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Drilling heart: mud pump - common faults and maintenance methods
Jun 26, 2017

First, the fault: bearing temperature is too high

Reason:

1. Bearing lubricating oil is insufficient or too dirty;

2. bearing wear or damage;

3. Wear of bearing and shaft.

Solution: 

1. Add or replace the oil;

2. Adjust or replace bearings;

3. Repair the journal or replace the bearing.


Second, the fault: the power side of the percussion

Reason: 

1. Cross head or skateboard gap is too large;

2. The bolt is loose at the crosshead;

3. Cross pin wear, the gap is too large;

4. connecting rod, cross head, drive shaft, crank shaft bearing wear;

5. Hydraulic side of the phenomenon of water hammer;

Solution: 

1. Check, adjust the crosshead or replace the damaged parts;

2. tighten the bolts;

3. Replace the cross pin;

4. replace the bearing;Improve inhalation performance;


Third, the failure: pressure gauge pressure drop, reduce the displacement or completely not liquid.

Reason: 

1. The water pipe is not tight, the air into the pump;

2. Inhalation of pipelines;

3. Cylinder or piston wear;

4. Valve body, seat, valve rubber was stabbed or falling off the valve stuck.

Solution:

1. Tighten the coupling flange bolts or replace the gasket;

2. stop the pump, remove debris;

3. Check, replace it;

4. Replace the damaged parts; remove the falling objects.


Fourth, the fault: the liquid discharge is not uniform, there are suddenly big impact, pressure fluctuations;

Cause: 

1. A piston or a valve is damaged;

2. Into the air into the pump cylinder.

Workaround: 

1. Replace the damaged parts;

2. Check the water pipe and valve assembly is tight.


Fifth, the fault: the liquid discharge is not uniform, the valve box hissing sound.

Reason: 

1.Valve box piercing

Solution: 

1. Welding or replacement valve box


Sixth, the fault: the valve box has a sharp percussion.

Reason:

1. Piston nut loose;

2. Cylinder loosening moves with the piston;

3. Inhalation is bad, resulting in water hammer.

Solution: 

1. Replace the loose ring, tighten the nut;

2. tighten the cylinder cap pressure cap;

3. Check or improve the suction line.


Seven, failure: the middle of the pump has a sharp knock.

Reason: loose rod clamp;

Solution: Tighten the clamp bolts


Eight, failure: leakage of liquid on both sides of the valve box.

Reason: 

1. Cylinder cap pressure cap loose;

2. The cylinder liner is damaged.

Solution: 

1. tighten the pressure cap;

2. Replace the gasket.


Nine, failure: cylinder head or bonnet seal at the leak.

Reason: 

1. Cylinder head or valve cover gland loose;

2. Seal is damaged.

Solution: 

1. Tighten the gland;

2. Replace the seal.


Ten, fault: leakage at the rod.

Cause: Seal is damaged;

Workaround: Replace the seal.


Eleven, failure: preload air bag does not enter the air or inflated soon after the leak.

Reason: 

1. Inflatable joints or preloaded air bag valves are blocked;

2. Air capsule damage;

3. The needle is damaged.

Solution: 

1. Clear the joints or valves in the debris;

2,Replace the capsule

3. Repair or replace the valve.