Piping engineer interview questions For piping engineer interview questions (material Engg) Below are the basic questions asked in piping engineer interview questions 1.Can you explain in detail three or more major differences between code ANSI B31.1 and code ANSIB31.3? Answer: There is only one major difference between the two, B31.1 is for Power Piping, and … Read more
Copper-Nickel Material All copper-nickel piping as a minimum shall be supplied in 16-bar system. Velocity in Cu-Ni piping shall not exceed 1.6 m/sec for 2″ NB and below and 3.3 m/sec. for 3″ NB and above. Fluid velocities in copper piping shall not exceed 1.5 m/sec. Design of Cu-Ni piping system shall be such as … Read more
Chlorinated Poly Vinyl Chloride CPVC has become an important engineering thermoplastic due to its relatively low cost, high heat deflection temperature, chemical inertness and outstanding mechanical, dielectric, and flame and smoke properties. At basic level, CPVC is a PVC homopolymer that has been subjected to a chlorination reaction. One of the most attractive features of … Read more
Scale Coupons: corrosion coupons are small pieces of metal that are exposed to a corrosive environment in order to measure the rate of corrosion. They are typically made of the same material as the equipment that is being monitored, and they are placed in the same environment. The coupons are weighed before and after exposure, … Read more
Calculating the corrosion allowance involves considering factors that can affect the rate of corrosion and adding a margin of safety to the original thickness of the piping. The corrosion allowance is typically specified during the design phase of a piping system to ensure its longevity and safety. How you can calculate the corrosion allowance Understand … Read more
Erosion corrosion also known as flow-enhanced corrosion or impingement attack takes place in flowing systems where turbulence occurs and solid particles i.e. sand is associated, typically in pipe bends (elbows), flow constrictions, and other internals, pipe fittings that alter flow direction or velocity. The mechanism for this type of corrosion is the continual flow of … Read more
sweet and sour corrosion: Corrosion primarily caused by dissolved CO2 is commonly called sweet corrosion, whereas corrosion due to the combined presence of dissolved CO2 and H2S is referred to as sour corrosion. A rule-of-thumb distinction between the two is that sweet corrosion occurs where the partial pressure of CO2 is more than 500 times … Read more
Galvanic corrosion may occur when two different metallic materials are connected in corrosive service. The potential difference may cause an increased corrosion rate for the less noble material. If neither of the two materials corrodes by itself in a service, combination with the other will not normally cause corrosion in this service. In this aspect, … Read more
A Double Block & Bleed or DBB valve is defined as a valve isolation that consists of two valves in series with an intermediate venting facility. The vent allows personnel to monitor the performance of the primary isolation valve for integrity and prevent an increase of pressure at the secondary isolation valve. Dbb valve are … Read more
Pipe material selection: Basis for the pipe material selection is the conditions under which the materials shall operate. The following information is normally required to select the correct material: Fluid properties Operating temperature and pressure Design temperature and pressure Upset conditions Material properties (corrosion resistance and mechanical properties) Material limitations The basis for the material … Read more