Globe Valves – What is a Valve (Part – 2)

In the Valves Part-1, you learned, What is a valve, its history and its categorization, to read that article please click here. In this article, we will discuss about the valves categorized by design. The list follows as; Globe Valve Gate Valve Plug Valve Ball Valve Butterfly Valve Diaphragm Valve Pinch Valve Piston Valve Needle Valve Check Valve Relief & safety Valve Special Valve In particular, this article is going….

How To Make Weld Map, Shop Weld Plan, WPS, PQR & WPQ for A Static Pressure Vessel (Part-2)

Scope: In part-1 (Click here to read), of this article we had discussed about preparation and approval of weld map, shop weld plan and proposed welder list which needs to be submitted for consent of the customer/client/TPI. In this article, we shall discuss the steps required for PQR qualification. In general the Steps as mentioned below may be followed (But not mandatory for each and every case) for PQR qualification:….

Summary of ASME BPVC Section VIII Div 1 (Part 3)

In Part-2 of this article, the Subsection A was covered from UG-17 up to UG-35 Design and to read the Part-2 of this article please click here. This article will deal with the general requirements preceding from UG-36 onwards. Also note that the design calculation won’t be dealt within details and the readers are advised to refer the code for their specific type of vessel design. To read the Interpretations….

What is a Valve (Part – 1)

Introduction: Valves are mechanical devices, specifically designed to direct, start, stop, mix, or regulate the flow, pressure and temperature of process fluid. The need of Valve came after piping or plumbing. Plumbing dates back thousands of years in the civilization of human across globe. Valves can be found just about anywhere today, in our homes, under the street, in commercial buildings and in thousands of places within industrial and infrastructure….

Summary of ASME BPVC Section VIII Div 1 (Part 2)

In Part-1 of this article we had discussed about what ASME SEC VIII DIV I deals, code cases, scope, its use and body of the code. The Subsection A was covered up to UG-16 (Design) and to read the Part-1 of this article please click here. This article i.e part – 2 will deal with the general requirements preceding from UG-17 onwards. Please note that the design calculations won’t be….

How To Make Weld Map, Shop Weld Plan, WPS, PQR & WPQ for A Static Pressure Vessel (Part-1)

Scope: This article will deal with step by step guide for preparation of Weld Map, Shop Weld Plan, WPS, PQR & WPQ as per ASME SEC IX for a Static Pressure Vessel designed in accordance with ASME SEC VIII DIV I for non-lethal Service. The Reader must be wondering from where this requirement of Weld Map and Weld Plan arises which is very common thinking when one (Welding Engineer) is….

Summary of ASME BPVC Section VIII Div 1 (Part 1)

ASME SEC VIII DIV I deals with the rules for construction of pressure vessels. This code is a part of ASME BPVC Codes (Click here to learn about the various codes published by ASME). Code Cases are published regularly by BPVC committee to consider proposed additions and revisions to the code and to formulate cases to clarify the intent of existing requirements, when the need is urgent. These code cases will….

How to calculate heat input

Heat input is a critical parameter for arc welding processes. The Heat input shall be controlled to ensure sound weld quality. Heat input may be defined as “The amount of electrical energy that is supplied to a weld during the welding process”. How to calculate Heat input? There are several ways of calculating the heat input. We shall discuss the two most common methods of calculating the heat input. 1…..

Plasma Arc Welding (PAW)

Plasma arc welding (PAW) is an arc welding process in which the heat required for welding is generated by a constricted arc between a non-consumable electrode and the workpiece. Plasma Arc Welding is essentially an extension of Gas Tungsten Arc Welding (GTAW). Like GTAW, a non-consumable electrode is used in Plasma Arc Welding (PAW). However, a different technique is used to deliver the heat for welding in Plasma Arc Welding….

Acceptance Criteria for Weld Defects

Acceptance criteria for Visual Inspection (Refer: UIG-97, Page – 345 of of ASME BPVC Section VIII Div 1, 2017 Edition.) (a) The surface shall be free of any visible laminations, spalling, or cracks. Cracks in tubes shall not be repaired and shall be considered cause for rejection. (b) For tubes, scratches shall not exceed 1/32 in. (0.8 mm) in depth. For all other material, scratch depth shall not exceed 1/8….

Summary of ASME BPVC Section IX – Part 3

In part – 1 of this article, we had discussed the general requirements as mentioned in part QG of ASME Section IX, To read that article please click here. In part – 2 of this article we had discussed about the weld orientations, test positions for groove, fillet and stud welding etc. as mentioned in Part QW of ASME Setion IX. To read that article please click here. In the….

Summary of ASME BPVC Section IX – Part 2

In part – 1 of this article, we had discussed about the general requirements as mentioned in part QG of ASME BPVC Section IX. To read part – 1 of this article please click here. This article will cover the Part QW of ASME section IX, which is dedicated to the general requirements in the welding. Part QW is further divided into five articles, these are; Article 1. General requirements for….

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