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Proper operation drilling fluid shear pump

2012-10-19

Preparation
A.Pump rotates freely by hand.
B.Check the pump rotate direction, the correct direction can be found by an arrow on the casing. C.Open the suction valve fully.
D.Pump and suction line full of fluid for venting air.

Operation for running
Start the motor after finishing all the preparations.
Lubrication
A Bearings lubrication
a Add a good grade of 10w30 weight motor oil until the middle level of dipstick. Do not overfill the oil. High levels nay cause churning and overheating of the bearings. Oil should be changed every 90 days or 1000 hours.
b Under the special condition, you may select a grease which can dissolve with the motor oil for lubrication.
B Stuffing box lubrication
a The stuffing box may be re-lubricated with grease as often as necessary to prevent the packing form overheating. It should be lubricated at least once a day.
b On filling, grease should be pumped into the box while turning the shaft until it comes out around the packing gland.
C Disassembly:
Remove the pulley kit.
a Remove the Pressing board.
Remove the pump case.
b Remove impeller ,shear plate and Strengthening board:Screw the left-hanged nuts off use a wrench(Restrain the shaft at the pulley end to prevent rotation, If you do not have a wrench). Put a block of wood against the ribs of turbine and hit the wooden block with a hammer to withdraw the impeller.
c Remove reinforce sleeve and mechanical seal.
d Withdraw protecting boar and stuffing box.
e Remove the shaft sleeve. A wedge may be driven between the end of the sleeve and the shoulder of the shaft to free the sleeve.
f Remove the blocking mud ring.
g Remove left right cover.
h Pull the complete shaft and bearing subassembly from the frame.
i Remove the lock nut and the lock-washer.
g Remove the bearing frame and bearings from the shaft.
Note: Impacting of the entire shaft assembly against a board on the ground will remove the bearing assembly.
k The bearing may now be pressed off the shaft.
Note: A piece of 3standard wall pipe slipped over the shaft and impacted against the inner race of the bearing works exceptionally well.
D Inspection
a Impeller:Replace if the impeller shows excessive erosion, corrosion, extreme wear, or vane breakage.
b Shaft: Check for run-out to see that the shaft has not been bent. If run-out exceeds 0.05mm, replace the shaft. Bearing seats and oil seal area must be smooth and free of scratches or grooves. Shaft threads must be in good condition. Replace shaft, if necessary.
c Shaft sleeve: Sleeve surface in the stuffing box must be smooth and free of grooves. If grooved, replace it.
d Oil seal: The removed oil seal must be replaced.
e Ball bearings: Replace if worn, loose, or rough and noisy when rotated. New bearings should not be unwrapped until ready for use replacement bearings must be of the proper size and type as supplied with the original equipment.
f Seal O-ring: It is recommended that all O-ring and gasket seals should be removed during disassembly and replaced. In those cases ones can be reused if they are not worn or otherwise damaged.
E Assembly
a All parts should be clean before assembly. This is especially important for O-ring grooves, threads, gasket surfaces, bearings and bearings surfaces. Any burrs should be removed with crocus cloth.
b Firstly slip the bearings onto the shaft. The two bearings are to be mounted back-to-back (that is, the sides of the bearings with the manufacturer’s name and the bearing number are placed together), with lock-washer in place tighten locknut with the bevel positioned against the bearings tighten the locknut to 346M/1N of torque. Then, put the shaft with bearings into the frame from left and slip the bearing onto the shaft from right of frame.
c The sleeved area of the shaft must be lightly coated with anti-seized compound before installing the sleeve.
d Install the impeller. The clearance between the back of impeller and protecting plate is 0.6mm.
e With the packing gland in position, swing the gland bolts into place. Initially tighten the gland hard to compress the packing. Then back off the gland bolts and retighten only finger tight.
Caution: Tighten the gland against the packing finger tight only If packing is over-tightened it may be burned when the pump is started.
Assembly can be processed as the opposite sequence of disassembly. The pump rotates frees by hand after assembly. If not free, adjust the shaft assembly by loosening or tightening the bolt nut.