A British Firm (GL Industrial Services UK Ltd.) was experimenting with composites to dampen the dynamic response of small bore connections to compressors with the handle "Constrained Layer Damping".
This investigation was completed in 2019, but the Final Summary Report is a little sparce on...
I would like to determine the effect on natural frequencies in bending by adding incremental layers of a composite wrap to the entire length of a stainless steel tube.
For this application, the tube is simply supported at one end and anchored at the other with uniformly distributed mass of just...
A 40ft x 32ft high diesel storage tank at my plant has provided excellent service since 1978 with some minor pitting on the underside of the floor plates, which have been patched.
Recently, localized thinning below 0.1" of the 0.25" outer annular ring (chine) adjacent to the 12" wide concrete...
I made an intriguing discovery while epoxying plastic knobs to neodymium magnets.
I didn't pay attention to polarity when epoxying them but discovered that, thankfully, all but 3 out of 16 were configured so that they repelled each other.
This was fortuitous because they are prone to spalling...
thread135-433434
At our plant we use a leak sealing agent comprising carbon fibers (.007 x .1) mm dia/length in DUR-O-SET A-802 emulsion for sealing minor leaks from pinholes (2 mm dia) in pipe. My question is: would aeration while diluting in water reduce the LDV (Lowest Deposition Velocity)...
thread408-405652
The damaged valve was disposed of before inspectors could characterize the failure mode.
Turning the handle raised the stem but UT indicated the gate did not move.
To fail the stem in torsion and compression, calculations indicate very low yoke sleeve/nut friction and very large...
A leaking control valve stem packing requires on-line sealant injection through the existing leak-off port at the lantern ring.
I calculated the maximum stuffing box pressure using thick shell formulae and area replacement methodology (for the injection hole) and got approx. 10,000 psig based on...
Engineering is proposing to install 4"nps tell-tale drains immediately downstream of 4"nps boiler blow-off valves on horizontal lines. The idea is to give operators 'handier' drains to monitor. This arrangement is probably going to produce flow disturbances from drain water entrainment...
I am looking for testimonials from test labs (or literature) on the frequency that Clause 19.3.4 acceptance criteria is involked for small diameter A312 TP304L pipe. This will help form a risk argument for the probability of cracks forming during an emergency crimp on a 3/4"nps sch40 pipe...
I am looking for an oil absorbent rope that can be compressed into a 2" tube, which would be inserted into a 24" dia by 18 foot long horizontal tank half filled with water that has a layer of oil on its surface. The only access to this tank is through a 2" dia nozzle.
30 pom-poms on a 50 foot...
The normally closed, 1500lb 10"nps wedge gate valve body/bonnet gasket is leaking 1200 psig and 500 degF subcooled water at about 1.5 lb/min.
The idea to plug this leak is to back seat the valve, hook a jacking pump to the packing blow-out line, close the valve and inject sealant. The...
The normally closed, 1500lb 10"nps wedge gate valve body/bonnet gasket is leaking 1200 psig and 500 degF subcooled water at about 1.5 lb/min. The idea to plug this leak is to back seat the valve, hook a jacking pump to the packing blow-out line, close the valve and inject sealant. The...
thread330-16741
I am looking for equipment and expertise to crimp a 3/4"nps sch80 A106B pipe pressurized with stagnant water at 1200 psig and 500 degF. It is an inter-gate pressure equalizing line on a closed gate valve that has a passing body/bonnet gasket joint. I have been advised that two...
I'm looking for empirical data on rupture pressure for malleable iron fittings manufactured to ASME B16.3 to provide a basis for a Safety Margin argument.
The only other data I have is five 1"nps threaded elbows that were all exposed to 2500 psig air and did not leak!
A flow induced vibration analysis of a steam surface condenser uses the following methods to determine the propensity to vibrate:
1) how close the tube structural frequencies lie to the vortex shedding frequency
2) the maximum tube vibration amplitude at resonance
3) Connor's fluid elastic...
The steam condenser in question is a vertical, four pass, U-tube design with a spray header. The ring steam header is mounted inside of the ring spray header above the centrally hung tube bundle. Both spray and surface condensing capacities are sized for maximum steam flow, they are supplied...
1978 TEMA C recommended that for 300 psig+ and 350 degF + heat exchangers with 5/8" dia and larger tubes you should either expand the tubes over 1-1/4" min. length in a two-grooved tubesheet or use full strength seal welds.
If the 5/8" dia tubes are presently rolled 3" long in a 6" thick...
If a liquid in a long pipe vaporizes along its entire length due to uniform heat input, may I take advantage of the 1/3 pressure drop factor to calculate peak pressure?
If the pipe is closed at one end and open at the other, then vapour bubbles will grow uniformly and displace liquid towards...
I am very interested in a failure mechanism that is associated with low and intermittent tube flow that causes tube failure and tube movement. This has been observed in verticaly oriented, u-tube heat exchangers and requires a hot shell (secondary) side, cold tube (primary) side, liquid medium...
