Long-term storage
About this task:
In order to protect the waterbox of pressure vessels from rusting, the tube side (water side) has
been purged and charged with nitrogen to a positive pressure of 5 psig to 7 psig.
Do not break the seal or remove closures until ready for setup. Use the following procedure to
relieve pressure. See Figure 3.
WARNING
Failure to follow the following procedures will cause severe personal injury or death to operators
themselves or people on-site. It is the obligation and responsibility of operators to identify and
recognize the inherent hazards of material under pressure and to protect themselves.
1. Check that the working space is open and has good ventilation. If is does not have good
ventilation, connect a hose or pipe to the valve (Item 5) and route it to outside.
2. Slowly open the valve (Item 5) until fully opened.
3. Monitor the pressure gauge (Item 2). The pressure should decline gradually.
4. When the pointer of the pressure gauge stops moving and no nitrogen is released from the
valve (Item 5), it means that no positive pressure exists in the waterbox.
5. Now it is safe to remove the flange cover (Item 6) or sealing cap (Item 9).
6. Close the valve (Item 5) and remove the warning tag (Item 1).
11
Model YK Chillers (Style H) Field Reassembly for Form 3, 7, 9, and 10 Shipment
