(1) Control requirement. Whenever the
unexpected startup of machinery, the energizing of electrical circuits, the
flow of material in piping systems or the removal of guards would endanger
workers, such exposure must be prevented by deactivating and locking out the
controls as required by chapter
296-803 WAC, Lockout/tagout (control of
hazardous energy).
EXCEPTION: In instances where any machine must be in motion for
proper adjustment, for removal or replacement of materials from the machine,
for machine clothing changes or for roping up, the following precautions must
be observed.
(a) The machine must be
operated at thread or jog speed;
(b) Extension tools which minimize personnel
exposure must be used where possible;
(c) The operating controls must at all times
be under the control of a qualified operator or craftsman;
(d) All personnel must remain in view of the
operator or other means of communication shall be established; and
(e) All personnel must be beyond the reach of
other machine section(s) or element(s) which offer potential exposure. In any
instance where such potential exposure exists, such other section(s) or
element(s) must be separately locked out.
(2) Group lockout or tagout devices.
Procedures must meet the minimum requirements of chapter
296-803 WAC,
Lockout/tagout (control of hazardous energy). You must develop a specific
written group lockout or tagout procedure and review it with the local plant
labor/management safety committee before it can be utilized.
(3) Temporary or alternate power.
(a) Whenever possible, temporary or alternate
sources of power to the equipment being worked on must be avoided.
(b) If the use of such power is necessary,
all affected employees must be informed and the source of temporary or
alternate power must be identified.
(4) Deactivating piping systems.
(a) Nonhazardous systems must be deactivated
by at least locking out either the pump or a single valve.
(b) Lockout of the following hazardous
material piping systems must isolate to the worksite and must provide
protection against backflow where such potential exists:
(i) Gaseous systems that are operated at more
than 200 psig;
(ii) Systems
containing any liquid at more than 500 psig;
(iii) Systems containing any material at more
than 130°F;
(iv) Any cryogenic
system;
(v) Systems containing
material which is chemically hazardous as defined by NFPA 704 1996 Class 3 and
4; and
(vi) Systems containing
material classified as flammable or explosive as defined in NFPA Class
I.
(c) Such systems must
be deactivated by one of the following:
(i)
Locking out both the pump and one valve between the pump and the
worksite;
(ii) Locking out two
valves between the hazard source and the worksite;
(iii) Installing and locking out a blank
flange between the hazard source and worksite. When a blank flange (blind) is
used to separate off portions of hazardous material systems from a portion
which is in operation, you must develop and implement a procedure for
installation and removal of the blank flange that will ensure all hazards have
been eliminated;
(iv) Line breaking
between the hazard and the worksite;
(v) On hazardous chemical systems where the
methods already listed are not feasible, or by themselves create a hazard,
single valve closure isolation may be used provided that potentially exposed
employees are adequately protected by other means such as personal protective
equipment;
(vi) On all steam
systems where the methods already listed are not feasible, single valve closure
isolation may be used provided that the system is equipped with valves meeting
all requirements of ANSI B16.5-1996 and ANSI B16.34-1996. Where single valve
isolation is used, the steamline must also be equipped with a bleed valve
downstream from the valve closure to prove isolation of the worksite.
Note: Bleeder valves are recommended behind all primary valve
closures on hazardous material systems. Consideration should be given to the
nature of the material in the system when installing bleeder valves. To assist
in preventing plugging, bleeder valves should generally be installed in the top
one-third of the pipe. Short exhaust pipes should be installed on bleeder
valves to direct the flow of possible escapement away from the position where
an employee would normally be when using the bleeder valve.
