Dry and Wet Riser
Dry and Wet Rising mains are designed for use by the fire brigade and other trained personnel. They provide a readily available means of delivering considerable quantities of water to extinguish of to prevent the spread of fire.
Under BS 9990-2006 dry and wet risers should be visually inspected every six months and serviced annually.
Working to this standard, Advanced Firetec can provide a responsive national service, supplying a full range of products for new and existing systems. Servicing is arranged around times convenient to the customer, with minimum disruption to the working environment. All service work is carried out on line with building's fire risk assessment and fire certificate.
Risers, Hydrants
TEST PROCEDURE FOR DRY RISING MAINS
e test ensures that the dry riser systems are in satisfactory condition so that all equipment is ready for immediate use in accordance with British Standard 9990: 2006. Testing and inspection of dry risers shall be carried out every six months.
The Advanced Firetec Ltd service engineer will be accompanied on the premises by a responsible representative for the site if convenient, whilst carrying out a physical check of the dry rising mains.
This includes:
- Checking all valves open and close (leave closed, strap and lock).
- Replacing all outlet instantaneous washers.
- Replacing all damaged or missing blank caps and chains.
- Checking that all hand wheels and nuts are undamaged and in place.
- Checking landing instantaneous outlets are free moving and undamaged.
- Checking the air release valve and replacing if necessary.
- Checking the inlet cabinet and door for corrosion.
- Checking that the inlet breaching valve springs, and that the rubbers are free moving and in good condition.
- Checking the glazing and sign in the door.
- Removing any rubbish from the inlet box.
- Lightly lubricating all moving parts.
Static Pressure Test (Annually)
On the completion of inspecting the system, water will be allowed to flow through for at least five minutes, discharging via the topmost outlet flushing out any debris that may be present (if possible). The system will then be completely charged with water to a pressure of 3 bar (measured at the inlet) and all landing valves will be checked for leakage, and auto purge will be checked for valve operation. Should this valve be found to be faulty, every attempt would be made to fit a new valve at time of test. The pressure will then be increased to 10 bar (measured at inlet) for a period of 15 minutes. During this time a further inspection of the system will be made to check for leakage of water joints and landing valves. When the landing valve is replaced all of these checks should be completed.
Flow Test
On completion of the static pressure test a flow test will be carried out. Water will be passed through the system under pressure for a period of no less than 5 minutes and flow gauge readings recorded on the Test Certificate. If unable to sustain an effective jet from the topmost outlet or if there is any undue pressure loss in the rising main (after allowing for height involved) an investigation will take place.
Putting Into Operational Readiness
When the pressure has been released at the pumping appliance, the coupling to the rising main inlet will be disconnected and the action of the non-return valves checked. The system will then be drained and left ready for use.
Remedial Action & Re-Test
If after these tests any defects are found which are impossible to rectify immediately, then the faulty valve will be padlocked down with an 'Out of Order' notice attached to the valve in a prominent position.
A full report will be given in writing within 7 days of the inspection to the client stating that work required to reinstate the dry riser system back to full operation, this includes all materials required and the cost of fitting, together with an estimate of time to complete the repair and the date in which the repair will commence. When work is completed then a full re-test of the system will be carried out as specified.
Certification
The Advanced Firetec Ltd service engineer will issue a certificate confirming the satisfactory performance of the installation.