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I am calculating and checking the piping loads at nozzles of a 2 stage compressor which may also operate in parallel. Compressor assembly drawing shows a Low pressure and High pressure side (each with an Inlet & an Outlet nozzle) on either side of the Motor. When checking the combined...

jte- you mean I won't find Fig. 5-110.2.2 in more recent editions of VIII Div 2? I only have the 2007 edition and just scanned through it and could not find these curves! btw, I do have an old copy of Fig. 5-110.1 (from VIII, Div 2) which is the design fatigue curve for CS, low alloy, ...,high...

I was trying to perfom a dynamic (harmonic analysis) on a piping system of SS austenitic type) material. In order to check my dynamic stresses, I was looking for the appropriate source of reference and the applicable S-N (stress range vs. no. of cycles) curve. So, I did some reading and I am a...

MJCronin Thanks a bunch. great site.

IFRs How exactly do you mean when saying: 1)"Tube seals test better in the lab..." 2)"Mechanical seals are less efficient in the lab..." Do you mind elaborating a bit on the above statements? What kind of tests do they perform on these 2 types of seals that render these results? If it is too...

NozzleTwister & JohnBreen First of all, I wanted to thank you guys for the informative replies you've posted. One question though; Don't they usually detach the piping from equipment (especially rotary types) nozzles and blind it before conducting steam out. This way, we won't have to worry...

BigInch If you already know this, then ignore this thread. However, if this tank was to be erected in a rainy climate we certainly would have to worry about rain. Floating roofs usually come with roof drainage systems which are gravity drained through hoses hanging off the roof deck and...

What are the pros and cons of using "Tube seal" vs. "Mechanical seal" or vice versa to seal off the gap between the roof and shell of an Atmospheric Storage Tank? I work on this project which involves erection of 500,000 BBL Atmospheric Storage Tanks for storing Heavy Crude Oil and the...

grampi1, By saying "Sour service is a higher risk for SW", Do you mean even if we NACE the pipe, SW pipe is still at risk with sour service? drno

BigInch, Thanks for the reply. The only disadvantages that came to my mind regarding Spiral Welded Pipes (hereinafter; SPW) were of practical importance. I think the only down side with using SPW's are difficulties arising during installation such as: 1- Trying to avoid the weld lines...

Are there any limitations in using spiral welded pipes for pipelines transporting crude oil(onshore & offshore)? If so according to what code or standard? I am actually worried about the conditions and stresses arising during installation of offshore pipelines. I have checked in ASME B31.4...

I thank you all for caring to reply and your helpful comments. very useful, indeed. drno

Gents, Suppose having Double walled Storage Tanks containing refrigerated Propane (-47°C) at Atmospheric Pressure. Nitrogen blanketing NOT an option. My question is regarding the thermodynamic behaviour of propane inside such tanks? Is this correct to assume that when the tank is partially...

Thank you all. MortenA, thanks for the tip. I tried $2/kg for steel. Does that sound reasonable? regards, drno

gents, I have been searching over the net for a site that quotes the prevailing unit rates for pipeline prices. I am not even sure if such site exists but I tried and came up empty handed. Any info is highly appreciated. I am preparing a preliminary cost estimate for a 400 km long, 30" dia...

Thanks BigInch. I feel a little more at ease now, because I had based our pipe size calcs on these numbers. Like you said, in my case we're offloading from the SPM/PLEM to the shore and I will certainly look into ESD cases downstream of the PLEM. We'll probably end up with a surge tank at the...

Can someone confirm or corrcet the numbers that I have for Offloading rate of VLCC type ships? According to my sources which are questionable, VLCC's pump heavy crude at 9000 cubic meters/hr at 12-15 barg. Does this sound right? Do different VLCC tankers have different pumping capacities...

Has anyone been involved with design and installation of pipes connecting to water turbines like the ones you have at the base of a dam? How exactly is the water carried from behind the dam to turbine inlet? Does it flow through a concrete tunnel, conduit or a large bore steel pipe? If it is...

Gents, Would you recommend using a Venturi type flow meter on a piping system carrying Gas? If so, what are the advantages and disadvantages? What if we are dealing with extremely high flow velocities in the pipe? Say 300 m/s. let's assume the venturi flanges to be 8". Would you still...

If I understood your question correctly, assuming the pipe is half filled, you're dealing with differential stresses between the top half and bottom half of your horizontal runs along the pipe due to the temperature gradient from top to bottom of the pipe cross section. Besides selecting the...