Technical guides
Notes on Specifying Drainage
Reference pages on the standards, dimensions and terminology that drainage schedules are written in. No sales copy — the product pages do that job.
Reference
Guides
Written from the standards and from the drawings behind our own range. More are in preparation.
Standards
EN 124 Load Classes, A15 to F900
What each class means, the test load behind it, and how the class is chosen from the location rather than the product.
Read the guide →Specification
Clear Opening, Frame Outer and Frame Depth
Three dimensions describe every cover and frame, they are routinely confused, and the number in the model name is usually none of them.
Read the guide →Standards
EN 1433 vs EN 124 for Channel Drainage
Which standard applies to linear drainage depends on what is manufactured, not where it ends up — and clear waterway is not the channel width.
Read the guide →Materials
Ductile Iron vs Grey Cast Iron
Both are cast iron; the graphite shape separates them. How to read EN-GJS-500-7, and why “cast iron to EN 124” does not guarantee ductile.
Read the guide →Specification
Double Triangular Covers and GRP Sealing Plates
Two hand-liftable castings in one frame, a sealing plate beneath — why sealed access is the norm on GCC sewer networks, and the range we publish.
Read the guide →