Grease Interceptor Baffle Repair in Phoenix

A baffle slows the water down and forces it to take the long way through the tank. That is what gives grease time to float and solids time to settle. The National Precast Concrete Association puts it in two lines: baffles increase retention time, and they prevent short-circuiting. Short-circuiting means water takes a straight shot from the inlet to the outlet.

When a baffle cracks, collapses or goes missing, the tank can still be half empty of grease and still pass grease. The pump truck driver sees a normal tank. The city sees a lateral with grease in it. Chandler says that when grease is witnessed leaving a device, the cleaning frequency has to go up. Pumping more often is a poor answer to a part that is broken. It buys you a monthly invoice and the same grease in the line.

Grease in the lateral soon after a pump-out is the clearest sign. Floor sinks that slow down a week after a clean tank is another. A third is an inspector's note. Phoenix inspectors check whether parts are missing or the interceptor has rotted out, and Tempe's list names holes, broken parts and severe corrosion.

Nothing shows from the lid. Standing water hides the wall, and a grease cap hides the water. A baffle is only visible when the tank is empty, which is why the repair visit follows the pump-out. For how to read a pump-out visit for clues, see what happens during a commercial grease trap cleaning.

The repair depends on what the baffle is made of. Many tanks are precast concrete with a partition wall between chambers. Others use a standpipe or baffle fitting, and the NPCA shows both as workable ways to do the same job. After the tank is pumped and the crew is in, the options run in order of how much has failed.

• A loose or displaced baffle fitting gets reseated and secured, or replaced if the material has failed.
• A cracked partition can be patched when the wall around the crack is sound and the crack is the only problem.
• A collapsed or missing partition is rebuilt only where the tank walls and floor can carry it.
• Grease baked onto the baffle gets chipped off by hand, because pumping alone often leaves it. That is part of our inside inspection after the pump-out.

We write down what was wrong, what we did, and what we saw in the rest of the tank, so the entry goes in your log the way Chandler and Phoenix describe.

Repair when the baffle is the only failed part and the surrounding concrete is sound. Replace when the tank itself is the problem. A baffle is only as good as the walls it is attached to. If the concrete is crumbling, a patched baffle will fail again, and Phoenix's inspection language says as much: an interceptor that has rotted out needs to be replaced.

Here is the practical test. If the failure is local, a repair holds. If the failure is spreading, or the baffle sits in a wall that has lost its surface, repair is money spent twice. We will tell you that on the spot, with what we saw. For what corrosion looks like, see concrete grease interceptor corrosion and repair, and for the replacement path see grease interceptor replacement.

Not every grease problem is a baffle. Before you pay for an entry, rule out the cheaper causes. A tank past 25 percent full of grease and solids stops working well, and Phoenix tells operators that is the point for a full cleaning. A fixture piped around the interceptor will put grease in the lateral no matter how good the baffles are. Enzyme or emulsifier products push grease through, and both Phoenix and Chandler prohibit them. Our page on grease in the sewer line after an interceptor walks through all five causes.

If the tank is full, schedule the pump-out first. If a part is broken, that is what this page is about.

A licensed hauler empties the tank. HQ does not pump. A three-person confined-space crew then enters, with fresh-air intake and a tripod and harness, looks at every internal part, repairs what can be repaired, and writes up the rest. The rules for that entry are on our confined-space entry page, and the scheduling of the two visits is on pump-out and repair coordination.

We offer 24/7 emergency service, free estimates and an upfront price before any work starts. If an inspector gave you a deadline, give us the date and we will plan around it. Related services are grease trap and interceptor service and restaurant plumbing.