Bottom drain line limit space
Bottom drain line limit space
(OP)
Guys,
I have a problem with my rich glycol exchanger drain line. I have this vessel already stand above platform, and the space length from bottom flange (for drain) to floor is only 49mm. My piping engineer suggested to configure the bottom drain to be:
1. SS Blind ½ 150# with drill hole ½ FNPT
2. Male connector ½” OD x 1/2” NPT ,double ferrule,316 SS
3. Tubing ½” OD x 0.049” WT tubing seamless,fully annealed 316 SS, ASTM A269
4. Valve ½” OD,Ball , Double ferrule,316SS.
but still not enough space to install all above materials in 49 mm space.
how the best design for this very short space?
I have a problem with my rich glycol exchanger drain line. I have this vessel already stand above platform, and the space length from bottom flange (for drain) to floor is only 49mm. My piping engineer suggested to configure the bottom drain to be:
1. SS Blind ½ 150# with drill hole ½ FNPT
2. Male connector ½” OD x 1/2” NPT ,double ferrule,316 SS
3. Tubing ½” OD x 0.049” WT tubing seamless,fully annealed 316 SS, ASTM A269
4. Valve ½” OD,Ball , Double ferrule,316SS.
but still not enough space to install all above materials in 49 mm space.
how the best design for this very short space?





RE: Bottom drain line limit space
RE: Bottom drain line limit space
RE: Bottom drain line limit space
Alos look up orifice flanges which include a small hole which goes out to the outside.
My motto: Learn something new every day
Also: There's usually a good reason why everyone does it that way
RE: Bottom drain line limit space
Also, you apparently only need a small drain port, not a 1" line, 2" or 6 inch dia drain, right? (metric would be 25 mm, 50 mm, or 150 mm drain line, right?
If so, can you lift the tank temporarily or roll it over or tilt it sideways so you can get access to the bottom of the tank?
If your specification permit, drill and tap a 1/4 inch NPT (or 1/2 NPT) threaded female hole into the bottom of the tank. Screw in a Swagloc (or equal) street elbow into that NPT female-thread hole, aiming the Swagloc end of the street elbow towards your (future) drain connection on the top of the concrete. Put the tank back on its foundations, then connect up the 1/4 stainless tube drain tubing to the Swagloc end of the street elbow. Run the drain tubing - remember to anchor it into the concrete! against movement, and remember to protect the fragile 1/4 tubing against stepping damage and vehicle traffic. Remember to run the 1/4 tubing "always down" and put a 1/4 inch valve as close to the tank as possible to avoid freezing the drain line.
If all-welded connections are required. Do the same, put drill a hole into the tank at the drain point, but drill it to the OD of the 1/4 stainless ? pipe drain line. Pre-fab a <49 MM run of pipe down with a pipe bend and outlet stub to get clearance to get the pipe out from under the tank. Then add a drain valve etc. You will be by this time already needing a gouge into the concrete to get room for the body of the valve while maintaining a drain 'down" path. The stub length + pipe bend + pipe horizontal run may kink: you might need to try several times.
Alt: Ram the end of a butt-weld short radius 1/4 elbow into the drilled hole in the bottom of the tank, then fillet-weld the butt-weld elbow into the drilled hole with an external weld. It will "not quite" be right, but if the poor fitup internal crevices at the bottom of the tank (non-food service for example where trapping gunk and solids will not cause your design to fail) you will be able to keep your fluid from leaking out.
RE: Bottom drain line limit space
Regards,
Mike
RE: Bottom drain line limit space
Along the discussion on my office, here is new configuration of the bottom drain:
1. SS 316, Blind ½ 150# with drill hole ½ FNPT , Reference ASME B16.5, thickness tf = 9.6 mm
2. Instrument pipe fittings, MALE ELBOW (Male NPT Both End), SS 316, Reference vendor HOKE : Length height is +- 36 mm
3. Instrument Valve ½” FNPT,SS 316
4. Male connector ½” OD x 1/2” NPT ,double ferrule,316 SS
5. Tubing ½” OD x 0.049” WT tubing seamless,fully annealed 316 SS, ASTM A269
I'm sorry I cant have the sketch. The document secured.
RE: Bottom drain line limit space
RE: Bottom drain line limit space
Seems like we have mistake at the design (very short at the bottom), but I dont have deep understanding about vessel design.
If we use tubing and fitting to cover drain system, is it high or low possibility to occur a clogging from the debris/ solid material from condensate? because 1/2" tubing is smaller than 1/2" pipe. And the fitting is small also.
RE: Bottom drain line limit space
Will they let you cut a "notch" in that grating to put a flange in the horizontal drain piping?
How far does the drain piping have to run, and (after it reaches the edge of the raised grating, does it have room to run down so a flange can be inserted there?
Where do you want your drain valve?
RE: Bottom drain line limit space
Design and make one bolted thick blind flange (2" perhaps) to suit the nozzle. Drill a radial 1/2" hole on the edge of this blind to the centre of the blind. Drill a 1/2" hole in the centre of the blind to connect the internal exchanger space with this drain hole. Thread the radial opening to enable fit a threaded plug. Alternatively, weld a 1/2" flanged nozzle on the side of the 2" thick blind. Install the 2" blind and close the drain opening (threaded plug or 1/2" blind flange). Job done.
RE: Bottom drain line limit space
1. blind flange with drill hole 1/2" nptf (+/- 9.6mm)
2. elbow, 1/2" nptm (+/- 36mm)
then after elbow, we put ball valve, male connector then 1 m tubing with plug at the end (because we dont use permanent container for the drain fluid). in this situation, drain fluid will be flowed to portable container.
Is any problem with the configuration or any hazard will be occurred by those installation?
RE: Bottom drain line limit space
Cheers,
gr2vessels