Rubber expansion joints

Standard Moulded

MAC-W & MAC-WT Series

These are the standard moulded or custom made Expansion Joints consisting of high quality rubber body incorporating floating flanges.

Rubber bellows: Reinforced EPDM, EPDM HT, Nitrile, Spec. Nitrile, Nitrile white, Hypalon, SBR, Viton®, Chloroprene, etc.

Flanges: Zinc plated carbon steel as standard. Also, available in hot dip galvanized carbon steel, stainless steel, etc. drilled to EN and ANSI standards. On request, flanges are also available drilled to JIS and AWWA standards.

For vacuum applications, an internal stainless steel vacuum ring is incorporated.

Standard moulded construction from DN 32 to DN 1000 (see table for standard dimensions). Larger sizes can be supplied custom made up to DN 6000.

A high quality moulded or custom made single arch unrestrained expansion joint consisting of a rubber bellow incorporating floating flanges. 

This model absorbs all the movements in any one length of piping.

Unrestrained expansion joints under pressure will exert a considerable axial force on the pipeline, i.e. anchors. It is essential that checks are carried out when the expansion joint is first pressurized to ensure that there is no unforeseen stretching of the bellows. If unforeseen movement is apparent, then the pipe guides or anchors shall be examined to ensure that they have been installed correctly and sufficiently designed for the duty.
MAC-W

A high quality moulded or custom made single arch unrestrained expansion joint consisting of a rubber bellow incorporating floating flanges.

This model absorbs all the movements in any one length of piping.

Unrestrained expansion joints under pressure will exert a considerable axial force on the pipeline, i.e. anchors. It is essential that checks are carried out when the expansion joint is first pressurized to ensure that there is no unforeseen stretching of the bellows. If unforeseen movement is apparent, then the pipe guides or anchors shall be examined to ensure that they have been installed correctly and sufficiently designed for the duty.

As MAC-W but incorporating control units/tie rod system. A control unit assembly is a system of 2 or more control rods placed across the expansion joint from flange to flange to set the maximum allowable expansion/contraction of the expansion joint and that will contain the pressure thrust. Recommended on most applications to prevent damage due to excessive pipe movements, each rod incorporates double nuts on each end to keep the expansion joint from over- elongating and spherical washers to allow Lateral, Angular and some Torsional movements as well as to accommodate moderate piping misalignments.
MAC-WT

As MAC-W but incorporating control units/tie rod system. A control unit assembly is a system of 2 or more control rods placed across the expansion joint from flange to flange to set the maximum allowable expansion/contraction of the expansion joint and that will contain the pressure thrust. Recommended on most applications to prevent damage due to excessive pipe movements, each rod incorporates double nuts on each end to keep the expansion joint from over- elongating and spherical washers to allow Lateral, Angular and some Torsional movements as well as to accommodate moderate piping misalignments.

MAC-W & MAC-WT standard dimensions

Specific dimensions can be provided custom made

DN Lenght (mm) Compression (mm) Extension (mm) Lateral (mm) Angular (deg) Working Press.(bar)
32 130 & 150 30 20 20 30 16
40 130 & 150 30 20 20 30 16
50 130 & 150 30 20 20 30 16
65 130 & 150 30 20 20 30 16
80 130 & 150 30 20 20 30 16
100 130 & 150 30 20 20 25 16
125 130 & 150 30 20 20 25 16
150 130 & 150 30 20 20 15 16
200 200 & 130 30 20 20 15 16
250 200 & 130 30 20 20 10 16
300 200 & 130 30 20 20 10 16
350 200 30 20 20 10 10
400 200 30 20 20 10 10
450 200 30 20 20 10 10
500 200 30 20 20 10 10
600 200 30 20 20 6 10
700 275 40 25 30 5 10
800 275 40 25 30 4 10
900 300 40 25 30 3 10
1000 300 40 25 30 3 10