Shaker screen sizes don't mean screen panel dimension, but also the screen mesh size or API number.
Shaker screen sizes of different shaker
Different shale shaker will be fit with different sized shaker screens. "shaker screen sizes" herein mean the screen panel dimension. Including the length, width, and the panel overall height or thickness
For example, Derrick PMD 48X30 shaker screen sized 41.125" x 27.5" with about 28mm overall height, but, the side hook height is about 4/5". One more sample, the King Cobra series shaker screen, presently almost overall height is about 28mm, the frame length is 49.25" x 25".
Various of shakers fit different quantity and size screens. Even they have same or similar model number their screens will be dramatically different. Take NOV Brandt 4x3 and SWECO 4x3 shaker. Their screen deck will be installed with different sized screen panel
And another special situation is one shaker will hold different shaker screens. Such as NOV Brandt VSM100, VSM300 shale shaker, KEMTRON KTL-48-Tango, and so on.
Shaker screen mesh sizes and configuration
Shaker screen sizes of opening and configuration are rather relative. We know some shaker screen mesh size are not conform with API RP13C, they will call that as market grade mesh or screen configuration.
The shaker screen configuration lead shaker screen mesh size or API number. For example, we can combine the 80 mesh screen cloth woven by 0.03mm wire, 15mesh screen cloth with 0.2mm. We also can configure 250x100mesh with 0.006mm, 150x70mesh with 0.015mm, 70x30 with 0.03mm. These configuration won't be described as API 200 or etc. before being tested or certified by API test center.
And no matter how we configure screen cloth, there must be blanked area as the different wire mesh layers will cover each other disorderly. So different configuration will result different character or features. For example, the rectangular holes combination will provide better conductance. And the mixture configuration will provide both conductance and durable life. If we prefer or focus on only one feature we can inquire supplier or manufacturer for optimal solution