Modco Industries LLC, 10650 FM 1484 Conroe, TX 77301 / Phone: 936-539-9222 / FAX: 936-622-6818
MODCO FIGURE 500 HINGED CLOSURES
WELDING INSTRUCTIONS
1. THE CLOSURE SUB SHOULD BE THE LAST ITEM WELDED TO THE VESSEL OR BARREL.
VERY IMPORTANT: WEDGING OF CLOSURE SUB TO BARREL OR SHELL COULD
CAUSE CLOSURE SUB WARPAGE OR OUT- OF- ROUNDNES,
WHICH COULD PREVENT CLOSURE FROM SEALING.
2. UNSCREW CAP AND REMOVE 0-RING FROM THE SUB.
3. ON HORIZONTAL HINGED CLOSURES (16” THRU 48” SIZES) POSITION THE JIB COLUMN
HOUSING AT 12 O`CLOCK CENTER ON TOP OF SUB AND BE SURE THAT SUB FACE IS
PERFECTLY VERTICAL.
4. TACK WELD SUB EVERY 4 TO 6 INCHES AROUND CIRCUMFERANCE AND RE-CHECK
VERTICAL POSITION OF SUB FACE.
5. CAP MY BE SCREWED ONTO SUB TO PROTECT SUB THREADS FROM WELDING SPLATTER
AND FOREIGN PARTICLES. (OPTIONAL)
6. AS A PRECAUTION AGAINST SUB DISTORION DURING WELDING, IT IS SUGGESTED THAT
THE SUB BE BRACED FROM 12 O’CLOCK TO 6 O’CLOCK AND 3 O’CLOCK TO 9 O’CLOCK.
THIS ESPECIALLY IMPORTANT ON THIN WALLS SUBS.
7. THE FOLLOWING PROCEDURE IS RECOMMENDED BY LINCOLN ELECTRIC COMPANY AND
THEIR BULLETIN “PIPELINE WELDING”:
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