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CHEMICAL EQUIPMENT UPDATE 


and ensuring the heating system is sealed as an integral part of the vessel. Each vessel’s conical top incorporates a maintenance access manway and is designed to withstand snow loading. Other fittings include a 100mm diameter fill line for bulk deliveries, an overflow with watertight self-sealing flap, and a low-level side entry manway with removable bolted cover. The thermoplastic material is lightweight, robust, corrosion- resistant and requires minimal maintenance: indeed, other Niplast tanks on site, installed more than ten years ago, are still in good working order.


Bulk storage Meanwhile specialist water treatment chemical manufacturer Houseman has taken delivery of five chemical storage tanks from Niplast for its new £3m manufacturing facility at Wythenshawe, near Manchester. The new tanks provide bulk storage for Houseman’s main raw liquid chemicals and are being used alongside two Niplast tanks supplied in 1983, which have themselves been relocated and re-commissioned. As a result of the trouble-free service


provided by the original Niplast tanks, the company was invited to tender for the new vessels. The order is valued at £40,000. . Each tank provides a working capacity of


20 000 litres, taking deliveries from pressurised road tankers: The differing characteristics of the raw chemicals required each tank to be individually designed, taking account of delivery temperatures, specific gravities, material compatibility, melting points and so on.


Tank storage: from fumes to dosing


C 7 ECE


hemical Process Solutions of Seaham, County


Durham, England, designs, manufactures and installs chemical storage tanks, fume extraction systems, chemical dosing systems and more.


Helically wound polypropylene chemical storage tanks and HDPE chemical storage tanks come in diameters up to 3.5m and capacities up to 80m3


polypropylene sheet tanks and


Accordingly, four tanks have been manufactured from polypropylene and one from high density polyethylene (HDPE). Of the five, three have been fitted with frost protection systems, comprising immersion type heaters, rockwool lagging and cladding in the appropriate thermoplastic. All five tanks share the same main


dimensions; 2.5m internal diameter and an overall vertical height of 5.5m. Typically each tank is fitted with level indication, overflow, vent, holding down chairs and sundry flanged connections to suit Houseman’s processes. Ferguson & Menzies, an independent


Scottish company established over a century ago in Glasgow, now boasts two 120m3 thermoplastic storage tanks, the largest to be built in Europe. They were designed, constructed and fitted by Chem Resist. Under the brand name Opus Lubricants,


Ferguson & Menzies distributes pine oils and terpenes to manufacturers of household and industrial cleaning products - and an extensive range of synthetic and mineral based lubricants and chemicals for use by many different industries both in the UK and internationally. In addition Ferguson & Menzies makes and


distributes Adblue - an additive which removes nitrogen oxide from exhaust systems of heavy duty vehicles, enabling them to meet stringent Euro 4 and 5 exhaust emission standards. Chem Resist’s md Simon Hewitt


commented that it had been assumed that tanks of this size were a step too far: “We thought otherwise, and with some additional investment in our production process we cracked the problem.”


HDPE sheet tanks are available up to 20 000 litre capacity and thermoplastic lined GRP chemical storage tanks up to 80m3


capacity . Butt welded


in PVC, polypropylene, PVDF and ECTFE. The company also fabricates equipment for the transfer of corrosive liquids. Mech-Top of Olten, Switzerland, manufactures stainless steel equipment specifically designed to meet requirements of pharmaceutical, chemical, semiconductor, paper, environmental and food technology industries. ”Our experience and the application of modern technology enable us to manufacture and supply professionally designed steel


Despite tight space constraints on site the two leviathans - each 11 metres high and 4.5 metres in diameter - were delivered and safely installed by Chem Resist’s engineering teams.


LINPAC Allibert has been manufacturing


helically wound plastic storage tanks for more than 40 years. These HDPE or polypropylene tanks are extruded in strip form in a novel process. Each wrap is overlaid on the previous one


and fused together to form a seamless cylinder with distinctive bands on the outside and a smooth finish on the inside. The one-piece cylinder therefore has no vertical seams or welds, and is totally watertight. Large bulk storage tanks are manufactured


individually to suit customer requirements (Fig. 1). These tanks are already used to store more than 400 million litres of corrosive liquids across many different industries and types of chemicals. These include: sodium hypochlorite,


nitric acid, sulphuric acid, hydrogen peroxide, hydrochloric acid, aluminium sulphate, ferric chloride, ferric sulphate - plus water, detergents, dyes and bleaches, ciders, beers and wines..


Helical winding process As well as large tanks, the company also manufactures smaller mixing and process tanks and storage bunds using the same helical winding process. “Polypropylene versions are designed for


use at high temperatures (usually up to +90°C), but we can also design tanks for use at higher temperatures or in environments subject to sudden temperature changes.


containers and apparatus produced to meet high quality specifications,” says the company.


Mech-Top offers the option of either factory production on its own premises and those of partner companies or on-site production on our customers’ premises, and are thus able to meet their requirements speedily and reliably.


BMC of Gussago, Brescia, Italy, specialises in the manufacture of tanks and reactor vessel internals in stainless steels and alloyed steels. Its main materials of fabrication include carbon steel, nickel alloys, aluminium alloys, Incoloy, duplex steels, copper alloys, hastelloys and titanium. ❒


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