2019 08 26 nbsp 0183 32 8 26 2019 Bolt pretensioning of pressure vessel anchor bolts are done the same way as anchor bolts for structural columns The turn of the nut method has been used for decades There are also other methods approved by AISC Turn of the nut method requires inspection and marking of both snug and turned bolts
ASTM A193 Grade B8M Class 1 is a standard material specification for corrosion resistant 316 stainless steel fasteners such as bolts screws studs threaded rods and other externally threaded parts for use in high tensile high temperature and special purpose applications such as pressure piping amp pressure vessels bolting Grade B8M Class is a carbide solution treated
2004 07 20 nbsp 0183 32 Typically we would expect the anchor bolts to be tightened to about 4 arm grunts Two hands on the wrench tighten till you grunt twice Any pretensioning would have to be very explicitly defined and Inspection or Engineering would have to personally witness the torquing to have any confidence in the installation jt TomBarsh Structural OP
2021 04 16 nbsp 0183 32 2 To reduce sizes of anchor bolts Increase number of anchor bolts Use higher strength bolts Increase width of base plate 3 Number of anchor bolts should always be a multiple of 4 If more anchor bolts are required than spacing allows the skirt may be angled to provide a larger bolt circle or bolts may be used inside and
Bolting torque to develop 50 Bolt Yield Stress at Nut Factor K 0 16 This Table is applicable to Never Seize paste and Fel Pro lubricant K 0 16 The above Table is applicable only for ASTM A320 Grade L7 A193 Grade B7 and A193 Grade B16 Stud Bolts The torque values are approved for spiral wound graphite and PTFE filled gaskets graphite sheet gaskets GHE and
2011 12 17 nbsp 0183 32 The f or force portion from our torque equation is composed of two major parts as noted by the design rules for raised face pipe flanges in the Boiler and Pressure Vessel Code First is the force needed to compress and hold the gasket in place The load generated by the bolts has to compress the gasket so it conforms to the flange surfaces and to quot seat quot the
How tight do anchors must be torqued for adhesive anchors Installation adhesive epoxy torque 0
2021 01 15 nbsp 0183 32 The bolts are quenched and tempered a k a heat treated to develop the desired tensile strength mechanical properties Grade B7 Stud Bolts are used in pressure vessels that do not need corrosion resistance aren t susceptible to stress corrosion cracking and for temperatures typically less than 750F
The part is a bulkhead for a pressure vessel and has a transparent viewing window installed in it We need to replace the window which will involve removing bolts which are torqued to an unknown value Since we will need to re torque the bolts to the same value when we re install the bolts I need to figure out what they are torqued to now My initial thought was to use a
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
The internal pressure on manway covers can exceed the compressive force of the bolts serving to seat and load the gasket Pressure vessels commonly utilize internally seating and sometimes hinged doors for interior access Such doors must be oriented so the internal system pressure generates sufficient stress to seat the manway gaskets As the internal pressure increases
HG operating is the force required to keep the flange sealed against the operating pressure It is generated by tightening the bolts Load effective area x gasket factor m x Pressure If the flange is self energizing does not need additional force to
2022 01 07 nbsp 0183 32 Design Of Base Details For Vertical Vessels Ab required area of anchor bolts in 2 Bj anchor bolt diameter in Bp allowable bearing pressure psi see Table 3 35 bp bearing stress psi C compressive load on concrete lb d diameter of bolt circle in db diameter of hole in base plate of compression plate or ring in
2010 12 28 nbsp 0183 32 Engineers working with pressure vessel and piping bolted joints often face the question of which assembly bolt is more appropriate Appendix O Assembly Bolt Load Selection outlines two methods of determining the appropriate assembly bolt load for a given joint The other significant conundrum involves diagnosing cause s of leaks The
2016 11 17 nbsp 0183 32 extremechanical Mechanical OP 18 Nov 16 17 12 Hi One of the spec says once pressure vessels are installed on foundation Anchor bolts are concrete bound nuts have to be torqued to a pre determined value Specification gives tensioning values based on Anchor bolts dia and Material
2011 10 31 nbsp 0183 32 Final Survival Plan General Home Preparedness for You and Your Family
The thin nut should be placed on the bolt first This nut is typically tightened to between 25 to 50 of the overall tightening torque The second thick nut is then placed on the bolt and the thin nut held to prevent rotation by a spanner whilst the thick nut is tightened to the full torque value The series of diagrams show the effect that
2019 01 30 nbsp 0183 32 You can both over and under torque a bolt According to the US military s report their drone had screw caps 18 22 inch pounds above prevailing torque allowing the cap screws to loosen in flight 4 Typically an under torqued bolt will deform and be unable to provide as much clamping force as needed An over torqued bolt will break
All stud bolts of 7 8″ and above shall be tightened using a torque wrench While tightening the bolt with torque wrenches for pipe Manway flanges ensure that tightening load to each bolt is applied as uniformly as possible The tightening shall be carried out in three or four stages in steps of 30 50 amp 70 percent of the final torque value A fourth stage again uses 70 percent of
2015 03 18 nbsp 0183 32 Anchor bolts are not in the scope of ASME As you mentioned ASTM F1554 is the typical anchor rod for vessels on concrete but for vessels sitting on a steel structure I ve seen ASTM A325 called out You need to check the calcs done by the vendor If they called out SA 325 for the anchor bolts they might have used a higher allowable bolt
2008 06 27 nbsp 0183 32 This quot pressure quot will also be the tension in the bolt If you need to go to a specific quot pressure quot just tighten the nut until you get that sum 2 reading and note the torque Make a note of the torque required for that particular nut and bolt pair Go on to the next nut and bolt pair The total quot pressure quot under several bolts will be the sum of the quot pressures quot under each bolt A
From pressure vessels to heat exchangers our bolting process is guaranteed on a variety of applications Our bolting specialists are trained in accordance with ASME PCC 1 specifications They perform torquing and tensioning on bolts with a diameter of anywhere from 5 8 of an inch to 5 inches We ve also earned a reputation in the industry for consistently delivering on leak
ASTM A193 This specification covers alloy steel and stainless steel bolting material for pressure vessels valves flanges and fittings for high temperature or high pressure service or other special purpose applications ASTM A193 B7 Alloy steel AISI 4140 4142 quenched and tempered IV Surface Treatments We can provide the ASTM A193 B7 stud bolt with 2 ASTM
Stronger anchor bolts with greater diameter need to be used if the load is attached overhead on a wall Smaller diameter less deeply embedded anchor bolts can be used for loads that are fastened with on edge resting on the ground Loads Fastened to Concrete Overhead Loads fastened to concrete overhead are essential to consider when choosing the anchor bolts for
Anchor bolts do break from time to time The ability REPAIR PROCEDURES to make a quick repair is essential to minimizing downtime Two very important considerations are The most effective way to repair an anchor bolt is to cut off the old bolt low enough below the equipment base so the replacement top section length will be at least 10 to 12 bolt diameters Do not
Hardened steel washers are used in many structural connections to spread pressure from the bolt tightening process over a larger area Washersmay also be used to cover an oversized or slotted hole RCSC 2000 Flatwashers are mostcommonly used Tapered washers above left are used when the surface being bolted has a sloped surface such as the flange of a channel
In petrochemical facilities anchor bolts are used to fasten process vessels or machines to a foundation structure thus allowing the loads to be transmitted to the foundation and ultimately to the earth As with concrete infrastructure all too often anchor bolts are taken for granted and the thought of providing a maintenance budget for these critical fasteners is more often an
An anchor bolt diameter ranges from 3 8 inch to 1 inch or more and the length runs from roughly 6 inches to greater than 3 feet While sizing requirements vary according to local code 1 2 inch diameter embedded at least 7 inches is usually the minimum If your local regulations call for bolts to embed at least 7 inches below the foundation s
how will i know when i need to use torque controlled anchor rods portland bolt introduction williams form installation operation and maintenance instructions torque tension relationship for a307a grade 5 8 amp 9 bolts anchor bolt torque values www engineersedge com this document is a summary of bolt tensioning torque bar for wedge anchor kwik bolt 174 3 hilti
2003 12 23 nbsp 0183 32 Also the nut and washer surface should be lubricated if they are not coated bolts being used for the first time coated being a low friction coating for flange bolts to reduce the friction between them and thereby increase the bolt preload achieved by a given torque Also as mentioned by uncleysd the washer should be hardened note though it should be through