and the app instantly populates the correct values from the flange bolt size chart and the flange torque sequence chart, along with wrench size.

Flange torque sequence image: Each lookup shows the correct flange torque sequence image in picture form, with the studs numbered. Customary units with diameter of bolts and flange bolt holes expressed in inch units. Customary units. Flange Bolt Chart Lookup flange bolt lengths, wrench sizes, and torque sequences right on your phone.

In seconds. About the App Look up flange bolt sizes and torque patterns in three taps with Flange Bolt. Just enter the flange size, type, and class, and the tool instantly shows the ASME values for: 1. Number of studs 2. Diameter of studs 3. Length of studs 4. Torque pattern 5. Suggested torque amount All values other than suggested torque amount are sourced directly from flange bolt charts and flange torque charts in the ASME B Features of the app: 1. The app requires minimum storage space overall 2.

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flange torque sequence chart

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Flange Bolt Torque Sequence and Torque Table – A Complete Bolt Tightening Procedure

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Water Suction and Transfer Hose Assemblies. Abrasive Material Handling, Con Transvac Fish Couplings. Black Iron, Galvanized Iron, StBolt lubrication greatly affects the torque values used when installing gaskets. To achieve the same gasket compression, a much higher torque value is required for a dry bolt versus using a lubricant.

In a dry bolt up, or where an inefficient lubricant is used such as light oil, the effort used in tightening is overcome by the frictional forces between the bolts and nuts and to a greater extent between the nuts and nut facings. This can result in a lower gasket load and inadequate stress on the bolts, which can result in torque loss and eventual leakage in service.

B7 studs with 2H heavy hex nuts and hardened steel washers are used and studs, nuts, and nut facings are lubricated with a never-seize paste using the installation and bolt tightening practices outlined above.

This makes flat face flanges very difficult to seal unless using a gasket with low compression characteristics such a a rubber gasket. The user should be aware that there most likely is insufficient bolt area to adequately seal flat face flanges. Torque Values are in ft.

Bolt Tightening Procedure

Lubricant should not be applied to the gasket or flange faces as a release agent. Hardened steel washers are also recommended to reduce friction. Torque Values.


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