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Submerged Turret Loading Buoy

LNG Regasification Vessel Requirement based on DNV Classification Notes No. 16.3

In previous posts, I shared some of onshore LNG terminal and regasification system. How about offshore LNG regasification system? Does it have any differences with onshore regasification system? In this post, I want to share you practical guidance of offshore regasification vessel from DNV (Det Norske Veritas) Classification Notes No. 16.3. DNV Classification Notes No. 16.3 is applicable for all vessels engages in LNG regasification.

Regasification vessel is intended to regasify LNG then delivered the gas to pipeline gas grid, through a Submerged Turret Buoy or through dedicated export manifold. The Classification Notes specifically explains regasification systems and offloading systems for natural gas through submerged turret buoy offshore or through dedicated gas unloading manifolds. (more…)

Cargo Emergency Shut Down System in Liquefied Gas Carrier

I am interested in designing ship-to-shore link and ESD arrangement in LNG vessel. I have involved in about three LNG projects, but I did not design or paid more attention in this field (because all the projects were front-end engineering design). In this post, I want to share you practical information about ESD arrangement as suggested by SIGTTO (Society of International Gas Tanker and Terminal Operators).

Function of Emergency Shut Down System

Function of cargo ESD system is to stop cargo liquid and vapor flow in the event of emergency and to bring the cargo handling system to safe condition. (more…)

Little bets

Book Review: Little Bets, How Breakthrough Ideas Emerge from Small Discoveries

Weekend is almost over. So let’s begin new week with new insight. Instead of sharing chemical engineering things which may be quite serious, in this post I want to share you a book I read. The title is Little Bets – How Breakthrough Ideas Emerge from Small Discoveries by Peter Sims.

I just read second chapter of the book of ten chapters. So I am quite slow at reading. That is because content in second chapter is really amazing. I highlighted most of the chapter and I internalized the chapter. Problem I always face after reading good book is I forget the content or I don’t know how to behave better based on the book. So, here I write it so it will lessen my forgetfulness.

Title about second chapter is The Growth of Mind-SetI kept repeating word “growth”, “grow”, “growing” to myself and I visualized is as growing small tree. This chapter is really important for me. (more…)

Methane number empirical models

Understanding Methane Number

In my previous LNG project, we need to supply gas with specified minimum methane number and specified higher heating value.

What is methane number?

It is the measure of resistance of fuel gases to engine knock, known as detonation. Detonation is produced by the auto-ignition of fuel/air mixture ahead of the propagating flame. Detonation must be immediately stopped to avoid increase of wear and tear and engine damage.

If MN is too low, the detonation can reduce engine efficiency and increases the quantity of harmful engine emissions.

MN Calculation

I searched if there is formula for the calculation, but I cannot find it. MN is not gas thermodynamic property, so no equation of state can be used to calculate it. I found there are several online methane number calculators. I tested three of them, Cummin, Wartsilla, and DNV MN calculator, respectively by using LNG Tangguh composition. These are the results.

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Natural Gas Quality Designation Parameters

When I was working on my second EPC project in Senoro, which was gas processing facility, I read that there are several natural gas quality that shall be complied. In the project, we also had to guarantee that the facilities can process gas from wells so that it met requirement as stated in contract. In this post, I want to share you the quality designation parameters for natural gas. To understand more about this area, please check ISO 13686: Natural Gas – Quality Designation.

Natural gas quality designation parameter
Natural gas quality designation parameter

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