Gas dehydration packages with liquid media technology (TEG)
These Units are usually installed in Gas Treatment Plant when dry gas is requested. Triethylene Glycol (TEG) is the liquid normally used for obtaining the dry gas product. The dry outlet gas obtained in TEG Dehydration Units are in the range from 7 to 3 lb/MMSCF.
Gas dehydration unit with fixed bed technology (molecular sieves, aluminas, silica gel)
These Units are normally installed in Gas Treatment Plants where the dry gas will be liquefied or used for re-injection into wells. Adsorbent media is usually Molecular Sieve beds 4A or 3A. Water content in the dry gas can be 1 ppm or lower.
Gas Production Unit / Heater Seperator
Gas Production Unit ; Combination of indirect line heater and ASME Code separator.
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Glycol regeneration unit
MEG Regeneration Unit are supplied as stand alone packages; typically associated to LTS Plants where the spent MEG will be regenerated in the range from 60 to 80 wt%.
DEG or TEG Regeneration Unit could be supplied as stand alone packages or associated to Gas Dehydration section. In case of TEG (commonly used for gas dehydration) the max. glycol regenerated purity can reach the value of 99.95 wt%
Gas sweetening unit
Natural gas where CO2 and/or H2S content is present are usually treated in Gas Sweetening Unit. The circulating media which absorb CO2 and/or H2S could be MEA (monoethylene amine) or DEA (diethylene amine) or MDEA (blending of monoethylene and diethylene amine). The acid residual content in the treated product can be reduced to values up to 5 ppm or lower.
HIPPS
The High Integrity Pressure Protection Systems (HIPPS) is a mechanical and electrical system designed in order to reduce the chance that the system pressure will exceed the tolerable allowable pressure. The protection against over-pressure is obtained by quickly isolating the source causing the overpressure.
The entire HIPPS package consists of:
Initiators
Logic solver
Final Element
The initiators are field sensors and they are the inputs required to detect the hazardous condition. The logic solver accepts these inputs and generates correct outputs that change the state of the final elements in order to mitigate the hazardous condition.
H2S Removal with liquid redox
This process is based on a reduction-oxidation reaction- that converts H2S present in sour gas to elemental sulphur through reaction with aqueous ferric ions. Process forms solid sulphur particles that are easily filtered from the solution. Liquid Redox is commonly used when gas stream has an high content of H2S, so solid bed technology is not feasible, and in addition low flow rate results in a non-economic application of direct oxidation process (Claus)
H2S removal units – solid bed technology
Solid bed technology is Natural Gas Sweetening process which achieves a very fine purification, with ultra-low contents of H2S. Hydrogen Sulfide chemically reacts with a solid adsorbent, generating a solid stable and non-toxic product, that can be easily and safely disposed or regenerated.
Indirect water/glycol bath heaters
The main scope of these units is to heat the gas in order to avoid hydrates formation when the gas pressure is reduced.
The gas is heated through a coil/bundle exchanger immersed in a water/glycol bath that transfers heat generated by a burner based fire tube, also immersed in the same bath.
Mechasol can propose tailored solutions according to the Client requests, in a wide range of duties, from few dozens to several thousand of KW.
Valves skid for gas processing unit
Valve skids are usually part of Molecular Sieve Dehydration Unit.
Valve Skids mainly consist of Switching valves associated to the Adsorber Towers. Switching valves are ball valves – metallic seat type suitable to operate at high temperature (specifically during regeneration heating phase). They are equipped with suitable actuators in order to provide the changeover sequence by switching Adsorber Towers under adsorbing stage and towers under regeneration cycles.
Natural gas odorizing unit
PF odorant injection systems can manage different types of odorant, such as TBM and THT, guaranteeing a constant odorization ratio at every gas flow rate.Depending on system requirements, injection may occur either by means of solenoid valves or by a volumetric pump.
In case of solenoid-driven systems, a connection with the high-pressure section of the plant provides the required pressure to inject the odorant into the gas line; regulation of amount of odorant are obtained with micrometric valves and opening time of the solenoid valve.
All systems are provided with a dedicated control unit to manage process parameters, acquire the signals from the metering equipment in the plant and adjust the amount of odorant injected on the base of gas flow. In pump systems, the pump gives the required pressure to inject the odorant into the gas line. The minimum quantity of odorant injected can be set by tuning the stroke of the pump.
The odorant storage tank can be used also as backup system in case of system failure. Part of the gas is sent through the storage tank and, by lapping the surface of odorant, the gas takes away a quantity of odorant into the main stream.
