Valve supplier Bilfinger Intervalve Africa (BIA), investigated the steam system of a paper mill to allow for possible improvements that can be made. Top performers in the paper and pulp industry are constantly striving to increase productivity and quality while minimising costs. The main aspects that need to be addressed in achieving operational excellence are a reduction in energy costs, chemical use, production downtime and process variability.

“The correct selection, monitoring and servicing of control valves can result in financial rewards for clients,” he points out.

Underhill mentions that the functions of control valves in the paper and pulp industry are extremely diverse. They range from the required accuracy of the dosing valves, and the tight control and fast-acting requirements of the basis weight valve to the severe service requirements of the power and steam system such as the control of cavitation and noise.

Careful consideration should be given to the selection of a control valve, as the specific function which it needs to fulfil in sizing and style has to be considered, he states.

Underhill explains that the process of selecting the correct size, style and characteristics of a valve is paramount in the initial stages of a project. Incorrect sizing of the control valve could result in the valve not operating in a good control range, leading to the possibility of excessive wear and loss of controllability.

Certain valves have been specifically designed to operate in different applications – incorrect selection can lead to cavitation or flashing damage, excessive plant noise and poor control in areas such as basis weight, affecting paper quality. Valves used in incorrect applications can lead to undesirable process variability.

Control valve assembly consists of three prime components – the valve body, actuator and positioning. These components need to work in harmony with one another to fulfil the client’s control requirements. Poor performance of any of these components can lead to poor control of the process, leading to unacceptable process variability that can seriously affect the user’s bottom line, he explains.

The advent of the smart positioners on control valves, as well as emergency shutdown valves, have resulted in many benefits for the client, Underhill notes. The Fisher DVC2000 and DVC6200 series digital valve controllers add accuracy of the valve position along with valve diagnostic capabilities that will determine the health of the valve.

Using the downloaded information from the device, either from advanced diagnostics or the online performance diagnostics, allows for maintenance programmes to be adjusted to cater for the more problematic valves. This will avoid the removal and stripping of valves that are in good health, which is costly and time consuming, he explains.

Overlaying downloads obtained from valves over time will assist the client in moving to predictive maintenance and reducing expensive stock holding of spares.

In conjunction with control valves, it is important to be aware that good-quality, hand-operated or automated isolation valves should be used in certain applications to protect the control valve, Underhill says.

“Bilfinger Intervalve Africa has a wide range of quality products to fill this role,” he concludes.

South African motorists were sent into panic once again this past weekend as oil refineries were shut down due to a lack of crude oil.

This comes after Sasol Ltd declared force majeure at its second biggest refinery on Friday due to a lack of crude oil.

On Monday, Sasol said it will restart its refinery by the end of July.

The shutdown of the Natref refinery around 100 kilometres from Johannesburg has sparked concerns of petrol and diesel shortages in the country where 60% of fuel products are imported.

Sasol, however, said it did not expect any shortages.

Sasol is the only producer of petroleum products in South Africa through its two refineries – Secunda, with output of around 150 000 barrels per day (bpd) and Natref, around 108 000 bpd.

“The crude tanker has arrived in Durban and cargo dispatches are under way. Natref should start-up to run at maximum production capability by end July,” Sasol said in the statement.

The company, which owns the Natref refinery with a subsidiary of France’s TotalEnergies, said it does not “anticipate any fuel supply shortages to fuel stations, including our own”.

Meanwhile, South Africa’s Energy Department said the country will not run out of petrol and diesel.

The department’s deputy director-general of mineral and petroleum regulation, Tseliso Maqubela, said, “I don’t expect that diesel and petrol would be affected greatly, however, we are concerned about the impact this is going to have on the availability of jet fuel, particularly for the airports”.

Maqubela said officials would use this week to assess the impact of the move and what it would take to recover.

“There is the ability to import fuel in the country. We’ve always planned for such an eventuality but I think the impact on jet fuel, because this was something that was not expected, is something we’re going to have to look at,” Maqubela said.

Polluted water and run-off from mines and quarries require pumps that can handle these highly acidic liquids. To meet this challenge, Tsurumi has continued developing its range of submersible pumps that are made of 316 stainless steel casting.

Since its foundation in 1924, the Japanese company Tsurumi Manufacturing Co., Ltd. has been engaged in the manufacture, supply and sales of pumps, environmental devices and related equipment, with submersible pumps being key products. As well as producing general drainage pumps, Tsurumi puts great effort into applications for difficult-to-handle liquids, such as corrosive and high temperature liquids and seawater. The company is now launching its LH-14/LH-W-14 series corrosion-resistant pumps, which are suitable for drainage of corrosive liquids in mines.

Tsurumi’s submersible corrosion-resistant pumps are made of 316 stainless steel, allowing the LH-14/LH-W-14 series to handle corrosive acidic liquids and chemical liquids with low pH values. These pumps use highly corrosion-resistant materials for all parts that are exposed to fluids, including the impeller, pump casing, motor frame, outer cover, strainer stand and flange, so that the pumps are thoroughly protected from corroding. Stainless steel Tsurumi puts particular effort into developing submersible pumps made of 316 stainless steel casting. Recently, polluted water and run-off from mines and quarries have been cited as social problems in many countries, to the point that demand for pumps that can handle these liquids has been increasing year by year. In fact, more than 40% of the run-off from mines is strongly acidic with a pH value of less than 4. To meet this application, Tsurumi has continued development of all stainless steel pumps that are made of 316 ­stainless steel casting.

Because they are made of stainless steel casting, the pumps are resistant to wastewater containing abrasive substances, as well as corrosive liquids. These pumps have been designed to deliver the durability needed in harsh fields where pumps made of aluminium, stainless steel and cast iron suffer damage in a matter of weeks, if not days. Stainless steel casting considerably improves product ­reliability in comparison with ­stainless steel in applications involving heavy-duty work. Tsurumi’s all stainless steel pumps are intended for service in harsh ­environments such as mines and quarries and can cover a wide range of applications.

The LH-14/LH-W-14 series is a submersible stainless steel casting high head corrosion-resistant pump designed for handling aggressive and corrosive liquids. The all wetted parts are made of 316 stainless steel, enables it to withstand demanding conditions found in construction, aggregate and mining applications. Being the pump cylindrical and slim, it can be installed in a well casing for deep well dewatering.

The center flange construction assures a stable installation even if fixed by the discharge pipe. The pump incorporates seal pressure relief ports that prevent the pumping pressure from applying to the shaft seal. Furthermore, to endure even extended operation at low water level, these pumps feature flow-thru design that forcibly cools down the motor.

The LH-14 series has a single impeller, and the LH-W-14 series has dual impellers. The LH-14 and LH-W-14 series are available in a wide product lineup, covering a discharge bore diameter of 80 to 200 mm, motor output of 11 to 110 kW, and maximum head of 51.8 to 184 m.

These pumps, as well as Tsurumi’s general drainage pumps, are equipped with an anti-wicking cable, motor protector, SiC dual inside mechanical seals with silicon carbide faces, and Oil Lifter, with extensive research and a track record accumulated over many years combined into Tsurumi ­original technologies.

The material used for rubber parts such as the mechanical seal, oil seal, O-ring and packing, is FPM (FKM), which provides high resistance to heat and chemical exposure. With these features, Tsurumi pumps are designed to provide high reliability and excellent ­durability, enabling continuous operations for long periods.

Experience and expertise Making skillful use of the experience and expertise of many years, Tsurumi focuses on the development of products that can withstand demanding applications. Tsurumi offers a range of products that can serve in harsh conditions such as draining high temperature liquids and seawater as well as corrosive liquids. To order our products, please contact us direct. •

Vesconite Bearings is supplying a Georgia-based vertical-turbine pump manufacturer with a 5000-unit blanket wear-rings order, allowing the manufacturer to request low-friction Vesconite Hilube polymer wear rings for 10 of its vertical-turbine-pump models.

The company ordered its first Vesconite Hilube wear rings in 2015 and, after testing, started ordering larger quantities from 2017. In March 2019, Vesconite visited the pump manufacturer and finalised fixed volume requirements and pricing for the blanket order. The company supplies the central and south-eastern USA with pumps for the municipal, industrial, fire and flood-control industries.

The order covers a one-year period and allows the company to regularly draw on the 5000-unit blanket wear rings order. Vesconite Bearings technical sales representative, Charlie Simpson, said: “The company sees the value of using the product and has switched all of its wear rings to Vesconite Hilube ones in all of its own-brand vertical-turbine pumps.”

Vesconite Hilube wear rings allow for extremely close clearances to ensure greater pump efficiencies and are designed for use with mildly acidic or basic liquid

SCHROEDAHL, a CIRCOR International brand has announced that new, self-modulating TDL Automatic Recirculation Valves (ARVs) are now available in cast material that is more than 35% lighter.

The all-in-one pump protection solutions are designed to keep pumping systems running smoothly in firefighting, refinery, power and chemical applications without cavitation or overheating.

Unlike control valve packages, the self-operated flow-sensitive Schroedahl TDL Automatic Recirculation Valves operate without a separate power supply or any control system and begin protection as soon as they are installed.

The valves combine a high-quality main line check valve and the automatic bypass control system in a new, durable design. The valves’ self-actuated integrated bypass control function ensures minimum flow rate, guarding pumps against overheating and cavitation. The systems provide high pump stability with less vibration and fewer coupling or gear problems. TDL ARVs’ modulation bypass function also offers savings for operators with reduced energy consumption for frequent partial load operation.

Additionally, the bypass check valve prevents reverse pump flow, and allows for parallel pump installations.

Blackmer, part of PSG, a Dover company, has announces that its GNX Series Sliding Vane pumps are now available in 3-inch and 4-inch models.

The GNX Series pumps are alignment-free reduced-speed positive displacement pump and have been designed for the transfer of non-corrosive, non-abrasive industrial and petroleum products for both portable and stationary applications.

Originally launched in 2017 in 2-inch and 2.5-inch models, Blackmer GNX Series heavy-duty sliding vane pumps include the features of Blackmer legacy GX Series pumps but also incorporate a commercial-grade, single-stage gearbox, motor and baseplate.

The new gearbox fits between the motor and pump and is held in place by a permanent dowelled connection that creates a structural link between the high-speed and low-speed sides of the system. This results in a pump that will not need to be realigned either at initial installation or following maintenance. The 2-inch and 2.5-inch models have aluminum gearboxes and the new 3-inch and 4-inch models have cast iron gearboxes.

GNX Series pumps provide flow capacities ranging from 7 to 500 gpm (25 to 1,893 L/min) at working pressures up to 175 psi (12.1 bar).

Wanner Engineering has introduced the Hydra-Cell D66 Series seal-less positive displacement pumps for use in processing, OEM, municipal, and commercial applications.

The new Hydra-Cell pumps offer a maximum flow capacity of 65.7 gpm (248.7 l/min) and pressure ratings up to 700 psi (48 bar) for models featuring brass, ductile iron, or 316L stainless steel (metallic) pumps heads and 250 psi (17 bar) for models equipped with polypropylene (non-metallic) pump heads.

The company says that the seal-less design of Hydra-Cell D66 pumps means that there are no mechanical seals, cups, or packing to leak, wear, or replace. It has spring-loaded, horizontal disk check valves and the D66 seal-less design allows it to handle viscous fluids and abrasive particulates up to 800 microns in size. The D66 also features Wanner Engineering’s Kel-Cell technology so that in the event of a closed or clogged inlet condition, the D66 will run dry indefinitely without damage to the pump.

The new Hydra-Cell D66 is available with NPT or BSPT as well as SAE flanged NPT or BSPT ports and with a choice of pump head, valve, diaphragm, and o-ring materials.