P ERFIL DE TRÁFICO

Dresser sleeve connections are also used where a connection will not be dismantled very often. These sleeves are used less frequently because of the risk that vibrations will loosen the sleeves.

Safety relief valve

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These valves are commonly called pop-offs. It is essential that these pressure relief valves function correctly when they are needed. The valves keep the pressure in our bulk equipment from exceeding set limits. This protects

people as well as equipment. All pressure relief valves must comply with Well Services Safety Standard 27: Inspection and Testing of Pressure Relief Valves and Gauges, InTouch content ID# 3313707.

The specifications, as well as the proper way to mount and inspect these valves, can be found in Maintenance Bulletin 625E MUST DO - Pressure Vessel, and Relief Valve Inspection and Test Procedures, InTouch content ID# 3998770, which includes an inspection as well as testing and calibration dates and procedures.

Some countries have legal requirements regarding the inspection and testing of relief valves. If local requirements exceed Maintenance Bulletin 625E they are to be followed. In the absence of local regulations, follow Maintenance Bulletin 625E.

Vacuum/pressure gauge

All air compressors and bulk tanks should be fitted with pressure gauges. Pressure gauges allow an operator to control the operation of the equipment safely and efficiently.

As with all mechanical equipment, pressure gauges must be checked to ensure that they are working properly. The Maintenance Bulletin 625E MUST DO - Pressure Vessel and Relief Valve Inspection and Test Procedures, InTouch content ID# 3998770 lists part numbers for the preferred gauges and also describes a procedure for checking the accuracy of each gauge.

The counterpart for the pressure gauge, which is used in the pressure/vacuum system, is a pressure/vacuum gauge that will have the pressure and vacuum readings. It will read 30-in mercury to 60 psi pressure.

Pressure gauge

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Mechanical load cell

Digital readout (left) and electronic load cell (right)

JET 6 – Bulk System Training Manual v1.0 _

There are two types of bulk pant weight

measuring devices used in Schlumberger. The mechanical load cell type, and the electronic load cell type with digital readouts, which are used in most new or upgraded plants in North America today. These systems also have pointer confirmation with a data link to the front office.

WEIGHT MEASURING DEVICES

9.9.0

Mechanical load cell

The load cells used on the WBB and surge cans are hydraulic and are similar to the gauge saver diaphragms used on triplex pumps. The same hand pump used to inflate a gauge saver diaphragm can be used to inflate a load cell. For proper maintenance and calibration, refer to the product maintenance manual.

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1. Inspect the exterior of the tank for: A. Rust and pits in weld.

B. Cracks in and near welds.

C. Sharp dents, especially in welded joints.

D. Pay particular attention to cone, shell, and head penetrations (pipe entries) for cracks and pitting near welds. E. On the mobile tank pay particular

attention to welds at the tank supports, which may be cracked due to fatigue and loose tie-down bolts.

F. Any welding or cutting to be done on the tank must be done by an ASME code shop with an “R” stamp and re- inspected by an ASME code inspector who prepares a partial Data Report. In countries outside North America all work should be performed and inspected to that country’s ASME equivalent.

Items B and C should not be found on tanks in permanent installations, but they may be fairly common on mobile tanks.

2. All pressurized bulk tanks, regardless of the products they contain, must be pneumatically pressure tested to the manufacturer’s working pressure annually. This test is best performed with the tanks full, as follows:

A. Isolate and pressurize the tank to the manufacturer’s working pressure.

B. Ensure that the pressure relief valve is functioning by noting the pressure at which it relieves.

C. Ensure that there are no leaks at any connections or hatches. Any leaks must be repaired before returning the tank to service.

D. Document the results of the pressure test and retain them at the district. 3. The gasket on the manway must be removed, cleaned and greased. The mating surface must be clean and flat.

4. If the visual or pressure inspection by a Schlumberger inspector reveals any flaws or poor workmanship, an ASME code or equal inspector must be consulted for advice on how to proceed. The code inspector may run a magnetic particle and sonic thickness test to determine the extent of any flaw, damage, or wear. If the tank requires repair, an ASME or equal repair facility must perform the work. Each tank must have an identifying number (unit/asset number) which will be used to make a record of the test for the unit file.

This test is best performed while the tanks are filled to eliminate the tremendous air volumes involved.

It is no longer a requirement to hydrostatically test bulk tanks during the annual inspection. The only time a hydrostatic test is required is when a tank is repaired. This test is conducted by the manufacturing or repair shop involved.

GLOSSARY

10.0.0

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