Have you seen problems with oxygen (air ingress)? The MEG and the natural gas are then piped back, as a mixture, towards the mainland. If desired dew point is met then no change of the glycol is needed. If the paraffin gets into the glycol system, a three-phase liquid hydrocarbon separator can be placed on the rich glycol side to remove the paraffin before it enters the reboiler. The particulate, whatever it is will foul the fire tubes, reduce the capacity of the reboiler, and foul the exchangers. Reduces the possibility of water freezing in piping As you tackle your next project, take the time to familiarize yourself with the equipment and operating conditions. The elevated temperatures of the striping gas increase its hygroscopic properties to the point that it grabs onto the remaining water molecules in the glycol and carries it out through the still column. It is imperative that the right type and size of tower packing be used for the replacement. Another type uses carbon in a metal canister. The reboiler temperature and pressure control the concentration of the water in glycol. Purchase Gas Dehydration Field Manual - 1st Edition. A rectifier is used to refine or purify by distillation, especially by distilling again and again. The vessel should have a length/diameter (L/D) ratio of 5:1 or better. Why not? Other glycols may be acceptable. INTRODUCTION. Most operators dont like to do this but it can really help prevent glycol loss. boric acid and propylene glycol for termite control Previous boric acid and propylene glycol for termite control Also, note that many pumps struggle with the high temperature requirements of glycol dehydration. I have obtained the latest Glycol sample lab analysis report . That is usually accomplished by installing a globe valve on the inlet to the coils and a bypass between the inlet and outlet with another globe valve. Glycol samples only need to be drawn initially unless a significant problem is found during analysis. At constant temperature, the water content of the inlet gas increases as the pressure is lowered. Finally, the cooler could be under-sized for the system. The first question I would ask is what type of exchanger you have. Is equipment clean? . The ceramic saddles in the distillation column powdered and plugged like a chunk of concrete. Next, over-circulating the glycol may also be a cause check your circulation rates to make sure you are not over-taxing the system. The absorber must be vertical to ensure the proper flow of glycol in the vessel and adequate contact of gas and glycol. When this condition exists and glycol is pumped into the absorber, the liquid has difficulty flowing down through the downcomers. The glycol dehydration unit Wet gg( q )as (no liquid water) enter bottom of absorber and flows countercurrent to the glycol. Glycol boiling point is 546F, but the degradation temperature of glycol is 404F, so do not operate the reboiler over that temperature. If these salt removal systems are not available, what should we do? Dehys that are in fields with plungers and/or intermitters are heavily affected by this. If the pressure drop across the absorber suddenly rises about 20 lbs and the glycol removed from the system does not foam, the foam problem is usually a mechanical type. For more information about our fabrication services and our selection of dehydration units, feel free to call us at 403-314-5422 or toll-free at 1-800-993-9958. If the vessel has no provision for back flushing with water to remove loose dirt, what can be done to remove the dust? You also need to know how each phase issupposed to work and how it is working in comparison. Yes. Vol 08 No 11 Temperature Control in a Split-flow Absorber in LNG : 498.85 KB : Vol 08 No 12 Mass Transfer Pinches in Amine Treaters Part I: Lean-end Pinch Using MEA . If my guess is correct, then it is actually quite common for hydrocarbons or NGLs to condense out of the dehydrator vapor line. According to the EPA, there are about 3500 . If you operate a glycol dehydration system, short of something spewing, leaking or catching on fire, the most common and troublesome problems come in the form of a symptom that you have to find a cause for. By inspecting the firetube or by shutting off the burner on the reboiler at night and looking down the firebox. The two most popular sizes are 4 x 10 and 8 x 30. More temperature causes more water and hydrocarbon vapor in gas stream. TEG is the most common glycol used in these absorption systems. The paraffin would quickly plug the filter elements. Glycol analyses help pinpoint high glycol losses, foaming, corrosion, and other problems. Telemark University College . The same can be said for discrepancies in flow rate and temperature. As the overall process conditions change, it is important to see that stripping gas is still needed. Replace glycol This lowers the amount of reflux produced by the coil and reduces the load on the reboiler. Therefore, a portion or all of the rich glycol should bypass the reflux coil. A damaged demist pad in the top of the absorber and high gas velocities can sharply increase glycol losses. . Either salt removal method can be portable. It could also just be solid particles from the gas stream that have built up over time and charred in the hot liquid. For example, suppose your equipment is designed to operate at 1000 psi. The dry fuel gas will remove the additional water. Glycol Regeneration: 5 Ways to Maximize Glycol Purity, Lever Operated Piston Balanced Throttling, Pneumatically Operated Diaphragm Balanced, Pneumatically Operated Piston Balanced Throttling, Free Water Knockout Mechanical Three Phase, Horizontal Separator High Pressure Pneumatic Three Phase, Horizontal Separator Low Pressure Mechanical Three Phase, Vertical Separator High Pressure Electric Three Phase, Vertical Separator High Pressure Pneumatic Three Phase, Vertical Separator Low Pressure Electric Two Phase, Vertical Separator Low Pressure Mechanical Two Phase. You are correct, 180 F is the top running temperature for most pumps. There was also significant evidence of Black sludge with decomposed glycol observed at downstream customer pig receiver and slug catcher, observed during pigging operation. Check the specs of your pump to make sure you are working in operating limits. These very light hydrocarbons can cause tray flooding or foaming in the absorber and excessive glycol losses from the absorber and reboiler. Let's connect cobb county small business grants 2022 soap ingredients list smartbanner appsflyer skyrim recorder tracking lost files locations Discoloration of the glycol indicates contamination. pressure, LTS temperature, and glycol circulation rate were used to develop the process simulation case for the EG injection process. The tower packing manufacturer should be consulted for design information. The type and thickness of the mist pad should be carefully studied to minimize glycol losses. This is accomplished by opening the manual valve until the reboiler can hold the temperature. The carbon-packed vessel should have a liquid distributor to avoid channeling. I am surprised every day by something in this industry. As the contact trays in the absorber get coated with gummy deposits, some of the bubble caps or valve trays will get plugged. Steam cleaning is not very desirable. What type of glycol is best? This is usually not recommended because the side effects can be detrimental. A vacuum on the casing pulling air from the surface into the tubing (Major long shot) A surplus reboiler can even be used, if properly operated. The gas moves up through the vessel and the glycol moves downward through the vessel. In the extremely hot case of the gas at 40C and the glycol at 60C, the profiles in FIG. The increase in boiling temperature is due to pure ethylene glycol having a much higher boiling point and lower vapor pressure than pure water, . Each monthly newsletter includesinformation on product improvements, tips on how to better optimize your site, videos and articles on how to complete your own repairs, as well as news about training and events. Normally, a good element made from cloth fabrics is best. How can the iron compounds be removed? Since the reboiler temperature of the glycol stripper is limited to about 400 F . Here are some causes of excessive glycol consumption. If too high, the glycol vaporization losses with the water vapor will increase. About how many of these dehydration units are in operation in the U.S.? Should I throw the glycol away when it gets black? Our gas-glycol pump maintenance costs have been very high. If your operating pressure is 200 psi and you are still flowing 50 mmscf, you will immediately know that you are out of spec. Can glycol decompose even though the reboiler is designed and operated properly? "The upstream gas directed to the . You are pulling more liquids back from tower and reboiler is fighting to keep up with it. Are there any limitations to changing pressure on the absorber? . F - Outlet dew point temp. . Line separators on the sales gas leaving the absorber can sometimes be effectively used. They are usually referred to by the names of their original patent holders, such as Drizo, Coldfinger and so forth. This will increase the pressure drop and the glycol losses. The rich glycol (wet with absorbed glycol) collects in the hat tray at the bottom of the tower and flows to the power side of the glycol pump. A much lower temp would reinforce the possibility of too much exchange. This will increase the efficiency of the reboiler so that it does not have to expend more energy to heat the glycol to the optimal temperature for water removal. Or a flow meter could be installed. What happens if my glycol circulation rate is too high? What precaution should be taken in erecting a new glycol unit? The glycol and gas also travel counter-currently through the vessel. Im not sure about the decomposed glycol showing up downstream, other than some solids are making it through your filters. If necessary, you can go as high as 201c but it is better to aim for 196 if that will take care of the problem. Water and soap have little cleaning action on the types of deposits found in the glycol system. . When the reboiler temperature is at 200F or below then the plant should be depressurized slowly to prevent a loss of glycol. The pump may have stopped circulating the glycol. A chiller will run without glycol as long as the fluid temperature in the system is above freezing. Our company is making a concerted effort to improve our glycol plant operations. We know from experience, that some heat exchangers chilling abilities is reduced by 20%. Apparently the unit was not cleaned before the new glycol was added. To perform a good troubleshoot on glycol dehydration equipment, you must know what the system is designed for and how the currentconditions compare to that design. Typical reboiler temperatures are 350F to 400F. relate mainly to gas flow, temperatures, pressures, glycol circulation, and lean glycol. This means the chiller with a 10 ton capacity for chilling water will have a capacity between 8 tons and 9.3 tons with 40% PG. We are having to shut the pump down to build temp up. Wet gas enters the bottom of the absorber tower and ascends through a mist extractor where fine liquid particles are removed. American Chillers recommendsInhibited Propylene Glycolwhich works as an anti-freeze, but also includes rust inhibitors and other additives that keeps your pump seals lubricated and fluids and chilled water system running in optimal condition. Can we tell whether the foaming problem is the mechanical or chemical type? A leak on the glycol circulation pump head inducing oxygen into the lean glycol being injected into the tower. 2. Take samples, record initial conditions, and keep track of changes you make. With better gas cleaning, filtration and carbon filtration the glycol may clean up to an acceptable state. Moreover, the injection rate for hydrate . The cooled, lean glycol then flows through a glycol sock filter before passing to the glycol pump. How can we control the lean glycol temperature? What happened? The heat will flash off the hydrocarbons and send them to the flare or VRU and the water will go to the tanks. If the temperature of the glycol has ever risen above 404F, it may be damaged or cooked and will not be as effective at absorbing water vapor from the gas. BOLD is the Industry Leader in Glycol Dehydration with the largest fleet and most advanced technology. Why? Yes. If there are holes in the heat exchanger coil, then the water rich glycol could leak back into the lean glycol, contaminating it with excess water. We also faced a serious glycol shortage several years ago. He provides product and applications training for the Kimrays sales team and customers. During a plant startup, the pressure on the absorber should be brought up to operating range and then the glycol should be circulated to establish a liquid level on all the trays. When things didnt clear up as easily as Id hoped, I had no idea if the conditions existed when I got there, or if I created them with my tinkering. Glycol Dehydration Process In Gas Or Petrochemical Plant. One easy way is to monitor the pressure drop in the absorber. The resulting ice sometimes pushes up into the absorber, damaging the chimney tray. The reboiler temperature should be verified for accuracy, using a test thermometer. Cody Im not familiar with the term vapor recovery tank but I am guessing it is a knock-out or slug catcher that is downstream of the still column. Right type and thickness of the dehydrator vapor line improve our glycol plant operations reboiler temperature and pressure control concentration. For back flushing with water to remove loose dirt, what can be done to remove the water! 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