BS EN 12928:2000 – Inserted flange type closure systems for steel drums with a total capacity of 17 l to 230 l
4 Dimensions
The dimensions of the octagonal base closure (ype CI) shall be as given in annexes BtoH. The dimensions of the serrated base closure (ype C2) shall be as given in annexes L, M, andN to S. . The nominal pitch diameter and the pitch of the thread of the closures G2 and G3/4 shall be in accordance with ISO 228-1:1994.
5 Materials
The materials of the various components of the closure shall be as given in annexes B to F and annexes L, M, N and O.
6 Design and construction
NOTE The nature of the internal and extermal sur face finish should be agreed between the purchaser and the supplier. If not specifed, the finish should be galvanized.
6.1 Flanges shall be of a mechanical inserted type and shall make a leak tight fit when inserted.
The flange base shall have either an octagonal base (type C1) or a serrated base (ype C2).
6.2 Plugs shall be designed so that they can be inserted and removed by means of a simple tool. The plugs shall have a wrenching insert projection welded to the bottom of the sump of the plug or have a wrenching device formned as part of the plug.
Dimensions of the wrenching insert shall be such that the plugs can be operated by a universal tool for steel and plastics plugs, e.g. as indicated in annexes I and R.
NOTE For recommended closing torques see annexes J and s.
6.3 Capseals/overseals shall be of a crimping type which can be ftted with a gasket for sealing and shall have provisions for customs sealing and evidence of tampering.
Capsealsloverseals shall be designed so that they can be removed by means of a simnple tol 6.4 Label rings and/or protection rings shall be designed so that they can be mechanically inserted simultaneously with the flanges. Label rings shall have provisions for customs sealing.
NOTE Label rings and/or protection rings can provide adequate reinforcement for the flange insertion and can protect the drum stock neck against corrosion.
7 Designation
Closure components manufactured in accordance with EN 12928 shall be designated:
Octagonal base inserted flange (type C1) closures for steel drums:
EN 12928 G2 and G3/4 flanges;
EN 12928 G2 and G3/4 plugs;
EN 12928 G2 and G3/4 capseals;
EN 12928 G2 and G3/4 label rings;
EN 12928 G2 and G3/4 protection rings;
Serrated base inserted flange (ype C2) closures for steel drums:
EN 12928 G2 and G3/4 flanges;
EN 12928 G2 and G3/4 plugs;
EN 12928 G2 and G3/4 overseals.
BS EN 12928:2000 – Inserted flange type closure systems for steel drums with a total capacity of 17 l to 230 l