Month: August 2021

Recently 2 units of vacuum loading solids transfer pump are shipped to Europe client. One model is GNSP-40B, another model is GNSP-20B, the working principal of them are same, just a little different in outlook.

GNSP-40B vacuum pump is the biggest model right now, the designed capacity is 40 m3/h, which can allow max solids size is 75mm, the required pressure is 550 Kpa ~ 785Kpa ( 80 ~114 PSI),min air demand is 17m3/min ( 600CFM), the max solids content allowed is 80% , max discharge distance is 1000m in horizontal, max suction distance is 50m in horizontal, for vertical suction and discharge height, it will depends on the material conditions, we will negotiate this with the customer. The pump is in a frame for convenient lifting and transportation.
GNSP-20B vacuum pump is a mobile design vacuum pump, with 3 wheels for movement in short distance, the compact footprint compared with GNSP-40B. the designed treating capacity is 20 m3/h, which can allow max solids size is 50mm, the required pressure is 550 Kpa ~ 690Kpa ( 80 ~100 PSI),min air demand is 8 m3/min ( 280CFM), the max solids content allowed is 80% , max discharge distance is 1000m in horizontal, max suction distance is 50m in horizontal, for vertical suction and discharge height, it will depends on the material conditions, we will negotiate this with the customer.

GN vacuum pump can be applied for many different industries for material transfer, such as drilling mud transfer, animal waste, oil sludge, tank bottom sludge, waste mud and waste solids transfer, silo transfer, sand transfer, vessel bottom clean out, and other kinds of slurry transfer.
Based on different project requirement, the user can select different model vacuum pump for their project. When compact footprint is required due to space limit, we will select small vacuum pump.

Recently GN solids control shipped one unit of large mud decanter centrifuge system to our TBM engineering client. The technical configuration is as below:

1) One unit of 30 inch bowl diameter decanter centrifuge GNLW764A-VFD, which is the largest model decanter centrifuge we produced, we also have smaller model decanter centrifuge, with 9 inch bowl, 14 inch bowl, 18 inch bowl, 22 inch bowl with different bowl length. The big bowl decanter centrifuge should be drived by GN made VFD control panel, for oil & gas industry, it should be positive pressurized VFD control panel, to comply with CNEX or IEC EX or ATEX explosion proof standard as per client’s requirement. For HDD, TBM, Piling etc construction works, the VFD control panel is a non explosion proof control panel, no need a air compressor for air supply, but the main motor drive, ,back drive motor and pump motor are all controlled by the VFD control panel, to adjust the feed rate , to input different differential speed and input different main bowl speed to reach a better separation result. All of the 3 drives are from world famous brand ABB drive.

2) One unit of GNDW-6000L automatic chemical dosing unit, with treating capacity 6000L/h flocculants, which are installed inside the 20ft container, with windows, doors, lighting, air conditioner and others. The chemical dosing system including 3 compartment stainless steel material mixing tank, each compartment with its agitator, a screw conveyor transfer the dry powder flocculants and add to the mixing tank. The prepared chemicals are transferred to decanter centrifuge feed tube by chemical dosing pump, one for use, one as back up. The chemicals and mud are mixed in the decanter centrifuge feed tube, the ultra fine solids or suspended solids are aggregated into larger particles, so that the solids can be separated easily by decanter centrifuge, to get more pure water and drier solids waste.

Recently one batch of decanter centrifuge are working successfully in South America rig site. The equipments list is as below:
2 units of Decanter Centrifuges : GNLW363C-VFD
2 units of Screw Pump : GNG30-075B

The decanter centrifuges are used to treat water based drilling fluids with high G drying shaker, the working process is that the drilling fluids which are treated by solids control equipments, are collected by screw conveyor, the drilling waste are transferred by screw conveyor to high G drying shaker to separate the coarse solids from the drilling waste, then the fluids drop into the catching tank, and the screw pump feed the fluids to GNLW363C-VFD decanter centrifuge to separate the fine solids from the fluids, the clean fluids can be reused to prepare for new drilling fluids. We have stock in GN solids America for faster delivery for South America client, and the electric motor and VFD control panel are comply with IEC EX for class 1 div.1 application. The VFD control panel is positive pressurized control panel with PLC smart control, the main motor, back drive motor and pump motor are controlled by ABB drive.

The decanter centrifuge bowl material is made of duplex stainless steel 2205, the other bowl components are made of stainless steel 316, the screw is made of SS304, the bearing is SKF brand for reliable operation. The feed rate can be adjusted by changing pump frequency.

The discharged solids will be discharged from centrifuge solids discharge trough and collected by cuttings box, which can be transported by waste truck.
Except for decanter centrifuge, GN solids control also produce vertical cuttings dryer for oil based drilling waste treatment, and also oil sludge treatment system for oil , water and solids separation for oil waste sludge, crude oil tank bottom cleaning sludge treatment, etc.

Recently one set of GNLW554ET-VFD decanter centrifuge with 3 phase separation centrifuge, and 2 sets of screw pump, all installed on one skid for convenient shipment. The treating capacity is 15 m3/h.
The detailed technical configuration is as below:

1) Decanter centrifuge ( 2 phase separation centrifuge for solids liquid separation) GNLW554ET-VFD
2) Disc centrifuge ( 3 phase separation centrifuge) GNSD-125
3) 2 sets of screw pump, one screw pump as decanter centrifuge feeding pump, one screw pump as flushing pump of disc centrifuge
4) Complete skid with pipelines and accessories to install all the equipments on one skid for convenient shipment

GN solids control can design and produce customized oil sludge treatment unit with different treating capacity, such as 1m3/h, 2m3/h, 5m3/h, 15m3/h. According to the material information provided by the client, we can decide if all the modular should be utilized or not. Basically a general oil sludge treatment unit including oil sludge picking pump ( vacuum pump ) , pre-mixing tank modular, coarse shaker tank modular, dewatering unit modular, 3 phase separation modular, etc. the customer bought 3 phase separation unit modular, they will use the filter before feeding to the decanter centrifuge, otherwise they should ensure the max solids content should be less than 30% and max solids content is smaller than 1 microns. The less solids content, the better separation efficiency. The decanter centrifuge should separate the solids as much as possible, the fluids enter into the disc centrifuge should be with solids content less than 3% and max solids size no bigger than 5 microns, to avoid any damage of the vertical centrifuge.
Depends on the oil sludge conditions, the user can use proper chemicals, they can select to buy dewatering unit from GN or user their own chemical dosing unit by adding chemicals into the oil sludge, to increase the treating efficiency.