Shale shaker screens conductance will impact screen performance.

What is shale shaker screens conductance?

Conductance, measured in units of kilodarcies per millimetre (kD/mm), defines the ability with which a Newtonian fluid will flow through a unit area of shaker screen in a laminar flow regime, all other variables being equal. This allows any two screens that have been tested to be compared to identify which has the potential to process the highest flowrate per unit area. Conductance allows for screen comparisons regardless of other variables that may affect the actual flow capacity of a given screen in field use

So we know the high conductance will help us get high pass efficiency. Then we'll get better performance of whole shale shaker

Shaker screens conductance

NBA of shaker screens

NBA here means the non-blanked area on the screen panel. It describes the net unblocked area in square metres or square feet, available to permit the passage of fluid. Generally, more area is better. The NBA is known by using direct measurement and calculation techniques

The NBA calculation for pretnesioned or perforated panel-type screen is a bit different with open-hook strip screen panels. But they both request total panel screen calculation, average NBA of each panel screen.

Different configuration by shaker screen manufacturers

As different manufacturer hold special configuration of screen panel, the NBA and conductance vary much. API request a standard label on screen. Shaker screens conductance and NBA are necessary information listed there

Screen performance

Actually, per standard listed item including API Screen number D100 separation point, conductance, NBA, manufacture part number, place of origin.

Each unique or different combination of screen layers will lead different NBA also conductance. So we may find same screen dimension, same mesh, but from different manufacturers they will list different information

For example, original NOV Brand KING COBRA screen API 140 NBA is different with the replacement KC screen made by SWACO.

We see, both NBA and conductance play roles on the screen flow capacity or efficiency. If you'd like to know more, please contact Aipu solids control freely

Shaker screen NBA is the non-blanked area of shale shaker screen. It is a specification to evaluate screen efficiency or performance

How to calculate shaker screen NBA?

At professional laboratory, the screen non-blanked area will be estimated by measuring the area of each of rectangles, triangles, and trapezoids contained within the screen using a Fowler Sylvac Euro-Cal Mark III digital micrometer.

Total non-blanked area of screen panel is usually the accumulation on all punched hole internal area. Usually, when we certify or test shaker screen under API RP13C code we can request do the shaker screen NBA calculation or measuring

Shaker screen NBA

What impact screen non-blanked area?

The whole screen panel size will definitely the essential issue impacting screen NBA.

As we mentioned earlier, the NBA is from whole screen panel. So the punched hole size will impact general non-blanked area. For example, if the hole is rectangle one and may it is two times larger as triangle one. Thus is same panel size, we kindly suggest rectangle hole screen. Of course, the hexagonal hole will be better as well

If we use panels with same size and shape hole, the screen cloth wire diameter is another issue impact shaker screen NBA.For example, the thicker wire screen sized 60 mesh will definitely hold less exact NBA than thinner wire screen sized 60 mesh.

Non-blanked area unit

The NBA of shaker screen will be indicated as sq.ft or sq.m. Depends on different manufacturer, also depends on different test laboratory. So we usually find many screen manufacturer tell NBA in different way

For example, SWACO will describe Mongoose screen NBA as 5.37ft², while Derrick will tell NBA of PMD500 is 7.09 sq.ft. Aipu XC series screen configuration is holding average NBA as 0.5 sq.m almost 5 sq.ft.

Generally, if we use panel punched with same hole, the shaker screen NBA can be calculated per whole screen area. Please come to us with any problem of NBA. Also other question on shaker screens.