CHEMAC, the US-based industrial service provider now offers two pump systems that are of particular value to the oil and gas industry.

Their Process Equipment Division (PED) specialises in high-pressure equipment (pumps, valves, piping, etc.) and services for all types of chemical, petrochemical, oil and gas process equipment requiring positive pressure applications.
Pressure ranges from 100 to 208,000psi and flow ranges from 0.0003 to 1,400 gallons per min.
From individual pieces of equipment, pilot plants, to complete commercial size production facilities for high-pressure applications including LDPE, Urea, Melamine, carbamate, ammonia, heavy oil, toxic and non-toxic mediums, etc. Pumps are positive displacement, metering gear, diaphragm, and plunger types.

Non-pulsating pumping of Non-lubricating liquids
With its magnetic drive gear pump, Gather, one of Chemac’s clients, offers an important product for transfer and metering applications.
Utmost manufacturing precision, a variety of materials as well as non-pulsating pump operating characteristics are indespensible product design prerequisites. Variable-speed pump drives are available to satisfy all application needs.
The magnetic coupling of the gear pump enables the complete pump to be hermetically sealed so that when appropriate materials have been selected maximum safety can be warranted when hazardous liquids are to be handled.
In the event of overloads of the pump the magnetic coupling decouples. The drives conform to VDE specifications and are available with any protection system and with any explosion proof protection.
Gather magnetic drive gear pumps offer capacities between 0.06 l/h and 1,500 l/h (.0158 to 396 gph), and are available in 2 sizes and 7 tooth widths.
The pump can be tailored to customer requirements and thus enable the handling of nearly all media including non-lubricating liquids with temperatures from -60°C to +315°C.
The pumps are hermetically sealed and can also be operated under vacuum. Depending on the liquid handled the differential pressure is 15 bar maximum.
For a viscosity between 0.1 and 2,000 mPa s the entire speed range is available: 10 - 6,000 RPM.
A pumping test will be required for viscocities between 2,000 and 10,000 mPa s. The main advantage of the gear pump is that it delivers a non-pulsating media stream.
Advantages of the system include: non-pulsating, linear liquid flow; a magnetically coupled system; hermetically sealing; no damage due to overloads; no shaft seals resulting in low maintenance requirements; pump operates without valves; numerous drive configurations for any application; low mechanical power needed; high pump speeds over a wide control range; electronic speed control; pump capacity reproducible as desired; pump operates in positive or negative pressure conditions; and heating jacket are available.

Reciprocating high pressure hydraulic pumps
Chemac also represents the leading pump supplier for high-pressure pumps for the LDPE industry - UHDE.
UHDE has been manufacturing pumps since 1935 and high-pressure pumps for High-pressure LDPE since 1954. To date, over 900 high-pressure pumps are installed world-wide.
The standard UHDE high-pressure pumps with hydraulic drive are plunger pumps with two or four plungers.
Basically, they are hydraulic pressure intensifiers, consisting of a hydraulic low-pressure part and a high-pressure part. The purpose of separating these two basic parts is to enable the pumps to be assembled by the unitised construction principle.
The low-pressure part is fed by a variable-output axial piston pump which is driven by a constant-speed electric motor.
The hydraulic oil from the axial piston pump is alternately directed by a mechano-hydraulic four-way valve, which is hydraulically actuated by the moving plungers, to the two ends of a double-acting hydraulic cylinder whose piston rods are positively coupled to the plungers of the high-pressure part.
Control of the discharge rate of the high-pressure part during standstill and also while the pump is in operation is effected by regulating the axial piston pump throughput proportionally to the stroke frequency.
In addition, the discharge rate may also be varied during standstill by changing the stroke length. The accuracy of regulation is less than 1.5 per cent, above or below.
Uhde high-pressure pumps are used for a great variety of industrial processes with pressure ranges starting at 125 up to 14,000 bar (2,000 - 200,000 psi) and discharge capacities from 10 - 20,000 l/hr (3 - 5,000 gph).