Steel-Laminated Rubber Flange: Recommendation

Technical Drawings for Coupling Systems

Steel-Laminated Rubber Flange

The steel-laminated rubber flange is a special design patented by E+S which has been in use for more than 20 years now and has become a typical trade mark of E+S hose construction. Due to continued improvements of the original design, this flange type achieves a high reliability, especially in transmitting high tensile forces. In comparison to built-in steel nipples, this flange disposes of a higher flexibility and less weight of hoses in comp. to hoses with built-in steel nipple and is therefore suitable for most operations.

Rubber flanges must always be mounted against fixed, smooth-faced pipe flanges. Rubber flanges are made in various shapes so that the outer diameter may be greater than necessary. After vulcanising, all the hose flanges are drilled so that the bolt holes at either end correspond exactly with each other.

Additional gaskets must not be used!
Torque up bolts as per steel flange recommendation.
Don't use necked-down bolts.

Steel-Laminated Rubber Flange – Coupling – No. 1


A larger pitch circle diameter for the bolt holes is required for armoured hoses and for heavy duty delivery hoses which have an extra thick rubber lining.

During assembly, bolts should be inserted from the hose side with the nut behind the pipe flange. This is because:

1. Wrenches may be used on the nut on the pipe side, thus avoiding damage to the hose.

2. If bolts have to be burnt off, this is nearly always done at the nut ends. Hose quickly burns beyond repair.

Steel-Laminated Rubber Flange – Coupling – No. 1

Reference numbers accompanying E+S quotations have this pattern: a/b x c x d x e/f

Each group of figures signifies:

a. (The first group before the oblique stroke): outer diameter of the hose immediately behind the flanges.

b. Minimum overall diameter of the flanges.

c. Pitch circle diameter for the bolts.

d. Number of bolt holes.

e. Diameter of bolt holes.

f. (After second oblique stroke): total thickness of hose flange.

Modifications to flange outer diameter 'b' orders are occasionally necessary for technical reasons. The flanges are made using a mould. If the required diameter is not available we reserve the right to undertake minor alterations.

Assembly Instructions

Steel-Laminated Rubber Flange – Coupling – No. 1

Rubber flanges must be mounted only against smooth steel flanges which are free from grooves and ridges. All bolts should be of the correct diameter and with sufficient thread to ensure secure grip. Washers are not required.

Each hole must have a bolt fitted. Ensure the bolts are tightened to the recommended torque's.
It is essential to check the torque on the bolts periodically.

Steel-Laminated Rubber Flange – Coupling – No. 1

When a rubber flange is secured to a loose flange an 'insert ring' must be incorporated.

Steel-Laminated Rubber Flange – Coupling – No. 1

Rubber flanges cannot be used on pipe flanges with a very small pitch circle diameter.