Varec 6700, Инструкция по установке и эксплуатации

Страница: 48 / 74

Liquid Level Indicator
40 Installation and Operations Manual
General Preparation
Use the Table of Contents to determine the appropriate installation figure in this Instruction
Manual. These are typical installations. All situations may not be covered. Contact Varec if
additional information is needed.
Warning Make certain that the tank is empty and not in service. Ensure that the tank has
been leak and pressure tested as appropriate for the liquid to be stored. Observe
appropriate safety precautions in flammable or hazardous liquid storage areas. Do not
enter a tank that has contained hydrocarbons, vapors, or toxic materials until a gas free
environment is certified. Carry breathing equipment when entering a tank where oxygen
may be displaced by carbon dioxide, nitrogen, or other gases. Wear safety glasses as
appropriate. Use a hard hat.
Warning Under most circumstances, the mechanical connections between the guide
cables and the anchors provide a resistance to ground that is adequate for the safe
electrical drain of electrostatic charges that may accumulate in the tank and the product.
Additional grounding may be needed for products with low flash points. Worker activity
and worker clothing may accumulate electrostatic charges on the body of a worker. Care
should be used in flammable environments to avoid the hazard. Observe American
Petroleum Institute (API) Recommended Practice 2003 or other appropriate industry or
military standard.
The user provides the 1.5-inch pipe that carries the tape/cable and the necessary mounting
and support welding. The user must drill holes as needed.
Assemble the necessary tools and equipment at the work site. Refer to Table 6 on page 10 for
suggested tools and equipment. Plan the pipe routing. Position the roof connection
installation into the tank interior within arms reach of a manhole or an inspection hatch.
Use these procedures to install a Varec manhole or inspection hatch, if there is none located
within arms reach of the tape pipe location.
Locate the float at a position inside of the tank where surface agitation on it will be at a
minimum. Install a deflector, if the product stream is close to the float. Contact Varec if
agitators will cause excess float disturbances. Vertical pipe runs must be plumbed and
perpendicular to prevent the tape/cable from binding inside the pipe.
The user must attach the gaugeboard to the tank by welding or bolting the supplied
gaugeboard brackets. If the environment is such that welding cannot be performed, the user
can construct a support structure close to the outside of the tank.
Warning The user should comply with all applicable regulations, codes, and standards.
For safety precautions, the user should refer to the appropriate industry or military
standards.
Independent Pipe Support Structure
Where the environment is such that welding cannot be performed, construct an appropriate
support structure of 3-inch [76 mm] pipe in segments away from the tank and weld the