塑料(liao)管(guan)(guan)道(dao)(dao)下游需求廣(guang)泛，主要包括建筑用(yong)的(de)(de)給排(pai)水以(yi)及(ji)(ji)采暖、市(shi)(shi)政建設中的(de)(de)給排(pai)水及(ji)(ji)采暖、農業(ye)給排(pai)水以(yi)及(ji)(ji)灌溉用(yong)管(guan)(guan)、電力通信護套(tao)管(guan)(guan)、工業(ye)排(pai)污管(guan)(guan)、燃(ran)氣管(guan)(guan)道(dao)(dao)等。市(shi)(shi)政及(ji)(ji)建筑給、排(pai)水管(guan)(guan)道(dao)(dao)和農村安(an)全飲用(yong)水管(guan)(guan)道(dao)(dao)是塑料(liao)管(guan)(guan)道(dao)(dao)的(de)(de)主要用(yong)途，其他(ta)領域的(de)(de)應(ying)用(yong)比(bi)例(li)也在不斷提高。近的(de)(de)市(shi)(shi)場(chang)(chang)走(zou)勢表明，建筑用(yong)塑料(liao)管(guan)(guan)道(dao)(dao)市(shi)(shi)場(chang)(chang)需求趨穩甚至有所下降，市(shi)(shi)政建設用(yong)以(yi)及(ji)(ji)特殊用(yong)途管(guan)(guan)道(dao)(dao)的(de)(de)應(ying)用(yong)比(bi)例(li)進(jin)一(yi)步增加(jia)。

PPH偏(pian)心(xin)變徑，pph45度斜三(san)通(tong)(tong)圖(tu)片，PPH風管(guan)變徑，通(tong)(tong)風管(guan)偏(pian)心(xin)大小頭。管(guan)材(cai)低溫落(luo)錘沖(chong)(chong)擊(ji)(ji)試(shi)(shi)(shi)(shi)(shi)驗(yan)(yan)操(cao)作要點(dian)：試(shi)(shi)(shi)(shi)(shi)樣(yang)應在(zai)(zai)表面(mian)(mian)無缺陷、破損(sun)的(de)(de)(de)(de)(de)管(guan)材(cai)上(shang)截取，以免影(ying)響(xiang)結(jie)果的(de)(de)(de)(de)(de)判(pan)定；注意試(shi)(shi)(shi)(shi)(shi)樣(yang)標線的(de)(de)(de)(de)(de)畫法； 狀態(tai)調節后的(de)(de)(de)(de)(de)試(shi)(shi)(shi)(shi)(shi)樣(yang)應盡(jin)快完成(cheng)沖(chong)(chong)擊(ji)(ji)試(shi)(shi)(shi)(shi)(shi)驗(yan)(yan)；? ?如需(xu)試(shi)(shi)(shi)(shi)(shi)驗(yan)(yan)的(de)(de)(de)(de)(de)是(shi)波(bo)紋(wen)(wen)管(guan)或(huo)有加(jia)強筋的(de)(de)(de)(de)(de)管(guan)材(cai)，pph45度斜三(san)通(tong)(tong)，其(qi)在(zai)(zai)0℃狀態(tai)調節的(de)(de)(de)(de)(de)時間(jian)應按管(guan)材(cai)截面(mian)(mian)厚處(chu)壁厚進行(xing)；當(dang)波(bo)紋(wen)(wen)管(guan)或(huo)加(jia)筋管(guan)的(de)(de)(de)(de)(de)波(bo)紋(wen)(wen)間(jian)距或(huo)筋間(jian)距超過管(guan)材(cai)外徑的(de)(de)(de)(de)(de)0.25倍時，要保證被沖(chong)(chong)擊(ji)(ji)點(dian)為波(bo)紋(wen)(wen)或(huo)筋的(de)(de)(de)(de)(de)頂部(bu)；沖(chong)(chong)擊(ji)(ji)次(ci)數(shu)(shu)和(he)試(shi)(shi)(shi)(shi)(shi)樣(yang)數(shu)(shu)的(de)(de)(de)(de)(de)確(que)定。根(gen)據少沖(chong)(chong)擊(ji)(ji)次(ci)數(shu)(shu)和(he)每個(ge)試(shi)(shi)(shi)(shi)(shi)樣(yang)上(shang)的(de)(de)(de)(de)(de)劃線數(shu)(shu)量(liang)就(jiu)可以算出需(xu)要制取的(de)(de)(de)(de)(de)試(shi)(shi)(shi)(shi)(shi)樣(yang)數(shu)(shu)；落(luo)錘沖(chong)(chong)擊(ji)(ji)試(shi)(shi)(shi)(shi)(shi)驗(yan)(yan)機應保證100%的(de)(de)(de)(de)(de)落(luo)錘回跳(tiao)率，pph45度斜三(san)通(tong)(tong)米黃(huang)，避免落(luo)錘對(dui)試(shi)(shi)(shi)(shi)(shi)樣(yang)造成(cheng)二次(ci)沖(chong)(chong)擊(ji)(ji)，影(ying)響(xiang)沖(chong)(chong)擊(ji)(ji)結(jie)果的(de)(de)(de)(de)(de)正確(que)判(pan)定。

公(gong)(gong)稱通(tong)(tong)(tong)(tong)徑(jing)(jing)(jing)是(shi)(shi)管(guan)(guan)路(lu)(lu)系(xi)統中所有管(guan)(guan)路(lu)(lu)附(fu)(fu)件用數字(zi)表示(shi)的尺寸，pph45度(du)斜三通(tong)(tong)(tong)(tong)供(gong)貨商，公(gong)(gong)稱通(tong)(tong)(tong)(tong)徑(jing)(jing)(jing)是(shi)(shi)供(gong)參考用的一(yi)個方便的圓整數，與加(jia)工(gong)尺寸僅呈不嚴格的關系(xi)。公(gong)(gong)稱通(tong)(tong)(tong)(tong)徑(jing)(jing)(jing)用字(zi)母“DN”或(huo)“dn”表示(shi)，后面緊跟一(yi)個數字(zi)標志。如：DN63，表示(shi)鋼管(guan)(guan)囗徑(jing)(jing)(jing)（通(tong)(tong)(tong)(tong)徑(jing)(jing)(jing)，也稱內徑(jing)(jing)(jing)）為(wei)63mm。DN是(shi)(shi)公(gong)(gong)稱通(tong)(tong)(tong)(tong)徑(jing)(jing)(jing)，是(shi)(shi)各(ge)種管(guan)(guan)子與管(guan)(guan)路(lu)(lu)附(fu)(fu)件的通(tong)(tong)(tong)(tong)用口徑(jing)(jing)(jing)。同一(yi)公(gong)(gong)稱通(tong)(tong)(tong)(tong)徑(jing)(jing)(jing)的管(guan)(guan)子與管(guan)(guan)路(lu)(lu)附(fu)(fu)件均能(neng)相互(hu)連接(jie)，具(ju)有互(hu)換性。但它不是(shi)(shi)實際意義上的管(guan)(guan)道內徑(jing)(jing)(jing)，雖然(ran)其數值跟管(guan)(guan)道內徑(jing)(jing)(jing)較為(wei)接(jie)近或(huo)相等(deng)。