Acer W1800 Anleitung zur Fehlerbehebung PDF herunterladen (Seite 37)

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1. Cause: Pumping an extremely corrosive fluid;

usually high concentrations of hydrochloric

acid.

Solution: Determine the exact makeup of the fluid

being pumped. Check with Weir SPM for

metallurgy of valves and seats to determine

compatibility. It may be necessary to use

different materials.

H. Depressions in the seating surface of

the seat; many times referred to as

ball bearing indentions or marks.

1. Cause: Entrapped air in pumped fluid, particularly

viscous frac gels. Air bubbles trapped

between the valve and seat during closure

undergo explosive decompression when

the valve opens, causing the damage.

Solution: Review the suction conditions of the pump

and the fluids being pumped. It may be

necessary to slow pump or increase suction

pressure from auxiliary blender or feed

pump.

I. Valve seat jumps out of the pump deck.

1.Cause: Pump deck has not been properly cleaned

and prepared when changing out old valve

for new valve.

Solution: Remove old or worn valve seat using the

valve seat puller available through Weir SPM.

Clean the pump deck with solvent. Inspect

for any nicks or burrs. Take a piece of steel

wool and clean deck with circular motion.

Clean top to bottom. Take new seat and

clean any oil or grease from the taper.

Place seat in pump taper bore and drop

in place. Take an old valve body and place

in the newly installed seat. Strike firmly

on top of valve to "seat” the new valve

seat in place in the pump deck.

2. Cause: Pump deck worn "egg shaped" or eccentric

in the pump.

Solution: This is not a common occurrence but it does

happen. It is possible it can be repaired.

More than likely the cylinder will have to be

replaced and discarded. Check with Weir

SPM.

K. Insert jumps off the valve body.

1. Cause: Can be caused by poor suction conditions

and incorrect valve springs.

Solution: Check suction conditions to assure proper

filling of the pump. Check the strength of

the valve spring. A lighter or heavier spring

may be needed. Check with Weir SPM.

2. Cause: Material being pumped is too hot for the

valve insert elastomer.

Solution: Check specifications on the elastomer.

The standard polyurethane insert will

perform up to 180°F. Above 180°F, the

material will soften and depending on the

material being pumped and job length, the

insert will "dissolve" and disappear. Higher

temperature materials are available for long

and hot, high temperature jobs.

Acer W1800 Anleitung zur Fehlerbehebung Seite 37

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