Integral Valve InterlocksApplication Data Sheet – Tanker Loading/unloading

Road / Rail / sea Tankers

The transportation of bulk toxic or flammable products by road, rail or sea is common practice today. The most dangerous part of this transportation is the loading or unloading of the tanks when spillage or leakage of hazardous gases or liquids can cause injury to humans and / or potentially explosive situations to occur.

Product transfer procedures for these materials are typically controlled by manual operations which leave all responsibility for safe control of the process in the hands of the operators concerned.

The use of Kirk Key Eagle Integral Valve Interlocks together with Kirk Key mechanical and electro-mechanical interlocks on loading/unloading systems is a proven way to safely control this type of application throughout the world. The use of Kirk Key Interlocks will control a defined sequence of equipment operation to minimize or eliminate hazards involved in any system.

www.Kirkkey.comProcess safety Control

Indu

stri

esOil Refinery

Petro-Chemical

Pulp & Paper

Liquefied Gases

Multi-Turn Valve Interlock

Quarter-Turn Valve Interlock

Key 1

Key 3

Key 3 Key 2

Key 2

Key 4

Key 5

GladhandSupervisorControl

SupervisorControl

Valve B

Valve A

Tanker Loading/Unloading cannot commenceuntil gladhand is in locked position,

pipeline valves are openedand pump motor is energized

Pump Starter

The interlocking logic shown above illustrates a typical loading/unloading arrangement.

INITIAL SYSTEM STATUS: The pump starter is in the ‘OFF’ position. Valves A & B are locked in the closed position. The loading/ unloading area is vacant. The Supervisory Control Key 1 is held in Control with the Glad Hand Trailer Brake Lockout Unit (GHU).

SYSTEM OPERATION: 1) The tanker driver is instructed to enter

the loading facility.

2) The system operator issues the GHU with Key 1, Key 2 is trapped in the GHU. The unit is attached to the tanker emergency brake line connection to lockout the tanker brakes—locking the tanker in place. When correctly connected Key 2 is release from the GHU.

3) The operator then inserts Key 2 into lock fitted to Valve A to unlock, and allow the valve to be opened. The valve is locked open by removing Key 3.

4) The operator inserts Key 3 into lock fitted to the Valve B to unlock and allow the valve to be opened. The valve is locked open by removing Key 4.

5) Finally the operator inserts Key 4 into Pump Starter Switch to allow the power to the pump to be turned ‘ON’. The Pump Starter is locked in the ‘ON’ position by removing Key 5 which is returned to Supervisory Control.

6) After completion of the loading/ unloading operation the sequence is reversed to allow the tanker to exit the facility maintaining safe spill free operation.

Interlocking Logic

Operation

Integral Valve interlocksApplication Data Sheet – Tanker Loading/unloading

Road/Rail Barriers

Hose

Gantry Access

valve

Electrical Switch for Pumps

Interlocking designs can be made to suit any operational Requirements

Typical tanker loading/ unloading systems can include any of these locks or interlocks.

www.Kirkkey.com

Road / Rail / sea Tankers

Global Headquarters | 9048 Meridian Circle NW | North Canton, OH 44720 | USA 800.438.2442 | FAX 330.497.4400 | sales@kirkkey.com