Theatre Design & Technology - Summer 2003 - 20

Expert inspectors have extensive knowledge of structural
materials properties, including what steel under stress actually
looks like. Experts use standard measurement and hand tools,
with a voltmeter occasionally employed to check for errant
electrical current in motorized components. Binoculars and
mirrors may be used for viewing hard-to-reach areas of the
system. Careful inspection of steel hardware and other components sometimes requires a magnifying glass. To guarantee accuracy, measurement equipment such as torque wrenches and
"go-no go" gauges for Nicopress sleeves must be carefully
calibrated and in perfect working order.
A complete rigging inspection can take anywhere from
several hours to two full days, depending on the size of the
fly system, the number of linesets and building design factors. Inspectors often find it difficult to estimate the time
needed to thoroughly inspect a lineset system until they
have seen the facility.

SAFETY INSPECTION COSTS
A professional safety inspection of a counterweight rigging system may cost between $350 and $850. If the system's complexity requires a two-day assessment period, the rate may go
up by $350 to $500 for the second day. Inspection firms routinely charge a flat rate based on the type and complexity of the
rigging system plus expenses which include travel, lodging and
per diem. Quantity discounts for inspecting two or more facilities can be negotiated by universities and large performing
arts complexes with several theatres. Inspectors say they also
consider reduced rates for long-standing customers and in
special cases where capable in-house assistance reduces the
time needed to do a thorough inspection.
Although preventative safety measure expenses are sometimes offset by decreased insurance costs, regular documented safety inspections usually do not lead to an insurance
premium discount for the venue (Lively). Apparently the risks
inherent in rigging operation are factored into overall liability
and do not themselves raise a "red flag" for insurance risk calculations. Of course, the decision to hire a professional inspector is not primarily a financial one, as the liability
protection and safety benefits more than compensate venue
operators for the inspection expense.

Rope Lock
Counterweight Arbor

RECOMMENDED FREQUENCY OF INSPECTION
How frequently a system is used will govern how often it
should be inspected. One expert says most facilities could
safely assume an annual inspection sufficient, but heavily used
venues may need a follow-up two to four times a year. Constant-use roadhouses are one example of a facility requiring
more frequent safety inspections. Glerum relates how large
touring companies often move, add or remove linesets in
roadhouses and sometimes either pay for follow-up inspections after their local run or have specialized staff do the job as
part of load-out activities. Thomas Pettus suggests that with
well-trained personnel on staff doing annual in-house inspections, a professional oversight inspection should be arranged
every three years. Glerum agrees that safety inspection should
be an ongoing process enacted daily by trained, observant operators using the system. Pettus believes that facilities such as high
schools should consider more frequent inspections because they
are likely to have less qualified personnel operating and maintaining their counterweight equipment, leading to increased wear
and possible unseen damage or hardware misuse.

COMMONLY OBSERVED PROBLEMS AND POSSIBLE SOLUTIONS
The most common problems reported by inspectors include
improperly tightened wire rope clips on lift-line terminations
or arbor connections and worn-out or incorrectly adjusted
rope locks. Poorly aligned blocks resulting in fleet angles,
where cable travel is not perpendicular to the sheave axis, can
also damage cables and sheaves over time. In addition to regular visual inspection of these critical components by a trained
technician, a facility's minimum preventative maintenance
measures should include checking wire rope clips and other
system hardware with a torque wrench to ensure they are all
tightened to correct torque amounts.
The misuse of spacer plates on counterweight arbors is
another common concern often overlooked by operators, and
inspectors often find anchor shackles incorrectly aligned under tension. Experts also report that accumulated dust in
sheaves can affect bearing operation and ultimately lead to
rapid wear on wire rope passing through the sheaves. Pettus
notes that many movement-related problems, such as subtle

Tension Block

The most common problems
reported by inspectors include
improperly tightened wire rope
clips on lift-line terminations or
arbor connections and worn-out
or incorrectly adjusted rope locks.
ILLUSTRATIONS BY GEORGE CHIANG,
FROM BACKSTAGE HANDBOOK BY PAUL CARTER

TD & T

S U M M E R

2 0 0 3

19



Table of Contents for the Digital Edition of Theatre Design & Technology - Summer 2003

Contents
Theatre Design & Technology - Summer 2003 - 1
Theatre Design & Technology - Summer 2003 - 2
Theatre Design & Technology - Summer 2003 - 3
Theatre Design & Technology - Summer 2003 - Contents
Theatre Design & Technology - Summer 2003 - 5
Theatre Design & Technology - Summer 2003 - 6
Theatre Design & Technology - Summer 2003 - 7
Theatre Design & Technology - Summer 2003 - 8
Theatre Design & Technology - Summer 2003 - 9
Theatre Design & Technology - Summer 2003 - 10
Theatre Design & Technology - Summer 2003 - 11
Theatre Design & Technology - Summer 2003 - 12
Theatre Design & Technology - Summer 2003 - 13
Theatre Design & Technology - Summer 2003 - 14
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Theatre Design & Technology - Summer 2003 - 16
Theatre Design & Technology - Summer 2003 - 17
Theatre Design & Technology - Summer 2003 - 18
Theatre Design & Technology - Summer 2003 - 19
Theatre Design & Technology - Summer 2003 - 20
Theatre Design & Technology - Summer 2003 - 21
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