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The Ultimate Critical Service Triple Offset Valve FLANGE BOLTING GUIDE A Divisi

The Ultimate Critical Service Triple Offset Valve FLANGE BOLTING GUIDE A Division of Bray International, Inc. The Ultimate Critical Service Triple Offset Valve F l a n g e B o l t i n g G u i d e Contents Page Examples of Typical Flange to Valve Bolting 3 Torque Loss 4 Gasket Installation 4 - 5 Tightening Methods 5 Class 150 | Double Flange Face To Face API 609, Iso 5752 Basic Series 13 | Body Drilling Ansi B16.5 6 Class 150 | Double Flange Face To Face API 609, Iso 5752 Basic Series 13 | Body Drilling Ansi B16.47 Series A 6 Class 150 | Double Flange Face To Face API 609, Iso 5752 Basic Series 13 | Body Drilling Ansi B16.5 Series B 6 Class 300 | Double Flange Face To Face API 609, Iso 5752 Basic Series 13 | Body Drilling Ansi B16.5 7 Class 300 | Double Flange Face To Face API 609, Iso 5752 Basic Series 13 | Body Drilling Ansi B16.47 Series A 7 Class 300 | Double Flange Face To Face API 609, Iso 5752 Basic Series 13 | Body Drilling Ansi B16.47 Series B 7 Class 600 | Double Flange Face To Face API 609, Iso 5752 Basic Series 14 | Body Drilling Ansi B16.5 8 Class 900 | Double Flange Face To Face ISO 5752 Basic Series 8 | Body Drilling Ansi B16.5 8 Class 150 | Gate Face To Face Face To Face API 609, Asme B16.10 | Body Drilling Ansi B16.5 9 Class 150 | Gate Face To Face Face To Face API 609, Asme B16.10 | Body Drilling Ansi B16.47 Series A 9 Class 300 | Gate Face To Face Face To Face API 609, Asme B16.10 | Body Drilling Ansi B16.5 9 Class 150 | Lug Face To Face API 609 | Body Drilling Ansi B16.5 10 Class 300 | Lug Face To Face API 609 | Body Drilling Ansi B16.5 10 Class 150 | Wafer Face To Face API 609 | Body Drilling Ansi B16.5 11 Class 300 | Wafer Face To Face API 609 | Body Drilling Ansi B16.5 11 2 Page A Division of Bray International, Inc. The Ultimate Critical Service Triple Offset Valve F l a n g e B o l t i n g G u i d e All information herein is proprietary and confidential and may not be copied or reproduced without the expressed written consent of BRAY INTERNATIONAL, Inc. The technical data herein is for general information only. Product suitability should be based solely upon customer’s detailed knowledge and experience with their application. A Division of Bray International, Inc. The Ultimate Critical Service Triple Offset Valve F l a n g e B o l t i n g G u i d e Examples of Typical Flange to Valve Bolting * Lug Threads may be tapped from both sides and therefore tap may not be continuous. Valve Body Double Flange/Gate Body L1 Stud Bolt Length L1 L1 L1 L1 Washer Washer Washer Washer Minimum Bolt Engagement Must Be Equal to Diameter of Bolt Valve Body Flange Flange Flange Flange Gasket Gasket Valve Body Lug Body L1 Stud Bolt Length Wafer Body L1 Stud Bolt Length Double Flange/Gate Body L1 Stud Bolt Length L1 L1 L1 L1 L1 Washer Washer Gasket Gasket Washer Washer Minimum Bolt Engagement Must Be Equal to Diameter of Bolt Gasket Gasket Gasket Gasket Washer Washer Flange Flange Valve Body Valve Body Valve Body Flange Flange Flange Flange Gasket Gasket Lug Body L1 Stud Bolt Length Wafer Body L1 Stud Bolt Length L1 Gasket Gasket Gasket Gasket Gasket Gasket Washer Washer Flange Flange Valve Body Valve Body L2 Stud Bolt Length L3 Hex Bolt Length L2 L3 Caution: To ensure proper installation refer to appropriate table within this guide for specific valve drilling information. 3 Page L2 or L3 specifies special stud lengths for hub and neck locations, that do not permit thru holes. A Division of Bray International, Inc. The Ultimate Critical Service Triple Offset Valve F l a n g e B o l t i n g G u i d e TORQUE LOSS Torque loss is inherent in any bolted joint. The combined effects of bolt relaxation, (approximately 10% during the first 24 hours after installation), gasket creep, vibration in the system, thermal expansion and elastic interaction during bolt tightening contribute to torque loss. When torque loss reaches an extreme, the internal pressure exceeds the compressive force holding the gasket in place and a leak or blow-out occurs. A key to reducing these effects is proper gasket installation. By bringing the flanges together slowly and parallel when installing a gasket and taking a minimum of four bolt tightening passes, following the correct bolt tightening sequence, there is a payoff in reduced maintenance costs and increased safety. Proper gasket thickness is also important. The thicker the gasket, the higher the gasket creep which in turn can result in torque loss. On standard ANSI raised face flanges a 1/16” thick gasket is normally recommended. Thinner gasket materials can take a higher gasket load and therefore higher internal pressures. Even when the installation is ideal, where the bolt stress is uniformly applied to each bolt, and the gasket is properly compressed, problems can still arise. Inherently with time, loosening will occur due to the factors already mentioned. If other factors such as cycling, thermal upsets, water hammer or just a piping system with inadequate pipe supports are present, periodic retorquing might be necessary. For problem areas, high temperature applications or where there is temperature cycling, or where a flange cannot be retorqued, conical spring washers have been found to be very helpful as an aid to torque retention. They act as a spring and help lessen the effects of torque loss. Other factors affecting torque loss include: 1. Rate of heat up 2. New vs. used bolts or studs 3. Use of hardened steel washers 4. Lubrication of bolts, nuts and nut facings 5. Method of bolt up. Order of efficiency from least to greatest: a. Wrench and cheater bar or sledge hammer b. Air impact gun c. Torque wrench d. Hydraulic torque wrench e. Hydraulic stud tensioners Finally, having the torque information for the gasket material is helpful as well. Please refer to the torque data that follows. GASKET INSTALLATION The importance of proper gasket installation cannot be stressed enough. The following is a basic explanation of how to properly bring the flanges together parallel and in stages, once the gasket is in place to properly compress the gasket. As a minimum, four passes are required. Using the right torque value for the lubricant being used to get the proper gasket compression is important as well. In the torque tables that follow for non-asbestos gasket materials, it is assumed the flanges are in good condition, anti-seize has not been used on any gasket contact surfaces and a proper installation technique such as what is outlined as follows is used. Never use any sheet gasket material as insulating washers in flange insulation kits. NOTE: As a general rule, soft gaskets are intended for service in Class 300 and below. 4 Page A Division of Bray International, Inc. The Ultimate Critical Service Triple Offset Valve F l a n g e B o l t i n g G u i d e GASKET INSTALLATION 1. Visually examine and clean flanges, bolts, nuts and washers. Replace components if necessary. 2. LUBRICATE the bolts, nuts and nut bearing surfaces. 3. Install the new gasket, bolts and nuts. Be sure gasket is properly centered. DO NOT REUSE old gasket, or use MULTIPLE gaskets. 4. Number bolts in cross-pattern sequence according to the appropriate sketch below. 5. IMPORTANT! HAND TIGHTEN; then SNUG BOLTS UP to 10/20 FT-LBS torque, but DO NOT EXCEED 20% of target torque. 6. Check gap for uniformity. 7. Starting at the #1 bolt, use the appropriate cross- pattern tightening sequence in the sketch below for Rounds 1, 2, and 3 and/or Round 4 (each sequence constitutes a “Round”). 4-bolt and 8-bolt flanges: 1 2 3 4 1 2 3 4 1 2 3 4 1 2 3 4 5 6 7 8 5 6 7 8 8 9 9 10 10 11 11 12 12 5 6 7 13 14 15 16 17 18 19 20 • Lubricate, hand tighten, then SNUG up bolts • Round 1 - Tighten to 25% of- final torque • Round 2 - Tighten to 50% of final torque • Round 3 - Tighten to 100% of final torque 12-bolt flanges and above: 1 2 3 4 1 2 3 4 1 2 3 4 1 2 3 4 5 6 7 8 5 6 7 8 8 9 9 10 10 11 11 12 12 5 6 7 13 14 15 16 17 18 19 20 • Lubricate, hand tighten, then SNUG up bolts • Round 1 - Tighten to 20% of final torque uploads/s3/ flange-bolting-guide.pdf