What is the minimum distance to be maintained between two welds in a pipe?
Answer: - The general rule is that the minimum distance between adjacent butt welds should be 1D, and never less than 1-1/2". This is to avoid overlapping of Heat Affected Zones (HAZs). The minimum spacing between circumferential welds' centerlines must be at least four times the pipe wall thickness or 25 mm, whichever is greater. Neither ASME B31.3 nor ASME Section VIII provides specific guidance on this matter. Weld seams that are too close together can complicate the welding inspection process.
What is the basis of using of short radius & long radius elbow?
Answer: Long radius elbows are utilized for minimal pressure drops, while short radius elbows are employed for significant pressure drops. In the case of catalyst flows, long radius elbows are typically used.
Where Eccentric reducers or Concentric reducers should be used?
Answer: Eccentric reducers are used at pump suction points to prevent cavitation; using a concentric reducer can lead to the formation of air pockets, resulting in cavitation and potential pump damage. To circumvent this issue, an eccentric reducer with the flat side up (FSU) is utilized. Conversely, concentric reducers are employed at pump discharge points, in vertical pipelines, and other applications.
How are the pipe fittings classified based on end connections?
Answer: - Pipe fittings are categorized by their end connections as follows:
A. Socket weld fittings
B. Screwed end fittings
C. Beveled end or Butt weld fittings
D. Spigot socket fittings
E. Buttress end fittings
Success, what's next?
.jpg)
