Page 278 - Reciprocating Compressors Operation Maintenance

Overhaul and Repair of Reciprocating Compressors 263

Even though the cylinder may have enough material that can be
removed to accept a liner, this option is not always available. In some
cylinders, liners are confined by specially configured head geometries,
Thus, each case must be looked at and evaluated separately.

Metal Stitching

When cracks are discovered, welding is not usually recommended.
Cast iron is difficult to weld. Sometimes, the welded cylinder can be
damaged beyond repair. Wherever possible, a procedure called metal
stitching is recommended. This is a cold repair. When done correctly,
metal stitching can return the equipment to its original strength character-
istics and integrity (see Figure 4-18).

Hot* M driMtf MMH Uw In* ol
InCMralO MM Mm)* tMpffl.

Wflformlfla to MM th*p« of ttw lock*.
TM tocM u* imwMd Mo aw
•pMtura*, HMD pwncd Mo m*HH»

ttMcmc*,ft*nUpptd-
STITCH

titfi <tutf tftfltn talo Mt pmltcf itof-
IMt MMito b * pNWtWMlBM fc*>l
•ml mtoratittMly w m* c«ttn»
CED
Tlw Mudt w* nn down unU UMlr

Th« renaming rough HM 1*1 It i*mow»d
wnt>pn*um*UochlMl»

_ FILLER BOLT

FIGURE 4-1 8. Metal stitching sequence. (Source: In-Place Machining Com-
pany, Milwaukee, Wisconsin.)