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Fail-safe position

Fail-Safe Position Selection of Control Valve

In designing a processing facility, we usually use control valve to manipulates the temperature, pressure, level, or fluid flow rate in process system. The selection of control valve, which is air-to-open or air-to-close, is base on safety consideration. In case of power loss or air failure , control valve should move in safe position (fail-safe).

Fail Position

Fail position is the term used to describe how control valve will react when there is loss of power. I read there are three different fail positions. (more…)

How to Calculate Jockey Pump Capacity in Fire Fighting System

Main_fire_pumps_with_Jockey
http://en.wikipedia.org/wiki/Fire_pump

About two days ago, my colleague asked me about inconsistency in our design basis of fire fighting system of our on-going project. In our design basis, we stated that the capacity of jockey pump is 50 gpm (the capacity of main fire pump is 500 gpm for electric motor fire fighting and diesel engine fire fighting, respectively). But vendor who supply fire fighting package stated that they will supply jockey pump with the capacity of 25 gpm. It would be a problem if the Construction Management (the one who monitors and review the product of the project) notices this. The question that will be come up is are you sure the capacity of jockey pump (which is 25 gpm) is enough in case there is a fire? The question rises in my mind is

How to calculate jockey pump capacity in fire fighting system? (more…)

Project Implementation Scheduling

About a week ago, I got a copy of Project Implementation Scheduling and Project Engineering from my boss. Since I thought this copy might be very important, I decided to learn and write that on this blog.

Before we learn how to make implementation schedule, we’d better understand the scope of project implementation. The project implementation phase embraces the period from start of commercial production. It includes a number of stages, including negotiation and contracting, project design, construction and start-up. If not planned properly, this phase may extend over enough time to endanger the potential profitability of the project. Implementation scheduling is primarily aimed to determine the financial implications of the implementation phase with a view to securing sufficient finance to float the project until and beyond the start of production. (more…)

Plant Layout Consideration

About a week ago my boss asked me something crucial about Plant Conceptual Design and Layout for our bankable feasibility study of ferronickel project. He asked me if I had explained why we chose this part as smelter plant and not on that part, why the gate should be on the west side of the processing plant, and so on. I just shook my head and grinning. BIG NO! 

My boss was emphasizing the philosophy to make site plan. There are several considerations to make site plan. For example, the processing facilities which are heavy, require high load, and very dynamic, should be positioned at the relatively flat and so on.

I started to think what aspects we need to consider making plant layout. (more…)