LARGE REVOLVING DISTRIBUTORS
FOR SEWAGE TREATMENT

INTRODUCTION

Tuke and Bell is one of the UK’s leading manufacturers of sewage purification equipment with ninety years experience in design and production.

The latest computer aided design systems are used to produce a wide range of high quality equipment, serving the needs of both the water industry and domestic customers.

GENERAL SPECIFICATION

The liquid seal is a special design feature of the Carlton series which is achieved by immersing the open ends of the pendant syphons in the liquid remaining at the bottom of the revolving tank. Liquid is transferred from the stationary centre column to the revolving tank without leakage, without the need for packing glands or any other form of sealing between the static and moving parts.

The syphon tubes are full bore, and the absence of restriction eliminates all risk of chokage and the need for frequent cleaning.

The sturdy cast iron column and baseplates are fitted together with machined flanges and the design facilitates accurate vertical alignment of the column.

100mm - 500mm DISTRIBUTORS

For the 100 and 150 distributors, the crown piece and steady roller bearings are self lubricating. The annular tank is cast iron, suspended by rigid steel rods, and of ample depth to cater for considerable Flow variation.

Nylon steady rollers running on stainless steel spindles are fitted in adjustable brackets attached to the bottom of the tank.

Distributing arms fit into sockets on the tanks and are sealed with rubber compression rings. The orifices in the arms can be fitted with ‘Pop-in’ E.P.D.M. jets or gunmetal jets of the ‘Press-in’ or ‘Gripfast’ type. Spray plates can be fitted to jets if required. Standard distributor arms are mild steel, galvanised or painted. Arms in other materials are available on request.

For 200mm to 500mm distributors, the hydraulic principle is the same for the smaller machines but the crown piece is carried on radial/thrust bearings and the annular tank is constructed in galvanised or painted steel.

The Tuke & Bell range of Fabrex distributors is an additional large size range supplementing the Carlton series. They are available in sizes, up to 500mm bore for use on beds up to 60m diameter and are of fabricated construction, eliminating the need for patterns.

This range features optional centre or peripheral, power drive.

FLOW RATES

Since flow rates for any given size of machine vary considerably, dependant on head, size of feed pipe, size of distributor arms etc, it is not possible to give precise discharges. However, for average head conditions, using machines with four arms and feed pipework of similar bore to the distributor, the following flow rates may be expected:

FILTER BED DIAMETERS

The sizes specified above are general. Operating conditions may, however, dictate a larger bore machine working on a smaller filter bed either to cater for intermittent high flow conditions or where a specially high dosage rate is required.

OVERFLOW WEIRS

Where flow rates vary considerably, under gravity or pumped now conditions, the central tank can be fitted with adjustable overflow weirs.

DISTRIBUTOR ARM JETS

There are three types available. The ‘Pop-in’ jet is blockage resistant, easy to fit and relatively inexpensive. In the ‘Press-in’ version the gunmetal bush is a press fit, expanded to ensure a completely watertight joint. The ‘Gripfast’ type has the gunmetal bush retained in the hole by the compression of a plastic ring which effectively seals the sides of the hole from contact with the effluent, preventing corrosion.

Spray plates can be fitted to all three versions.

ARM CLEANING CAPS

There are three types available polypropylene disc, cast iron disc or plug type.

The polypropylene disc is part of the standard range, and can be flange or spigot connection to the arm.

The body of the cast iron disc is bolted onto the arm flange and a bronze door swings across the machined face to seal, using stainless steel clamping screws.

The plug type has a cap held in position by a rubber ring, which also seals the pipe, and is gripped and expanded by a back plate when the gunmetal handle is turned. A half-turn releases the cap for easy withdrawal.

DOSING SYPHONS

There are three types available.

The Single Bend is used where two or more distributors are fed from a common dosing chamber.

The Manifold type simplifies constructural work and is used where only one distributor is fed by a dosing syphon. The Trapped Manifold is also designed to serve more than one distributor, enabling each distributor to be drained whilst the others are working.

All three designs are available in a range of sizes to suit the rate of flow to the distributors. Sizes and dimensions are available on request.

POWER DRIVES

The distributors can be power driven either by an electrical or hydraulic drive system sited at the centre of the machine or a peripheral drive arrangement.

We can also provide drives for any make of distributors.

SPECIFICATION

INSTALLATION

Tuke and Bell reserve the right to modify the design or amend the dimensions in respect of any equipment described on this brochure.

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© 2000 Tuke and Bell Ltd. All rights reserved. Last Updated : 30 July 2004