What is the torque loading of flange bolts?
Torque is the turning force measured in Newton metre (Nm) applied to tighten (turn) the nut on a bolt. In a bolted flange, the applied torque generates the axial load in the bolt. The bolt acts like a spring. Tightening the nut stretches the bolt, which increases the load on the gasket.
How do you calculate torque for a flange?
1. Bolt Stress (Gasket Seating) = Force per bolt (4) / Root Area of Bolt (3) = 12051 / 0.302 = 39,903 psi. This is the minimum bolt torque for a 6-inch class 150 flanged joint utilizing spiral wound gasket and ASTM A193 B7 bolts.
What is torque sequence?
Bolt tightening sequence or torque sequence is defined in the 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).
How is torque pattern calculated?
Begin with the formula T = K x U x D x P, where T is the torque, K is a standard representing 1.33, U is the coefficient of friction, D is the diameter of the fasteners, and P is the necessary preload.
How do you tighten a flange bolt?
Tightening sequence. The first pass, lightly tighten the first bolt then move directly across or 180 degrees for the second bolt, then move1/4 turn around the circle or 90 degrees for the third bolt and directly across for the fourth. Continue this sequence until all bolts are tightened.
How do you calculate flange force?
Fbu = T × 12/(k dnom) U.S. Customary Units (Equation 2) Where, F bu = Bolt force from torque, lbf. T = Torque, ft.lb. k = Nut factor, dimensionless dnom = Nominal bolt diameter, in. The total force on the flange from bolt-up becomes the force of a given bolt times the number of bolts.
How do you number bolts on a flange?
Before they are tightened, bolts can be numbered sequentially (1,2,3,4 etc) in a clockwise direction around the flange (fig 1 below). Or they can be numbered by the order of tightening (fig 2 below).
What is the torque for 5/8 Grade 8 bolt?
US Recommended Bolt Torque
| Size | Recommended Torque | |
|---|---|---|
| Grade 2 | 18-8 S/S | |
| 5/8″ | 73 | 93 |
| 3/4″ | 125 | 128 |
| 7/8″ | 129 | 194 |
What is the torque for 5/16 bolt?
ASTM A449 / SAE Grade 5*
| Bolt Size | TPI | Tightening Torque (ft lbs) |
|---|---|---|
| Plain | ||
| 5⁄16 | 18 | 17 |
| 3⁄8 | 16 | 31 |
| 7⁄16 | 14 | 49 |
When tightening flange bolts you should use a?
When tightening a four-bolt flange, use a criss-cross pattern.
What is the recommended torque for a flange bolt?
Flange Bolt Torque Guidelines Flange Size Recommended Torque (Ft. Lbs.) 1/2 – 1 1/12 10 – 15 2 – 4 20 – 30 6 -8 33 – 50 10 53 – 75
What is the size of a 150 lb flange?
The Flanges 150 LB As Per ANSI B 16.5are available between a size range of NPS 1/2 through NPS 24, with their requirements being provided in both metric and U.S units. Limited to flanges and relevant fittings, the Stainless Steel Flanges – ASME / ANSI Class 150made from forged, cast, or plate materials.
What is ASME Class 150 forged flanges thickness?
ASME B16.5 Class 150 Forged Flanges Thickness Buy 1/2 Inch, WN, SCH-10 * SCH-120, FF, Forged, RF, Carbon And Stainless Steel Flanges – ASME / ASME Class 150. What Is ASME B16.5 Class 150 Flange?
What are the dimensions of the flange fittings and flanges?
1-1/4 283 24″ 32 1-7/8 27-1/4 29-1/2 20 1-3/8 415 Fittings & Flanges ASME B16.9 Fittings ASME B16.11 Fittings ASME B16.5 Flange ASME B16.47 Flange Flange Dimension