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Pneumatic Control and Electric Control Comparison

As you may already know, control is one of the most important part in plant. To ensure that every operating condition is controllable, we install many control valves that connected to a kind of process parameters, such as pressure, temperature, level, or phase interface. Control of parameter can be done by pneumatic control or electric control.

The availability of pneumatic control has declined, except in one area: gas pipeline industry. The main reason is pressurized gas is available to run the controller. It is essentially free and it does not introduce any additional hazard. Read More

Design of Shell and Tube Heat Exchanger – Tube Side Construction

In my previous post, design of shell and tube heat exchanger – layout design, I shared how to select fluid allocation, which one should be in tube side and which one should be shell side, general rule for allowable fluid velocity, pressure drop, and temperature approach. This post will be the continuation of design of shell and tube heat exchanger series, which specifically explain about construction detail in tube side.

Want to learn from the beginning?
Read my first post about step-by-step design of shell and tube heat exchanger. Still curious? Read my second about about layout design of shell and tube heat exchanger.

 

This is mind map of this topic.

Design of shell and tube heat exchanger - tube design
Design of shell and tube heat exchanger – tube design

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My First Javascript Online Calculator – Instrument Air and Compressor Sizing

For a long time, I want to post something more advance in this blog. I always want this blog like engineeringtoolbox.com or checalc.com. I want to make online calculator just like checalc.com did.

Due to my limitations, at this point I cannot create online calculator. To compensate that, I tried to make useful spreadsheet.

But, today I did it! I made my first online calculator, which is instrument air sizing calculator. Please click this link to access to instrument air and air compressor online calculator. I hope you find it useful.

It is better for you to check two of previous post related with the calculator. Calculation basis used in this calculator is based on those two post.

Read Sizing of Compressor and Instrument Air Capacity

Read Spreadsheet of Air Compressor and Air Dryer Calculation

BONUS!

I already replaced spreadsheet attached in this post : Spreadsheet of Air Compressor and Air Dryer Calculation. So you can trace how the calculation works.

 

Fire Water Pump Capacity Calculation Part 1 – Fire Zones Determination

Process safety and pressure relieving and depressuring system are two areas that I want to master. Since the topic is quite big, in this post I want to share you what I learnt about fire water pump capacity calculation, specifically how to determine fire zones.

Fire water pump capacity calculation begins with fire zones determination. The whole pictures of fire water pump capacity calculation is expressed in figure below.

Fire water pump capacity calculation
Fire water pump capacity calculation

To determine fire water pump capacity, we can say we determine fire water demandMaximum fire water demand is summation of fire water required for fixed system (water spray, foam, sprinkler) and fire water required for manual fire fighting equipment (fire hydrant, fire monitor, and hose reel). Read More

Design of Shell and Tube Heat Exchanger

It’s been quite a long time since the last time I saw and designed shell and tube heat exchanger. Recently, I got opportunity to dig and refresh knowledge that type of heat exchanger. In this post, I want to share you about design of shell and tube heat exchanger.

This figure shows you general step-by-step method of design of shell and tube heat exchanger.

Design of shell and tube heat exchanger
Design of shell and tube heat exchanger

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Application Range of Variety of Compressors and Compressor Selection

When I was involved in pre-FEED of well production and gas treatment, one of key deliverable is compressor studyIn this post, I want to share you about application range of variety of compressors (reciprocating, compressor, and axial-flow). In addition, I will also share the differences between those compressors.

Application Range of Variety of Compressors

Figure below can estimate application range of variety of compressors. It is a function of inlet flow in actual cubic feet per minute and discharge pressure in psia. 

Application range of variety of compressors
Application range of variety of compressors (source: Rules of Thumb of Chemical Engineers, Branan)

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Quantitative Risk Analysis Techniques Part 3 – Risk Results and Risk Mitigation

In the first part of quantitative risk analysis techniques, we learnt about crucial step of the analysis which are hazard identification and cause and frequency analysis. In second part, we learnt continuation of the first part, which are fault tree analysis or event tree analysis as an approach to estimate frequency. After that we learnt about consequence modeling and several potential consequences.

In this post we will learn about risk results and risk reduction and mitigation.

Risk Results

There are two graphic forms that are usually used to present risk result: individual risk contours and societal risk F-N curves (Frequency-Number of fatalities).

Individual risk is the risk to a person in the vicinity of a hazard. This includes nature of the injury to the individual, likelihood of injury occurring, and time period of injury occur.

Societal risk is a measure of risk to a group of people. It is mostly expressed as frequency distribution of multiple casualty events. Read More

I Participated in Lokakarya Sertifikasi Insinyur Profesional LSIP

Yesterday I participated in “Lokakarya Sertifikasi Insinyur Profesional LSIP” or Professional Engineers Certification Workshop held by “Persatuan Insinyur Indonesia” (Indonesian Engineers Association) in Jakarta. It was very awesome experience and I will tell you why.

At the beginning my motivation behind participating in this workshop was simply to get certified as professional engineer. Maybe if I get certificate, it will add value to myself. After I participated the workshop, being professional engineer is more than that. Being professional means to always work safely, to continuously improve oneself, and to contribute to the society. I am sure there are more than that, but those three points are what I remembered.

What did I get in Lokakarya Sertifikasi Insinyur Profesional LSIP?

In this lokakarya I got explanation about:

  • Indonesian Law no 11/2014 about engineering
  • Organization structure of Persatuan Insinyur Indonesia (Indonesian Engineers Association)
  • Engineer ethics code
  • Professional engineer application form – how to fill the application

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Quantitative Risk Analysis Techniques Part 2

In previous post, quantitative risk analysis techniques is started with hazard identification then frequency analysis. Frequency itself can be estimated by two approaches, which are generic data approach and modeling approach. The first approach is already described in previous post.

Modeling approach is used to estimate leak frequency when general statistics data is not available. Modeling approach use fault tree analysis or event tree analysis

Fault Tree Analysis (FTA)

Fault Tree Analysis provide estimated frequency/likelihood of even for events that have never occurred by combining all possible basic failure mode (collision, dropped object, human error). These modes are combined and we tract how these initiating events can propagate to the top event by progressive failures of safeguard or by combining with other events. We use AND or OR gate. Read More