Selecting proper gate valves and pipe
Selecting proper gate valves and pipe
(OP)
I am working in St. Marc Haiti on community development projects. The city water system here has many problems. One of which is old valves. If I were to import gate 2", 4", 6", 8" and 10" NRS gate valves, to be used on SCH 40 pipe. What should I be considering? A game played here is to used inferior valves. If local government wanted to specify an adequate valve, what would anyone suggest? What about blending c200 into a sch40 system. We are going to have to go under a large creek 8-18 meters wide prone to flooding. I thought working with gasketed pipe would be better choice, although c200 is not available here and would have to be imported.





RE: Selecting proper gate valves and pipe
Recommend AWWA C500 valves
double disc parallel seat type
Manufacturer should provide certification that they have manufactured valves for a minimum of ten years
Each valve should have manufacturer's name, pressure rating and year in which manufactured cast on body. This will help prevent the old bait and switch. Spec out several acceptable manufacturers / models with no substitutions allowed.
Prior to shipment from the factory, each valve should be hydrostatically shell tested (400 psi) and hydrostatically seat tested (200 psi). Require submittal of the test results for your shipment.
Gates should be high strength cast iron.
RE: Selecting proper gate valves and pipe
RE: Selecting proper gate valves and pipe
plug the ends of the sleeve to prevent water and sediment from getting in. Cleanouts shouldn't be necessary.
recommend you check out the Clow or Mueller website
http://www.clowvalve.com/awwa.htm
http://www.muellercompany.com/test/mueller_water/water_product.php?catn=17&cat=Gate%20Valves
RE: Selecting proper gate valves and pipe
RE: Selecting proper gate valves and pipe
>
> We are considering purchasing either a Grundfos 800S750-3A 75hp, or Grundfos 800S600-3AA 60hp with a Furnas Pump panel sz 3.5.
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> These pumps are to be installed in Gonaives Haiti,the area of Haiti subject to recent horrible flooding. The electricity is highly unstable and many pumps fail from lack of adequate circuit protection. What is the best panel for these pumps? It must protect high and low> voltage on all three phases and sense thermal problems. Are there any super-excellent panels which can protect pumps from the worse electrical current in the world? The panel most be idiot proof. The operator is responsible to push the button. The panel could even have a timer to prevent multiple pushing when there is a problem.
>
Please compare Grundfos and Goulds pumps for durability in adverse conditions. The Grundfos would come from a firm in California (far away) assembling the pump on a discount for us. The Goulds would be straight market price out of Florida (closer to Haiti).
RE: Selecting proper gate valves and pipe
RE: Selecting proper gate valves and pipe
RE: Selecting proper gate valves and pipe
At a minimum I would request a phase monitor in the panel. It will check and compare voltage on all legs and disable the pump should the voltage be out of settings. Thermal protection can be incorporated if an option with the motor.
RE: Selecting proper gate valves and pipe
I spent about a week in Haiti several years ago. The only thing less dependable than the electricity was the phone service. If a stormwater pump is needed, I'd suggest a motor driven pump. Voltage in Haiti is so erratic that I think a voltage/phase monitor would keep the thing from running at all. I also have some doubt about the type of power. I would be surprised if three phase is available. This seriously reduces the number of choices in the 60 to 75 HP range.
RE: Selecting proper gate valves and pipe
Are American Flow Control 2500 resiliant wedge valves a good selection if they most stand up to daily use? Should I upgrade the order?
RE: Selecting proper gate valves and pipe
It sounds as if you have an adequate, but probably very unpredictable, power supply. I would suggest having either Gould or Grundfos supply the control panels. They can both do this. This makes warranty claims a lot easier; although, I'm not sure how much of a warranty you can get in Haiti. You will need to tell them exactly what triggers a "Pump On" and "Pump Off" situation. With relays and a bit of magic they should be able to provide a panel which shuts down when the voltage high or low and automatically returns to service when the power is stable. If they can't or won't, let me know and I'll direct you to someone who can.
Good luck to you. I would be glad to contact you directly by email but, unfortunately, posting addresses on the forum is discouraged.
RE: Selecting proper gate valves and pipe