#Digital pipe fitter patch how to#
#Digital pipe fitter patch manual#
#Digital pipe fitter patch Patch#

The materials required for plastic patching are furnished in a special kit. Temporary repairs to some piping systems also may be made by using plastic patching materials.

#Digital pipe fitter patch Patch#

The main disadvantage of the Jubilee patch is that assorted sizes must be stocked since each patch is manufac- tured to fit only one size of pipe. When making up a patch of this type, be sure to reinforce the flange so it will be strong enough to hold against the pressure of the system. These patches may be obtained from standard stock or they may be fabri- cated on board ship. 2-23) are frequently used to stop leaks in piping. A sealing compound may be applied between the patch and the pipe to help seal the patched area. Back up the patch with a piece of sheet metal, and secure the sheet metal to the pipe with bolted metal clamps or similar devices. A good general rule is to make the temporary patch from the same type of material that is used for the flange gaskets in the system. The material used for the patch depends upon the type of piping that is being repaired. Temporary repairs are usually made by securing some type of patch over the damaged section of pipe. Temporary are made when the correct material is not available and/or the system cannot be secured for the time needed. Permanent repairs are made when the time and the material are available. Repairs to piping are classified as permanent or temporary.

#Digital pipe fitter patch how to#

The ABF should know how to locate and repair piping system troubles. There are miles of pipes in a fuel system, and damage to this piping can result from battle, accident, or merely the wear and tear of daily use. PIPE PATCHES While not a tool in the normal sense of the word, pipe patches are an integral part of the ABFВ’s tool- room.

#Digital pipe fitter patch manual#

Use the manufacturerВ’s data sheet or manual for reference. Inspect load chains for wear, reduction in link bar diameter, and increase in unit lengths. rating of the hoist or use extensions on the ratchet lever. Do not exceed the load Figure 2-22.В—Lever-operated chain hoist (come-along). Load chains should be lubricated and should show no indication of binding. Ratchet chain hoists come equipped with the load chain either of the roller sprocket (bicycle) or link chain type. Ratchet hoists are reversible so the load may be raised or lowered. A hoist has a ratchet and pawl or a friction disk brake incorporated in its mechanism to hold the load when the handle is released. It is normally light in weight and comes in a variety of sizes, depending on the job to be done. The ratchet hoist (come-along) has an operating handle similar to a ratchet wrench, hence its name. In more common terms it is usually called a come-along (fig. Lever-Operated Chain Hoist One of the widely used pieces of lifting equip- ment is the ratchet hoist. The lead (pitch) of the worm gear makes the hoist nonoverhaul- ing. The worm-geared hoist and the spur gear chain hoist operate in the same way except the gearing is reduced with the use of a worm gear drive. To lower, pull the operating chain in the reverse direc- tion, slipping the friction brake or releasing the ratchet-pawl device.

A me- chanical brake, consisting of a ratchet and pawl or friction disk unit plate, is used to sustain the load. The other end is attached to the hoist frame. The chain then passes over the load sheave. One end of the load chain is attached to the swivel load hook. The spur gears drive a single load sheave. The hand chain drives a pocketed chain wheel sheave that in turn drives the spur gears. Two separate chains are used, one as a load chain and the other as the hand chain.