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The joint bevels shall be prepared in accordance with the registered and approved weld procedure. Internal and external surfaces to be welded shall be clean and free from paint, oil, rust and scale.
Stamp the welder's identification symbol adjacent to all pressure welds with low stress stamp in carbon and low alloy steels with wall thickness of 6.4 mm (1/4") or greater. For flanged joints where the pipe wall thickness is less than 6.4 mm (1/4"), stamp the welders identification on the edge of the flange. When both members of a weld are less than 6.4 mm (1/4") thick, the welder's identity shall be recorded in a permanent written record.
For austenitic stainless steels, high alloy steels and non-ferrous metals, the welder's symbol shall be applied with waterproof paint.
The permanent marking material used on austenitic stainless steels and non-ferrous alloys shall not contain any harmful metal, metal salts, or elements such as zinc, lead, chlorides, sulphur, and other low melting point metals. Submit type of paint or ink including analysis of the above elements for OWNER's approval.
Copper Alloys Some alloys of copper are employed in industry for varying causes. Copper forms alloys along with zinc or the brasses, tin or the bronzes, along with tin and pho
Choose a wire rope for a vertical mine hoist to lift a load of 55 kN from a depth of 300 metres. A rope speed of 500 metres/min is to be attained in 10 seconds.
Objectives After studying this section, you should be capable to: define basic nature of plastics, differentiate between various types of plastics, define polym
Q. What is the procedure of hot working? A process is defined as hot working if it takes place when the workpiece is above the recrystallization temperature. Hot Working Ad
Question 1: A good display of the merchandise is the result of planning, cooperation and coordinating. A good schedule of work is important for a good design with the use of me
EQUIPMENT FOR RESISTANCE WELDING-Single phase vs three phase The resistance welding machines can be connected either across 440 V mains (across two lines) or three phase mains.
mean effective pressure of dual cycle
Q. Illustrate the process of insulation on pipe? Factory fabricated sectional pipe insulation shall be applied in staggered joint construction and secured with wire loops or ba
Product life-cycle management: There have also been changes in the use of some pre-existing data formats. Open associations have been formed to encourage some formats to becom
ROTARY CONVERTERS Historically, these type of power sources were developed first for arc welding applications and even now these types are popular. These rotary converters are of
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