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City gas network

City Gas Distribution Network (Part 1)

Rifka Aisyah Leave a comment

This is second post of city gas network series. For the first post, please check “City Gas Flowrate Requirement”.

City gas distribution is one of Indonesia national priority program which purpose is to diversify energy, to reduce energy subsidiary, to provide clean and cheap energy, and as complementary program to convert cerosene into Liquified Petroleum Gas (LPG).

The total installed city gas until now is 56,888 house connection. It will be increased year by year. For example in 2013, the government planned to installed 16,000 connection. Read More

Economic of comparison vacuum insulated tank and flat bottom tank

Comparison of LNG Flat Bottom Tank and Vacuum Insulated Tank

Rifka Aisyah Leave a comment

In previous post (typical process flow diagram of small scale LNG regasification facility), I explained that LNG storage tank played important part in the facility. It is used to stored LNG for certain duration (usually in term of round trip). In small scale LNG regasification facilities, vacuum insulated tank is usually used because the capacity if small. But when the capacity is high, LNG flat bottom tank is used.

In this post I want to share you difference and comparison between LNG flat bottom tank and vacuum insulated tank and give some advice what to choose.

Table below shows comparison of flat bottom storage tank and vacuum insulated tank. Read More

Schematic of LNG single containment flat bottom tank part 2 (EN 1473)

Flat Bottom Storage Tank – Different Types and Its Features

Rifka Aisyah 1 Comment

In my third LNG project, I had a chance to meet two different LNG storage tank vendors. One vendor produce vacuum insulated  storage tank (pressurized type) and the other one produce flat bottom storage tank (atmospheric type).

During the meeting I got several terms of  LNG flat bottom storage tank types, such as single containment tank, double containment tank, and full containment tank. What was that?

In this post I want to share you different types of LNG flat bottom storage tank and its special features. Read More

self-confidence

Ten Tips How to Survive Working at Consultant Company

Rifka Aisyah Leave a comment

I’ve been working in two different consultant companies. Totally I’ve been working for almost four years in consultation world. In this post I want to share you some advice on how to survive working at consultant company. The inspiration of this post was from many difficulties I’ve faced.

#1 Working Experiences

The term consultant itself defines everything. When you work at consultant company, so you are “consultant”. You are the place where your client ask about their difficulties. You are also a right place to judge something. It is impossible to do that correctly if you are lack of experience. That is why consultant companies must be reinforced with well-experienced personnel, probably the one with more than ten years working experience in special fields (for example in LNG field, geothermal field, and so on). How if you are fresh graduate or the one with lack experience? I think you should learn from experience ones. It will be better for consultant company to invest in experienced personnel. Read More

Job Description of Project Engineer – My Real Experience (Part 2)

Rifka Aisyah Leave a comment

Please check first part of this post to explore my experience as project engineer 😉

I remembered the night when me and my colleagues went to Senoro 5 to show mechanical completion dossiers to our project manager. We brought three dossiers to show him the example. We thought he will be a little happy to check the dossiers and conclude that we are close to ready for gas in. Unfortunately, he didn’t.

At that time, I realized something more important that dossiers. He wanted to see by his own eyes that we’re ready. And dossiers didn’t convince him.

Fortunately, in the end we managed to get all aspects ready for gas in. Read More

Pipe Size Selection and Several Criteria of Pipe Size

Rifka Aisyah Leave a comment

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 basis. In 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)

Rifka Aisyah 1 Comment

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

Rifka Aisyah Leave a comment

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

illustration-for-pressure-loss-calculation

How to Properly Size Discharge Pressure of Pump

Rifka Aisyah 1 Comment

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