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Chemical Cleaning Services

We have the expertise and experience to clean any system. Our operators are safety passport trained and conversant with all aspects of site health and safety procedures, risk assessments and safe working practices.

We are members of the SAFEcontractor, Constructionline and Legionella Control Association schemes which ensures that all our site based procedures and administration are independently checked and verified.

This allows us to ensure our standard for work is consistently maintained to a very high standard even when subcontracted labour is used.

MA Solutions covers three main areas of Chemical Cleaning.

  • Routine Seasonal Cleaning
  • Renovation Cleaning
  • Pre-Commission Cleaning

Routine Seasonal Cleaning

HSE ACOP L8 for Legionella Control advises a ‘pre-cautionary approach’ with normal Spring and Autumn frequency of Cooling Tower cleaning and disinfection. More frequent cleaning may be required which is dependant on site conditions.

The HSE ACOP L8 would advise the following:

A cooling system should always be inspected, disinfected and, if required, cleaned if there is a significant change in operation status such as:

  • immediately before the system is first commissioned;
  • after any prolonged shutdown of a month or longer (a risk assessment may indicate the need for cleaning and disinfection after a period of less than one month, especially in summer and for health care premises where shutdown is for more than five days)
  • if the tower or any part of the cooling system has been physically altered, eg refurbishment or replacement of pumps, pipework or heat exchangers.

In addition Cooling Towers should be regularly inspected.

The frequency with which these inspections should be scheduled will vary depending on the fouling potential and should be determined by the history of previous cleans and an assessment of the likelihood of fouling, based on the water treatment history and the environment in which the cooling tower is operating.

  • at least every 3-months for a cooling system in a dirty environment (eg a tower)
  • that is prone to process or environmental contamination
  • at least twice a year for an air conditioning comfort cooling system
  • at least every 12 months for a ‘clean’ industrial application and any others.

The tower drift eliminators must be removed and all parts of the system must be safely accessible for cleaning purposes.

Whilst it is difficult and costly to remove the pack material on each occasion it must be inspected and confirmed in good condition and fit for purpose. Sections of packing may be removed and examined.

Access platforms should be provided by site to enable safe and effective access to all parts of the tower structure.

If on-line chlorination / bromination is utilised as part of the routine water treatment regime cleaning of the tower internals is still considered best practice.

Problems arise with continually operated systems where downtime of the cooling system is minimal. A risk assessment must be carried out on the regime and plant to ascertain if the control measures are sufficient. However, best practice would be to physically clean and inspect all parts of the plant as specified by the HSE ACOP L8.

The method employed is clearly laid out in HSE ACOP L8 especially with regard to pre and post chlorination contact times and the effect of ph on chlorine residuals.

Depending on the outcome of the site risk assessment, we would strongly recommend the annual cleaning and chlorination of all cold water tank installations, with the inclusion of the hot and cold outlets if permissible.

Hot water calorifiers should be annually inspected and cleaned as part of the domestic services chlorination (if possible).

Renovation Cleaning

If dynamic flushing cannot be carried out we can provide a wide range of side stream filters and chemical dispersants to achieve an acceptable trouble free system

MA Solutions series of cyclone filtration systems are designed for side stream filtration of closed circuit water systems for removal of suspended solids and sludge.

A side stream flow of water, drawn from the system by the circulation pump built into the unit is pumped through the cyclone filter where suspended solids or sediment are separated by centrifugal force. The cleaned filtered water is then returned to the system. Suspended solids collected in the filter are periodically purged to drain manually or automatically with minimal water loss.

Filtration of closed water systems to continuously remove suspended solids will protect control valves and sensitive equipment from damage and blockages whilst maintaining system efficiency and performance.

Recommended especially for:

  • Heating and chilled water systems
  • Fan coil systems with multiport modulating control valves
  • Versatemp or similar systems incorporating heat pump units
  • Systems with plate heat exchangers
  • Old systems being renovated or upgraded and fitted with replacement boilers etc.
  • Glycol and brine systems

Features & Benefits of Side Stream Filtration

  • Continuous filtration with no backwashing or flushing required.
  • Minimum water lost during purging - closed recovery system provides zero water loss.
  • Suitable for wide range of temperatures and pressures, including high temperature hot water, chilled water systems easily installed to existing systems.
  • Independent of system operation and flow.

Compact sized unit complete with pump and controls provides a high flow filtration system with minimal space requirement. Readily manhandled into position with no site assembly or lifting equipment required.

The units will remove metal oxides, precipitated hardness salts and other separable solids down to less than 20 micron on continuous recirculation. These units can be hired for any duration.

MA Solutions has the technical experience and product range to facilitate all types of cleaning works.

Pre-Commission Cleaning

Many of the problems associated with Heating and Chilled Water Systems are due to corrosion of pipework and fittings, or to deposits introduced into the systems during the period of construction.

The Pre-Commission Cleaning operation is designed to remove unwanted contaminants from the pipework installation. If allowed to remain within the system, these contaminants will make the system prone to blockages at strainers, control valves and within small bore heat exchangers. They may also assist in promoting corrosion and microbiological activity within the system.

We normally specify a three stage cleaning operation based on water flush with measured velocities to ensure the complete removal of loose debris, followed by a chemical clean to loosen and dissolve surface oxides. A final flush and passivation will conclude the operation.

There is potential for a chemical clean to do more harm than good if it is not carried out correctly, in particular, the success is dependant upon being able to carry out thorough flushing of the system at all stages of the work. The clean must be carried out as one continuous operation, without any undue delay, this will prevent further corrosion developing.

As the success of the operation relies mainly on the quality of the flushing, and to carry out flushing correctly, valve manipulation is necessary. Unrestricted access to all parts of the system is required throughout the operation.

Pre-Connection Sterilisation

This is required for all multi occupancy dwellings. It must be carried out in accordance with BS6700 / BS8558. The disinfection of tanks together with hot and cold down services supplies is strongly recommended.

We have the technical expertise and product range to facilitate pre-commisssion cleaning on all types of systems in accordance with CIBSE and BSIRA guidelines.

Please send us your drawings and specifications by email and we will quote you to undertake this work.