Hold-down Bolting to Resist Shaking Forces and ... - Ariel Corporation

ENGINEERING REFERENCEThe contents of this document are proprietary and confidential. They are theproperty of Ariel Corporation and may not be disclosed, reproduced, or used formanufacture in part or in whole without written permission from Ariel Corporation.Hold-down Bolting to Resist Shaking Forces andCouples in Reciprocating CompressorsRequirements1. To use the torques in the tables, the ultimate strength (Su) of the stud material must equal or exceed100,000 psi (690 MPa); higher strength stud material is preferred. In all cases, torque the nuts tostress the stud to about 55% of the ultimate strength of the stud material; higher strength materialsrequire higher torques than shown in the tables. Material strength and torque are directly proportional.Example: for 120,000 psi (825 MPa) ultimate strength material: 120,000 ÷ 100,000 = 1.2 xmin. torque from table = required torque for given nut size. To use a different stud diameter, consultAriel for feasibility and torque.2. Compressor frame foot hold-down studs and crosshead guide to support bolting should be as longas possible. Ariel recommends a minimum 12 to 1 length to diameter ratio.NOTE: Bolting long enough to reach only through the compressor foot and a deck plateor flange of an I-beam can loosen if not provided with engineered devices to maintainbolt pre-load.3. Tighten nuts as recommended above to maintain fastener pre-load during operation. Ariel also recommendsrolled threads and hardened spherical washers for hold down bolting to help compensatefor fastener to frame bolt surface angular misalignment.4. Use grade 8 or 9 bolting to hold crosshead guides to supports.5. Re-preserve any fasteners subject to corrosion after installation.6. Follow lubrication guidelines and recommended procedures for torque accuracy in ER-63.For the most recent edition of this document, visit www.arielcorp.com.15Transferred document to Flare, Added links to referenced documents. Added "F" toall references of JGC:D frames.14 018450 9-21-1213 015759 8-11-1012 016442 7-8-1011 016770 6-9-1010 015403 9-29-08 15 019144 11-6-13REV DESCRIPTION REV EC DATE REV EC DATEPage 1 of 2 REV 15 ER-26

ENGINEERING REFERENCEThe contents of this document are proprietary and confidential. They are theproperty of Ariel Corporation and may not be disclosed, reproduced, or used formanufacture in part or in whole without written permission from Ariel Corporation.TABLE 1 Hold-down Bolting - Minimum Torques aCompressorModelHole Diameterinch (mm)Frame FootRecommendedStud Sizeinch--TPIMinimum NutTorque clb-ft (N•m)Crosshead Guide to Support bBolting Sizeinch--TPIBolting Torquelb-ft (N•m)JGI 7/8 (22) 3/4--10 175 (235) --- ---JGM:N:P:Q 3/4 (19) 5/8--11 100 (130) 5/8--11 90 (120)JG:A 7/8 (22) 3/4--10 175 (235) 5/8--11 90 (120)ACF d , JGR:J 1 (25) 7/8--9 280 (380) 3/4--10 160 (215)JGW 1 (25) 7/8--9 280 (380) 5/8--11 90 (120)JGH:E 1-1/4 (32) 1-1/8--7 600 (805) 7/8--9 255 (345)JGK:T e 1-1/4 (32) 1-1/8--7 600 (805) 1--8 380 (515)JGC:D:F 1-1/2 (48) 1-3/8--6 1100 (1500) 1-1/4--7 765 (1040)JGZ:U 1-7/8 (48) 1-3/4--5 2300 (3100) 1-1/4--7 765 (1040)KBZ:U 1-7/8 (48) 1-3/4--5 2300 (3100) 1-1/4--12 780 (1055)JGB:V, KBB:V 1-7/8 (48) 1-3/4--5 2300 (3100) 1-1/2--6 1340 (1815)a. See #1, "Requirements".b. Not applicable to directly-opposed compressors.c. When using a stud pitch other than those listed above in the same nominal diameter size, use this formula to determinerequired torque: Torque = (TABLE 1 fastener torque) x (target fastener root area ÷ TABLE 1 fastener rootarea).d. For directly-opposed compressors, use frame foot values.e. For JGT compressors with ET crosshead guides, use the 7/8”–9 TPI bolting size in TABLE 1 as a minimum torque tobolt the crosshead guide to the support.TABLE 2 Crosshead Guide Support Foot Hold-down Bolting - Minimum Torques aCompressor ModelJGM:N:P:Q:IHole Diameterinch (mm)Recommended StudSize, inch--TPIN/AMinimum Nut Torque b lbft(N•m)JG:A 3/4 (19) 5/8--11 100 (130)JGR:J:W 1 (25) 7/8--9 280 (380)JGH:EK:T 1-1/4 (32) 1-1/8--7 600 (805)JGC:D:F:Z:U 1-1/2 (38) 1-3/8--6 1100 (1500)JGB:V, KBB:V:Z:U 1-7/8 (48) 1-3/4--5 2300 (3100)a. See #1, "Requirements".b. When using a stud pitch other than those listed above in the same nominal diameter size, use this formula to determinerequired torque: Torque = (TABLE 2 fastener torque) x (target fastener root area ÷ TABLE 2 fastener rootarea).Page 2 of 2 REV 15 ER-26