Designed primarily to pump oils, the Triro pump has an axial pulse free flow making it the best solution for sensitive forced lubrication, seal oil circulation and oil firing applications.

Pumps are available in 17 frame sizes with various pitch angles and lengths offering a wide flow and pressure range.

Units are available from a low cost cast iron pedastal mounted version to high pressure steel cased pumps for API 614 systems. Triro pumps are also available in the popular tank-top mounting arrangement for space saving on lube oil consoles, and vertical deck mounting for marine and other space saving transfer duties.

		The Triro pump is of the positive displacement axial flow screw type with only three moving parts - a power rotor and two idler rotors. These three rotors (hence the brand name TRIRO) have accurately machined intermeshing threads which enfold the liquid being pumped and act as seals in relation to each other and to the pump body or sleeve in which they rotate.
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Plenty Mirrlees have extended the range and versatility of the 6000 series triple screw pump to offer more flow selections, higher pressure capability, more configurations and additional mounting options. The type 7 insert has been re-designed to form a pump in its own right, without the need for an additional casing, primarily for direct machine mounting and tank top versions. The type 7 insert retains dimensional interchangeability with its predecessors, the types 5 and 6 in respect of the critical dimensions for mounting in new and already installed 6000 series pump casings.

The type 7 offers a much improved and extended range yet retains all the interchangeability required for servicing the existing pump opulation.

		•Cast iron casings have been upgraded to Ductile iron (SG iron) to improve the reliability and integrity    of these critical pressure containing components. This upgrade improves the acceptability of the    product of oil industry installations.
		•Short lead (SL) screwsets have been introduced as an alternative pitch to the existing screwsets,    known as normal lead (NL).This option effectively provides two alternative flow rates for each insert    frame size, doubling the number of pumps available in the range. This shorter pitch screwset, with    lower axial velocity and more sealing points along its length, provides a higher-pressure capability.
		•The short lead (SL) screwset pitch provides a flow displacement (flow before slip) 80% of the    equivalent size normal lead (NL) version.
		•Within the 6000 series insert and pump the maximum pressure rating of the short lead (SL) screwset    is increased by 20% over the equivalent normal lead (NL) version.
		a. NL maximum pressure 600 psi
		b. SL maximum pressure 720 psi
		The section lift capability is increased with the short lead (SL) screwset. The pump requires less 'net    inlet pressure' to operate than its equivalent normal lead (NL) version.
		See performance overview (page 6) and the pump performance tables (pages 8 to 19) for full pressure    and NIPR capability across the full operating viscosity range.
		•The type 7 insert has various suction end connection options which allows the insert to be used as a    direct driven machine mounted pump (typically on large rotating machines as a direct driven lube oil    pump) or as a lube system tank top mounted pump without any additional casing.
		•The insert can be pedestal or bracket mounted to form an economical horizontal pump where a    ductile iron case is not deemed necessary for the environmental of operation.
		•Vertically mounted pumps with fabricated steel casings are an addition to the range.
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