Maintenance

Maintenance on Rising Mains

 

   Competence of maintenance personnel.

• The services of a competent person should be obtained to carry out maintenance and repairs.

 

   DRY RISING MAINS

• Inlets, landing valves, drain valves, door hinges and locking arrangements to the inlet and landing valve boxes should be inspected every six months. Special attention should be given to all valves, spindles glands and washers to ensure that they are in satisfactory condition, so that all equipment is ready for immediate use.

• In addition, it is recommended that wet tests be carried out annually when the main can be checked for leaks.

 

   Wet Rising mains

• Maintenance of wet rising mains involves additional checks from those mentioned above. These additional checks are:

a) Check on the cleanliness of storage tanks;

b) Thorough check of the booster pumps and their associated mechanical and electrical equipment.

 

   Removal of valve assemblies for replacement

• Where outlets on either dry or wet rising mains are found to be defective and no replacement is immediately available, the whole valve assembly should be removed from the main and be replaced with a blanking off plate or plug in order that the system remains operative.