Delivery system for liquefied gas with maintained delivery tank pressure

In a system for transferring a delivery fluid from a delivery tank to a customer tank, the system having a piping system and a pump assembly to transport the delivery fluid through the piping system, an apparatus for maintaining a vessel pressure in the delivery tank, the apparatus comprising:

• (a) a slip-stream junction where part of the delivery fluid downstream of the pump assembly is diverted back to the delivery tank;
• (b) a conduit for feeding back delivery fluid downstream of the pump assembly to the delivery tank;
• (c) a heat exchanger for exchanging heat between the delivery fluid and a heat exchanger fluid;
• (d) a controller;
• (e) a control element to monitor a condition related to the transfer of the delivery fluid and provide information to the controller;
• and
• (f) a controlled component that the controller adjusts in response to the information provided to the controller from the control element, in order to maintain a determined vessel pressure in the delivery tank, the control element being a vibration detector attached to the delivery tank.

In a system for transferring a delivery fluid from a delivery tank to a customer tank, the system having a piping system and a pump assembly to transport the delivery fluid through the piping system, an apparatus for maintaining a determined pressure in the delivery tank, the apparatus comprising:

• a slip-stream junction where a portion of the delivery fluid downstream of the pump assembly is diverted back to the delivery tank;
• a conduit for feeding back delivery fluid downstream of the pump assembly to the delivery tank;
• a heat exchanger for exchanging heat between the delivery fluid and a heat exchanger fluid;
• a controller;
• a vibration detector to monitor a condition related to the transfer of the delivery fluid and provide information to the controller;
• and
• a controlled component that the controller adjusts in response to the information provided to the controller from the vibration detector to maintain a predetermined pressure in the delivery tank.

In a system for transferring a delivery fluid from a delivery tank to a customer tank, the system having a piping system and a pump assembly to transport the delivery fluid through the piping system, an apparatus for maintaining a vessel pressure in the delivery tank, the apparatus comprising:

• (a) a slip-stream junction where part of the delivery fluid downstream of the pump assembly is diverted back to the delivery tank;
• (b) a conduit for feeding back delivery fluid downstream of the pump assembly to the delivery tank;
• (c) a heat exchanger for exchanging heat between the delivery fluid and a heat exchanger fluid;
• (d) a controller;
• (e) a control element to monitor a condition related to the transfer of the delivery fluid and provide information to the controller, control element being a flow meter located in the piping system between the pump assembly and the slip-stream junction;
• (f) a controlled component that the controller adjusts in response to the information provided to the controller from the control element, in order to maintain a predetermined vessel pressure in the delivery tank.