STS M-750H, Руководство оператора

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M-750H
Troubleshooting the M-750 Unit
The M-750 mixing unit is of a simple design with limited moving parts or consumable pieces.
The basic system works with a pump that draws fluid from a reservoir tank. The fluid then exits the pump
and by building pressure, and velocity, forces the fluid through the filter / shear and into the mixing Tee. The
fluid enters the mixing Tee through a nozzle and exists through a venturi. As the fluid enters the venturi, it
creates a vacuum in the mixing tee to aid in introducing the dry product from the hopper into the mixing Tee
and fluid stream. As the fluid passes through the venturi it carries the dry product with it and into the
reservoir tank.
As the fluid travels through the filter / shear, a set amount of fluid is taken from that fluid stream and forced
with pressure, to the jet gun inside the reservoir tank. The jet gun has multiple outlets that distribute the
fluid throughout the tank to “stir up the tank bottom.
The M-750 can discharge fluid to the drill rig or another reservoir by allowing some fluid from the filter
shear to be discharged and controlled by a valve.
A good rule to follow when troubleshooting is as follows
Everything before the pump is being sucked, “has vacuum".
Everything after the pump is being blown, “has pressure”.
The following, may aid in any problems that may arise.

No fluid flow/ low fluid flow
Pump not primed. - Prime pump
Suction valve is closed - Open suction valve
Suction valve is broken and not opening inside properly. - Replace valve
Plugged suction inlet inside of the tank. - Clean build-up inside of the tank
Not enough fluid in the tank or cavitation - Add fluid to tank
Impeller wore and gap to big. - Shim the impeller or remove gaskets
Pump speed to slow. - Speed up pump
Blockage in pump. - Remove blockage
Fluid too thick to pump. - Thin fluid by adding more water.
Filter / shear is plugged. - Clean filter shear

Fluid backs up into hopper
No fluid flow / low fluid flow - See above solutions
Large build-up in mixing Tee - Clean mixing Tee
Blockage in small part of venturi. - Remove blockage in venturi
Pump speed is set to low - Increase speed of the pump.
Mixing Tee suction port is open - Close off valve or cap (customer installed)

Dry product is slow or will not be drawn down through the hopper.
No fluid flow/ low fluid flow - See above solutions
Fluid is backing up into hopper - See above solutions
Dry product has lumps / debris blocking hopper valve - New product or clean valve
Hopper valve closed - Open hopper valve
Buildup in throat of mixing Tee - Clean throat of mixing Tee