diff --git a/autoplace_tubes.lua b/autoplace_tubes.lua
index 280bd60..0d28e64 100644
--- a/autoplace_tubes.lua
+++ b/autoplace_tubes.lua
@@ -1,7 +1,7 @@
 -- autorouting for pneumatic tubes
 
 local function is_tube(nodename)
-	return table.contains(pipeworks.tubenodes, nodename)
+	return pipeworks.table_contains(pipeworks.tubenodes, nodename)
 end
 
 --a function for determining which side of the node we are on
@@ -11,23 +11,23 @@ local function nodeside(node, tubedir)
 	end
 
 	local backdir = minetest.facedir_to_dir(node.param2)
-	local back = vector.dot(backdir, tubedir)
+	local back = pipeworks.vector_dot(backdir, tubedir)
 	if back == 1 then
 		return "back"
 	elseif back == -1 then
 		return "front"
 	end
 
-	local topdir = minetest.facedir_to_top_dir(node.param2)
-	local top = vector.dot(topdir, tubedir)
+	local topdir = pipeworks.facedir_to_top_dir(node.param2)
+	local top = pipeworks.vector_dot(topdir, tubedir)
 	if top == 1 then
 		return "top"
 	elseif top == -1 then
 		return "bottom"
 	end
 
-	local rightdir = minetest.facedir_to_right_dir(node.param2)
-	local right = vector.dot(rightdir, tubedir)
+	local rightdir = pipeworks.facedir_to_right_dir(node.param2)
+	local right = pipeworks.vector_dot(rightdir, tubedir)
 	if right == 1 then
 		return "right"
 	else
@@ -99,7 +99,7 @@ end
 
 function pipeworks.scan_for_tube_objects(pos)
 	for side = 0, 6 do
-		tube_autoroute(vector.add(pos, directions.side_to_dir(side)))
+		tube_autoroute(vector.add(pos, pipeworks.directions.side_to_dir(side)))
 	end
 end
 
diff --git a/common.lua b/common.lua
index 1ee734f..5574bb2 100644
--- a/common.lua
+++ b/common.lua
@@ -2,7 +2,7 @@
 -- Vector functions --
 ----------------------
 
-function vector.cross(a, b)
+function pipeworks.vector_cross(a, b)
 	return {
 		x = a.y * b.z - a.z * b.y,
 		y = a.z * b.x - a.x * b.z,
@@ -10,7 +10,7 @@ function vector.cross(a, b)
 	}
 end
 
-function vector.dot(a, b)
+function pipeworks.vector_dot(a, b)
 	return a.x * b.x + a.y * b.y + a.z * b.z
 end
 
@@ -18,7 +18,7 @@ end
 -- Facedir functions --
 -----------------------
 
-function minetest.facedir_to_top_dir(facedir)
+function pipeworks.facedir_to_top_dir(facedir)
 	return 	({[0] = {x =  0, y =  1, z =  0},
 	                {x =  0, y =  0, z =  1},
 	                {x =  0, y =  0, z = -1},
@@ -28,14 +28,15 @@ function minetest.facedir_to_top_dir(facedir)
 		[math.floor(facedir / 4)]
 end
 
-function minetest.facedir_to_right_dir(facedir)
-	return vector.cross(
-		minetest.facedir_to_top_dir(facedir),
+function pipeworks.facedir_to_right_dir(facedir)
+	return pipeworks.vector_cross(
+		pipeworks.facedir_to_top_dir(facedir),
 		minetest.facedir_to_dir(facedir)
 	)
 end
 
-directions = {}
+local directions = {}
+pipeworks.directions = directions
 function directions.side_to_dir(side)
 	return ({[0] = vector.new(),
 		vector.new( 0,  1,  0),
@@ -48,7 +49,7 @@ function directions.side_to_dir(side)
 end
 
 function directions.dir_to_side(dir)
-	local c = vector.dot(dir, vector.new(1, 2, 3)) + 4
+	local c = pipeworks.vector_dot(dir, vector.new(1, 2, 3)) + 4
 	return ({6, 2, 4, 0, 3, 1, 5})[c]
 end
 
@@ -56,7 +57,7 @@ end
 -- String functions --
 ----------------------
 
---[[function string.split(str, sep)
+--[[function pipeworks.string_split(str, sep)
 	local fields = {}
 	local index = 1
 	local expr = "([^"..sep.."])+"
@@ -67,7 +68,7 @@ end
 	return fields
 end]]
 
-function string.startswith(str, substr)
+function pipeworks.string_startswith(str, substr)
 	return str:sub(1, substr:len()) == substr
 end
 
@@ -75,7 +76,7 @@ end
 -- Table functions --
 ---------------------
 
-function table.contains(tbl, element)
+function pipeworks.table_contains(tbl, element)
 	for _, elt in pairs(tbl) do
 		if elt == element then
 			return true
@@ -84,7 +85,7 @@ function table.contains(tbl, element)
 	return false
 end
 
-function table.extend(tbl, tbl2)
+function pipeworks.table_extend(tbl, tbl2)
 	local index = #tbl + 1
 	for _, elt in ipairs(tbl2) do
 		tbl[index] = elt
@@ -92,11 +93,11 @@ function table.extend(tbl, tbl2)
 	end
 end
 
-function table.recursive_replace(tbl, pattern, replace_with)
+function pipeworks.table_recursive_replace(tbl, pattern, replace_with)
 	if type(tbl) == "table" then
 		local tbl2 = {}
 		for key, value in pairs(tbl) do
-			tbl2[key] = table.recursive_replace(value, pattern, replace_with)
+			tbl2[key] = pipeworks.table_recursive_replace(value, pattern, replace_with)
 		end
 		return tbl2
 	elseif type(tbl) == "string" then
@@ -110,11 +111,12 @@ end
 -- Formspec functions --
 ------------------------
 
-fs_helpers = {}
+local fs_helpers = {}
+pipeworks.fs_helpers = fs_helpers
 function fs_helpers.on_receive_fields(pos, fields)
 	local meta = minetest.get_meta(pos)
 	for field, value in pairs(fields) do
-		if field:startswith("fs_helpers_cycling:") then
+		if pipeworks.string_startswith(field, "fs_helpers_cycling:") then
 			local l = field:split(":")
 			local new_value = tonumber(l[2])
 			local meta_name = l[3]
@@ -146,7 +148,7 @@ end
 -- Env --
 ---------
 
-function minetest.load_position(pos)
+function pipeworks.load_position(pos)
 	if pos.x < -30912 or pos.y < -30912 or pos.z < -30912 or
 	   pos.x >  30927 or pos.y >  30927 or pos.z >  30927 then return end
 	if minetest.get_node_or_nil(pos) then
diff --git a/filter-injector.lua b/filter-injector.lua
index 72f7bad..0d22675 100644
--- a/filter-injector.lua
+++ b/filter-injector.lua
@@ -1,3 +1,5 @@
+local fs_helpers = pipeworks.fs_helpers
+
 local function delay(x)
 	return (function() return x end)
 end
@@ -169,7 +171,7 @@ local function punch_filter(data, filtpos, filtnode, msg)
 		is_fake_player = ":pipeworks",
 		get_wielded_item = delay(ItemStack(nil))
 	} -- TODO: use a mechanism as the wielder one
-	local dir = minetest.facedir_to_right_dir(filtnode.param2)
+	local dir = pipeworks.facedir_to_right_dir(filtnode.param2)
 	local frompos = vector.subtract(filtpos, dir)
 	local fromnode = minetest.get_node(frompos)
 	if not fromnode then return end
diff --git a/item_transport.lua b/item_transport.lua
index e906387..4f8d5d6 100644
--- a/item_transport.lua
+++ b/item_transport.lua
@@ -1,3 +1,5 @@
+local luaentity = pipeworks.luaentity
+
 function pipeworks.tube_item(pos, item)
 	error("obsolete pipeworks.tube_item() called; change caller to use pipeworks.tube_inject_item() instead")
 end
@@ -55,7 +57,7 @@ local function go_next(pos, velocity, stack)
 	end
 	for _, vect in ipairs(can_go) do
 		local npos = vector.add(pos, vect)
-		minetest.load_position(npos)
+		pipeworks.load_position(npos)
 		local node = minetest.get_node(npos)
 		local reg_node = minetest.registered_nodes[node.name]
 		if reg_node then
@@ -225,7 +227,7 @@ luaentity.register_entity("pipeworks:tubed_item", {
 			moved = true
 		end
 
-		minetest.load_position(self.start_pos)
+		pipeworks.load_position(self.start_pos)
 		local node = minetest.get_node(self.start_pos)
 		if moved and minetest.get_item_group(node.name, "tubedevice_receiver") == 1 then
 			local leftover
diff --git a/luaentity.lua b/luaentity.lua
index 50004ed..0105c91 100644
--- a/luaentity.lua
+++ b/luaentity.lua
@@ -1,6 +1,7 @@
 local max_entity_id = 1000000000000 -- If you need more, there's a problem with your code
 
-luaentity = {}
+local luaentity = {}
+pipeworks.luaentity = luaentity
 
 luaentity.registered_entities = {}
 
diff --git a/routing_tubes.lua b/routing_tubes.lua
index 0a82fc8..f415c3e 100644
--- a/routing_tubes.lua
+++ b/routing_tubes.lua
@@ -101,7 +101,7 @@ if pipeworks.enable_one_way_tube then
 				return {velocity}
 			end,
 			can_insert = function(pos, node, stack, direction)
-				local dir = minetest.facedir_to_right_dir(node.param2)
+				local dir = pipeworks.facedir_to_right_dir(node.param2)
 				return vector.equals(dir, direction)
 			end,
 			priority = 75 -- Higher than normal tubes, but lower than receivers
diff --git a/sorting_tubes.lua b/sorting_tubes.lua
index edaa24a..0d6ec2a 100644
--- a/sorting_tubes.lua
+++ b/sorting_tubes.lua
@@ -1,3 +1,5 @@
+local fs_helpers = pipeworks.fs_helpers
+
 if pipeworks.enable_mese_tube then
 	local function update_formspec(pos)
 		local meta = minetest.get_meta(pos)
diff --git a/tube_registration.lua b/tube_registration.lua
index c926216..c720755 100644
--- a/tube_registration.lua
+++ b/tube_registration.lua
@@ -44,7 +44,7 @@ local register_one_tube = function(name, tname, dropname, desc, plain, noctrs, e
 	end
 	
 	for _, v in ipairs(connects) do
-		table.extend(outboxes, pipeworks.tube_boxes[v])
+		pipeworks.table_extend(outboxes, pipeworks.tube_boxes[v])
 		table.insert(outsel, pipeworks.tube_selectboxes[v])
 		outimgs[vti[v]] = noctrs[v]
 	end
@@ -127,7 +127,7 @@ local register_one_tube = function(name, tname, dropname, desc, plain, noctrs, e
 				nodedef.tube[key] = val
 			end
 		else
-			nodedef[key] = table.recursive_replace(value, "#id", tname)
+			nodedef[key] = pipeworks.table_recursive_replace(value, "#id", tname)
 		end
 	end