. Large equipment positioned close to boundary limits mayrequire erection from the outside.. Ascertain whether sufficient space will be available at theconstruction phase.. Operation and maintenance should be reviewed by theeventual operating company. Give consideration tomaintenance access to air fins and the like above pipe tracks.. Consider the location of equipment requiring frequentattendance by operating personnel and the relative positionof the control room to obtain shortest, most direct routes foroperators when on routine operation.learancesAs in Table 1-1, access clearances between adiacent plants should atleast equal those for primary access roads. The space between edge ofany road and nearest equipment must be no less than 1.5 m.. Adequate road access with properly formed roads must beprovided for known maintenance purposes; for example, thecompressor house, large machinery areas, reactors, orconverters requiring catalyst removal and replacement.. Equipment requiring infrequent maintenance, such asexchanger tube bundles and tower internals, need adequatelevel clear space for access and removal purposes.. The ground need not be specifically built up to take loadsother than a surfacing of granite chips or similar, asduckboards, gratings, or other temporary material can be laidat the time when the plant is under maintenance.Paving. Within the process area, minimal concrete paving should besupplied for walkways interconnecting maior items ofequipment, platforms, stairways, and buildings.. Paving should be supplied around pumps or other machinerylocated in the open, underneath furnaces, and any other areaswhere spillage is likely to occur during normal operation.. Arcas containing alkalis, acids, or other chemicals or toxrcnrittcfials slroultl bc pavt'tl and bundcd to prcvcnt sl)illlgcslrIt'lrrliDg. ()lltcI afcits ()l lltc l)li[lt itrc lo l)c !lrit(l('(l i|ll(l