Hi guys. I should know the answer to this, but... Do you know if AWWA C200 pipe is dimensionally the same as ASME B36.10 pipe? As best I can tell, C200 does not explicitly say.
C200 incorporates API 5L by reference, but it does not say that dimensions shall comply with 5L, unless I have...
Thanks for your reply. Link: https://cemerynelson.com/product/duroflow-3004-positive-displacement-blower-vacuum-pump/
The exact model is GGBADBA.
Unfortunately, I do not have a datasheet. Wouldn't that be nice? The originals are long gone, so I would have to create new from scratch. I'll...
Hi guys. Not sure this is the right forum, so please recommend an alternate if I need to move this post. I have two PD lobe blowers (Gardner-Denver GGB type, 15 hp each) that my client is proposing to put in series to meet a ~30 psig discharge pressure requirement. These are surplus equipment...
The problem is we have allowables published by the pump manufacturers. If there is a failure and subsequent court action and the failure can be shown to have been caused by the flexibility model not having followed a published allowable, you will be hung out to dry for the buzzards.
In my...
Don't use API 610 allowable flange loads unless the pumps are API 610 (the post doesn't say what they are). API 610 loads are really high and non-API pumps won't withstand those.
Your pump manufacturer should have published allowables. Contact the manufacturer or their rep and ask for those...
Thanks. Perhaps you could share which forum is correct? I do not see one specifically for gas turbines or for cogeneration plants.
I searched on the term 'gas turbine' and received a bunch of hits across many different forums. Since this engine is installed in a cogeneration plant, I felt...
Hi guys. Wondering what product you all are using for replacement coating for a gas turbine clean room (the space between the inlet air filtration and the turbine air inlet). This is for replacement of the existing damaged/worn out coating. This would be applied in situ. Thanks! Pete
Just a couple points. First I assume B31.1 is the correct code for your application (on-skid boiler piping, or steam piping)?
Second, remember that span between supports is controlled by allowable stress, and allowable stress is determined by the equations particular to the governing B31...
Thanks LI. N2 would be fine. To retrofit with that type of dampener now would be a significant expense (cost of dampeners plus piping changes) because the existing dampeners are the bladder-less type. I would need to make the case that those would be more effective than what is existing...
There's No reference per se that I've ever seen. Most people use horse sense and past experience. The code permits that approach as long as the piping is laid out by a competent designer (the code defines exactly what that means) and the layout can be shown to be adequate by virtue of existing...
Modeling this in CAESAR would give you a defensible estimate but it will be far from an accurate answer. The load calculated by CAESAR will be the reaction needed at the nipple-to-flange node to create a stress level equal to the max allowable developed in the pipe for whatever load case you...
Thanks Andrew. I appreciate the great information. Unfortunately, since this is boiler feedwater I have to keep out oxygen so that precludes the use of air-filled / no bladder. Thanks! Pete
Yes - this is the first (most conservative) assumption and is always tried as the first cut.
Correct. But there are ways to get reasonable approximations that are defensible. FEA is one way. Judgment-based SWAG is another. If the system does not pass allowable flange loads, and if you are...
Uhhh.... all I can say is you've had the C team on your projects. There is zero requirement for an anchor to be in any line in any stress analysis software. The line just has to be properly supported. Also, if he used a full anchor, there's one more point of evidence you had the C team...
OK. When I say 'Stiffness' I'm referring to the classical Hookean definition of stiffness, that being the k in Hooke's Law: force (or stress) = stiffness * deflection. Stiffness is also known as flexiblity.
In our case here, stiffness in a pipe stress model is a representation of how flexible...
1503 - I gently submit you misread my post. Having done this for nearly 40 years now I know from where I speak and I got the bruises to show for it. My procedure above works every time. Please explain how you concluded that my procedure will end up in 'warped flanges'.
There are PLENTY of...
Yes. 140° F pipe surface temperature is based on actual measurements during early afternoon of a summer day with ambient at around 105° F in this local area (central Calif.). Solar radiation is a function of latitude, so I would suggest using a black HDPE surface as a test, measure the...
Best to contact the manufacturer and ask them. Don't make any assumptions.
Also - Make sure you include some kind of stiffness in the model for the flexibility of the flanges. Model the flanges as a flex anchor. The flanges are not infinitely stiff, which is the CAESAR default assumption...
Watch out for temperature. The line will heat up fast where it is exposed to sun. The pressure rating of HDPE drops fast with temperature. We use 140° F for HDPE pipe exposed to sun for design temperature. Check the derating curve for your pipe and make sure you don't go over the MAWP at...
