Ball Valve Testing

DAFRAM - BALL VALVES & TRUNNION MOUNTED VALVES INSPECTION & TESTING

According to written procedures the whole manufacturing process of ball valves is continuously monitored by the following inspections and tests procedures:

Customer evaluation and monitoring
Checking of raw incoming materials certification
Inspection of manufacture of valve components
Pressure tests
Functional tests
Non destructive tests
Final inspection of finished valves

[widgetkit id=1]

STANDARD TEST

PRESSURE TEST

Every Dafram ball valve is 100% pressure tested in accordance with API 6D & API-598 International standards, including Double Block & Bleed and Double Piston Effect tests, where applicable.

SPECIAL TESTS

If specified by the purchaser, for different purposes, to verify valve properties and performances, to verify material chemical composition or mechanical properties, to qualify valves to special working conditions or to long working life, many different tests can be performed as below:

VALVE TESTS

Pressure test at high/low temperatures
Low & High pressure seat gas test in accordance with Annex C of API 6D
On customer request, pressure tests can be performed in accordance with customer standards.
Anti static test
Valve Torque test.
Functional valve test or functional valve and actuator test.
Fugitive emission test to ISO 15848 or to other standards
Paint dry film thickness check
Insulating coat testing by holiday detector ISOLTEST HD93 Foto3:rilevatore di discontinuit�
Cavity relief test
Cryogenic test down to minus 196 �C
Strain gauge test

NON DESTRUCTIVE MATERIAL TESTS

All tests performed by qualified personnel, certified in accordance with EN 473 or SNT-TC-1A
Radiographic examination (RT), X-Ray or Gamma-ray
Magnetic particle examination (MT)
Ultrasonic examination (UT)
Dye penetrant examination (DP)
Positive material identification (PMI)
Hardness test

DESTRUCTIVE MATERIAL TESTS

Mechanical tests, hardness test and Impact test down to � 196�C
Chemical analysis of carbon, stainless steels, duplex, superduplex and high alloys using spectrometer
Corrosion tests (e.g. Pitting, SSCC, Huey, Crevice)
Micro examinations by electronic microscope up to x500 magnifications
Ferrite check to E562
Hydrogen-inducted cracking test
Pull-off test for paint adhesion check