Flange Repair

Small Cut or Gouge 

Severe Pitting/Corrosion – One Side

Severe Pitting/Corrosion – Both Sides

Small Cut or Gouge  

Flanges that have a small cut or gouge may be repaired in the following manner:

1) Prepare repair area according to Metals Preparation Guide.  Afterwards, degrease surface thoroughly with Metal Prep II™.

2) Mix a small amount of Steelstick™  according to instructions.  Force the material well into the cavity, and allow a slight protrusion above the face of the flange.  (Fig. 1)

3) After Steelstick™  has set, (typically 15 - 20 minutes), sand the surface smooth using 400 to 600 grit wet cut abrasive.  (Fig. 2)

4) Flange is now ready to return to surface.

Severe Pitting/Corrosion -One Side

1) Prepare surface of pitted flange according to the Metals Preparation Guide.  Thoroughly clean and degrease with Metal Prep II™.

2) Apply ML900 Silicone Lubricant & Release Agent to surface of the good or new flange.  Also apply it to the assembly bolts and then insert them into the flange holes.

3) Apply ML400 Machinable Repair™  to the surface of the pitted flange at least 1/16" thick.  (Fig.3)

4) Assemble both flanges and bolt together.  Wipe off excess material and allow curing fully.  (Fig. 4)

5) Disassemble and clean/grind around bolt holes.  Flange is now ready to return to service.

NOTE:  This repair should not be attempted on flanges with operation temperatures higher than 300°F. 

Severe Pitting/Corrosion -Both Sides

Flanges that are scored or pitted on both surfaces may be repaired in the following manner:  (Fig.'s 5 & 6):

1) Abrade surface of pitted flanges by sanding, grinding, power-brushing, or grit blasting. Clean with Metal Prep II™ Degreaser.

2) Plug all bolt holes with corks, wooden plugs or putty.

3) Prepare a flat, smooth metal plate that extends beyond the diameter of the flanges to act as a mold for the new gasket surface.  Coat this with ML900 Silicone Lubricant & Release Agent.

4) Coat both pitted flange surfaces with ML400 Machinable Repair™ at least 1/16" thick.

5) Install smooth metal plate between flanges, clamp together, wipe off excess material and allow curing fully.

6) Disassemble and clean/grind areas around bolt holes. Install new gasketing and return to service.

Note: This repair should not be attempted on flanges with operating temperatures higher than 300°F.