Fixes #9311, Fixes destroyed pipes still being in pipe vision, Pipe vision now appears above darkness.

code/ATMOSPHERICS/atmospherics.dm

@@ -25,12 +25,7 @@ Pipelines + Other Objects -> Pipe network
 	var/global/list/pipeimages = list()
 	var/datum/pipeline/parent = null
 
-
-/obj/machinery/atmospherics/Destroy()
-	for(var/mob/living/L in src)
-		L.remove_ventcrawl()
-		L.forceMove(get_turf(src))
-	..()
+	var/image/pipe_vision_img = null
 
 
 /obj/machinery/atmospherics/New()
@@ -45,6 +40,13 @@ Pipelines + Other Objects -> Pipe network
 	if (stored)
 		qdel(stored)
 	stored = null
+
+	for(var/mob/living/L in src)
+		L.remove_ventcrawl()
+		L.forceMove(get_turf(src))
+	if(pipe_vision_img)
+		qdel(pipe_vision_img)
+
 	..()
 
 //this is called just after the air controller sets up turfs
@@ -128,6 +130,7 @@ Pipelines + Other Objects -> Pipe network
 		var/turf/T = loc
 		stored.loc = T
 		transfer_fingerprints_to(stored)
+		stored = null
 
 	qdel(src)
 
@@ -200,17 +203,6 @@ Pipelines + Other Objects -> Pipe network
 		else if(target_move.can_crawl_through())
 			if(returnPipenet() != target_move.returnPipenet())
 				user.update_pipe_vision(target_move)
-
-			/*
-			var/list/myPipenets = getAllPipenets()
-			var/list/targetAllPipenets = target_move.getAllPipenets()
-			for(var/datum/pipeline/I in targetAllPipenets)
-				for(var/datum/pipeline/J in myPipenets)
-					if(I != J)
-						update_pipe_vision(target_move)
-						break
-			*/
-
 			user.loc = target_move
 			user.client.eye = target_move  //Byond only updates the eye every tick, This smooths out the movement
 			if(world.time - user.last_played_vent > VENT_SOUND_DELAY)

code/modules/mob/living/ventcrawling.dm

@@ -68,11 +68,14 @@ var/list/ventcrawl_machinery = list(/obj/machinery/atmospherics/unary/vent_pump,
 	var/list/totalMembers = list()
 	totalMembers |= starting_machine.parent.members
 	totalMembers |= starting_machine.parent.other_atmosmch
-	for(var/atom/A in totalMembers)
-		var/image/new_image = image(A, A.loc, dir = A.dir)
-		pipes_shown += new_image
+
+	for(var/obj/machinery/atmospherics/A in totalMembers)
+		if(!A.pipe_vision_img)
+			A.pipe_vision_img = image(A, A.loc, layer = 20, dir = A.dir)
+			//20 for being above darkness
+		pipes_shown |= A.pipe_vision_img
 		if(client)
-			client.images += new_image
+			client.images |= A.pipe_vision_img
 
 
 /mob/living/proc/remove_ventcrawl()