insulating joint catalogue card

Practical application

1. on existing objects, and during building,
2. on gas pipings, water line and liquid fuel pipings,
3. before and over distribution gas stations,
4. in systems storerooms oil and gassy mines,
5. on gasholders and liquid fuel tanks,
6. under and overground building.

Mechanical properties
• bodies of insulating joints are made as welding construction of steel plates (from constructional carbon steel or low-alloy steel),
• results of ivestigations and tests are in documentation enclosed to ours products.

Electrical properties
• using high class insulating materials is graduate high quality,
• using exchangeable spark gaps,

1. lack of sparking and breakdowns during erectrical test at alternating voltage 5kV (50 Hz) in timel min. (test are made before and after hydrostatic test),
2. insulating joint's resistance above 5 MO at voltage 1 kV in dry condition,
3. lack of brakedown at voltage 15 25 kV during control of leaktightness insulating coat connection external spark gap - insulating joint.

Calculations

1. calculations are carried out according to WUDT-UC-WO-0 and PN-EN 13480-3,,
2. additional value of bending moment and tensile forces might be dictated by customer,
3. necessary parameter to carry out calculations is giving operating pressure.

Materials
• used pipes to welding according to PN-EN 10208, DIN 1626, API Spec 5L, ASTM A53 and others,
• (rings) steel elements are performed from metal plate and die forging wg PN-EN 10028,
• 0-nng seal is nitryl, fluoride or silicone rubber, that is ageing resitance and resistnce in common use medium,
• laminating. epoxide plates are insulating materials according to PN-EN 60893 and DIN 7735.

Welding and non-destructive tests

1. steel elements of insulating joint are connected by MIG-welding according to approved procedures by independent certificate organisation,
2. carried out fusion welds are testing non-destructive methods: VT (visual test), PT (dye penetration test) and UT (ultrasonic test) through specialists who have competence certificate of Welding Technology Institute.

Using external coating
• polyurethane caoating according to PN-EN 10290,
• termo-shrinkable coating according to PN-EN 12068, XANUSA" ,,REIHEM"
• paint coating (epoxides) according to PN-EN 12944.

Using internal coating (lining)
• paint coating (epoxides) according to PN-EN 12944, PN-EN 10301

Tests
• construction, dimensions, materials,
• hydrostatic strenght test for l,5xMOP pressure (maximum operating pressure),
• pneumatic leakproof test for pressure - 6 bar,
• electrical test at alternating voltage 5kV / 50 Hz in time 1 min. (sparking - not give rise),
• resistance above 5Mf2 at constant voltage 1 kV.

The range of execution
• working parameters of insulating joints that are shown in table below, apply to standard carrying out.
• there is an opportunity of providing insulating joints by increasing working parameters, which means:
working pressure to 420 bar (ANSI 2500), working temperature -50'C ^ 160*C,
• additional carrying out with internal spark gap or adaptation for external spark gap.

order sheet insulating joint