I have a current design requirement for a heave compensation system on a articulating boom crane. I have done a quick review of API 2C but do not have that "warm puppy feeling" on the detailed requirements on this type of crane (heave compensated).
I have seen other threads that relate to the...
Does anyone have a recommendation for a high pressure seal design reference?
The applications I have are all subsea wellhead type pressure levels between 10,000 and 15,000 PSI. I don't need any material that addresses refinery type technology.
I have all the API specifications, but I need some...
Need criteria for selection of piston length for an annular piston design. The ID is 10 inches and the maximum operating pressure is 7500 PSI. Plan on using PolyPac Seal system, but cannot find a reliable criteria for L/D ratio/piston anti-jam stability. Operation is subsea in 5000 to 10000 feet...
Thank you all for the feedback.
For this application, the bore has no rifling.
The obturator's main function is to protect some additional non-metallic seals from the propellant gases. The obturator has no alignment function and the generation of spin is of no concern.
This is definitely a...
thread1-175890
Following this thread provides some links, but I need some information of the design of ballistic seals. I have a hybrid design application which combines a "high-low" system similar to a pilot's ejection system with a hydraulic subsystem. It looks like conventional projectiles...
Thanks for the reply.
We are fairly certain we will have to design our own configuration. A commercial search has come back empty handed.
The fluid is a common blend that is used for subsea piping valves.
Our application has a back pressure minimum of 2500 PSI and a high side pressure from...
I have an application that requires operation of spool power valves subsea with flow rates exceeding 250 GPM for response times on the order of 450 milliseconds using a working fluid with a specific gravity of 1.06. The limit of 15 FPS is obviously far too conservative for these transients. Any...
There seems to be several criteria for "hot spot stress". During linear finite element analyses, small areas often appear which can be defined as "hot spot stress" and are excluded from limit state stress levels for design. One definition from a colleague from the American Bureau of Shipping...
Thanks kiwi2671. I would have NEVER spotted that note.
I checked in AWS D1.1/D1.1M:2010 which has some additional "Shalls"
Page 77 Note g: For both static and cyclic loading the fillet must be a minimum of T1/4 but not exceed 3/8 inch.
T1 is the part of the tee joint forming the stem of the...
I don't have acess to D1.1 right now, but the AISC guidelines call for a minimum 1/4 inch fillet reinforcement for a CJP groove weld for a tee joint. My present research seems to show that this reinforcement is strictly a fatigue treatment. I have data for fillet reinforcement of partial...
The use of composite bearings for this application is usually not appropriate. I have tried them in the past with dissapointing results. I have used DX bearings for an offshore servo system design and the bearings failed after just a few cycles. I trust grease, bronze, inches and pounds (KIPS).
My current application is for a large crane with 8 to 12 inch pin size and bearing loads on the order of 800 KIPS.
I am currently using an allowable stress range of ~16 KSI for the bearing material. What would be the best bearing material with only grease lubrication and rotation limited to < 90...
I need a definitive answer (non civil plaster/dirt engineering) to which applicable codes to use for catwalk allowable deflection for refinery operations. I have reviewed ABS, DNV and other guidelines and recall somewhere seeing L/300. I am strictly interested in steel catwalks only.
