BROEN BALLOMAX, Техническое руководство

Страница: 33 / 37

BALLOMAX
®
API 6D Certified Trunnion Mounted Ball Valves - Technical Manual
33
Rev 08/2019
On Gear Operated Valves it is advisable to fully cycle operator before installation,
while observing operation and the proper set points of the travel stops in Fully
Open and Fully Closed positions. The travel stops are measured and set at the
factory and marked.
Testing of welds can be performed by Hydrostatic testing or Nitrogen testing as is
normal construction practice. The valve has already undergone API Hydrostatic
Shell Testing at the factory. To check the integrity of your welds, review the
dedicated section “Testing of Field Welds”.
Testing of field welds
After welding you may desire to test the welds hydrostatically or with nitrogen as
is common practice in the Industry. Below are our procedures.
a) Hydro Testing:
The valve has already undergone API certification at the factory and the
test certificates if requested from the factory show the results of these
tests. Never Test Against a Closed Ball Valve.
Field Hydrostatic testing should be as follows:
1) Fill the Pipeline with clean water, with the Valves in the FULLY OPEN
position. Filling the pipeline with valves in the partial open position
allows for rust scale and trash to enter the valve body.
2) Once filled, you can move the ball to ½ open position to allow the
cavity of the valve to fill with water.
3) Pressurize the line and perform test.
4) Valves should be returned to Fully Open Position before draining
Pipeline. This prevents rust scale and trash entering the valve body
and building up in the soft seat area which may cause damage to
seats.
5) Upon draining of the Pipeline, it is necessary to drain the valves using
the drain in the bottom of the trunnion to remove all water from the
cavity of the valve.
6) Note: if the valve has been left in the partial open position for an
extended period, you need exercise the valve several times and leave
the valve in the Full Open or Fully Closed position for the Soft Seat
material to cold flow back into position for 100% shut off.