Search results for query: *

Thanks dcasto. Yes, it's not that much. For the pipeline in question it's less than 1000 m3.

Any better ideas for getting pressure out of the line quickly and isolating the leak. In the event of a large leak I guess the block valves would be closed first and the leak itself would do the depressurising! For small leaks (e.g. drill holes), I'm not sure about the best approach. Thanks

Thanks BigInch, Yes, I had thought about elevation issues and there will be sections of the line that cannot be depressurised to atmospheric. This is something that cannot be avoided. The rapid depressurisation is to be carried out in the event of a leak (most likely caused by theft attempt)...

Hello all, I am dealing with a long distance, large diameter oil pipeline. It has two pump station (at the start and mid-point), and typical block valve stations along the route. What is the fastest way to depressurise the section between the start of the pipeline and the mid-point pump station...

Thanks LittleInch, that's very helpful advice. I should be able to come up with a workable solution now.

Thanks Little Inch, We have been able to scale back to smaller valves, but still quite large (10" - 24"). For the 24" valves we have the option of duplicating lines to further reduce diameter and minimise operating times (i.e. achieve the required flow using two smaller lines rather than a...

Thanks Dean, I need to purchase the valves and am really trying to determine the shortest time in which they could be operated. The valves will be used for switching streams on a multiproduct manifold, so fast operation in beneficial. Cheers Mark

Thank you for the reply gents. I will contact a valve vendor.

Thanks for the response guys. I have made an enquiry with a DRA vendor and will post any findings. Cheers

Hello, Does anyone know if the use of Drag Reducing Agent (DRA) in a multiproduct (diesel and gasoline) pipeline will have an impact on the amount of interface generated between dissimilar batches? Thanks

Hello, For a typical 32" quarter turn (ball or plug valve) with gearbox, does anyone have an approximation for the number of handwheel turns required to fully open or close? Thanks

Thanks for the help. Yes, I'm referring to the weld-end type anchor flange pictured by BigInch. I agree that the hoop stress design factor should be in accordance with the pipeline design factor. I'm interested to know about the design factor for axial and combined stresses. An anchor flange...

Hello, What design factor should be used for a pipeline anchor flange? Thanks

Hi, I recently requested a quote for a gas / water heat exchanger with a high pressure difference between the shell side and tube side. The design includes a rupture disc to protect the shell side from overpressure (designed in accordance with API 521). One vendor told me he will not provide a...

Thanks guys. It's a wet, sour gas, so internal corrosion in the big issue. CRA (clad / lined) is an obvious solution, but it's very expensive and the lead time for purchase (of a few miles) is more than 12 months at the moment. I was hoping for a short lead time alternative (and cheaper would be...

Thanks LittleInch and zd, some good advice there. After further investigation it looks like the normal poly solutions won't do the job. The lining idea is a possibility. I was aware of that option, but it's a little tricky because there are many closely spaced bends on this pipeline. So we would...

Hi, Is anyone aware of a poly pipe product that is suitable for approx. 26 barg design pressure in 24" (natural gas service)? It's off the charts for the usual products, but perhaps there is a more advanced product that I'm not aware of. Thanks

No problems BigInch, I wasn't aware of them until recently. I made a mistake - I meant Scotchkote 625-155, rather than 135. I will let you know if we go down that path. Hopefully we can avoid 140 deg C via upstream process adjustments. Cheers

Yes, we will have to do a detailed fatigue analysis. Thanks for the tips Dave. BigInch, there are some new Fusion Bonded Epoxy coating systems on the market that can withstand up to 150 deg C (eg. 3M Skotchkote 135). Rconner, I understand what you mean and it's something for us to consider...

I agree LittleInch, but unfortunately above ground is not an option for this line. Cheers