Circumferential joints,

Longitudinal joints in cylinders are more highly stressed than circumferential joints, and the code takes this fact into account. When forming heads, there is usually some thinning from the original plate thickness in the knuckle area, and it is prudent to specify the minimum allowable thickness at this point. 

Butt weld with one plate offset—for circumferential joints only, see UW-13(c) and Fig, UW-13-l(k)... 

Circumferential joints only, not over 1 -inch thick and not over 24-in. outside diameter. 

Longitudinal joints not over xi-in. thick. Circumferential joints not over <-in. thick. 

Circumferential joints for attachment of heads not over 24-in. outside diameter to shells not over 14 in. thick. Circumferential joints for the attachment to shells of jackets not over in. in nominal thickness where the distance from the center of the plug weld to the edge of the plate is not less than 1 A times the diamter of the hole for the plug. 

Minimum thickness based upon longitudinal stress (circumferential joints)... 

Backing strip. Table UW12, UW 35 Circumferential joints. UW-3. UW-33. UW-35... 

Figure 52-12 Three different work areas, same day and time, on a piatform at the 780 foot level of a brick lining in a chimney, showing the surface of the work at the end of the shift by three different masons. All three left voids in joints, used too little mortar, and did not sufficiently cover the brick surface. Note shadows in center circumferential joint where mortar has subsided into a void below.

Side plates, rectangular vessels. UW-13. Appx I3 Opening in fiat heads. UG-39 Welced flat heads. UG-34. UW-i3. ULW-17 Corner joints. UG-93. UW-9.13.18 Cat. S circumferential joints, UW-2.3.9 12 33. 

The dam was built in blocks, or vertical columns, varying in size fiom approxunately 60 ft square at the upstream fece of the dam to about 25 ft square at the downstream face. Adjacent columns were locked together by a system of vertical keys on the radial joints and horizontal keys on the circumferential joints. After the concrete was cooled, a cement and water mixture called grout was forced into the spaces created between Ae columns by Ae contraction of Ae cooled concrete to form a monolithic (one-piece) structure. 

Class II Vessels—commonly used in chemical process industries. All longitudinal and circumferential joints should be radiographed. 

D) Circumferential joints in ductwork shall be substantially fastened together and lapped in the direction of airflow. At least every fourth joint shall be provided with connecting flanges, bolted together, or of equivalent fastening security. 

They are made from terylene, a smooth fibre which does not retain dust (q.v.). Overarching. A progressive departure of circumferential joints in arches or rings from the required radial alignment. Sometimes due to the use of too many sharply tapered bricks. 

Underarching. Underadjustment of the circumferential joints from true radial alignment in brick arches or rings. It may be due to the use of too many slow taper bricks. 

The equations for a right circular cylinder for the longitudinal stress acting on the circumferential joints follow. 

The previous two examples on lining expansion allowance used a blanket material laid in the circumferential direction between the lining cold face and the vessel shell plate. The expansion allowance can also be used in the radial joints in the brick lining. The relationship between the use of the circumferential allowance in the circumferential joint and the expansion allowance used in the radial brick joints originates with the basic equation of the circle ... 

The expansion allowance in the circumferential direction AC (in the brick radial joints) and the expansion allowance in the radial direction A/ (in the circumferential joint between the lining and shell) is... 

In cylindrical refractory hnings, expansion allowance can be used in the radial brick joints or in the circumferential joints. The relationship between the expansion allowance used in the radial joints for circumferential expansion allowance (Ac) and expansion allowance used in the circumferential joints for radial expansion allowance (Ar) is defined by the equation... 

That is, the expansion allowance used in the radial joints is an expansion allowance that affects the circumferential growth of the lining, whereas the expansion allowance used in the circumferential joint affects the radial growth of the Uning. 

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