A. By placing packing between the hand-hole plate and the boiler plate.
Q. What is the best kind of packing to use for this purpose?
A. Two or three ply sheet rubber is the best, cut in the form of a ring to fit the bearing surface of the plate.
Q. Can any other material be used?
A. Yes, hemp or cotton packing. When this is used it should be pulled out in fine shreds and thoroughly oiled before putting in position. Use as little as possible.
Q. Do the metals need any preparation?
A. Yes, all the old packing that may have burned on the metal should be thoroughly scraped off, also the scale should be removed from the vicinity so that the packing will have a smooth and even surface to bear against.
Q. How are man-hole plates put in position?
A. In the same manner as the hand-hole plates.