Recent content by marvalar

Hi dcasto and thank you for your answer I'm quite aware of that practice in onshore installations, my doubt is if we can do it and how do we do it offshore. Thanks

Greetings, Onshore, it is a common practice to have an non permanent external source of nitrogen (HP cilynders or liquid vaporization) for exceptional high and infrequent consumptions - such as plant turnaround. Is it possible to have a similar philosophy offshore? How does it works? Thank you

HI EGT01, The only problem that I see is that, the API definition for "corrected" test pressure is: Phydro * Stest/Sdesign And not: Phydro * Sdesign/Stest So, to summarize. If we don't want to be in trouble, we should keep the operating pressure bellow 1.3xPdesign. This works as...

Hi Don and thank you for your reply. The corrected hydrotest gauge pressure is always at ambient temperature. This is independent of the design temperature. The uncorrected hydrotest gauge pressure will always be lower than the corrected one, except if the allowable stress at the design...

Help...

First you must calculate the superimposed back-pressure. On this case, the super-imposed back pressure will be the shut-off pressure of the LP pump. Then you must sum the built-up back-pressure. The built-up back pressure is the pressure drop developed on the outlet piping at relieving...

Hi all, I just came across section 4.3.2 - Closed outlet on vessels, of API RP521 - 5th edition. I'm a little bit confused. First it is stated: "If the pressure resulting from the failure of administrative controls can exceed the corrected hydrotest pressure, reliance on administrative...

You got it absolutely right. Thanks a lot. I've got vendor balances for 100%, 75%, 50% and 25% load. And yes, the bleed pressure decreases when the load decreases. Pre-heater sizing is on my side and I'm sizing it for the 100% load case. I feel that I must give some feedback to the vendor...

Greetings! I have a question regarding steam turbine bleed pressure. I'm studing a condensation turbine with 2 bleeds. The Bleed 1 feeds the deaerator, while bleed 2 feeds the LP Preheater. On the turbine vendor balance sheet I have for the bleed 2, let's say: 1.0 bara and 2000 kg/h. Now. I...

That's it. We also have a stripper prior to the steam generators. My goal is to minimize the blow down from the generators.

First of all let me apologize for the delayed answer. This is a rather strange steam cycle, I believe. The process steam is mixed with naphtha and heated in cracking furnaces. The cracking furnaces effluent is then cooled by direct contact with water in a quench tower. In this quench tower...

Thanks a lot. This steam is generated at 9 bar in a kettle hx by condensation of 14 bar steam. Nowadays we control pH, conductivity, iron and oils & fat. I remember that this is steam to mix with hydrocarbons.

Hello. This is my first post here. Anyone familiar with steam crackers know that hidrocarbon feeds are diluted in steam prior to the cracking. My question is. Where can I find some guidelines to control the quality of the water that is purged in the dilution steam boilers? Thanks a lot!