Plumbosolvency

The need for a method of sampling and testing for lead in water supplies was first recognised by Anglian Water.
Not only was it necessary to measure the quantity of lead, but also to identify why it was occurring and what was the most effective and economic way to provide treatment within complex networks which need to accommodate wide variations in demand and which are being supplied from a large number of sources.

Propensity testing programmes were set up in order to establish the most cost-effective strategies of plumbosolvency control for long term use.

METHOD Sampling is carried out at strategic points in a network in order to provide an overall picture relating to various water sources and zones within the network.
A 3m length of new lead pipe is used to facilitate the sample contact. The contact time is equivalent to 30 minutes. Samples are taken over a period of weeks in order to provide a reliable result.

APPLICATIONS The overall results of propensity testing show where specific problems are and can be used to determine how they can be most effectively tackled.

The results of treatment can be monitored and levels of treatment can be adjusted to maximise their effect.

Compliance with DWI regulations can be easily met and records can be maintained.

SAMPLING UNITS FOR PLUMBOSOLVENCY TESTING On site sampling units are the preferred method for long-term collection of reliable information.

SPECIFICATION The P H PUMPS LTD plumbosolvency unit was specifically designed to meet Anglian water's exacting requirements, including options with telemetry output. It is currently used by AW and other major water authorities. Quality of build, components and finish has been given top priority.

It comprises a lockable, glass-fronted enclosure with a 3m length of insulated lead pipe and a fully programmable PLC controller- The PLC is easy to programme on site by the operator and is lockable to prevent interference. Battery backup is provided in case of temporary power failure.

Continuous indication of status (Flush, Stagnate, Sample and Override) is provided by Leeds, and is readily available at all times.

Forced ventilation ensures the internal temperature is maintained at ambient and prevents the formation of condensation.

SITING The unit is compact and self-contained and is suitable for wall mounting within treatment works, reservoir sites, water towers and pumping stations.