TPi May 2015

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May 2015 Tube Products International 57
Engineered Piping Products – UK
would equate to a life of either 20 years or 15 years, not 50
years as claimed.
3 – Corrosion protection
Metal components are coated with epoxy coatings and other
surface protections. The nuts and bolts are Sheraplex coated to
WIS 4-52-03, offering long-term protection against corrosion,
impact and abrasion to ensure continued reliable protection
to corrosion, impact and abrasion, and therefore ensured
continued reliable performance (as discussed previously).
Valve dismantling
Rubber expansion joint – main advantages
• Easy to install – simply adjust the tie rod nuts on the inside
and on the outside of the flange, then compress or extend
the expansion joint to suit the gap.
• All face-to-face gaps and misalignments can be
accommodated by designing the rubber expansion joint to
take up the thermal movements and vibrational movements
along with any installation misalignments.
• Various grades of rubber to suit the medium, the design
pressure and temperature.
• All surfaces in contact with the medium are in rubber, so
there is no need for epoxy coatings or any other surface
protection.
• The expansion joint/dismantling joint can be removed and
installed many times without having to change any seals
etc.
• EPP can supply these joints up to 4m or 157" and pressures
up to 38 bar or 551 psi. The larger diameters are in lower
pressures.
Rubber expansion joints, for use
in dismantling, misalignments,
and thermal movements
Move the valve down between the flanges
Extreme misalignments within a valve pit