Safe Operation of Dry Break Couplings

NOTE – This article is only offered as supplemental information for your company’s existing operational guidelines.

Important Usage tips

  • Before the first use, your company’s engineering department should have verified that the coupler is compatible with the transfer product by checking the construction materials and respective seals.
  • Each SAS coupler is marked with a maximum pressure rating. This pressure level should not be exceeded.
  • The temperature ranges of the coupler and respective seals should also not be exceeded.

Daily visual inspection

Before each shift, usually daily, the SAS couplers and adapters should be visually inspected by the operator. Go through the following steps:

  1. First, the coupling system should be checked for leaks and drips. If a leak occurs, the coupling should immediately be taken out of service for inspection and repair.
  2. Next, confirm that the coupler and adapter are free of dirt and any obvious damage that could impair functionality.
  3. Ensure that rollers are working (three rollers per coupler).
  4. Check for damaged seals. For example, are any seal parts visually damaged or protruding from the coupler? Adapters should also be checked for seal damage.
  5. The swivel protects the hose from torque during the coupling process, so it is important to confirm that the swivel moves freely.

 

– Coupling and decoupling processes –

System Valves
As with any dry disconnect coupling system, the valve behind the adapter (tank unit) should be opened as a first step because trapped liquids can make safe coupling impossible, since the liquid cannot be compressed or escape.

Coupler Handle
The operator should not use anything except the handles on the coupler to complete the coupling process. Under no circumstances should the coupler be turned with excessive force or with wrenches or any other tools. Should the couplers become difficult to couple, they should be immediately be taken out of service for inspection.

Coupling process
Position the coupler for attachment to the adapter. The coupler should slide on smoothly as the adapter’s slots engage the coupler’s rolling arms. Now gently but firmly rotate the coupler clockwise for a ~90 degree turn. The operator may experience some minor resistance, which increases with higher line pressures, but should nevertheless be able to complete the turn. After the ~90 degree turn, the operator will feel a definite stop. Under no circumstances should the coupler be forced the turn beyond this point. Over-turning will not increase the couplers tightness but rather damage the unit.

Now the coupling process is completed and the unit will allow flow to occur.

Decoupling process
The decoupling process is very similar to the coupling process, but in reverse order. Prior to decoupling, the line pressure should be reduced and, if possible, flow through the coupling should be stopped.

Coupler Storage
After decoupling, the coupler should be stored in a secure place so that it is protected from physical damage. NOTE: The coupler should never be dropped on the floor. We always recommend the use of dust plugs and caps to keep the coupler and adapter free of accumulated grime and dust.