Danfoss 180B1008 PAHT G 12.5 Ultra-Pure Water Pump

Danfoss 180B1008 PAHT G 12.5 ultra-pure water pump

The Danfoss 180B1008 is the PAHT G 12.5, a coated water-lubricated axial piston pump that is intended for technical water: ultra-pure water produced by repeated reverse osmosis, de-ionised water and demineralised water. It displaces 12.5 cm³ per revolution, works up to 140 bar g, weighs 7.7 kg and has an AISI 304 housing with NBR seals. The G in the designation indicates the extra coatings that reduce wear on the sliding parts, which is the issue that makes ultra-pure water difficult for ordinary pumps, and it is the reason the PAHT G range is the common choice for gas turbine fogging and fuel-wash skids. Seven Star LLC supplies the 180B1008 in Oman and the GCC as an independent supplier in Muscat.

The pump belongs to the PAHT G 2 to 12.5 group, whose sizes share a body, so the 180B1008 is physically identical in envelope to the PAHT G 10 but with 25 percent more displacement.

Decoding 180B1008 and the PAHT G designation

180B1008 technical specifications

What the coating changes in practice

Ultra-pure water is aggressive for sliding metal pairs because it has almost no dissolved salts to help form a protective film and no lubricating properties. A standard PAH water pump is designed for tap water; the PAHT G range uses extra coatings to reduce wear in this condition. As a result the minimum continuous speed is higher (1000 rpm rather than the 700 rpm of the tap-water PAH pumps) and the maximum outlet pressure of the 12.5 size is 140 bar rather than 160 bar. The inlet is also limited to 4 bar g, with a very specific peak definition, so a transfer pump upstream should be selected with that limit in mind.

Flow is proportional to speed: 12.5 cm³ × 1500 rpm is 18.75 l/min theoretical, and the data sheet figure at maximum pressure is 16.5 l/min, an internal leakage of about 12 percent, higher than in tap-water pumps because ultra-pure water is thinner and more clearance is lost. Designers should size the delivery from the data sheet value rather than displacement alone.

180B1008 in the PAHT G 2 to 12.5 group

Above this group the PAHT G 20 to 32 and PAHT G 50 to 90 sizes, and larger up to PAHT G 308, cover higher flows. The tap-water equivalents such as PAH 25 (180B0036) are listed separately.

Selection and ordering checklist for PAHT G 12.5

• Water type: ultra-pure RO permeate, de-ionised or demineralised water, not seawater.
• Required flow, working pressure up to 140 bar g, and turndown, remembering the 1000 rpm minimum speed.
• Inlet pressure not above 4 bar g; check any boost pump and tank head.
• Whether the pump will run in a hazardous area (ATEX 180B6133) or needs API documentation, which the manufacturer offers on request.
• Motor and drive details, bell housing and coupling.
• Reservoir, filtration (10 µm absolute, beta 5000) and the monitoring switches.

Installation and commissioning

The manufacturer describes both open and closed system layouts. In a closed system the filter sits in front of the tank; a pressure switch set at 2 bar g maximum inlet pressure signals a blocked filter, a temperature switch in the tank stops the pump above the temperature limit, flexible hoses reduce vibration, and a non-return valve and pressure relief valve protect against backspin and over-pressure. A minimum level switch above the reservoir outlet prevents dry running, and a filling valve ensures that new water is always filtered. Use dampers on the frame and avoid rigid pipe connections to reduce noise. Under the specified conditions service intervals of up to 8000 hours can be expected.

Applications for the 180B1008 in Oman and the GCC

Gas turbine inlet fogging and fuel wash systems at power and industrial plants, NOx reduction injection, adiabatic cooling of server rooms and factories, humidification and dust-suppression systems, and high-pressure cleaning with ultra-pure water in electronics manufacturing all appear on the manufacturer application list. In Oman the gas turbine fogging application is the most relevant because high ambient temperatures reduce turbine output and fogging recovers part of it; the pump must therefore be rated for tank temperatures that can rise in summer, within the 50 °C media limit.

Information to send with an RFQ for 180B1008

• Code 180B1008 and quantity.
• Water source and quality, such as RO permeate or demineralised water, and supply pressure.
• Flow, pressure and duty cycle.
• Motor and drive details; ATEX or API needs.
• Delivery location and any spare parts.

Documents and quotation

The Danfoss PAHT G data sheet covering this pump is attached on this page.

Send the code number 180B1008 and your duty data and we will confirm availability and a quotation for Oman and the GCC.