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Sewer main

There are several drainage mechanisms are employed at petroleum and related facilities - surface runoff or grading, spill containment (diking), gravity sewers (oily water and sanitary) and pressurized sewer mains, and lift station collection sumps. [Pg.104]

Common practice and a general guide is to prevent combustible vapors from transmitting from one process area to another process area, generally 15.2 meters (50 ft.) or more away. Usually unsealed receptacles, such as drain funnels, tundishes, drain boxes, are routed to the nearest local sealed catch basin and then into the oily water sewer main. The unsealed receptacles are only allowed in the same process area equipment where if vapors where released from an adjacent unsealed receptacle it would be "immaterial" due to the proximity to where the liquid is being drained and would normally emit vapors. [Pg.105]

The exhaust fan and vacuum can be piped into your sewer main, but valves must be employed to keep this pressure from overcoming your water traps and blowing back into your house through the sink and bathtub drains. Most fans may not be capable of producing this much pressure, therefore you must try to use the valves if necessary. [Pg.131]

The oily-water sewer main should be run to the battery limit as a separate system and there connected to the oily-water trunk sewer which runs to an oil-water separator. [Pg.305]

Plot Plan Layout Aid. The plot plan will be a major aid in the design and layout of the various sewer systems. It will indicate the locations of all the various pumps, exchangers, tanks and towers. It will also indicate the extent of paved areas, roadways, undei ound utilities (water and electric) and the locations and inverts of the various sewer tie-ins to the sewer mains at the battery limits. [Pg.307]

Diked or curbed areas at tank farm and storage locations will also require provisions for surface drainage and should be divided into suitable drainage areas. These drains should be run to the oily-water sewer main. [Pg.308]

Seals should be provided on all inlets of sewer branches and sewer mains connecting to a catch basin or manhole (see Figures 8-5 and 8-6). A seal should consist of an elbow or a tee with outlet extending downward to provide for a minimum 6-inch seal. Some plants use a special combination seal and cleanout fitting designed to be inserted into the wall of the catch basin or manhole when the concrete is poured. [Pg.310]

Areas considered hazardous because of accumulations of flammable gases in the sewer mains should have sealed or gasketed catch basin and manhole covers to prevent escape or leakage of gases from sewer lines. [Pg.310]

Manholes (see Figure 8-6) should be installed in the sewer mains at 300-foot maximum intervals for sewer sizes up to 24 inches and at 500-foot maximum intervals for sizes above 24 inches. Manholes should also be installed at dead ends of sewer branches as a junction in sewer main runs where diameter (size) of the sewer main changes. [Pg.312]

The minimum size of the sewer main collecting two or more 4-inch sewer branches or drain hubs should be 6 inches. [Pg.312]

Invert. The invert of the sewer inlet and outlet at a catch basin or manhole should be at the same elevation when both inlet and outlet sewer mains... [Pg.312]

Sewer design should include provision for ample future expansion of the plant and unit areas. Sewer mains, in particular, should be sized to include the estimated flow of any future expansion. [Pg.313]

Hazardous areas subject to fire water from hoses should have sewer branches from each area sized accordingly. The amounts are not to be cumulative when estimating the size of sewer mains. One single 500 or 1,000 gpm allowance for the fire water flow quantity should be added to the sewer main flows — regardless of the number of hazardous areas within the plant site — starting at the upstream end of the sewer system under consideration. [Pg.313]

Permit access for in )eaion and cleaning tlie sewer main. [Pg.327]

Are required at intersections and changes of line size in sewer mains every 200 ft (61 m) in process units and every 400 ft (122 m) in off-site areas. [Pg.327]

All lines entering sewer boxes within a process unit must have a 6-in (150-mm) minimum water seal. For off-site sewer boxes, a straight-through flow for sewer mains is permitted, provided that laterals from other areas do not enter the sewer box or mains. The inside top of the outlet line is installed at or lower than the elevation of the inside top of the lowest inlet line before sealing,... [Pg.327]

Sewer main This is the primary drain line in a system it is separated into sections for safety reasons by sewer boxes. [Pg.328]

Laterals Laterals are drain lines collecting from two or more sublaterals, They discharge into the sewer main through a seal. [Pg.328]

Figure 6.9 Pits in the gaivanized water pipe that contributed to the erosion-corrosion of the gas iine and the subsequent ieak in a sewer main that caused the Guadaiajara 1992 expiosion [6]. (Courtesy of Dr. Jose M. Malo, Electric Research Institute, Mexico)... Figure 6.9 Pits in the gaivanized water pipe that contributed to the erosion-corrosion of the gas iine and the subsequent ieak in a sewer main that caused the Guadaiajara 1992 expiosion [6]. (Courtesy of Dr. Jose M. Malo, Electric Research Institute, Mexico)...

See other pages where Sewer main is mentioned: [Pg.336]    [Pg.336]    [Pg.267]    [Pg.268]    [Pg.270]    [Pg.279]    [Pg.307]    [Pg.309]    [Pg.313]    [Pg.220]    [Pg.694]    [Pg.914]    [Pg.1408]    [Pg.299]    [Pg.307]    [Pg.1]    [Pg.2]   


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