Gas Safe Reg no 305929    Company No. 07980305    VAT No. GB172932986    D-U-N-S Number: 21-827-8135

Primary Coverage;    NW2 Willesden Green Cricklewood, Childs Hill    NW3 Hampstead, Belsize    NW5 Kentish Town, Camden    NW6 West Hampstead, Kilburn,

Queens Park    NW8 St Johns Wood    NW10 Kensal Rise, Harlesden, Willesden    NW11 Golders Green Hampstead Garden Suburb    W9 Maida Vale    W10 North Kensington, Queens Park    W11

* Commercial Gas Heating and Boilers * Legionella Inspections and Water Treatment. * PAT Testing. * System design and build; including plumbing, heating and gas sizing.* Boiler Repairs and Servicing.* Boiler Installation, G3 Cylinder Installation

* Heating System Servicing.* Mechanical Surveys.* Leak detection, tracing.

Micro Leaks


What is a Micro Leak? 


Have you got Heating and plumbing untraceable leaks? invisible tiny leaks? and pressure loss problems which cannot be diagnosed.

Your plumber may have told you, you have a micro leak but what is it, and what does this mean?


The term micro-leak when used by a plumber or heating engineer refers specifically to a leak which is so small it leaves no water deposits. The little water which comes from the leak does not deposit any faster than the naturally rate of evaporation so no water is left behind. Therefore there are no water stains or damage, and the leak generally goes unnoticed.


In hard water areas micro leaks leave a lime scale deposit behind. Larger crystals of lime deposits can be observed around pipe joints and valves. In extreme cases just a thin tiny powdery deposits is left extremely difficult to identify. In leaks a bit less micro, where there is a greater deposit of water streaks of lime scale can be seen running from the joints or fitting. Often the scale actually ends up sealing the joint though this is more common in low pressure and gravity systems.


Problems associated with Micro Leaks.


In sealed systems such as heating systems micro leak result in a slow and constant loss of pressure with no obvious cause. Pressure loss will eventually leak to boilers failing and indicating low system pressure, plumbers can be called out to top up the system at expense. Many systems have to be constantly topped up by heating engineers or the residents themselves sometime maybe once a year or every few months, other cases can be even more frequent especially in smaller systems with a lower total water content one leak makes a greater difference. 


Micro leaks are more likely to occur in heating and hot water pipes as the water is hotter so the rate of evaporation is faster.


Loss of pressure through micro leaks will result in closed system such as heating circuits and wet cooling circuits running on low pressure. This will reduce efficiency. Modern domestic boilers will activate a fault code when water pressure is low this protects the heat exchanger. 


Pressure loss in heating circuits can also but the result of pressure relief valves letting by. Have your heating engineer check this.


Plumbing Phrase: Micro Leak


The phrase "micro-leak" is a common term among plumbers and heating engineers The meaning is industry specif and will not be found in the dictionary. Etymology of this use unknown, it was used in a text book popular with apprentices and is something every qualified plumber would be familiar with, though it was in use well before this text book.


Any small loss of liquid or gas from any system could be referred to as a micro leak, but the description above it what is understood by the term when used by plumbers and heating engineers.


Jeff Culkin 


Culkin Plumbing and Heating.

Willesden Green


North West London

NW2 NW3 NW6 NW10 W9

Sign in|Report Abuse|Print Page|Powered By