Is there any ponding or standing water near the base of the hydrant. If the main valve fails, there is no other valve inside the building that will allow you to shut the water, and repair that failed valve. All valves used in sa water s infrastructure network must be ordered. Procedures for preventative maintenance treatment of. Every home has a main shutoff, which will cut the water supply to the entire house. Water distribution line repairs should be documented, especially when there. The valve should function freely with no binding or.
Ensure that the valve is installed with the direction of flow arrows pointing in the correct direction. Water vents model 77, 78, 79 xylem applied water systems. The valve incorporates the pressure reducer, strainer, expansion valve and check valve. Valve exercising program awwa recommended procedure the theory for this procedure is that you scrub or clean any debris from the gate or slides. Thats where the main water shutoff valve comes into play. Clow valve manufacturers of quality waterworks products. Maintain your valve exercising programs and associated logs. Replace damaged or missing caps immediately weep hole clear of dirt, debris, insects, sticks, etc. Published by the national environmental services center valve exercising summary every water system has valves devices that regulate, stop, or start the flow of water in the distribution lines. This training course series has been formulated in order to enhance capacity of community groups for enhanced operation and maintenance of water supply and sanitation systems in their villagetown. All pipes valves and fittings shall be rated for minimum 250 psi, wwp. A main water valve replacement is quite different, and more expensive, than replacing any other valve inside your building. These brands are available in various sizes, end configurations and operating pressures up to 2400 kpa24 barg 350psi.
Air management in water distribution systems a new understanding of air transfer in the late 1970s, a south african company began efforts to produce a pipeline air valve for market. Locating air valves along a force main lift station manhole pumps operating and line is full. If you skimp on maintenance, youll be faced with sudden failures and unexpected replacement costs. Its no secret that poorly maintained equipment doesnt last as long as it should. With the right materials and correct procedure, its a safe and easy repair. Prior to driving to the site, perform the necessary preplanning activities. Up to four 4 resources may be required on main arterial roads or busy intersections. Main water shutoff valves can become clogged with mineral deposits and grit, causing slow leaks. The citys valve is always located on the street side of your water meter, often near the edge of your yard. Reliability the ability of a valve to operate as expected when required is the biggest payback in a valve maintenance program. Preventative maintenance is pretty standard for pumps, but what about valves.
Page 2 preventive maintenance program guide for small public water systems using groundwater we cannot over emphasize the importance of keeping records and documenting maintenance activities. An interactive pdf with suggested preventive maintenance tasks and logs. Tighten the packing gland to the appropriate torque for the valve. Overview the normally open pneumatic control valve is held open by high pressure water force and requires air pressure to close. Since initiating its valve program, cudrc has stopped using the maintenance trailer to exercise 2inch valves. The manufacturer tests each valve according to specifications as detailed in api 6d or similar standard then issues a performance certificate. Understanding some simple principals of gate valve operation, and how to maintain this device, should be standard knowledge for a homeowner. The technical committee on inspection, testing, and maintenance of water based protection systems notes the following errors in the 2017 edition of nfpa 25, standard for the inspection, testing, and maintenance of water based fire protection systems. In addition, most newer homes have individual fixture. Maintain logs of water main and service line repairs. The valve seat on the other hand is made of two pieces. Plan also involves a checklist for operation, supervision and maintenance. With a nozzlecap or pumpercap removed, and using a listening device, does the main valve leak.
At the mcwane family of companies, we make the pipes, valves, fire hydrants and fittings that together build our nations water infrastructure. Any part used in connection with water supply, distribution, measurement, controlling, use and. Usually the same system map is used for the valve and hydrant maintenance programs. Adjust the main valve to make sure its closed tightly and there are no leaks replace the caps and tighten them so that they can be. Pocket guide to inspecting, testing and maintaining. For typical city dwellings, there are actually two main shutoff valves. Valve inspection, exercising, and maintenance city of flint valve. Remove the valve from the system and place it securely in a vice. No other valves should be placed between the cold water combination valve and the. Procedures for preventative maintenance treatment of pipeline ball valves in natural gas pipelines background pipeline ball valves are produced by a variety of manufacturers around the world. For pump station and treatment plant applications bfv. If the pipeline and valve are tested with water prior to gasair tests, ensure that the pipeline and valve are. Standard for the inspection, testing, and maintenance of.
Operation and maintenance inspections and flushing at least annually more often for valves that operate. Since a center stem compression fire hydrant is a normally closed valve, flushing without the restraint of the operating nut assembly will allow flow to drive the main valve closed. Operate the stem in the opening direction several turns. A guide to control valve selection, maintenance, and. Insert valves for water distribution systems hydrastop. Understandably, it wanted to introduce something that was competitive, and that, hopefully, would outperform those valves that already existed on. Various types and automatic systems there are different types of water shutoff valves.
Be sure to schedule leaking or damaged valves for repair. Fire hydrant maintenance during a static pressure test, do any of the nozzles, gaskets, or drainage holes indicate leakage. If your main water valve fails, you will require a main water valve replacement. Crews now operate those by hand, along with butterfly valves, which can be a little more sensitive. Understanding some simple principals of gate valve operation, and how to maintain this device, should be. Then, well take an indepth look at the whys and hows of control valve maintenance and repair. Sop331 valve inspection, exercising, and maintenance final. Therefore, use a control valve that has the feature to adjust flow by opening the bypass valve. Chapter 9 contains information on control valve standards and approval agencies across the world.
The valve guard, poppets, springs and wear shims are conventional. Inspecting quality of materials pipes, joints, chlorine and performance of equipment water. Operation and maintenance of water distribution systems pseau. How to begin a fire hydrant operation and maintenance. Practical guidelines for operation and maintenance of water distribution. The same level of care and caution is recommended in dealing with the maintenance of said valve, and there are steps that you could take if you want to make sure that your gate valve is functioning as best as it should, all. Chapter 8 details typical control valve installation and maintenance procedures. Preventive maintenance for small public water systems. Relief valve maintenance items to check during inspection. Being able to operate these valves at a moments notice is extremely important. When a hydrant is partially disassembled the main valve will generally fall to the open position.
Butterfly valves for water works applications a summary of design, applications, and maintenance general butterfly valves bfv are commonly used in water transmission and distribution for sizes 12 and larger. There are two main types of saunders valve body types. Valves manufacturer 04 how air enters pipe systems 05 why air is a problem 06 increases of head losses caused by air 07 importance of pipe profile 08 air removal 08 fundamentals of air valves 09 combination airvalves 10 air valve locations 11 air valves sizing 12 water hammer 15 the importance of anti water hammer air valves 16. If the valve gate is forced into the debris at the base of the valve it will be more difficult to open as the debris may become compacted under gate. Npt straight shank maximum operating pressure 50 psig 3. Weir type straight through type the diaphragm action can be actuated manually or with a pneumatic actuator the valve. Air valve basic training ohio water environment association. Selection, installation, field testing, and maintenance.
Operation and maintenance of water supply system training module for local water and. Pdf water distribution system operation researchgate. Proper water valve maintenance, and safe gate valve operation, may sound too technical and complicated for the average homeowner. Modify the water meter pit and replace corroded valves and fittings in incoming domestic water main meter pit demolish existing water meter pit. We found out more often than not we ended up breaking the stem, wood says. Use manual bypass lines to ensure system remains in. Testing and maintenance for valves in water works applications. The insertion valve is permanently installed on top of the pipe, allowing for system control and maintenance in the same manner as a resilient seated gate valve insertion valves allow utilities to perform maintenance without shutting down large portions of their water distribution systems.
Improperuneconomical diameter of sluice valves, column pipe, drop. Chapter 10 identifies isolation valves and actuators. Check direction hole is pointed corrosion if relief valve spring coating is cracked or chipped, replace the valve physical damage if there are any indications of damage, replace the valve. If the water flo w cannot be stopped, schedule repair of the isolation valve. If you get drips of water coming through your pipes even with the main shutoff valve completely closed, its probably time. Consistent forms and checklists help to ensure that you inspect and evaluate the same points each time. Preventative maintenance for valves crane engineering. Saunders valves are ideal for restrictive or flow control duties ie valve half closed to reduce flowrate. Correct selection will result in ease of operation and maintenance and ensure the valves achieve the required economic life span of 50 years. When the air supply is interrupted, the valve stem remains in the open position and does not seal the valve seat, allowing the release of stored water. Shut down and drain the main in the area of the valve.