12
PI-078
June 2021
pressure at which it will operate. 10,000 psi operating pressure rigid
lances must have a minimum 30,000 psi burst rating. Do not use a rigid
lance that has an unknown burst or unknown manufacturer’s operating
pressure rating.
3. Clearance between lance and tube must be sufficient to permit the
unrestricted backflow of water and debris. With tubes containing hard
deposits this clearance should be 1/8” minimum on the diameter (or
1/16” per side) of the lance. With tubes containing soft, pliable deposits
this clearance should be greater. Insufficient side clearance may cause
lance to blow back toward operator.
4. Be sure nozzle, lance and adapter thread sizes are compatible before
installing nozzle and adapter on lance. Do not use a rigid lance that has
damaged or missing threads.
5. Use wrench flats (when available) or a properly adjusted smooth jaw
plier wrench (JS PN 64119) to connect lance. Do not use pipe wrench as
wrench marks will cause high pressure components to crack and fail.
6. A rigid lance over 4 ft long requires two men for support and safe
operation. Operator at tube should use a foot control gun so he can
instantly relieve system pressure in case of emergency.
7. When using and moving lance, support it in a manner to avoid stress
and possible breakage at inlet end connection.
8. Never ”ramrod” lance into tube blockage.
9. Transport and store lances in tubes or racks to avoid bending,
corrosion or other damage. Damaged lances (bends, mars) should be
removed from service.
HIGH PRESSURE FITTINGS
1. Read General Safety
section prior to installing fittings in system.
2. Use non-brass or non-cast iron fittings which are made for high
pressure waterblast use.
3. Use only high pressure fittings which are clearly marked with the
operating pressure.
4. High pressure fittings should have a known burst rating of not less
than 3.0 times system operating pressure. Never use a damaged or cor-
roded fitting or one with damaged or missing threads.
5. Use only high pressure rated fittings and hose in the waterblast
system. For 10,000 psi waterblast service all fittings and hose should
have a minimum burst rating of 25,000 psi; for 15,000 psi service they
should have a minimum burst rating of 37,500 psi; for 20,000 psi ser-
