Recent content by larryli2004

Good comments, Racookpe1978. I am working with some companies to figure this out. Apparently it has been done before.

Agreed. keep thread connection and seal weld to cover all exposed threads is our primary option. Just want to check if machining was done before.

Hi, Does anyone have experience of machining a threadolet to a socketolet? It is an odd question. We have a threadolet welded to the pipe already. Want to see if it can be machined to a socketolet. Thanks.

I tried to post the curve, but it doesn't work. I will try again later. Anyway, really appreciate your reply. Thanks, LittleInch and Petrochemical87.

I saw a performance curve for liquid ring compressor per the following (Sorry, curve can't be shown; X- discharge pressure; Y- flowrate; RP - rated point; RP is located out of curve and under almost the right coner of the curve) , but I don't know how to understand the rated point is out of...

Thanks Morten. I see the prons and cons. I have seen a few plants with PSV vented to atmoshphere, I just personally haven't done any NGL project previously. What would be your best suggestion? We potentially have a few more bullets after expansion. Sizing for worse case and have all PSV...

I mean the PSV pop to atmosphere may make the things worse.

Yes, I checked NFPA-30 but I could find the direct answer. It is allowed per code. I am just not sure any additional requirements to be followed. When fire happens, vessel will collapse eventually but proper design may buy some time. If PSV is vented atmosphere, it may cause the second fire.

Thanks Chance17. Yes, we will contact local regulatory body and check any concerns they have. We have a flare stack on site for some thermal relief PSVs and manual blow down. Currently it is 50 m away from propane bullet. We don't have steam available at site. Our site is relatively small and if...

I have a few 2000 bbl propane bullet with a design pressure 250 psig. We have sized the PSV for fire case. My question is, can we relief all PSV to atmopshere? If we bring the PSV relief to flare system, the header will be very large. If we vent the relief to atmosphere, is there any code...

I am running into a probalem with triplex pump for condensate application. The gas stream contains 0.3% H2S. There will be some H2S entrained in condensate (won't be much). We just got a triplex pump. The material is ok for sour application but it doesn't come with leak detection system. We have...

Well, for high pressure vessel, it is normally not a problem because the wall thickness will be more than 38 mm anyway. Most time the argument is raise for low pressure vessel such as free water knockout (MAWP around 75-125 psig). Very often the wall thickness is around 1/2" for these vessels.

Jt, I agree the concentration will be reduced. But as per the quote I copied from ASME Section VIII, I think it does belongs to lethal service. "By “lethal substances” are meant poisonous gases or liquids of such a nature that a very small amount of the gas or of the vapor of the liquid mixed...

well, as per lethal service's definition, even 100 ppm H2S belongs to this category.

But I think it still depends on wall thickness. As per UCS-56, even for lethel service, the PWHT is not required for wall thickness less than 1/2".