FLANGE BOLTING GUIDE

FLANGE BOLTING GUIDEThe Ultimate Critical Service Triple Offset Valve

Flange Bolting GuideA Division of Bray International, Inc.The Ultimate Critical Service Triple Offset ValveContentsExamples of Typical Flange to Valve Bolting3Torque Loss4Gasket Installation2Page4-5Tightening Methods5Class 150 Double FlangeFace To Face API 609, Iso 5752 Basic Series 13 Body Drilling Ansi B16.56Class 150 Double FlangeFace To Face API 609, Iso 5752 Basic Series 13 Body Drilling Ansi B16.47 Series A6Class 150 Double FlangeFace To Face API 609, Iso 5752 Basic Series 13 Body Drilling Ansi B16.5 Series B6Class 300 Double FlangeFace To Face API 609, Iso 5752 Basic Series 13 Body Drilling Ansi B16.57Class 300 Double FlangeFace To Face API 609, Iso 5752 Basic Series 13 Body Drilling Ansi B16.47 Series A7Class 300 Double FlangeFace To Face API 609, Iso 5752 Basic Series 13 Body Drilling Ansi B16.47 Series B7Class 600 Double FlangeFace To Face API 609, Iso 5752 Basic Series 14 Body Drilling Ansi B16.58Class 900 Double FlangeFace To Face ISO 5752 Basic Series 8 Body Drilling Ansi B16.58Class 150 Gate Face To FaceFace To Face API 609, Asme B16.10 Body Drilling Ansi B16.59Class 150 Gate Face To FaceFace To Face API 609, Asme B16.10 Body Drilling Ansi B16.47 Series A9Class 300 Gate Face To FaceFace To Face API 609, Asme B16.10 Body Drilling Ansi B16.59Class 150 LugFace To Face API 609 Body Drilling Ansi B16.510Class 300 LugFace To Face API 609 Body Drilling Ansi B16.510Class 150 WaferFace To Face API 609 Body Drilling Ansi B16.511Class 300 WaferFace To Face API 609 Body Drilling Ansi B16.511Page

FlangeFlangeValve BodyL1L1Flange Bolting GuideWasherA D i v i s i o n o f B r a y I nWasherternational, Inc.The Ultimate Critical Service Triple Offset ValveMinimum Bolt EngagementMust Be Equal to Diameter of BoltExamples of Typical Flange to Valve BoltingDoubleFlange/GateL1 Stud Bolt LengthWafer BodyL1 StudBodyBolt LengthGasketGasketGasketGasketValve BodyValve WasherL1Caution: To ensure proper installationrefer to appropriate table within this guidefor specific valve drilling information.Lug Body L1 Stud Bolt LengthGasketL2 Stud Bolt LengthGasketL2L3 Hex Bolt LengthValve BodyFlangeFlangeValve BodyL3L1L2 or L3 specifies special stud lengthsfor hub and neck locations, that do notpermit thru holes.L1WasherWasherMinimum Bolt EngagementMust Be Equal to Diameter of BoltWafer Body L1 Stud Bolt LengthDouble Flange/Gate Body L1 Stud Bolt LengthGasketGasketGasketGasketValve BodyValve L1Washer* Lug Threads may be tapped from both sides and therefore tap may not be continuous.Lug Body L1 Stud Bolt LengthAll 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.GasketGasketPage3

Flange Bolting GuideA Division of Bray International, Inc.The Ultimate Critical Service Triple Offset ValveTORQUE LOSSTorque loss is inherent in any bolted joint. The combinedeffects of bolt relaxation, (approximately 10% during thefirst 24 hours after installation), gasket creep, vibrationin the system, thermal expansion and elastic interactionduring bolt tightening contribute to torque loss. Whentorque loss reaches an extreme, the internal pressureexceeds the compressive force holding the gasket inplace and a leak or blow-out occurs.A key to reducing these effects is proper gasketinstallation. By bringing the flanges together slowly andparallel when installing a gasket and taking a minimumof four bolt tightening passes, following the correctbolt tightening sequence, there is a payoff in reducedmaintenance costs and increased safety.Proper gasket thickness is also important. The thickerthe gasket, the higher the gasket creep which in turncan result in torque loss. On standard ANSI raised faceflanges a 1/16” thick gasket is normally recommended.Thinner gasket materials can take a higher gasket loadand therefore higher internal pressures.Even when the installation is ideal, where the bolt stress isuniformly applied to each bolt, and the gasket is properlycompressed, problems can still arise. Inherently withtime, loosening will occur due to the factors alreadymentioned. If other factors such as cycling, thermalupsets, water hammer or just a piping system withinadequate pipe supports are present, periodic retorquingmight be necessary.For problem areas, high temperature applications orwhere there is temperature cycling, or where a flangecannot be retorqued, conical spring washers have beenfound to be very helpful as an aid to torque retention. Theyact as a spring and help lessen the effects of torque loss.4PageOther factors affecting torque loss include:1. Rate of heat up2. New vs. used bolts or studs3. Use of hardened steel washers4. Lubrication of bolts, nuts and nut facings5. Method of bolt up.Order of efficiency from least to greatest:a. Wrench and cheater bar or sledge hammerb. Air impact gunc. Torque wrenchd. Hydraulic torque wrenche. Hydraulic stud tensionersFinally, having the torque information for the gasketmaterial is helpful as well. Please refer to the torquedata that follows.GASKET INSTALLATIONThe importance of proper gasket installation cannot bestressed enough. The following is a basic explanation ofhow to properly bring the flanges together parallel and instages, once the gasket is in place to properly compressthe gasket. As a minimum, four passes are required.Using the right torque value for the lubricant being usedto get the proper gasket compression is important as well.In the torque tables that follow for non-asbestos gasketmaterials, it is assumed the flanges are in good condition,anti-seize has not been used on any gasket contactsurfaces and a proper installation technique such as whatis outlined as follows is used. Never use any sheet gasketmaterial as insulating washers in flange insulation kits.NOTE: As a general rule, soft gaskets are intended forservice in Class 300 and below.

Flange Bolting GuideA Division of Bray International, Inc.The Ultimate Critical Service Triple Offset ValveGASKET INSTALLATION12-bolt flanges and above:1 and clean flanges, bolts,1 nuts and1. Visually examine8washers. Replace components if necessary. 5412144. Number bolts in cross-pattern sequence accordingto the appropriate sketch below.5. IMPORTANT! HAND TIGHTEN; then SNUGBOLTS UP to 10/20 FT-LBS torque, but DO NOTEXCEED 20% of target torque.6. Check gap for uniformity.7. Starting at the #1 bolt, use the appropriate crosspattern tightening sequence in the sketch below forRounds 1, 2, and 3 and/or Round 4 (each sequenceconstitutes a “Round”).3102 3106227 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 torque931561411211197Rotational Round - 100% of Final Torque (same asRound 3 or 4 above). Use ROTATIONAL, clockwisetightening sequence, starting with Bolt No. 1, forone complete round and continue until no further nut1 occurs at 100% of 20121rotationthe12FinalTorque value1385516for any nut.94317Check gap around the circumference between each ofthese rounds, measured at every other bolt. If the gap isnot reasonably uniform around the circumference, makethe appropriate adjustments by selective bolt tighteningbefore proceeding.845 Lubricate, hand tighten, then SNUG up bolts Round 1 - Tighten to 20% of final torque Round 2 - Tighten to 40% of final torque Round 3 - Tighten to 80% of final torque Round 4 - Tighten to 100% of final torque54131876181104-bolt and 8-bolt flanges:112463. Install the newgasket, bolts and nuts. 2Be sure7 gasket2is properly centered. DO NOT REUSE old gasket,or use MULTIPLE gaskets.2016942. LUBRICATE the bolts, nuts and nut bearing33surfaces.8586417910Final Round - RETORQUE.After twenty-four3hours repeat 3Round 318or 4 (above) followedby a156Rotational 7Round. Tests showthat a 7large percent142 11 19112age of the short-term bolt preload loss occurs withintwenty-four hours after initial tightening. This Roundrecovers this loss. This is especially IMPORTANTfor PTFE gaskets.Tightening Methods Hand Wrench Manual Torque Wrench Hydraulic Torque Wrench Impact Wrench OtherPage5

Flange Bolting GuideA Division of Bray International, Inc.The Ultimate Critical Service Triple Offset ValveCLASS 150 DOUBLE FLANGEVALVE 50500600StudDiameter/Thread5/8” - 11 UNC5/8” - 11 UNC3/4” - 10 UNC3/4” - 10 UNC7/8” - 9 UNC7/8” - 9 UNC1” - 8 UNC1” - 8 UNC1 1/8” - 8 UN1 1/8” - 8 UN1 1/4” - 8 UNFace to Face API 609, ISO 5752 Basic Series 13 Body Drilling ANSI B16.5Stud Bolts - 404248750800900100010501200StudDiameter/Thread1 1/4” - 8 UN1 1/2” - 8 UN1 1/2” - 8 UN–1-1/2” - 8 UN1 1/2” - 8 r/Thread3/4” - 8 UNC3/4” - 8 UNC7/8” - 8 UNC1” - 8 UNC1” - 8 UNC1” - 8 UNCPLUSORInmmQtyNuts 2Face to Face API 609, ISO 5752 Basic Series 13 Body Drilling ANSI B16.47 Series AStud Bolts - 524852–6272CLASS 150 DOUBLE FLANGEVALVE SIZE Hex Head Bolts - L3 TOTALTOTALNuts &WashersCLASS 150 DOUBLE FLANGEVALVE SIZEStud Bolts - L2Stud Bolts - L2 PLUSTOTALInmmQtyNuts 108104116–134160Hex Head Bolts - L3 TOTALORInmmQtyNuts ��101610496104–124144Face to Face API 609, ISO 5752 Basic Series 13 Body Drilling ANSI B16.5 Series BStud Bolts - Stud Bolts - L2 PLUSTOTALInmmQtyNuts 201010166176160156182182Hex Head Bolts - L3 TOTALORInmm3.53.5444.254.258989102102108107.95Nuts &Qty .6Any combination of the above fastener types is applicable.All nuts are in accordance with ANSI B18.2.2 Table 9 Heavy Hex nuts.All Studs are in accordance with ANSI B18.2.1.All Stud and bolt lengths rounded to next 1/4”.Page5. Calculations include 2 washers(.2”) for thru stud bolts and 1 (.1”) washerfor hex bolt and stud bolts/nut.6. Standard gaskets(0.125”), one per side, have been included in the boltingcalculations.

Flange Bolting GuideA Division of Bray International, Inc.The Ultimate Critical Service Triple Offset ValveCLASS 300 DOUBLE FLANGEVALVE 50500600StudDiameter/Thread3/4” - 10 UNC3/4” - 10 UNC3/4” - 10 UNC7/8” - 9 UNC1” - 8 UNC1 1/8” - 8 UN1 1/8” - 8 UN1 1/4” - 8 UN1 1/4” - 8 UN1 1/4” - 8 UN1 1/2” - 8 UNFace to Face API 609, ISO 5752 Basic Series 13 Body Drilling ANSI B16.5Stud Bolts - er/Thread1 3/4” - 8 UN–2” - 8 UN–1 5/8” - 8 UN1 7/8” - 8 r/Thread1 3/8” - 8 UN–1 5/8” - 8 UN–1 3/4” - 8 UN1 7/8” - 8 UNPLUSORInmmQtyNuts ace to Face API 609, ISO 5752 Basic Series 13 Body Drilling ANSI B16.47 Series AStud Bolts - L1Stud Bolts - 740–48–5248CLASS 300 DOUBLE FLANGEVALVE SIZE Hex Head Bolts - L3 TOTALTOTALNuts &WashersCLASS 300 DOUBLE FLANGEVALVE SIZEStud Bolts - L2 PLUSTOTALInmmQtyNuts –121696–112–116144Hex Head Bolts - L3 TOTALORInmmQtyNuts 0–96–10496Face to Face API 609, ISO 5752 Basic Series 13 Body Drilling ANSI B16.47 Series BStud Bolts - 37556–56–5660Stud Bolts - L2 PLUSTOTALInmmQtyNuts 1620128–120–128140Hex Head Bolts - L3 TOTALORInmmQtyNuts ��8–1620112–112–112120NOTES:1.2.3.4.Any combination of the above fastener types is applicable.All nuts are in accordance with ANSI B18.2.2 Table 9 Heavy Hex nuts.All Studs are in accordance with ANSI B18.2.1.All Stud and bolt lengths rounded to next 1/4”.5. Calculations include 2 washers(.2”) for thru stud bolts and 1 (.1”) washerfor hex bolt and stud bolts/nut.6. Standard gaskets(0.125”), one per side, have been included in the boltingcalculations.Page7