Welding, double

API 5L A Electric resistance welded, double submerged-arc welded 30,000 psi... 

Welded double concentric tube or double tube sheet with tri-clamp sanitary fittings (tube side)... 

Heat exchangers, other than the welded double-concentric-tube type or double-tube sheet type, must employ a pressure differential and a means for monitoring the differential. The pressure differential shall be such that the fluid requiring a higher microbial quality shall be that with the greater pressure. Written records of the pressure differential monitoring shall be maintained as required in 212.183... 

Lap fillet weld Double V butt Corner weld weld... 

Electric weld or submerged arc weld Grade A. Open hearth, electric furnace or basic oxygen. Electric resistance weld or submerged arc weld, double side. Not required... 

Double ring structure with connecting beams, similar to Equisetum hyemale, constructed out of welded double T-beams. 

The pump is equipped with all-welded, double-ball, gravity-operated suction and discharge check valves. The 1-in. balls operate in close-fitting cages (0.010-in. diametral clearance) which maintain the alignment of the ball and scat and restrict the ball lift to 0.125 in. 

The radiographs were made from austenitic (titanium- or niobium-stabilised nickel chromium steels) welds that were double-wall penetrateted by x-rays of 130kV. The wall thiekness is in the range of 8 to 12 mm. 

In fig, 4 local corrosion by erosion is shown in a pipe with a bore of 100 mm behind a welding. In this case only the nominal wall thickness of the pipe is known (6.3 mm). To calibrate the obtained density changes into wall thickness changes a step wedge exposure with a nominal wall thickness of 13 mm (double wall penetration in the pipe exposure) and the same source / film system combination was used. From this a pcff = 1-30 1/cm can be expected which is used for the wall thickness estimation of the pipe image according to equation (4). 

Pig. 10. Double-v inlay, batten-strap technique for fusion welding of an explosion-clad plate containing titanium and zirconium. 

Butt-welded joint, reducer, or weld-neck flange Double-welded slip-on flange Fillet welded joint or pocket-weld flange... 

Other types of plate-and-frame heat exchangers are double-wall-plate exchangers, welded-plate exchangers, wide-gap-plate exchangers, and brazed-plate exchangers. Each type is briefly described below. 

Figure 10-158B. Platecoil double- and single-embossing designs for standard units. The Platecoil is fabricated using resistance, spot, seam, and Tungsten Inert Gas (TIG) and/or Metal Inert Gas (MIG) welding techniques in order to hold and seal the two plates together. (Used by permission Cat. 5-63, 1994. Tranter , Inc.)...

Figure 10-158A. Styles of Mueller Temp-Plate heat transfer plates. (1) Double-embossed surface, inflated both sides. Used in immersion applications, using both sides of the heat transfer plate. (2) Single-embossed surface, inflated one side, used for interior tank walls, conveyor beds. (3) Dimpled surface (one side), available MIG plugwelded or resistance spot welded. Used for interior tank walls, conveyor belts. (Used by permission Bui. TP-108-9, 1994. Paul Mueller Company.)...

Install a two-bottle filter system for the 10 in. X 14 in. double-acting compressor, each bottle to be 16 in. c ) X /g in. W.T X 3 ft-6 in. long with weld caps. Install a 2 in. Sch. 40 choke-tube between bottles 20 ft total length. Install 90° elbows or baffles at entrance and exit of each bottle. 

Acetylenes contain at least one triple bond. The triple bond is even more reactive than a double bond and, therefore, acetylene is used industrially to make other compounds used in rubber and plastics. Acetylene burns in oxygen to produce a very hot flame used for welding and metal cutting (oxy-acetylene torch). 

Ethane, a component of natural gas, contains a C—C single bond. Ethylene, widely used to make plastics, contains a CDC double bond. Acetylene, used as fuel for welding torches, contains a CDC triple bond. 

When the bottom plates are welded together, the coating is partially destroyed. Research and field work showed that protection can be achieved using volatile corrosion inhibitors under the tank [688]. This works alone or in combination with cathodic protection. Double tank bottoms for leakage monitoring are often specified for new tanks. However, the same problem of coating destruction occurs. Volatile corrosion inhibitors are an excellent solution from both a technical and an economic standpoint. This type of corrosion inhibitor... 

Figure 12.67. Double-pipe exchanger (constructed for weld fittings)...

The correct form to use for a given joint will depend on the material, the method of welding (machine or hand), the plate thickness, and the service conditions. Double-sided V- or U-sections are used for thick plates, and single V- or U-profiles for thin plates. A backing strip is used where it is not possible to weld from both sides. Lap joints are seldom used for pressure vessels construction, but are used for atmospheric pressure storage tanks. 

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