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Month: February 2017

How to Write Marketing Aspect of Feasibility Study

Rifka Aisyah Leave a comment

In previous post, I wrote about how to write technical aspect of feasibility study. In this post, I want to share you how to write marketing aspect of feasibility study. This topic is important to ensure that the proposed product has market/specific market and to determine how much the capacity of product to be produced.

When I involved in the project, which was reactivation of carboxymethyl cellulose (CMC) plant, I learnt that Indonesia mostly imported CMC from China. Local producers of CMC in Indonesia were only two, PT Humpuss Karboksimetil Selulosa (PT HKS) and the other one (I forgot). The fact that Indonesia imported CMC means there are demand that cannot be met be local supply. So, marketing aspect aspect of feasibility will be started from supply and demand. Read More

Technical Aspect of Feasibility Study based on My Actual Experience

Rifka Aisyah Leave a comment

There are at least two aspects that make a feasibility study sounds: technical aspect and financial aspect. In this post I want to share you the first one: how to make technical aspect of feasibility study.

I have involved in three feasibility study projects. Each project has different technical aspect that being focused. I want to be more practical in this post, so I will share you example of what to write for technical aspect of feasibility study based on my current project.  Read More

Pipe Wall Thickness Chart

Rifka Aisyah Leave a comment

Pipe wall thickness chart is a must-have item for me as process engineer. I usually use it when I have to size pipe, do hydraulic analysis, etc. Information I need from the chart are mostly outside diameter and inside diameter of particular pipe size.

In this post I want to share you pipe wall thickness chart based on ASME B36.19M-2004 Stainless Steel Pipe.

In this chart you can extract data of

  • Outside diameter and wall thickness in inch and mm
  • Pipe size is expressed in NPS (Nominal Pipe Schedule) and DN (Diametre Nominal)
  • Weight in pound per linear foot or kilogram per meter

Read More

PSV

Safety Valve vs Relief Valve (Differences based on API 521)

Rifka Aisyah 2 Comments

Sometimes terms can be confusing. Terms safety valve and relief valve are confusing too. So, to make it clear, let see the definition based on API 521.

Pressure relief valve is a generic term applied to relief valves, safety valves, and safety relief valves. It is designed to automatically reclose and prevent the flow of fluid.

Relief valve is a spring-loaded pressure relief valve actuated by the static pressure upstream of the valve. The valve opens normally in proportion to the pressure increase over the opening pressure. A relief valve is used primarily with incompressible fluids.

Safety relief valve is a spring-loaded pressure relief valve that may be used as either a safety or relief valve, depending on the application.

Safety valve is a spring-loaded pressure relief valve actuated by the static pressure upstream of the valve and characterized by rapid opening or pop action. A safety valve is normally used for compressible fluid.

Can you spot the differences?

Relief valve is used for liquid and open in proportion to the pressure increase, while safety valve is used for gas and open rapidly.

Reference:

API 521 Pressure relieving and depressuring system