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Hi Is it possible to used Sight glass in ATEX area (Zone 1 group 2)? Glass is sometimes not recommended in EX area. A low conudctivity fluid (lubricating oil) will flow through the sight glass. This oil may be charger by a fine filtration upstream filter. I would like to avoid potential static...

Hi Someone know why according to API 614 part 2 and 3 metal mesh is not acceptable for oil filtration ? 1.6.4.4 Metal mesh or stainless metal filter elements are not acceptable Regards

Hi Be careful, it is easy to overfill a run down tank as is is really difficult to size the rundown tank overflow line. In this line you have gravity flow (the line is probably not 100% filled with oil, so you have a mix between air and gas. This flow will be probably not stable if the oil...

The stone wall exact location in Compressor map is often unknow by Compressor manufacturers. Running on this location will generate low frequency vibration which may trip or potentialy damage your Compressor. These conditions are generally considered less critical then surge conditions.

Hi I currently design an expander with a tandem dry gas seal. On the primary vent line (connected to flare)a Pressure control valve set at 3 barg is installed. This valve allowed to have always a minimum differential pressure across segondary DGS (required by DGS manufacturer). However, before...

Hi Someone know the technical reason about the maximum 5 shims requirement number under machine foot (potential untightening screw problem ?)specified in API686). same question about the maximum shim thickness of 12 mm ? Regards

Yes it is standarde ASME B16.5 fLanges with the valve face to face dimension in line with B16.10

I will use ASTM A194 B8M material (stainless steel 316) The stud and bolt will have ISO threat. The pipe will be in cryogenic conditions and will never reach realy high temp (max 100 °C). Sometime with flange valve it is not possible to install Heavy hex, but only Hex (not enough space between...

Hi AMSE B16.5 recommend to use heavy hex. However it is only a reommmendation, is it possible to use hex (smaller nuts) and why ? What is the minimum nuts characterisics or size ?

In this configuration, the expander proces gas is natural gas @ 30 barg. The vents are piped to safe area and I'm not really concert about corrosion (tank 100% in stainless steel). My concern was more about potential DGS contamination by oil mist. Do you think that this is a real risk ? I can...

Thanks for your feedback. The machine is a exapnder - generator, the expander (on high pressure part) drive the generator (low pressure part) The gearbox (low presure part) reduce the spped between high and low speed shafts. The high speed shaft is equiped tandem dry gas seal(with intermediate...

hi there is recommendations on API 686.

Hi I have Turbo generator with tandem dry gas seal and carbon ring on gearbox side. I would like to know, how long the machine can remain running in case of separation gas loss ? My concern is about DGS potential contamination by oil mist. In order to avoid oil migration (on DGS) is it...

Thanks for your feedback Rotw

Hi Someone know if API 614 part 4 is applicable for labyrinth and carbon ring sealing or if it is only applicable for Dry gas seal ? Especially the requirements for seal gas and filter sizing. Regards Matchess

Hi all, I design a pressuriez oil system for an expander-compressors (acc. to API614 firth edition annex G & API617 Part4) The operating pressure of the oil tank is > 60 barg with flammable gas. The design pressure of the seal gas oil system and compressor/expander/bearing casing is > 90 barg...

Hi all, I design a pressuriez oil system for an expander-compressors (acc. to API614 firth edition annex G & API617 Part4) The operating pressure of the oil tank is > 60 barg with flammable gas. The design pressure of the seal gas oil system and compressor/expander/bearing casing is > 90 barg...

Good morning I am designing a lube oil system for a turbo expander This turbo expander is supplied with two oil pumps (1 for normal operation + 1 for back up) A check valve is placed dicharge line of each pump and I am asking if two PSV placed upstream of eash check valve are required to...

All righ Thank you Latexman

Thank you for your quick and interesting responses Latexman, I am not quite sure, I correctly understood your answer. In my case: The PSV and Rupture disk set pressure are the same (equal to 25 Barg) So, If I follow the guideline from your former company. The alarm set pressure will be 25...