ISO 3069
Centrifugal pumps — Dimensions of cavities for mechanical seals and for soft packing
Shaft cavity and seal chamber envelope for our standard cartridge and component seals.
Design Conformance to Industry Standards
Our product designs reference the following international standards. These references describe the technical specifications our seals are engineered against; they are not a claim of third-party certification.
DIN 24960
Mechanical seals — Principal dimensions, designation and material codes
Face and seat dimensions, sleeve interfaces, and material coding across the AS product range.
GB/T 6556
Mechanical seals for centrifugal pumps — Chinese national standard
Additional dimensional interchangeability for pumps built to GB shaft envelopes.
API 682
Pumps — Shaft sealing systems for centrifugal and rotary pumps
Design principles for our engineered cartridge seals for refinery and petrochemical service, including qualification testing philosophy and flush plan support.
API 692
Dry gas sealing systems for axial, centrifugal, rotary screw compressors and expanders
Tandem, double-opposed, and face-ring dry gas seal arrangements for compressors.
ASME BPVC Section VIII, Div. 1
Boiler & Pressure Vessel Code
Reference standard for our seal support system vessels (API Plan 52 / 53A / 53B / 53C).
Quality & Inspection Practices
The following practices are applied to production units before dispatch. Documentation packages (drawings, MTRs, test records) can be provided on request at the time of order.
Dimensional inspection
Every finished seal is dimensionally verified against the released drawing before shipment, with CMM inspection on critical face flatness, parallelism, and shaft-fit tolerances.
Material traceability
Face materials, springs, and metal components are lot-traced. Material test reports (MTRs / EN 10204 3.1 mill certs) are available on request at time of order.
Hydrostatic & seat testing
Cartridge assemblies are hydrostatically bench-tested to design pressure. Support system vessels are pressure-tested per the applicable code before dispatch.
Face flatness verification
Lapped seal faces are checked with optical flat and monochromatic light for flatness within one helium light band before assembly.
Reference Materials
Standard material grades used across the Astra product range. Custom grades are available for engineered orders.
| Component | Standard grades |
|---|---|
| Seal faces | Silicon Carbide (Sintered / Reaction Bonded), Tungsten Carbide (Ni/Co binder), Resin- and antimony-impregnated Carbon, Alumina (Al₂O₃) |
| Elastomers | NBR, EPDM, FKM (Viton), Aflas (FEPM), FFKM (Kalrez-equivalent), PTFE |
| Metal parts | AISI 304 / 316 / 316L, Duplex 2205, Hastelloy C-276, Alloy 20, Titanium Gr 2 |
| Springs | AISI 304 / 316L, Hastelloy C-276, Inconel 718 |
| Bellows | AM350, Inconel 718, Hastelloy C-276 (welded metal bellows); virgin PTFE |
Need documentation for an order?
We supply certified drawings, material test reports (EN 10204 3.1), and pressure-test records with your order. Ask for the documentation package when you request your quote.