Detalhes do produto:
Function: Axial restraint / end thrust restraint (not a seal)
System: EN 877_2021 / SML cast iron drainage pipes, used with a matching coupling
Material: AISI 304 or AISI 316 stainless steel to EN 10088-1
Construction: One-piece formed, bent, no welded seams
Size range: DN 50 – DN 300
Corrosion class: K2 from 72 h salt spray; K1 (≥ 350 h) available
What is a grip collar?
Under EN 877 , a grip collar is a component of the manufacturer's drainage system that secures joints in discharge systems subject to internal pressure by providing axial restraint against the end thrust at changes of direction, blank ends and similar positions. Some joints incorporate the restraint device themselves. Where they do, the joint has to satisfy the requirements for both a standard joint and a grip collar.
End thrust is highest where the flow changes direction or stops. At a bend, pressure acts on the projected area of the bore; at a capped end, on the full bore area. A standard push-fit coupling is designed to seal, not to carry that axial load — above its pressure rating the pipe ends can slide out of the sleeve even though the gasket is still intact. A grip collar takes the axial load mechanically, so the seal is never asked to hold the pipeline together.
A grip collar does not seal. Watertightness remains the job of the coupling and its gasket. The collar is the mechanical lock that keeps the sealed joint in place.
Why DINSEN: one-piece formed, bent not welded
- No welded seams
- Corrosion resistance from the grade, not from a coating
- Controlled geometry, controlled axial grip
- Declared materials, traceable supply
Frequently asked questions
1. Is a grip collar a seal?
No. A grip collar provides axial restraint only. Watertightness is provided by the coupling and its gasket. The collar is the mechanical lock that stops a correctly sealed joint from pulling apart under end thrust.
2. 304 or 316 — which should I specify?
304 covers standard indoor building drainage. 316 contains molybdenum and offers higher resistance to pitting in chloride-bearing environments — coastal projects, buried installations, de-icing salt exposure or aggressive industrial effluent.
3. Why one-piece formed instead of welded?
A weld creates a heat-affected zone and a surface discontinuity in the most highly loaded part of the collar, and any coating over it is a potential failure point. Forming and bending a single piece gives consistent geometry and consistent axial grip, with no seam to inspect or protect.
4. What documents are supplied?
A declaration of the material of every part, the salt spray test report for the corrosion class ordered, and EN 10204 inspection documents on request. Tell us which certificate type your project requires when you enquire.
5. What information do you need for a quotation?
DN and quantity, coupling type, fitting type and bend angle, design pressure, material grade, corrosion class, certificate requirement and destination port. Drawings or an isometric sketch help us match the collar envelope to your fittings
Get the right grip collar for your line
Send us your DN, grip collar stainless steelgrip, fitting angle and design pressure. We will reply with the matching dimensioned drawing, the material declaration and a quotation.
Email: info@dinsenpipe.com Web: www.dinsenclamps.com
