It depends on the make/model of smart pig. Traditionally smart pigs are much longer than regular cleaning pigs, but advances have been made for certain types to shorten them overall in length.
Correct, however these published m & y values for Grooved Metal gaskets in VIII-1 do not apply to Kammpro gaskets (aka Grooved Metal w/Soft Facing or Grooved Metal Graphite Covered [GMGC]). VIII-1 has neglected this issue for decades years now, despite adding more & more pages to the clunky...
Going with a kammpro gasket with lower m & y values under VIII-1, MA-2 will result on a smaller & lower cost bolted head flange design. Since VIII-1, MA-2, in their infinite wisdom, has yet to adopt standard m & y values for kammpro gaskets, you can use the published m & y values provided by...
The big problem with spiral-wounds is you'll need a inner ring to prevent the windings from buckling. The outer ring on spiral-wounds also prevents winding buckling, but this is typically not need if your exchanger flanges are a confined type, which serves the same purpose for a spiral-wound...
Agreed. The modern VIII-1 code has devolved into something more akin to the IRS tax code written by lawyers instead of a true engineering code. VIII-1 should be overhauled entirely in my humble opinion. Would take an act of congress though.
There wouldn't really be any downside to taper boring the 6" side (per code requirements, typically max 3:1 taper), other than the additional time & work involved in that. This is done often when buttweld fittings are ordered with thicker wall than the component they're being buttwelded to
@r6155
It's well understood that when you "plug" a repad vent hole/TTH with stiff grease that you're not actually plugging it to retain pressure. The reason you plug/fill the repad vent hole with stiff grease after fabrication is to prevent moisture ingress & local corrosion of the vent hole...
Forgot to mention, the reason for this vent hole in repad (in case it isn't clear) is to allow any welding vapors for the repad to vent out & not become trapped within the shell/nozzle area enclosed by the repad
The breathing/vent hole in repad is typically tapped with threads to do a 15 psig air test on the repad weld. Just plug the tapped vent hole with stiff grease (after painting, if req'd).
You need to specify the pipe schedule bore when ordering socket weld flanges, similar (but not exactly the same) to weld neck flanges. Otherwise you'll like end up with mismatched bores/IDs btw flange & pipe. Typically socket weld flanges are used in small bore applications (<2" size). Small...
When specifying tube-to-tubesheet strength welds, I've typically gone with & seen the Fig UW-20.1(b) joint design the most. But it can depend on you're design conditions. This is a groove weld with the tubesheet holes beveled. The size of your groove weld legs is determined under UW-20.6...
Typically you're design conditions on heater tubes are fairly low pressure, high temperature. Performing a hydrotest to API530 (1.5 x DP x Stress Ratio) is usually pretty feasible, unless your coils have older/existing plug header returns (instead of typical 180deg return bend fittings). The...
Ah, welcome to Pandora's Box....When you ask about Belzona, you must be specific on which Belzona product. There are dozens of types. Typically, when people say "Belzona", they're referring to an epoxy type coating (typically internal coating) used for corrosion protection. However, Belzona...
Just use a LWN nozzle (self reinforced). Never seen a vessel nozzle gusseted before. As GD2 stated, you typically only see gusset braces on small bore piping branches (under B31.3), and often it's designed & installed poorly.
Nozzle repads at high design temps also have drawbacks with...
Curious forum's opinions or experiences on this...I work at a refinery with an HF Alky unit. We've had many HF acid leaks in past with valve bolted bonnets, particularly with small bore gate valves. I would like to change to welded bonnet (threaded & seal-welded) style small bore gate valves...
