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Pipe Size Selection and Several Criteria of Pipe Size

Someone in my office asked me if there is a criteria for pipe size selection, in other words, pipe sizing criteria. One basic document that every process engineer produce in the beginning of engineering stage is process design basisIn the document, pipe size criteria shall be stated clearly.

I have involved in at least two engineering projects. Those two projects have different pipe size criteria. Which one is correct? Read More

Job Description of Project Engineer – My Real Experience (Part 1)

When I was working in this company, I worked as project engineer for precommissioning activity. In the end I realized that the term precomissioning department was not suitable for us, but mechanical completion.

I want to share you some experience and what I actually did as project engineer in that project. For your information, the project was Senoro Gas Development Project. It is owned by Joint Operating Body of Pertamina & Medco EP. It is located at Senoro, Central Sulawesi.

The History Begin With… Read More

How To Choose LNG Regasification System – AAV, ORV, IFV, and Other Unique Vaporizing Unit

Until now, I’m still dealing with LNG regasification system. I knew now that I don’t quite understand how to choose regasification method. And I understand that technology is getting better, so you have many options which type of regasification to choose, which one is the best.

I’ve studied several type of vaporizers, such as ambient air vaporizer, both natural draft and forced draft, open rack vaporizer, and intermediate fluid vaporizer, using glycol-water or propane. I had a correspondence with several vendors regarding that vaporizers. However, I haven’t encountered with submerged combustion vaporizer or intermediate fluid vaporizer with Rankine cycle. So, I can’t imagine how those vaporizers really work.

In the past, I remembered I encountered with Indirect Fired Water Bath Heater (personally, this term is really long, I can’t easily remember :D). But the application is not to regasify LNG, but to increase temperature of natural gas. In other word, it is gas post treatment after leaving vaporizer.

In this post, I want to share you summary of everything I learned until now about how to choose correct vaporizer for your condition. And I also want to share you some type of unique vaporizers (for me it is unique). Read More


How to Properly Size Discharge Pressure of Pump

When sizing discharge pressure of pump, we need to consider at least two things: target pressure at destination point and pressure loss from source point to destination point. How if we have two different destination points? How do we properly size pump discharge pressure?

In this post I want to share you simple method to size discharge pressure of pump when you have more than one destination point. Read More

Rollover in LNG Storage Tank

Rollover in LNG Storage Tank

I think reading BS EN 1160 makes my writing ideas grows. As a follow of of this post (LNG Basics: Understanding Its Typical Properties), I want to share you what I read and browsed about Rollover in LNG Storage Tank.

Rollover in one of physical phenomena explained in BS EN 1160, other than Rapid Phase Transition (RPT) and Boiling Liquid Expanding Vapor Explosion (BLEVE).

Rollover refer to process whereby large quantities of gas can be emitted from an LNG storage tank over a short period of time. How this could happen? Read More

Nitrogen vaporizing package

Nitrogen Gas Supply System

It is quite some time I don’t write about utility system. In this post I want to share you some basic knowledge of nitrogen supply system. In December 2015, I prepared several training presentation about nitrogen supply system when I was working in this company. I think it is a good idea to share some of them.

Nitrogen is used for purging activity and blanketing due to its unreacted feature.

Nitrogen is used at different application, depend on its application.

Required nitrogen purity based on its application

Required nitrogen purity based on its application

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Difference between Base Load, Peak Load, and Load Following Power Plant

Yesterday I had a discussion about our current project. The discussion was actually not only limited to that topic, however a topic in general: power plant. When one has plan to build a power plant, he must know operational profile of the power plant. Is it used for base load, peak load, or follower load ? What does it mean?

In this picture I show you the difference between those three. Read More

calculation holding time of LNG in storage tank

Predicting Holding Time of LNG in Storage Tank Without Venting

In this post, we use vacuum insulated type LNG storage tank when we don’t want to deal with boil-off gas handling. The storage tank have design pressure as high as 6-10 barg. When we store LNG in the LNG, boil-off gas will be generated due to heat leak to tank. Increasing temperature of LNG will increase total volume of LNG and vapor in the tank, thus increasing its pressure.

This phenomena leads to a simple question, “How long can LNG storage tank keep the vapor before PSV works?” Read More

LNG Basics: Understanding Its Typical Properties

For those who starts working with LNG, I recommend to read BS EN 1160 – Installations and equipment for liquefied natural gas – general characteristics of liquefied natural gas. The standard covers almost all LNG characteristics that you need to know, such as properties of LNG, evaporation of LNG, spillage, ignition, containment, and other physical phenomena. I think it will be nice to share some of them in this post.

There are three things at least you need to know about LNG before knowing other things.


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Understanding Flammability Limit and Explosive Limit

Have you heard about Flammability Limit and Explosive Limit? What does it mean? What the difference? These day I kept wondering if flammability limit and explosive limit is the same? Since I have to check vent stack data sheet from our mechanical engineer, I need to put low flammability limit criteria. What is that?

Explosion occur when three conditions are met:

  • Fuel
  • Oxygen (air)
  • Ignition source (spark or flame)

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