Introduction: Matching an 890 x 686 x 73 mm screen to a VSM300 primary deck depends on the deck opening, frame depth, edge profile, and mesh already in service.
The frame must drop into the rails, seal at the edges, and stay locked under a full mud return. The mesh decides what the screen separates. Both must be right before price or any other comparison matters.
The 890x686x73mm fit on a VSM300 primary deck
The three dimensions do separate jobs. The 890 mm and 686 mm define the footprint across the deck opening. The 73 mm is the frame depth that carries the screen into the deck structure. On a VSM300, the primary deck is the first screening stage, so it receives the full mud return from the flowline before any solids are removed. Screens in that position sit under the heaviest solids load. That is why the frame depth and edge must land exactly where the deck hardware expects them. A frame that is slightly too shallow will not lock down; one that is slightly too deep will not seat against the seal. A rig-side fit check takes a few minutes and prevents a wasted shipment. A solids control engineer measures the deck opening length and width, checks the frame edge profile and corner clearance against the rail or wedge system, confirms the frame depth at the sealing surface, and records the mesh designation already running on that deck. Those four notes — opening size, edge shape, depth, and current mesh — give a supplier what it is worth checking that an 890 x 686 x 73 mm screen is the correct part. Measure the deck you are actually replacing on. A screen measured on another deck position or another shaker can look close on paper and still fail during installation. This size belongs to the VSM300 primary deck position. It is a replacement screen built for that deck, not a universal screen that carries across shaker brands or across primary, secondary, and lower deck positions. The same footprint on another machine can sit behind a different frame edge, a different wedge arrangement, or a different frame depth. Using it there would require frame modification.
Reading mesh and cut point information for the same screen size
Once the frame fits, the mesh takes over. Cut point is the particle size at which roughly half the particles in the flow are small enough to pass through the screen while the rest are carried over the top. This is what the industry means by the d50 cut point. The API RP 13C designation system is how shaker screens are labeled against that idea. Two screens with identical box dimensions are still not the same product unless their cut point matches. The screen carries a claimed API RP 13C cut point designation. The available test text references API-120 and API-140, and both water-based (WBM) and oil-based (OBM) mud systems are covered. Confirm the mesh designation you plan to run against your mud program before ordering. Conductance is the other half of the decision. Conductance describes how easily fluid passes through a screen, which in practice sets how much volume that screen can handle. A finer mesh separates more solids but passes less fluid. A coarser mesh flows more freely and carries more solids over the deck. That trade-off is set by the mud program and the shaker, not by the frame dimensions. The 890 x 686 x 73 mm footprint tells you a screen will fit the deck; the API number tells you what happens to the mud that goes through it.
1. How to distinguish a true VSM300 primary deck replacement from a generic screen
A true replacement names the machine and the deck position, not just a box size. Look for the VSM300 and primary deck callout on the label or specification sheet, the 890 x 686 x 73 mm dimensions, and a description of the frame edge that matches the deck. Brandt and VSM300 are trademarks of NOV. A third-party screen should be presented plainly as a replacement part for that machine, not as an original part. For a generic 890 x 686 screen, verify the deck position and frame edge before ordering; those details determine whether it will lock and seal.
2. What mesh details should accompany a replacement screen inquiry
Include the mesh designation currently running on the primary deck, or the cut point you want if you are changing it. Add the mud type, whether WBM or OBM, the flow rate and solids loading you are screening, the number of screens per deck, and the quantity you plan to buy. A shaker screen manufacturer can quote against those details so the screen fits and separates the way the mud program needs. A primary screen supplier needs the same information to confirm the part instead of quoting only a box size.
Why frame structure and fitting points affect installation
The frame turns a mesh panel into a screen that survives a shaker. This one uses a single laser-cut steel sheet with laser-cut cross support, formed into the frame shape, with the pre-tensioned corrugated mesh bonded directly onto it. Because the main structure is one continuous piece, screens produced from the same tooling share the same overall geometry. That consistency supports predictable replacement: a screen from the same batch should follow the same fit. The fitting points are where screens most often go wrong in the field. The frame edge has to match the profile that sits against the rail or seal. The corners have to clear the deck hardware so the screen can drop in without being forced or hammered. The cross support and mounting surfaces have to line up with the locking or wedge points so the screen is held down evenly instead of being pinched at one end. Match all of that, and the screen sits flat and seals. Miss one, and it may install but rock, loosen, or let mud run around the edge. Weight also matters, because it affects how easy the deck is to handle and how the shaker carries the load. Published data for this screen lists 14 kg in one place and 15 kg in another. If a specific figure matters for handling or lift planning, ask for confirmation with your quote. For a wholesale shaker screens program running across several rigs, the frame choice is mainly about repeatability. Every pallet should arrive with the same dimensions, the same frame edge, and the same mesh designation.
Conclusion
Matching 890 x 686 x 73 mm screens to a VSM300 primary deck follows a short sequence: confirm the deck position, measure the opening and frame depth, check the frame edge and locking points, and state the mesh or cut point you currently run. Do that, and the screen that arrives seats the same way the last one did. PRM Drilling builds this VSM300 primary deck replacement screen as a manufacturer, and we quote directly from your deck details. Whether you are reordering from your existing VSM300 shaker screen supplier or comparing new ones, send the measurement notes, a photo of the frame edge, the mesh designation, mud type, and quantity. We will confirm fit and the mesh designations you ask about.
FAQ
Q：How do I know if an 890x686x73mm screen fits a VSM300 primary deck?
A：Start with the deck. Measure the opening length and width, check the frame depth at the sealing surface, and compare the frame edge and corner clearance against the rail or wedge hardware on the primary deck. If those points match the 890 x 686 x 73 mm screen and the deck is a VSM300 primary position, it is the right part. A screen measured on another deck position or another shaker brand can share the footprint and still fail to lock or seal.
Q：Which screen dimensions matter most when replacing a VSM300 primary deck screen?
A：All three matter, but they do different jobs. The 890 mm and 686 mm control whether the frame covers the deck opening. The 73 mm frame depth controls whether it seats and locks correctly. Frame edge profile and corner clearance are the two details that most often stop a nearly correct screen from installing, so measure those alongside the three main dimensions.
Q：What mesh information should I provide with the replacement screen size?
A：Give the mesh designation currently running on the primary deck, or the cut point you want if you are changing it. Add the mud type, the flow rate and solids loading, and the number of screens per deck. If the API number is not known, the existing screen label or a clear photo of it is enough for a supplier to work from when matching the same size.
Sources / References
Office of Weights and Measures | NIST
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