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Metengr: Can you direct me to where I could find a sample of such a procedure - or guidelines to get an idea of the matters to keep in mind. I assume one critical factor is safety of the welder from electrical shock. A leaking pipe means that the ground on which he is working is damp - probably...

Greetings all. We are doing some maintenance on a major water pipeline in our Agri-business. This requires welding a steel plate to "patch" a leak. As the repairs are being done, water is being transferred through the pipe. Will this seriously affect the weld penetration? Will the weld be less...

Thanks BigInch. Sort of what I expected, in my ignorance. Stanier: All I ask is the opportunity to gain understanding and knowledge. I'm not attempting to be an expert, or to make decisions on the matter. The stimulating discussions and ideas are useful to me. At least I get the opportunity to...

Submersibles and Delivery Pumps at 1450rpm Submersibles to Delivery Pumps has dH of 12m Delivery pumps to downstream reservoir dH of 48m Certainly check valves btw. delivery pumps and manifold. Not 100% sure if there are check valves between subs and deliveries. We're busy upgrading, so could...

BigInch, To start with, submersibles will push water out of a river to our delivery pump station, and delivery pumps from here to one of our dams. Submersibles: 3 operate in parallel. (Figures below per pump) dP = 200kPa Q = 868 m3/hr P = 57.7 kW Delivery Pump Specs: 3 operate in...

Thanks Shozza. Very interesting, I'll look into it.

Compositepro: The pumps I'm using are centrifugal. I had very much doubted that there would be any significant reduction in speed on sudden shut down, but others that I was talking to weren't so sure, and hence the question. Stanier: I agree that numbers are essential. However, there is some...

Thanks for that. We will definitely have check valves on all pump outlets. We will also be operating with VSD's in starting and stopping. The problem comes in when we have a sudden power failure, which happens all too often in South Africa unfortunately. In the case of sudden loss of power, and...

I would like to know what the effects would be if a pump had to suddenly be stopped due to, for example, a power failure. Is there significant risk of water hammer? What measures are recommended for preventing water hammer? In my specific situation, I will be running 3 pumps, sucking and...

Hi To me this specification seems contradictory - "Std Bore" and "Full Port" refer to the same thing, but indicate a different requirement. Furthermore, API 6D is a dimensional specification, and if this is requested, it should be adhered to. Possibly the customer requested a valve and...

A Pressure Reducing Valve is used to obtain a desired downstream pressure. The valve is adjusted with that goal in mind. The fact that a valve is adjustable does not necessarily make it a PRV. A balancing valve might be used to balance the flow in a circuit to a desired flow rate. They are not...

Thanks for the responses. I don't know offhand the impeller design, but I'll find out. I checked out some pump curves, and you're quite right. A likely cause.

Recently I was conducting tests on a centrifugal borehole pump. When the pump was started up under no head (i.e. the pump was run without any connections other than the riser pipe) it would run without problems. As soon as the delivery pipework was connected up, the pump would trip on...